Good evening Table 434.6-1 of ASME

3 ft is minimum. If you want to ensure the pipeline remains buried, you can investigate the maximum wind erosion and scour depth of sand typical in the region, then Bury below whatever depth you find offers protection. I have not gone that far, burying to 3ft cover and then relying on regular patrols to notice where the pipeline is experiencing erosive cover loss and replacing that as necessary.


--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

Can we bend internally coated (FBE) carbon steel pipe using bending machine at site as per the minimum radius bend stated in ASME B31.4 ?

Probably best to first do a test on your partcular coating system, layer thickness and installation temperatures to be sure. Damages have occurred.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

FBE is usually good for 2% strain. Work out what the strain is for you particular bend radius.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.