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  • What kind of seal will be used for wellhead equipment?
    • December 14. 2021

    For wellhead casing head, tubing hanger, JST provides elastomer seals including FS seal, S seal, P seal, O ring, MEC metal end-cap seal and lock screw packing. These seals are essential elements in the integrity and functionality of wellhead equipment. We developed HNBR, FKM, AFLAS and other material accordingly which have high pressure resistance, good sealing characteristics. 1. Materials tested...

  • Why S seal is a preferred design in the oil and gas equipment?
    • December 09. 2021

    Recently, JST 13 inch External S seal has successfully passed the PR2 test at P-U (-20 deg F - 250 degrees F), 10000PSI nitrogen high pressure as per API 6A 21st Edition Annex F Section F.2.14: Design Verification for PR2F Group 5 Mandrel-type hangers, Table F.17 Sections: Pressure from below seals and pressure from above annulus seals. Test as specified in F.1.11 Test Procedure we follow as below...

  • "Diesel Effect" and how does it influence the Hydraulic Cylinders?
    • December 01. 2021

    We recently got a quality complaint from customer that the hydraulic rod was burn during working, see below photo. After analysis with our engineering team, we call this “Diesel Effect”. We’d like to discuss about this. What is the “diesel effect”? The diesel effect occurs in a hydraulic cylinder when air is drawn past the rod seals, mixes with the hydraulic fluid and explodes when pressurized. Ho...

  • How does the V packings work?
    • November 30. 2021

    V-packings, also known as Vee packing seal and Chevron V-packings, or V stack, is a kind of stacked seal. It is combined by a male adapter, a female adapter and a number of intermediate V rings. V-packings are designed to be used in applications such as hydraulic cylinders, fracturing pumps or well downhole. Facing different working condition (temperature, pressure, media), the raw material differ...

  • What is a rod seal?
    • November 01. 2021

    Rod seals are the most important seal within any hydraulic sealing system, which are used to prevent leakage of hydraulic fluid to the outside of the sealing system. Rod seals should be paired with an appropriate wiper and gland housing design to ensure correct operation. Rod seals are often the critical factor in ensuring that a hydraulic cylinder operates at peak performance. Leakage throug...

  • What is back up ring?
    • October 22. 2021

    The back up ring, also called anti extrusion ring, is aptly named as they do just that: they back-up an O-ring. The purpose of using the backup ring is to prevent the O-ring from extruding into the sealing gap under the system pressure. The structure of the increased back up ring will bear much higher pressure than using the O-ring alone. The profile shape of the back up ring is usually rectangula...

  • Wellhead S Seal Solutions
    • October 14. 2021

    In the oil and gas industry, the risk and consequence of unplanned downtime is greatest in extreme environments. JST has long been committed to the provision of sealing solutions for the exploration and production of oil and gas. Wellhead is a critical part of oil and gas infrastructure. Its sealing materials need to withstand pressures as high as 15 000 psi and temperatures of 149º C. From d...

  • What is P seal and how to install it?
    • October 11. 2021

    P Seal is a static seal comprising a profiled elastomeric sealing element with two anti-extrusion metal rings or stainless steel wire mesh rings. It is used in casing and tubing heads to seal rough casing and production tubing. In operation, the inside diameter (primary sealing face) of P Seal acts on the outside diameter of the casing/tubing running through it. The groove/recess in the ...

  • Where to find API gate valves seals?
    • September 29. 2021

    API gate valves refer to the valves which are made under the regulations set by the American Petroleum Institute. They are usually widely used in petroleum and industrial processing plants, playing an important role at shutting off the flow. And it is true that the featured and core part of them is called the wedge. In order to meet the various specifications, API gate valves are indeed designed a...

  • Choose S seal or O ring for Sealing of Wellhead Casing?
    • September 24. 2021

    S seal and O ring both can be used for wellhead casing but they have different functions and suitable for different working conditions. O ring is a static seal. It is suitable for lower pressure, small groove gap and smooth groove surface. O ring is usually combined with back up ring. But in hostile environment, such as H2S, high pressure, high and lower temperature, rough groove surface, o ring w...

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