OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com
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23. Increase pressure on top pressure unit to 500 psi over the back pressure.
24.
Open bottom valve stem to initiate filtration.
25.
Collect and note filtrate amount at 10 seconds, 1.0, 7.5, and 30.0 minutes.
a.
10 second 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 opening
the ball valve.
26. Collect filtrate for a total of 30 minutes, maintaining desired inlet and back
pressures.
27.
After 30 minutes close (tighten) inlet and outlet valve stems to seal off the
cell.
28.
Turn top and bottom regulator T-screws counterclockwise to release
pres-
sure.
29. Open the outlet valve on the back pressure receiver to collect all the fil
-
trate in the graduate cylinder.
30. Open needle or bleeder valves on both the top and back pressure units.
31. Remove the top and bottom retainer pins and remove pressuring units
from cell.
32. Drain any residual filtrate collected from the top of the receiver into the
graduate cylinder.
33. Allow the cell to cool in the heating jacket.
34. Once the cell has cooled to room temperature, remove it from the heating
jacket.
35. Open (Loosen) the inlet valve stem to relieve pressure on the cell.
36. Unscrew the outlet cell cap.
37. Wash the filter cake and record the thickness to the nearest
1/32
".
38. Clean and dry the filter press jacket, cell, and pressure assemblies thor
-
oughly.
39. Inspect and replace any or all o-rings (All if test run > 300°F (149°C).
40.
Report: Double the filtrate volume - Correct to the API standard of 7.1 in
2
.
Spurt Loss volume is Optional.