A Hardide coating reactor being loaded.
A Hardide coating reactor being loaded.

An international collaboration between Hardide Coatings and Master Flo Valve Inc (MFV) has developed a new solution to protect high temperature, high pressure (HT/HP) subsea choke valves.

The valves are the first of their kind to feature the Hardide-T coating, which can be applied to choke valve stems so they can withstand temperatures up to 400°F and pressures of 20,000 psi.

Canada-headquartered MFV found that alternative hard coatings previously applied to the stem assembly were not rated to sufficiently high temperatures. The challenge was to have a durable coating with a completely smooth finish to form a tight metal to metal seal.

They are typically installed on subsea production trees and are used for single/multi-phase production or water/chemical/gas injection. There is also an application for use on a capping stack, designed to be deployed in the event of a blow-out situation.