170-00-7 - HTHP Filter Press, 175 mL, Double
Contents
1. 0 M WW Diaphragm Repair Kit 143 00 1 143 00 1 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 32 Regulator Maintenance and Trouble Shooting Symptoms Cause Resolution Gas leak at the regulator outlet when Seat leak or creep Repair the the adjusting screw is loosened fully regulator counterclockwise downstream valves are closed regulator case lator the regulator flow open Repair the regulator Gas leak from any pipe thread joint Loose fitting Remove the connec tion Clean the affected surfaces Reapply Teflon tape and tighten Gas leak from relief valve Faulty relief valve replace the valve Seat leak or creep Repair the regulator Inconsistent repeat readings Seat sticking Repair the regulator Bad pressure gauge Replace the gauge Gauge does not return to zero with Gauge has physical damage Re no pressure applied to the regulator place the gauge Creep is an increase in outlet pressure that occurs when pressure escapes even when the valve is closed Regulator seats can be compromised by particles in the process stream which can cause minor imperfections in the sealing surface The high flow and small orifice created during pressure regulation combine to turn a very small particle into a fast projectile This projectile can nick the sealing surface of the seat and cause leaks Filtering particu lates from the pr2. OFITE Dependable Products From People You Trust HTHP Filter Press for Ceramic Disks with 175 mL Double Capped Test Cell and CO Pressuring Assemblies 170 00 7 115 V 170 01 6 230 V Instruction Manual Updated 12 30 2014 Ver 1 2 OFI Testing Equipment Inc 11302 Steeplecrest Dr Houston Texas 77065 U S A Tele 832 320 7300 Fax 713 880 9886 www ofite com Copyright OFITE 2014 Table of IpiigeroliTeii o tT 2 SDecITICatlOllS iasssevtpots ax isis sss iE Ex t E 3 Con ten ts COMPONENTS scs ddisci nx icm verge oes I UO rrt UP EE Ead EUR pee UE EEn 4 Safe e TEE 11 QUICK Star TTE E TTD 19 Operations 22 pr zm Hem 30 Maintenance ooo epp cui R Ea Ex s EAR ES FPE MEE VC vA P UMEN e DCU UE AME 31 IAG TAM eset 35 Warranty and Return Policy eese 36 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com Intro The OFI Testing Equipment OFITE High Temperature High Pressure HTHP Filter Press is designed to evaluate drilling fluids cement slurries fracturing and completion fluids under elevated temperatures and pressures Evaluating fluids under HTHP conditions similar to the downhole environment is of paramount importance Fluid properties must be monitored while under high temperatures and pressures as filtration behavior and wall cake building characteristics of permeable formations change with changing envi
3. left handed thread fitting connection CGA 590 right handed thread fittings are available upon request A dual Nitrogen manifold assembly is used and pressurizes both the top and the bottom or back pressure devices simultaneously or individually as needed Temperature Normally when one experiences a loss of pressure it is not due to a failure of the metal alloy in the cell but rather is a failure of the o ring or elastomer which provides the seal These o ring may deform or melt under elevated temperatures usually over 400 F 204 C causing a pressurization failure of the cell which is often sudden and catastrophic For example if the valve stem o ring suddenly fails then steam at 400 F and under great pressure may shoot outward horizontally in one or several directions A safety shield should always be used when operating any HTHP Filter Press and especially when one is going to extreme temperatures and pressures Above 350 F 176 C All o rings must be replaced after each and every test OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 11 Heating Jacket Turn the thermostat knob on the front of the metal plate to change the tem perature of the heating jacket The thermostat cover is marked from 1 to 10 and each whole number represents a separate temperature Each filter press will heat up a little differently so it is a good idea to mark with a pen directly on the face pl
4. 171 45 1 is available which will directly and accurately measure the fluid temperature inside the cell OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 24 16 While the cell is heating connect the CO pressuring assembly to the inlet valve stem and lock it in place with the retaining pin and lanyard Check that the safety bleeder valve is closed knob tightened clockwise 17 Connect the back pressure receiver to the bottom valve stem and lock it in place with the retaining pin and lanyard Ensure that the safety bleeder valve is closed knob pushed all the way inward and the receiver outlet needle valve is closed knob tightened clockwise N Use caution It is easy to get burned while working in the confined space Important below the heating jacket Safety Pin with Lanyard Safety Pin with Lanyard 171 23 1 171 23 1 _ Pressuring Assembly 1 70 04 Back Pressure Receiver 1 70 06 Valve Stem 170 16 Valve Stem 170 16 Primary Pressure Assembly CO Back Pressure Assembly CO 170 04 170 06 18 Keeping the valve stems closed adjust the top and bottom regulators on the manifold to the recommended back pressure for your test OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 25 The upper and lower limits of the test pressure differential are determined by the test temperature If
5. 10sec collection is cautionary as a fluid with poor filtration control can quickly fill up the receiver b If back pressure raises above 100 PSI reduce the pressure by open ing the ball valve Collect filtrate for a total of 30 minutes maintaining inlet and back desired pressures 18 After 30 minutes close tighten inlet and outlet valve stems to seal off the 19 20 21 22 23 24 25 26 2f cell Turn top and bottom regulator T screws counter clockwise to release pressure Open the outlet valve on the back pressure receiver to collect all the fil trate in the graduate cylinder Open the needle or bleeder valves on both the top and back pressure units Remove the top and bottom retainer pins and remove pressuring units from the cell Drain any residual filtrate collected from the top of the receiver into the graduate cylinder Remove the cell from the heating jacket and allow to cool to room tem perature outlet side down Open Loosen the inlet valve stem to relieve pressure on the cell There should be a noticeable release of pressure Loosen the 6 cap locking screws on the outlet cap Carefully remove the outlet cell cap OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 20 28 Wash the filter cake with gentle stream of water and record thickness to nearest 74 inch 29 Clean and dry filter press jacket cell and
