Plastic Lined High Pressure Rotary Seals
Examples of High Pressure Test Results with Plastic Lined Seals
Plastic lined PN 682-5-303 seals were in excellent condition after 1,000-hour duration testing at 7,500 to 7,800 psi (51.71 to 53.78 MPa) in 115 to 130°F (46.11 to 54.44°C) service conditions simulating a 4.875” (123.83mm) washpipe rotating at 200 rpm. They have also performed well in 300-hour duration testing at 3,000 psi (20.68 MPa) with 0.010” (0.25mm) dynamic runout in 200°F service conditions simulating a 10.375” (263.53mm) RCD mandrel rotating at 200 rpm. These tests used an ISO 150 viscosity grade lubricant and were conducted with our patented floating backup ring arrangement, which minimizes clearance at the high pressure extrusion gap. In each test, the extrusion gap defined by the backup ring was designed to be appropriate for the sealing diameter of the targeted application. Successful 4,000 psi tests have been conducted in washpipe service conditions with lubricant viscosities as low as ISO 32 viscosity grade.
Test results suggest that plastic lined seals are appropriate for use as pressure-retaining seals in extreme pressure oilfield applications, such as side entry cement swivels, and RCDs. RCDs will also benefit from the low breakout torque afforded by plastic lined seals. For information on how to implement plastic lined seals with floating backup rings, see the Kalsi Seals Handbook, and call us at 281-240-6500. For available off-the-shelf sizes of plastic lined seals, see our shaft seal catalog.
Kalsi-brand rotary shaft seals are offered for sale under the terms and conditions of the “Offer of Sale” that is included in the current revision of the Kalsi Seals Handbook.