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18.
Move the thermometer from the heating jacket to the thermocouple hole
on top of the test cell. The heating time of the sample should be one hour
(no more and no less). Set a timer to 60 minutes. Begin the heating at this
time.
Do not initiate filtration when the thermometer 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
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
required during the heating portion of the test, a Thermocouple Assembly
(#171-45-1) is available which will directly and accurately measure the
fluid temperature inside the cell.
19. While the cell is heating, connect the CO
2
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).
20.
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). Be careful. It is easy to
get burned in the confined space below the heating jacket.
21.
Keeping the valve stems closed, adjust the top and bottom regulators to
the recommended back pressure for your test.
Retaining Pin (#171-23-1)
Retaining Pin (#171-23-1)
Valve Stem
(#170-16)
Valve Stem
(#170-16)
Pressuring Assembly
(#170-04)
Back Pressure
Receiver (#170-06)
Top of Heating Jacket
Bottom of Heating Jacket