6. understands the assembly and disassembly procedures and also why the order of steps is in place Care should be taken to never use defective parts and that OFITE s temperature pressure and fluid volume limits are strictly adhered to at all times The heating jacket and cell will get very hot during the normal duration of the test so the operator should take care to avoid burns The operator should be careful when attaching and removing pressure manifolds from the heat ing jacket especially the Back Pressure Receiver assembly which involves operating in a small confined space Safety Retainer Pin Always use a Safety Retainer Pin with an attached lanyard and get in the habit of securing the cotter pin to the pin Improper placement of retainer pins in the past have resulted in the pressure manifold separating from the filter press which can cause damage to the equipment Retainer Pin with Lanyard 171 23 1 Safety Retainer Pin with Lanyard The 175 mL HTHP Filter Press No 170 00 3 and 170 01 3 uses Nitrogen as the pressure source for both the inlet and the back pressure Nitrogen is more inert or less chemically reactive than carbon dioxide and therefore it is used extensively in filtration control analysis where chemical reactions tend to occur when subjected to elevated temperatures and pressures A dual Nitrogen manifold is supplied which regulates pressure to both the inlet and outlet ends of the pressure cell A single nitrogen regu
7. 35 170 04 Graduated Cylinder 50 mL x 1 mL Dual Scale Thermometer with Dial 5 Stem 50 500 F 0 250 C Filter Paper 272 6 35 cm Specially Hardened for Filter Presses 6 Adjustable Wrench CO Pressurize Unit 8143 02 10 CO Puncture Head Assembly 4143 02 12 Puncture Pin 143 02 13 O ring 143 02 14 O ring 143 03 Barrel for CO Cartridge 170 08 Regulator 170 20 Manifold Block 170 32 Vs X Y amp NPT Male Needle Valve 171 23 1 Safety Pin with Lanyard 171 34 1 500 PSI Gauge 2 4 NPT Bottom 143 00 143 01 170 06 Back Pressure Receiver 15 mL Stainless Steel Tube for CO Regulator Low Pressure 200 PSI Gauge s Bottom Connection 8143 02 10 CO Puncture Head Assembly 4143 02 12 Puncture Pin 143 02 13 O ring 143 02 14 O ring 143 03 143 06 144 11 5170 07 170 28 170 32 171 23 1 Barrel for CO Cartridge Safety Bleeder Valve Ye 90 Street Ell O ring Receiver Body Ya x Vs NPT Male Needle Valve Safety Pin with Lanyard 170 46 Double Ended Test Cell for Ceramic Disks 2000 PSI 170 13 3 O ring for Test Cell Viton Fluorocarbon FKM Qty 4 5170 16 8170 17 11170 26 1 5170 27 5170 47 170 69 4170 72 170 77 1 171 21 Valve Stem Qty 2 Valve Stem O ring Qty 4 Hardened Locking Screw Qty 12 757 Allen Wrench Cell Body for Ceramic Disks 175 mL Double Capped End Cap for Ceramic Disks Scribed 2 500 PSI Spacer for Filter Paper 4 3
8. Note probably be necessary to replace the o rings If the cap locking screw seats are oval shaped and no longer round there is a possibility of stress failure and the cap should be re Important placed Cap Locking Cell Cap Scribed Screws 170 26 1 170 69 Valve Stem Cell Cap 170 16 with Screen 171 21 Valve Stem O ring Cell Cap O ring 170 17 1 70 13 3 3 Prepare the sample according to API specifications Stir the test sample for 10 minutes with a high speed mixer 4 Install the inlet cell cap into the inlet end of the cell body Line up the ar rows on the cap and cell body and tighten the cap locking screws initially tightening every other screw After tightening the cap locking screws run your fingers around the cell body to ensure that all of the screws are tight and none are protruding from the wall OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 22 5 Place two o rings in the o ring grooves on each valve stem Screw one valve stem into the cell cap on the inlet side of the cell Tighten the valve stem completely To increase the life of the valve stem and cap apply a thin layer of high temperature thread lubricant 165 44 to the conical face o ring on the pointed end of the valve stem 6 Invert the cell body and carefully pour the sample into the cell leaving the appropriate amount of void space as indicated by the chart below Be careful
9. To release trapped pressure X Safety Clamp 170 92 Set Screw Cell Assemblies Only Safety Shield 171 06 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com T High Pressure Nitrogen Assy Thermocouple Assembly 4171 31 171 45 1 Direct temperature measurement Of the fluid Inside the Cell Stand for HTHP Cell Assembly 171 190 028 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 8 Ceramic Disk Filters Porous ceramic filters have many applications but in the oil field they are used as a replacement for filter paper in the HTHP Filter Press Available in a range of pore throat sizes and permeabilities ceramic filters enable the oper ator to perform filtration tests under conditions similar to the formations being drilled This is a big advantage over the standard paper filters Also ceramic filters unlike paper have depth usually 74 so core analysis invasion and return permeability studies may all be performed Bridging characteristics of drilling and drill in fluids may be analyzed Porous ceramics consists of closely sized particles bonded together which result in a uniform permeable material that forms a tortuous path for fluid flow The most common materials are Alumina and Silica but there is an almost unlimited variety of materials and shapes available HTHP filtration cell bodi
10. not to spill fluid on the o ring inside the cell Temperature Pressure Volume Recommendations Be Careful Not to spill fluid on the O ring Groove inside the Cell Fluid Volume 138 mL 6 mL 15 mL Void Space in a 1 500 PSI rated cell body 7 Place an o ring in the cell and another on the outlet cell cap they are the same sized o ring To facilitate removing the cell cap at the end of the test lightly apply a coat of stopcock grease 153 55 to the cell cap o ring 8 Inspect the cap locking screws If the cap locking screw are no longer sharply pointed there is a possibility of stress failure and the screw s should be replaced 9 Inspect the cap locking screw seats in the cell cap indentures in the cell cap If the cap locking screw seats are no longer round there is a pos sibility of stress failure and the cap should be replaced 10 Place a pre soaked ceramic disk filter on top of the cell o ring and gently push it downward so it contacts the o ring OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 23 11 Make sure the arrow on the cell cap lines up with the arrow on the cell body and slowly push the cell cap into the cell Ensure that the o ring does not slip out of the o ring groove during insertion of the cell cap Not attaching or tightening the valve stem makes this operation easier Arrows 12 Use the Allen wrench to tighten the six lockin
