Rotary Seal Blog

Blogging is a way for Kalsi Engineering to provide up to date information more quickly than we can through traditional information channels like our seal handbook and static web pages. Here you will learn how we are working to solve industry problems through posts about new rotary seal products and posts about testing directed at specific industry problems and applications. You will also learn about the people who make it all happen, as we highlight the achievements and milestones in their lives. Visit our blog for the latest information on Kalsi-brand rotary seals and other Kalsi Engineering products and services.

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 with a 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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A 2,300 psi rotary shaft seal test with 0.015” radial extrusion gap clearance

A pair of 10.49” PN 682-21-303 extra wide type A Plastic Lined Seals™ was tested for 100 rotating hours at 2,300 psi (15.85 MPa) and 45 rpm (123.6 sfpm) using an ISO 68 viscosity grade lubricant and a nominal radial extrusion gap clearance of 0.015”. The test included 353 rotational start/stop cycles under full pressure. […]

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Testing a 10.500” RCD seal at 1,500 psi and 50 rpm

Our KLS-brand high pressure lip seals were originally offered for sale after successful 1,000 psi testing of 3.375” diameter seals at 543 surface feet per minute (sfpm), duplicating the surface speed of a 10.375” RCD seal at 200 rpm. The 3.375” diameter seals have a 0.287” radial cross-section and fit in a 0.250” radial gland […]

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Rotary shaft seal testing with drilling fluid and 100 psi ‘reverse’ pressure

Kalsi Engineering has tested various prototype rotary shaft seal designs where the pressure of the drilling fluid is 100 psi (6.89 bar) greater than the pressure of the seal lubricant. Through this effort we learned that this “reverse” pressure condition tends to encourage the seal to slip circumferentially in the seal groove. We also observed […]

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