We have a project using cast Y-strainers, Class 150 and 300, 6" size and smaller.
Material is A352 LCB, rated to -50°F, with Charpy impacts.
Customer has asked for threaded NPT plugs to be seal welded - size 1/4"
Easily do-able, 2 minutes single TIG pass, but: Does this require Post-Weld Heat...