11. out the ceramic disk c With the outlet cell cap removed re attach the Inlet CO pressure as sembly and apply enough pressure to extrude the ceramic disk 36 Discard the fluid inside the cell unless it is required for further testing Save the filter cake for analysis 37 Clean and dry the apparatus thoroughly after each use 38 Inspect all o rings for deformities and replace as necessary Replace all o rings if the test was conducted above 350 F v After each test the HTHP filter press should be left so that a new test may be Tip performed with no clean up and a minimum of assembly OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 29 Data Filtrate Volume The HTHP filter press has a filtration area of 3 55 in 22 9 cm This is half the area of a standard filtration test which is 7 1 in 45 8 cm To compare the results of this test to a standard filtration test double the total filtrate vol ume collected for the full 30 minutes Vs 7 2 V4 Spurt Loss Optional Spurt Loss is the amount of filtrate collected before the filter cake has had a chance to form and is expressed in millimeters To calculate the spurt loss use the following equation V 2 ur Vao V 2 2V_ V30 4V 5 2V 59 Where V Standard Filtrate Volume mL V Spurt Loss V_ Filtrate volume in milliliters collected after 7 5 minutes doubled Va Filtrate
12. test temperature within x 5 F 43 C If the back pressure rises during the test cautiously reduce the pressure by opening the needle valve on the receiver and drawing off some of the filtrate into the graduated cylinder After 30 minutes the test is over Immediately close tighten the top and bottom valve stems to seal off the cell Allow a minimum of 5 minutes for the filtrate in the receiver to cool to avoid vaporizing Collect filtrate by opening the needle valve on the re ceiver and leave it open until fluid ceases to evacuate the valve Close Tighten the needle valve on the receiver Turn the regulator T screws on both the inlet and back pressure receiver counterclockwise until the T screw feels loose This will stop the flow of pressurized gas Release the pressure from the Inlet pressuring unit to the cell by opening the needle valve turn counterclockwise Release the pressure from the back bottom pressuring unit to the receiv er body by pulling outward on the knob which will open the bleeder valve Remove the top and bottom retaining pins and remove the two pressure assemblies Take care to avoid touching the hot heating jacket especially when re moving the back pressure receiver Open the needle valve and drain any residual filtrate collected in the re ceiver into the graduated cylinder Record the total amount of filtrate collected in the graduate cylinder by reading from the bottom of the meniscus cur
13. the test is conducted at a temperature less than the boiling point of water then no back pressure will be required and filtrate may be collected directly into a graduated cylinder If however tests are conducted above the boiling point of water then as this tem perature exceeds 212 F 100 C the back pressure must be increased above the vapor pressure at the test temperature in order to prevent vaporization of the filtrate If running a standard API test the 500 PSI dif ferential pressure must be maintained so the top pressure will have to be increased 500 PSI over whatever the back pressure is The table below shows the back pressures recommended for various test temperatures Recommended Minimum Back Pressure Test mers Minimum Back Pressure PS 06 kPa 4 7 E 690 30 l 690 67 350 177 B O 2T 422 kPa 207 462 992 acm 1 704 n zx NO iN Ql O a EN OIO OIO 19 Open loosen the Inlet valve stem 1 2 turn to pressurize the sample Maintain this pressure on the fluid until the temperature has stabilized This will prevent vaporization of the test solution if heating above the boil ing point of the liquid 20 After the one hour heat up time increase the pressure on the inlet pres sure unit to 500 PSI 3 448 kPa more than the back pressure 21 Open loosen the bottom valve stem 75 turn to initiate filtration as soon as possibl
14. volume in milliliters collected after 30 minutes doubled Filter Cake Wash the filter cake on the paper with a gentle stream of water Measure and report the thickness of the filter cake to the nearest 7 0 8 mm A ruler with the zero mark at the very edge of the ruler is useful here Cake descriptions may be subjective and such notations such as hard soft rubbery and fine etc convey adequate information on cake quality OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 30 Maintenance 1 Aaa cell assemblies should periodically be checked a Cell Corrosion Stress cracking or pitting b Cylinder Shear Raised areas above the cell set screw holes c Elongated set screw holes in the cell bodies d End Cap Compression Elongated set screw de pressions on cell caps e Set screws which are no longer tapered on the inside f Elastomers Check for flat spotting and melting g Valve stems should be sharply pointed and not dull on outlet side 2 Always thoroughly clean up after each tests a Replace all elastomers if previous test was in excess of 300 F 149 C b Clean out and blow dry if possible the back pressure receiver c Cell body must be completely cleaned with special attention to the o ring groove 3 Periodically check for leaks a Cell Assembly Immerse sealed pressurized cell assembly in a sink filled with water l
15. 16 Stainless Steel O ring 140 Viton 75D for Spacer Qty 2 Cell Cap with 60 mesh Screen 2 000 PSI 170 00 1 Heating Jacket 115V 170 01 1 Heating Jacket 230V 164 32 165 40 3 170 05 5170 10 5170 11 5170 15 1170 21 1170 25 1 70 30 1170 44 4171 32 171 82 Optional 143 05 152 00 152 01 155 20 170 03 170 13 170 13 5 170 33 170 40 170 91 170 92 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com OR Male Connector for Power Cable 230 Volt Power Cable For 170 01 1 230V Only Thermostat Thermostat Pilot Light Heating Element 115V 200W Base Stand Support Rod Aluminum Well Stainless Steel Thermostat Cover Rubber Foot 72 Qty 4 Midget Knob 8 Power Cord with Male Plug 8 16 3 SJ Round For 170 00 1 115V Only EZ Puncture CO Bulbs 8 Gram UN 1013 Package of 10 Hamilton Beach Mixer With Container Armature For Model 936 H B Mixer 115 Volt Timer 60 Min Interval Stainless Steel Carrying Case O ring for Test Cell Buna For tests below 300 F O ring for Test Cell Ethylene propylene For temperatures up to 400 F 204 4 C Water based fluids only HTHP Cell Cap Puller Test Cell Removal and Carrying Tool HTHP Pressure Relief Tool Safety Clamp for HTHP Fluid Loss Cells Optional 170 00 SP Spare parts for 170 00 175 mL HTHP Filter Press Part Number 140 60 01 143 00 1 143 01
