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PMI on Already hot dip galvanized stud and nut

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erjainesh

Petroleum
Joined
Mar 12, 2013
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5
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JP
dear All,

can anyone share ideas whether PMI can be done on hot dip galvanised bolts or not? or
PMI is required to be carried out before coating?
 
Unless you want to strip the galv from spots to test you had better do the testing before.

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P.E. Metallurgy, Plymouth Tube
 
I think you can do it but you have to scratch the galv coating off. Why do you need to PMI bolts? Are they structual bolts or pipe studs?
 
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