I am wondering if it is accepted practice to cut a RTJ into a RF flange. I have 2 only 6 inch 1500 ANSI RF pipeline valves for NACE 0175 applicable service. Are there accepted practices that maintain ASME compliance? Or is this strictly within the domain of the manufacturer to certify and re-issue. RTJ flanges are a lot thicker than RF flanges, to allow for acceptable thickness at the bottom of the ring-groove. It can be done. You can weld on more metal onto the face, machine it to RTJ profile. It ptobably will no longer have code face-to-face dimensions, and it will likely have huge heat-affected areas of the body that may lose properties, and I'm pretty sure (without being able to quote chapter and verse), that it won't be acceptable to your code inspector or insurance company. And the manufacturer DEFINIELY won't honor the warranty or accept any liability on the  gate valve.

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