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https://www.trendsetterengineering.com/external-tree-cap/

External Tree Cap

About Trendsetter’s External Tree Cap


Developed for applications wi
th space and stack-up height limitations, Trendsetter’s External Tree Cap (ETC) offers our customers a robust metal sealing cap for 27” OD H4 wellheads and mandrels in a lightweight, compact package. While the ETC has been designed for challenging environments such as mud-line cellars with minimum depth requirements for assets below the mudline, it can be deployed in any situation where a simple, effective metal sealing cap is required.

The ETC is operated hydraulically using a hotstab from ROV or surface downline. The H4 locking dogs are held in place with an actuating piston utilizing a flat-to-flat design which functions as the primary locking mechanism. A secondary mechanical lock mechanism, actuated on the ROV panel, provides redundancy. The unlock function is also operated hydraulically. In the event a hydraulic unlock is not effected, mechanical secondary unlock rods can be engaged with an external tool to effect a positive release.

The ETC provides two bore penetrations, accessible by ROV hotstab, to facilitate pressure testing, fluid circulation, and venting of the well bore. A hydrate inhibitor injection wash port is also accessible on the ROV panel. An 18-3/4” VX profile gasket provides the metal seal to the wellbore. The bore penetrations are fitted with metal sealing rotary gate valves and pressure retaining blind hotstabs.

Installed External Tree Cap

 

 
Specifications
 
Design Pressure 10,000 psi / 15,000 psi
Temperature Rating -0 to 250 deg. F
Product Specification Level PSL 3G
Material Class EE