16. Gauge 200 psi 7s Bottom Connection 4143 02 13 4143 02 14 4143 05 4143 07 4153 14 4154 10 170 13 3 170 16 170 17 O ring for Valve Stem Viton 75D 4470 19 Filter Paper 2 72 6 35 cm hardened for Filter Press 100 box 170 26 1 Locking Cap Screw Hardened Alloy Steel 12 170 27 Allen Wrench 171 23 1 Safety Pin with Lanyard d Spare parts listings are intended to be used as a reference for future pur chases Everyone s consumable requirements will be different and replace ment quantities needed will depend upon the number of test performed on a Note daily and or weekly basis OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 6 Optional Items for HTHP Filtration Testing The items listed below are not included in the HTHP Filter Press but they are items that will enable the technician to perform a more uniform and reproduc ible test while maintaining a high degree of safety As optional items the us age is not compulsory but consideration should be given to these items when running tests at elevated temperatures and pressures Some of the items will be used only on cell assemblies using set screws as fasteners while others should be implemented when operating all filtration equipment Interval Timer 60 minute Cell Cap Removal Tool 155 20 170 33 Set Screw Cell Assemblies Only Cell Carrying Tool 170 40 HTHP Ecc Tool
17. Set Screws 0 75 inch thick Cell Cap 2 000 PSI Set Screws 0 94 inch thick Locking Set Screws Locking set screws should have sharp points on the end If the tip becomes worn and flattened pressure may be lost in the cell or the cell cap may be come damaged Any set screw cell cap that has elongated set screw holes should be discarded as they are unsafe Locking Screw for HTHP Cell 170 69 Cell Cap 2 000 psi Caps 2 000 PSI 90 Cone Point HTHP Filter Press Scribed For 170 26 1 Ceramic Filters Note Round Set Screw Holes O ring Seals The choice of o rings or elastomers as they are commonly called is very important in any high temperature high pressure environment OFITE uses Viton o rings a copolymer of Vinylidene which are less pliable than some Buna rings which may be encountered from other manufacturers but they withstand the higher temperatures better than the Buna rings The maximum temperature for the Viton o rings is 400 F 204 C OFITE suggests that all o rings cell caps cell bodies and valve stem are changed each time after running a test of 350 F 176 C or above OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 14 Fluid Expansion Space Cells should never be filled completely with fluid Always leave some room for the fluid to expand under temperature This keeps the cell caps from be coming overstressed and possibly leading to a cell pressure f
18. X 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 9 specifications as outlined in the chart All results and all orders should be based upon the information under the New Mercury column in the chart All ceramic disks must be soaked in the base fluid being tested for at least 30 N minutes prior to usage Failure to do so will result in premature and exces sive plugging of the pores within the disks giving erroneous results Labora tories often will perpetually soak disks in the base fluid Mean Pore roal um mean emend Darcy Pari Number Old Data Old Data rs no Hg i mE Hg Air 4470 55 4470 55 775mD 775mD 400mD 400mD 170 53 2 D T DR I 850mD 750 mD 170 53 3 Important 17051 49 20 8D 5D 170531 85 60 20D 20D 70534 1220 90 40D 10D 170535 150 180D 170536 19 1 Micron um 1 1 000 mm or 1 25 400 inch OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 10 Safety Pressure and Temperature Considerations Do not use or reconfigure this equipment in a manner not specified in this manual Pressure There are two reasons for operating at elevated pressures when performing a filtration analysis 1 To test fluids at temperatures above the boiling point the vessel must be pressurized which in turn elevates the
19. ailure or even a loss of the cell cap completely Periodically check all gauges to ensure the proper pressures are in the cell as the pressure often increases or decreases depending upon the test proce dure and conditions API Recommended Void Space Fluid Temperature Void Space Fluid Volume Water based drilling fluid 300 F 0 6 1 5 cm 138 mL Water based drilling fluid gt 300 F 1 5 4 0 cm 6 mL Oil based drilling fluid lt 350 F 176 C 1 2 5 cm 15 mL Oil based drilling fluid gt 350 F 176 C _ St Recommennod Void Space in a 1 500 PSI rated cell body OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 15 The OFI 175 mL HTHP Filter Press uses two regulators as standard equip ment Both may be operated with Carbon Dioxide CO or Nitrogen N gas 1 Concoa Regulator 8051140 00 1 Top or Main Pressure a Maximum Inlet Pressure 3 000 PSI b NPT Connections c Single stage regulator Regulator Safety 1 Never subject the regulator to inlet pressure greater than its rated inlet pressure as shown on the regulator body Do not allow oil oil bearing materials grease or other combustibles to contaminate the inside or outside of the regulator especially where Oxy gen is in use To minimize heat effects avoid the use of piping or tubing between the pressurized cylinder and the regulator If unavoidable it should be as sh
20. ate of the thermostat cover the temperature which cor responds with each number The actual temperature of the heating jacket is measured with a stem thermometer and then the thermometer is placed into the cell body The heating jacket will get very hot during the test so be careful not to touch the outside of the jacket at any time during the heat up period or the test It is especially easy to get burned when installing or removing the Back Pressure Receiver as the technician is working in a very confined space The power cord is supplied for either 115 Volts or 230 Volts and due to the various types of plug connectors around the world it may be necessary to change the plug on the end of the power cord The power cable is 8 feet in length and the heating jacket should be placed no farther than 8 feet from the appropriate electrical outlet The heat up time will vary from one instrument to the next and the pilot light will turn on when the set temperature has been reached The temperature of the fluid inside the cell however will not be at the set tem perature so always allow one hour of heating time for the fluid after the cell has been fully inserted into the heating jacket OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 12 The HTHP Filter Press is a very safe instrument to operate as long as the in structions are strictly followed It is imperative that the technician thoroughly
