Permeability Plugging Tester (PPT), 4000 PSI , 115 or 230 VOLT

The Permeability Plugging Tester (PPT), is a modification of the 500 ml high pressure, high temperature filter press. The instrument is used for making filtration tests on plugging materials without the interference of particle settling on the filter medium. Typical differential pressures are much higher than those seen in standard HPHT filtration testing. The pressure cell is the same as that used on the HPHT Filter Press, but it is inverted with the filter and receiver on top. Several filter mediums may be used such as 1/4" thick fused aluminum oxide disks, conventional filter paper or sintered metal filters. The cell is pressurized with hydraulic oil (#171-96-1) and a floating piston separates the oil from the test fluid within the pressurized cell. The conventional cell may be operated to 2000 psi by using hardened steel set screws to secure the end caps. For elevated pressures, OFI has designed a special cell with a working pressure of up to 4000 psi, pressurized with the conventional hydraulic pump.

The apparatus may still be used as a conventional filter press by removing the piston, placing standard valve stems in the end caps, and positioning the cell in the heating well with the filter medium down. Pressure can then be applied to the cell and receiver by using a dual nitrogen manifold and bottled Nitrogen.

A standard 500 ml HPHT Filter Press may easily be converted for use as a permeability plugging tester.

OFI Testing Equipment, Inc. (OFITE), 1006 West 34th Street, Houston, TX 77018-6321. Tel: 713-880-9885; Fax: 713-880-9886.