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

Hardide Coatings and Master Flo Valve Inc (MFV) have developed coating technology to help 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-based MFV found that alternative hard coatings previously applied to the stem assembly were not rated to sufficiently high temperatures.

The coating was applied to MFV's P4-15K choke valve, which is rated from -20°F to 400°F and 15,000psi, and the P4-20K choke valve, which is rated to the same temperatures but a greater pressure of 20,000psi.

Right solution

The valves are usually 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.

‘The subsea market is constantly evolving and we must react to the changes,’ said Philip Kirkham, CEO of Hardide Coatings. ‘Developments in coating technology for HT/HP applications were essential and we have worked with MFV to create the right solution for them.’

This story is reprinted from material from Hardidewith editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.