Energy

P92 valve seat replacement on site

High-integrity welding intervention on a P92 valve in a power plant in the Netherlands: from mechanical removal through welding and heat treatment to reinstallation and alignment.

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P92-klepzitting vervangen op locatie in een energiecentrale

The challenge

The intervention involved replacing a valve seat in a P92 valve installed in a power generation environment. P92 is a creep-resistant alloy designed for high-temperature applications. It offers excellent mechanical properties at elevated temperatures, but these same properties make welding and heat treatment highly demanding.

The work had to be executed on site, within the constraints of an operational industrial environment, with precise control of removal, preparation, preheating, welding, interpass temperature, post-heating, PWHT, inspection and reinstallation.

Our assignment

CQM Welding was responsible for the complete on-site welding intervention: from mechanical removal of the valve seat through welding and heat treatment to the final installation and alignment. For the valve removal, reinstallation and alignment, we worked together with WZ Valves.

Our approach

Mechanical removal. The existing valve was removed with careful planning to avoid damage to surrounding components and to ensure correct reinstallation.

Preparation and welding. After preparation and inspection of the welding area, the P92 welding procedure was executed under controlled conditions. Preheat was applied and continuously controlled throughout welding.

Post-heating and PWHT. After welding, the component underwent controlled post-heating, followed by Post Weld Heat Treatment according to the applicable procedure. The complete thermal cycle was monitored and documented.

Reinstallation and alignment. The valve was reinstalled and accurately aligned in cooperation with WZ Valves, so that the mechanical and welding aspects were coordinated as one integrated scope.

Project details

Sector: Energy

Services performed: Certified Welding & Piping, Industrial Interventions, Welding Engineering & Specialised Welding

Period: June 2026
Material: P92
Partner for valve removal and alignment: WZ Valves

The result

Complete on-site intervention, from removal to alignment

The P92 valve seat replacement was successfully completed on site, combining mechanical intervention, specialist welding and thermal treatment within one coordinated scope. The client had a single point of contact for the critical welding activities, with a strong focus on first-time-right execution.