400 psi reverse pressure testing with runout


Figure 1: A technician assembling a rotary shaft seal test.
Figure 1: A technician assembling a rotary shaft seal test.

In a previous blog, we reported on successful 162°F (72.2°C) tests of the tanged 3.00” (76.2mm) PN 701-10-11 rotary shaft seals with 0.010” (0.25m) intentional runout. In one test, the pressure of the drilling fluid was 15 psi (1.03 bar) greater than the pressure of the seal lubricant. In another test, the pressure of the drilling fluid was 100 psi (6.89 bar) greater than the pressure of the seal lubricant.

We have now performed a successful 162°F test of the PN 701-10-11 seals where the pressure of the drilling fluid was 400 psi (27.58 bar) greater than the pressure of the ISO 680 viscosity grade seal lubricant. The radial extrusion gap clearance between the seal carrier and the shaftwas 0.010”, and the dynamic runout was 0.010”. We ran the test for 203.35 hours at 325 rpm, and then stopped the test to evaluate the seal. The condition of the used seal was excellent. Figure 2 shows the used test seal prior to removal from the seal carrier. Figure 3 shows the virtually unworn condition of the used test seal.

 

Figure 2: This is the drilling fluid side of the used PN 701-10-11 seal before extraction from the seal carrier. The radial pins engage molded rubber tangs on the seal to prevent circumferential slippage.
Figure 2: This is the drilling fluid side of the used PN 701-10-11 seal before extraction from the seal carrier. The radial pins engage molded rubber tangs on the seal to prevent circumferential slippage.

 

Figure 3: This is the used PN 701-10-11 seal. The dynamic surface of the seal is in excellent condition, with virtually no wear after 203.35 hours of 325 rpm operation with 400 psi acting from the drilling fluid side of the seal.
Figure 3: This is the used PN 701-10-11 seal. The dynamic surface of the seal is in excellent condition, with virtually no wear after 203.35 hours of 325 rpm operation with 400 psi acting from the drilling fluid side of the seal.