21. e Start the filtration test at this time Set a timer to 30 minutes If spurt loss is being measured set a second timer to 7 5 minutes Closely monitor the pressure gauges If at any time during the test the pressure inside the cell rises above the setpoint carefully open the needle valve on the top pressure assembly just enough to bleed off the excess pressure Then close the valve If the cell pressure decreases due to collection of filtrate increase the pressure with the inlet regulator 22 To collect filtrate carefully open the needle valve on the bottom of the back pressure receiver while holding a graduated cylinder to the valve port Close the valve immediately after the outlet pressure just begins to avoid having to replace a CO bulb in the middle of the test OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 26 23 24 25 26 2f 28 29 Important 30 31 32 Important Collect filtrate at 10 seconds 1 minute 7 5 minute and 30 minute inter vals The initial 10 second collection is precautionary in nature as a fluid with little filtration properties may fill up the 15 mL receiver tube almost immediately potentially damaging the regulator Do not record the 10 second volume collected but do record the volume collected at the other time intervals Timers pre set to 7 5 minutes and 30 minutes are helpful While collecting filtrate maintain the
22. es must be recessed and extra 72 on the outlet side of the cell body in order to accommodate the ceramic disk A 74 spacer is provided for usage of filter paper if desired Different sized ceramic disks to simulate cores and an assortment of other pore throat porosities permeabilities are available on a special order bases These ceramic filters are classified by mean pore throat sizes and or units of permeability Mean pore throat is the average minimum pore diameter through the disk and it is measured in microns or thousandths of a millimeter Permeability is measure of the volume flow of fluids through a porous or semi porous media when subjected to a differential pressure It is mathematically equated by Darcy s Permeability Law Previously mean pore throat size and permeability were roughly determined using air permeameter technology Recent research funded by the American Petroleum Institute API used the latest Mercury Injection Capillary pressure technology to determine these characteristics This new procedure found that the manufacturing process does not allow for absolute consistency between ceramic batches but after numerous tests over several years the final results was statistically pretty close Even though the ceramic filters are the same filters that have been provided for years the new API method for determining mean pore throat size and permeability have resulted in new and improved OFITE 11302 Steeplecrest Dr Houston T
23. express or implied and the warranties provided in this clause shall be exclusive of any other warranties including ANY IMPLIED OR STATUTORY WARRANTIES OF FITNESS FOR PURPOSE MERCHANTABILITY AND OTHER STATUTORY REM EDIES WHICH ARE WAIVED This limited warranty does not cover any losses or damages that occur as a result of Improper installation or maintenance of the products e Misuse Neglect e Adjustment by non authorized sources e Improper environment e Excessive or inadequate heating or air conditioning or electrical power failures surges or other irregularities e Equipment products or material not manufactured by OFITE e Firmware or hardware that have been modified or altered by a third party e Consumable parts bearings accessories etc Returns and Repairs Items being returned must be carefully packaged to prevent damage in shipment and insured against pos sible damage or loss OFITE will not be responsible for equipment damaged due to insufficient packaging Any non defective items returned to OFITE within ninety 90 days of invoice are subject to a 15 restock ing fee Items returned must be received by OFITE in original condition for it to be accepted Reagents and special order items will not be accepted for return or refund OFITE employs experienced personnel to service and repair equipment manufactured by us as well as other companies To help expedite the repair process please include a repair form w
24. g set screws into the cell and secure the cell cap in place Use hand touch to make sure that all of the set screws are completely tightened The cell may become permanently stuck inside the heating jacket if one or more set screws are left protrud ing from the cell 13 Install a valve stem into the cell cap and tighten completely with a wrench 14 Hold the valve stem and place the cell in the heating jacket with the outlet filler side of the cell pointed down Using the wrench rotate the cell inside the heating jacket so that the pin in the bottom of the heating well seats into the hole in the bottom of the test cell This will anchor the cell in the well and prevent it from rotating as the valve stems are opened and closed Check the inlet and outlet valve stems with a wrench to ensure they are tight 15 Move the thermometer from the heating jacket to the hole in the test cell The heating time of the sample should take exactly one hour Set a timer to 60 minutes and begin the test at this time Do not initiate filtration when the thermometer first indicates the desired temperature has been reached The fluid inside the cell may not have yet reached the proper temperature An api funded project found that for 8 most fluids it usually takes upwards of an hour for the fluid inside the cell to reach the target temperature If accurate temperature measurement is Note required during the heating portion of the test a thermocouple assembly
25. ith all equipment sent to OFITE for repair Be sure to include your name company name phone number email address detailed description of work to be done purchase order number and a shipping address for returning the equipment All repairs performed as repair as needed are subject to the ninety 90 day limited warranty All Certified Repairs are subject to the twelve 12 month limited warranty Returns and potential warranty repairs require a Return Material Authorization RMA number An RMA form is available from your sales or service representative Please ship all equipment with the RMA number for returns or warranty repairs to the following address OFI Testing Equipment Inc Attn Repair Department 11302 Steeplecrest Dr Houston TX 77065 USA OFITE also offers competitive service contracts for repairing and or maintaining your lab equipment in cluding equipment from other manufacturers For more information about our technical support and repair services please contact techservice ofite com OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 36
