OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com
5
Specifications
Maximum Temperature: 500°F (260°C)
Maximum Pressure: 2,000 psi (13.8 MPa)
For tests above 200°F, refer to the chart below for the appropriate pres-
sure.
Do not use nitrous oxide cartridges as pressure sources for high-
temperature, high-pressure (HTHP) aging. Under high temperature and
pressure, nitrous oxide can detonate in the presence of grease, oil, or
carbonaceous materials. Nitrous oxide cartridges are to be used only
for Garrett Gas Train Carbonate Analysis.
Carbon dioxide and nitrous oxide cartridges are pressurized to approxi-
mately 900 psi at 1 atmosphere (sea level). Therefore, they should never
be transported by airplane without proper packing because cabin de-
pressurization may cause an explosion.
If the aging cells are going to be rolled in a roller oven during a test,
install o-rings on the outer perimeter on the top and bottom of the cells.
Failure to do so can damage the rollers in the oven. Teflon (#175-46),
Viton
®
(#175-47), and Buna N (#175-54) o-rings are available.
Cell Corrosion
Test fluids under high tempreature and pressure can corrode the cell body
and caps. Carefully inspect the cell body and calls for corrosion before and
after each test.
Some materials are more susceptible to corrosion than other. Also, some
fluids and additives are more corrosive than others. OFITE offers a variety of
cell materials for different levels of corrosion resistance and cost.
Mud Volume and Pressure for
High-Temperature Aging
Aging
Temp.
(°F / °C)
Water
Vapor
Pressure
(psi)
Coefficient
of
Expansion
of Water
Suggested
Applied
Pressure
(psi / kPa)
Mud
Volume in
260 mL
Cell (mL)
Volume
with
Teflon
Liner
Mud
Volume
in 500
mL Cell
(mL)
Volume
with
Teflon
Liner
212 / 100
14.7
1.04
25 / 172
225
130
450
326
250 / 121
30
1.06
50 / 345
225
130
450
326
300 / 149
67
1.09
100 / 690
200
116
425
308
350 / 176
135
1.12
150 / 1,034
200
116
400
289
400 / 204
247
1.16
250 / 1,724
-
-
375
271
450 / 232
423
1.20
300 / 2,069
-
-
375
253
500 / 260
680
1.27
375 / 2,586
-
-
325
235
