Metal End Cap Seals are one of the metal bonded elastomeric seals with the high level of extrusion resistance necessary for high pressure casing and tubing applications.

JST has designed a PEEK End Cap Seals instead of Metal End Cap Seals to meet with customers special requirement.

Why do we choose a non-metallic non-extrusion device as non-extrusion device for this seal? It’s because the lock down screws which can apply large amount of compressive force against the packing and metallic type non-extrusion device will damage the sealing surfaces when the packing is energized.

In July, 2021, JST’s 11 inch Tubing Hanger 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:

After the PR2 test, the condition of the Peek End Cap Seals are good at the point when the hanger is being pulled out of the tubing head.

The condition of the tubing head sealing bowl is good and there is no damage that is caused by the seal non-extrusion device. Which meets with customers operational requirements.

Last but not least, we have also proven that the seal is resistant to RGD/ED.