26. lator is available if dual pressurization is not required Nitrous Oxide NO is available in the same sized bulbs as CO but should never be used as a pressure source for HTHP Filtration Under high temperatures and pressures nitrous oxide can deto nate in the presence of grease oil or carbonaceous material OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 13 Working Pressure OFITE clearly stamps the working pressure of the cell assembly along with the assembly serial number on each cell body and cell cap These pressure limits should never be exceeded on the pressure manifolds and fluid vol umes inside the cell should strictly comply with instructions see page 13 However in the past HTHP cells and caps from various manufacturers were often not stamped or in some cases very old cell assemblies were stamped 2500 Cell assemblies with set screw secured caps should never be taken to 2 500 PSI under any temperature or condition The OFITE 175 mL HTHP Filter Press 2170 00 and 170 01 are furnished with a standard 1500 PSI working pressure cell assembly OFITE also manufactures HTHP cells with a 2 000 PSI working pressure Please note Important the 1 500 PSI and 2 000 PSI cell assemblies do not have parts that are interchangeable so when ordering replacement cell caps for instance know which working pressure rated cell assembly you are ordering for Cell Cap 1 500 PSI
27. ll Assembly 170 16 170 46 Heating Jacket 170 00 1 170 01 1 Back Pressure Receiver 170 06 Base 170 15 Regulator poem 2170 08 7 i Retaining Pin us Bs i E T Screw With Lanyard _ Gauge 200 psi 171 23 1 T Screw 143 01 Bs Barrel for CO Bulb ie 143 03 N ED m ZA a gi i i3 d Hl Receiver IIH Body 170 28 ARSAL Regulator 143 00 Needle Valve 170 32 Retaining Pin 171 23 1 With Lanyard ra m b x Barrel for CO Bulb Manifold 4143 03 Block 171 34 Needle Valve 170 32 CO Pressuring Assembly Back Pressure Receiver 170 04 170 06 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 18 Quick Sta rt 1 Pre heat the heating jacket to 10 F 6 C above the desired test temperature a Thermometer in jacket b Thermostat light turns on when target temperature is reached 2 O rings a Inspect o rings and install in cell body cell caps and on valve stems b Coat all cell o rings with Silicone Stopcock Grease 153 55 3 Cell Assembly a Install inlet cell cap being sure the arrows on lid and cell body align b Setscrews Ensure the set screw points are sharp Tighten the set screws completely c Install the valve stem on the inlet side of cell body 4 nvert cell and pour sample into the cell leaving at least 0 6 inches 1 5 cm void s
28. ll be free from liens and defects in title and shall conform in all respects to the terms of the sales order and the specifications applicable to the products All products shall be furnished subject to OFITE s standard manufacturing variations and practices Unless the warranty period is otherwise extended in writing the following warranty shall apply if at any time prior to twelve 12 months from the date of invoice the products or any part thereof do not conform to these warranties or to the specifications applicable thereto and OFITE is so notified in writing upon discovery OFITE shall promptly repair or replace the defective products Notwithstanding the fore going OFITE s warranty obligations shall not extend to any use by the buyer of the products in conditions more severe than OFITE s recommendations nor to any defects which were visually observable by the buyer but which are not promptly brought to OFITE s attention In the event that the buyer has purchased installation and commissioning services on applicable products the above warranty shall extend for an additional period of twelve 12 months from the date of the original warranty expiration for such products In the event that OFITE is requested to provide customized research and development for the buyer OFITE shall use its best efforts but makes no guarantees to the buyer that any products will be provided OFITE makes no other warranties or guarantees to the buyer either
29. ocess stream should be a high priority and a small filter can reduce the potential for creep and increase the life expectancy and accuracy of the regulator OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 33 To replace the Seat Assembly 1 10 11 12 13 Unscrew the spring case housing cover This may require a strap wrench Remove the spring case Remove the rubber diaphragm 143 00 1 from inside the spring case Remove the thrust plate 143 00 7 Using a wrench loosen and remove the brass colored retainer The thrust pin and seat are now exposed and can be removed from the base Replace the spring repair kit Replace the seat holder repair kit Replace the thrust pin and the Teflon seat which can be attached be fore insertion repair kit Replace the brass retainer and tighten with a wrench Replace the thrust plate with the curved edges downward Place a new rubber diaphragm inside the Soring case Replace the spring case and hand tighten Power Cord Maintenance a Check power cord for Insulation wear and loose connections near the heating jacket and plug b The heating jacket should be placed no farther than the distance of the power cord from an electrical outlet c The Power Cord should be kept away from the hot surface of the heating jacket while in use 8 Any customer installed wiring power cords or electrical connect
30. on Natural formation cores may also be used of differing sizes Different screens may be used or slotted disks of varying sizes are frequently used for lost circulation materials studies Both the 175 mL and the 500 mL heating jackets are capable of reach ing 400 F 204 C but lower fluid volumes due to fluid expansion at higher temperatures limit the 175 mL units to a useful working temperature of 300 F 149 C for water based fluids and 350 F 176 C for non aqueous fluids Anyone running tests above 350 F 177 C must substitute a complete set of o rings after each and every test OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 2 Specifications OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com oize Weight Shipping Size Shipping Weight Maximum Temperature Maximum Pressure Cell Maximum Pressure Receiver Pressure Source Test Cell Capacity Power Requirement Heater 7 5 x 11 x 23 5 19 1 x 27 9 x 59 7 cm 27 lbs 12 3 kg 20 x 13 x 13 51 x 33 x 33 cm 33 Ibs 15 kg 400 F 204 C 1 500 PSI 10 343 kPa 750 PSI 5 1 MPa Two CO Pressuring Assemblies 175 mL 170 00 7 115V 170 01 6 230V 50 60 Hz 400 Watt Components OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 4153 14 154 10 5170 19 1170
