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Thursday, 10 December 2020 01:49 -
By P.D. De Silva
Technicians from Walkers Colombo Shipyard engaged in Post Weld Heat Treatment at Minneriya – Pic by P.D. De Silva
Walkers Colombo Shipyard (WCS) have diversified from their regular trade of ship building and ship repair and clinched a Pre Heating (PH) and Post Weld Heat Treatment (PWHT) job at Nipuna Rice Products Ltd.’s new rice mill being constructed at Minneriya.
PH and PWHT is a key procedure to ensure the integrity and strength of welded joints which connect the array of piping that span throughout the mill. The pipes are under constant stress as they carry steam at high pressure and to withstand such conditions, Alloy steel pipes (Gr. P11, P22, P91) need to be welded and heat treated conforming to specific standards to improve the toughness and ductility.