Rotary Seal Blog

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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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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Video Showing A Floating Backup Ring In Operation

Introduction to high pressure seal implementation challenges Mechanical designers face five significant challenges when implementing high pressure rotary seals: shaft runout; shaft misalignment; shaft deflection; pressure-related hardware deformation; and the dissipation of seal-generated heat. These challenges, and their solutions, are described below. The video included above shows how our patented floating backup ring addresses the […]

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An extreme high-pressure oil seal test (320 hours, 9,500 to 9,800 psi)

Kalsi Engineering has been performing high pressure oil seal tests directed at increasing the pressure capacity of washpipe assemblies, hydraulic swivels, and similar rotary applications. In a test we completed on May 6, 2019, a pair of 4.500” oil seals were tested at 120 rpm while retaining an ISO 68 viscosity grade oil that was […]

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A new way to address circumferential seal slippage

Circumferential slippage of a seal relative to a housing can produce undesirable effects, such as increased seal and housing temperature and seal and housing wear. Kalsi Seals incorporating anti-rotation tangs (U.S. Patent 8,505,924) haven’t been widely adopted due to the expense of machining matching pockets in the lubricant side groove wall of the seal housing. […]

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