31. ook for bubbles b Top Pressure Assembly Immerse regulator valves and sealed cell assembly in a sink full of water and look for bubbles Hold assembly by the gauge and do not let the gauge get wet c Back Pressure Receiver Similar to B Hold assembly by the gauge and do not allow it to get wet OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 31 4 Regulator and Manifold Maintenance a Replace both o rings on the puncture pin 143 02 13 and 143 02 14 at least once a year 142 10 CO Pressuring Assembly 200 PSI Gauge Safety Bleeder 8143 01 Regulator 8142 00 Vaive 143 06 O ring O ring 8143 02 14 143 02 13 ug Puncture Pin Holder Assembly 143 02 11 CO Puncture Head Assembly 143 02 10 CO Cartridge 143 05 Complete CO Puncturing Head Assembly 143 02 10 Barrel for CO Cartridge 143 03 CO Puncture Head Assembly 143 02 10 b If the regulator loses pressure or steadily increases in pressure re place the seat assembly and diaphragm Concoa Repair Kit Part 2143 07 Normally the Concoa regulator is supplied with the 175 mL models The Large High Pressure Concoa Regulator 805 1140 and the smaller Concoa Regulator 805 1179 both take the same Regulator Note Repair Kit Always replace order separately the rubber diaphragm 143 00 1 which is not supplied with the 2143 07 kit
32. ors will Void All Warranties Note Storage Space a Consumables and tools should all be kept in one dedicated place b Components such as manifold assemblies should be kept in a similar dedicated place OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 34 Diagram High Pressure Regulator 22170 08 Needle Valve 170 32 Valve Stem 170 16 Valve Stem O ring 170 17 Heating Jacket 1 70 00 1 170 01 1 Cell Cap Scribed 170 69 Regulator 143 00 200 PSI Gauge 143 01 CO Puncture Head Assembly 143 02 10 Barrel for CO Bulb 143 03 Safety Bleeder Valve 143 06 B E V I tel Q T Q 1 500 PSI Gauge 171 34 Barrel for CO Bulb 143 03 Manifold Block 170 20 Safety Pin 171 23 1 With Lanyard p LL J QI EN Cell Cap with Screen 171 21 Test Cell Body 3 170 45 3 Test Cell O ring 1 70 13 3 Locking Screw 170 26 1 I Valve Stem l q 170 16 Safety Pin 171 23 1 With Lanyard Receiver Body 170 28 Support Rod 170 71 Receiver O ring 170 07 Not Shown Needle Valve 74 90 Street Ell 4170 32 4144 11 Not Shown OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 35 Warranty and Return Policy Warranty OFI Testing Equipment Inc OFITE warrants that the products sha
33. ort as practical and equipped with a shutoff valve located just before the regulator The 8051140 regulator has been internally cleaned for Oxygen but it is not recommended to pressurize HTHP Filtration tests with Oxygen due to its potentially explosive nature Never pressurize a regulator that has loose or damaged parts or is in questionable condition Never loosen a connection or attempt to remove a part until gas pressure has been relieved Before transporting pressurized cylinders that are not secured on a cart designed for such transport remove all regulators and recap the cylinders Check the regulator and all connections for leaks after installation and pe riodically thereafter Also check for leaks after any service in which parts or connections were loosened Brush with an approved leak detection solution and bubbles should indicate a leakage An appropriately sized pressure relief device downstream of the regulator should be installed in your system to prevent damage to equipment and or injury to personnel should an internal failure of the regulator occur Do not purge oxidizing or flammable gases in the presence of flame lit cigarettes or other sources of ignition or towards people OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 16 HTHP Cell Assembly The 170 46 HTHP cell assembly can handle maximum standard filtration tests at elevated temperatures and pressure
34. pace to allow for heat expansion a Do not spill fluid on the o ring groove 5 Place a pre soaked ceramic filter of your choice on top of the o ring 6 Push the outlet cell cap into the cell making sure the arrows align a Valve stem initially open to facilitate insertion b Tighten set screws C Close tighten the outlet valve stem Both valve stems are closed and the cell is sealed 7 Invert and place the cell inside the heating jacket and rotate the cell until it seats Hour heat up time begins now 8 Transfer the thermometer from the heating jacket to the cell body 9 Connect the inlet top pressure assembly and lock in place with the re taining pin 10 Connect the back pressure assembly and lock in place with the retaining pin 11 Puncture CO bulbs Adjust inlet back pressure regulators to desired back pressure OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 19 12 13 14 15 16 17 Open loosen the inlet top valve stem a 7 turn to pressurize the cell Heat for one hour The thermometer should register at the target tem perature within an hour Total heat up time should not to exceed 1 hour After the hour heat up time increase pressure on inlet top pressure unit to 500 PSI over the back pressure Open bottom valve stem to initiate filtration Collect and note filtrate amount at 10 seconds 1 0 7 5 and 30 0 minutes a
35. pressure assemblies thoroughly 30 Inspect and replace any or all o rings All if test run gt 300 F 149 C 31 Report Double the filtrate volume Correct to the API standard of 7 1 in Spurt Loss volume is Optional OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 21 Opera tion 1 Connect the heating well power cord to an appropriate power source Place a dial type metal thermometer into the well in the heating jacket and preheat to 10 F 6 C above the desired test temperature A pilot light will come on when the heating jacket is at the desired temperature as select ed by the thermostat control knob 2 Be sure all of the o rings are in good working condition pliable with no nicks or cuts etc and are not damaged during the assembly proce dures Place a thin film of silicone grease on all o rings Place an o ring into one end of the test cell and place the screen on top of it with the flat side facing down Slowly push one of the cell caps into the cell making sure the arrow on the cap lines up with the arrow on the cell body Tight en the locking screws with the supplied Allen wrench Screw a valve stem into the cell cap and tighten it completely Standard Buna N o rings 2170 13 should be used only for tests up to 9 300 F 149 C For tests over 300 F 149 C use Viton o rings 170 13 3 After tests that come close to the maximum temperature it will
