Rotary Seal Blog

A new video about high-pressure oil seal testing

Here is a new video describing a 320-hour test of 4.500” oil seals operating at 9,500 to 9,800 psi differential pressure. The test was stopped at 320 hours because the 300-hour goal had been exceeded. At the conclusion of the test, the seals were still functional, and capable of continued operation. The pressurized fluid was […]

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Testing super wide seals for drilling fluid-to-oil partitioning service

Many rotary seals that partition drilling fluid from lubricant are used with lubricant overpressure, which improves the ability of the seal to exclude abrasives. With partitioning seals, the typically recommended radial extrusion gap clearance between the shaft and the seal carrier is 0.020”. This relatively large clearance helps to reduce abrasion of the seal and […]

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Recipient of the Warner Professional Practice Award

Kalsi Engineering employee Lannie Dietle is the 2020 recipient of Epsilon Pi Tau’s Region 1 Warner Professional Practice Award for exemplary achievement as a practitioner in a technology profession. A 1974 graduate of California University of Pennsylvania, Mr. Dietle has been employed at Kalsi Engineering since 1982, where he has been a key contributor to […]

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400 psi reverse pressure testing with runout

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 […]

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A 100-rpm test of a 10.49-inch RCD seal at 1,500 psi

We are pleased to announce a successful 200-hour-plus test of a 10.49-inch (266.45mm) BDRP™ seal at 100 rpm and 1,500 psi differential pressure. The used test seal is still in excellent condition and functional at the conclusion of the test (Figure 1). In addition to this test, 10.49” BDRP seals have been tested with 1,000 […]

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Two 1,500-psi tests of 10.49-inch BDRP seals at 75 rpm

BDRP seals (Figure 1) are plastic lined rotary seals that were developed to provide hydrodynamic interfacial lubrication in either direction of differential pressure and either direction of rotation. This design goal was achieved by providing hydrodynamic waves that are capable of pumping lubricant from an unpressurized lubricant reservoir, through the dynamic sealing interface, and into […]

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15 & 100 psi reverse pressure testing with drilling fluid and runout

In June of 2019 we reported on the successful testing of 3.00” (76.2mm) PN 701-10-11 rotary shaft seals in “reverse pressure” conditions where the pressure of the drilling fluid was 100-psi (6.89 bar) greater than the pressure of the seal lubricant. The objective was to determine if the new tanged seal design could exclude abrasives […]

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368-hour, 10,000 psi test of a washpipe assembly

On July 26, 2018 Kalsi Engineering announced a collaborative effort with Packard International, Inc. to provide high pressure washpipe assemblies to the oilfield drilling industry. On May 6, 2019 we announced the completion of a 320-hour test of a  pair of 4.5” Kalsi Seals at 9,500 to 9,800 psi and 120 rpm. Now we are pleased to announce that […]

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Differential pressure comparison of new generation mud motor seal

We recently blogged about a new generation of pressure retaining mud motor seals. These Extra Wide mud motor seals are designed to operate in mud motors that incorporate larger extrusion gap clearance than what previous generation mud motor seals were designed for. This trend toward larger extrusion gap clearances is driven by the demand for […]

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Announcing important advances in mud motor pressure retaining seals

Review of a mud motor design trend Mud motor sealed bearing assemblies (Figure 1) typically have a “pressure retaining seal” location where a rotary seal is exposed to the pressure difference between the bearing lubricant within the tool and the drilling fluid in the annulus of the well. Such seals bridge the extrusion gap clearance […]

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