Dear All.
There are some issues and concerns about bolt and nuts:(please mentioned reference document)
1.If the ring gaskets are lubricated and bolt tightening have been done and no leaks observed during hydro testing, is it accepted or not?if not flanges must loose?
2.Unfortunately after tightening, C.S bolts and nuts are
painted.is there a document that painting forbidden or not (especially for sour service)?
3.B7M bolt and nut have rusted before tightening, are they must be derusted or not& how?rusting can affect on torque value? and regard to any leakage observed can be assured that min required tension are applied on bolts?