36. r time It may be necessary to return the cell to the heating jacket and use the stop pin in order to loosen the valve stem 9 Pressure should NOT be relieved from the cell by opening the outlet valve stem as the filter cake may seal off the cell Note Safe Release of Pressure from a Cell OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 28 A good indication that pressure is trapped inside the cell body occurs if the set screws are unusually difficult to loosen especially the 4th 5th and 6th ones and the cell cap begins to extrude out of the cell body as N the set screws are progressively loosened To relieve any trapped pres sure an OFITE Pressure Relief Tool 2170 91 may be inserted through the inlet cell cap hole which will relieve any trapped pressure inside the cell Ensure this function is performed on the inlet side of the cell as the filter cake may seal off the outlet end of the cell Important 34 Invert the cell and loosen but do not remove the six cap locking screws and separate the cap from the cell with a slight rocking motion The OFITE Cell Cap Removal Tool 2170 33 makes it easy to remove tight difficult to remove cell caps 35 There are several ways to remove the filter along with the filter cake a Hold the cell and invert it over a sink and let the weight of the fluid inside the cell push the disk out b Aspatula might help in prying
37. ronments These characteristics are affected by the shape type and quantities of solids present in the fluid and their physical and electro chemical interactions all of which are affected by changing temperatures and pressures OFITE manufactures and provides HTHP filtration units in two basic sizes 175 mL and 500 mL capacities Both are used extensively throughout the world and in all environments but in general the 175 mL units is designed for field portability while the larger 500 mL units are designed for laboratory us age at higher temperatures and pressures All OFITE Filtration devices fully conform to American Petroleum Institute API specifications A complete HTHP Filter Press consists of a controlled pressure source usu ally Nitrogen pressurization or Carbon Dioxide bulbs for the 175 mL units Top and bottom pressure manifolds are provided to simulate the differential pressures found in a down hole environment and to prevent evaporation of the base fluid if exceeding the boiling point of that fluid The test cells are provided in a variety of assemblies depending upon the type of fluid tested the filter media and the temperatures and pressures desired The test cells are encased inside a heating jacket which is adjustable A variety of filter media are available the most common being the standard API filter paper cement screens and ceramic filters which may be obtained to match the pore throat or permeability of the formati
38. s The maximum pressure rating is 1 500 PSI and the temperature is 400 F 204 C Most tests conducted with the 175 mL capacity filter presses under API standards operate at an inlet pressure of 600 PSI and with temperatures up to 350 F 176 C The cell bodies and cell caps are scribed with serial numbers so that the same cap and same cell bodies are used on each and every test resulting in more reproducible results Additional information includes the part number tem perature rating the alloy and pressure rating of the cell All OFI Testing Equipment HTHP cell assemblies are made of Stainless Steel For very corrosive environments cell assemblies made of Hastelloy C 276 or Inconel are available and recommended It is advantageous to have a double capped cell as the filtration test re moves the liquid phase of the test fluid leaving a relative larger particle count Sometimes this semi fluid will harden inside the cell body and a drill may be necessary to remove the now solid material With a double capped cell sim ply remove both caps and push from one end to remove the contents Cap Locking Cell Cap Scribed Screws 170 26 1 170 69 Valve Stem Cell Cap 170 16 with Screen 171 21 Valve Stem O ring Cell Cap O ring 170 17 1 70 13 3 OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 17 CO Pressuring Assembly 170 04 Valve Stem Ce
39. vapor pressure boiling point so that the fluid remains liquid and does not turn to steam 2 If testing for drilling applications pressurization will more approximate down hole conditions enabling the technician to match both bottom hole temperatures and pressures Important For temperatures less than 200 F 93 C a Back Pressure Receiver is not required as the filtrate will not reach the boiling point However when oper ating above the boiling point of water a suitable Back Pressure Receiver is required otherwise the test fluid will turn to steam and the test is invalidated The standard receiver tube supplied with the 175 mL HTHP Filter Press holds 15 mL of filtrate so it is very important that the receiver outlet ball valve is opened after approximately ten seconds of filtrate collection as a fluid with poor filtration qualities can easily fill the 15 mL receiver tube almost instan taneously If this happens the filtrate hopefully will all be ejected from the safety bleeder valve but if there is too much fluid volume the liquid may end up inside the regulator rendering it useless which will require servicing by a knowledgeable technician Nitrogen is commonly used as a pressure source A small Nitrogen cylinder 170 37 size 21 x 7 Optional provides the pressure source These cyl inders are shipped empty but when filled they may be pressurized to 2 216 PSI 153 Bar They have a standard CGA 580 Compressed Gas Associa tion
40. ve Multiplying the amount in milliliters by 2 Remove the cell from the heating jacket after once again checking that the valve stems are tightly closed An optional Cell Carrying Tool 1 70 40 makes this a simple and safe operation DO NOT remove the heated cell using pliers or an open ended wrench attached to the valve stem This is very dangerous and could cause seri ous damage OFITE 11302 Steeplecrest Dr Houston TX 77065 USA Tel 832 320 7300 Fax 713 880 9886 www ofite com 27 The test cell will still be under approximately 600 PSI 4 140 kPa pres sure To avoid possible serious injury position the cell with the outlet end down and cool it to room temperature before disassembling The cell Important must be below 100 F 38 C Cool for at least one hour at room tempera ture before loosening the cap locking screws 33 Place the cooled cell upright with the outlet side down The optional stand for the HTHP cell assembly 171 190 028 makes a great cell holder This will help preserve the filter cake Open loosen the inlet valve stem to bleed off pressure from the cell body There should be a noticeable release of pressure from the cell Stand for HTHP Cell Assembly 171 190 028 Hold a rag or piece of paper over the valve stem in order to catch any liq uid or solids that might be ejected under pressure from the cell This will help prevent an unsightly residue build up on the ceiling which may occur ove
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