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OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com

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High temperature, high pressure filtration cells are designed to test the seal

-

ing characteristics of drilling fluids and cement.  Unfortunately, sometimes 

the test fluid seals the entire cell, making it difficult to release the pressure.  

A clogged cell is a safety hazard for lab personnel.  Without a safe way to 

release pressure, everyone in the lab is at risk.

The HTHP Pressure Relief Tool provides a safe way to release the pressure 

in a clogged cell.  It screws onto the cell cap using the existing valve stem 

port.  Then, using a T-handle, the operator can drive a pin into the cell to 

puncture through any obstruction.  The pressure will then vent safely through 

the vent pipe, away from people and equipment.  

#130-77-069 

High Pressure Fitting

#170-17 

O-ring for Valve Stem

#170-91-001 

Valve Stem

#170-91-002 

Body

#170-91-003 

Plunger Rod

#170-91-004 

Plunger Stop

#170-91-005 

Puncture Pin

#170-91-006 

End Cap

#170-91-007 

Handle

#171-23-2 

Safety Pin with Lanyard

Trapped pressure inside an HTHP filtration cell can be very dangerous.  Take 

the following precautions before attempting to open the cell:

1.  Always wear appropriate personal protective equipment (PPE).

2.  Never attempt to open a hot cell.  Make sure the fluid in the cell has 

cooled down to ambient temperature.

3.  Make sure the cell caps and pressure ports are pointed away from people 

and equipment.

4.  Place a rag or towel over the valve stem and 

slowly

 unscrew and remove 

it.  If the pressure is still not released, then use the HTHP Pressure Relief 

Tool to remove the obstruction.

Introduction

Components

Safety

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