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What is the difference between UT standards ASTM A388 & E587. As per API 7-1 UT requirement is ASTM E587. But we have raw material UT tested with ASTM A388. Is this OK? E587 can be replaced with ASTM A388?

What is the difference between UT standards ASTM A388 & E587. As per API 7-1 UT requirement is ASTM E587. But we have raw material UT tested with ASTM A388. Is this OK? E587 can be replaced with ASTM A388?

One of our customer is asking for product tubing pup joint with material of NACE MR0175 requirement. Also we have to provie coupling as made up. My question is this coupling MTC also has to satisfy the NACE requirement? Or mills are providing coupling with NACE specification? Anybody can help me...

Thanks for the clarification on advisary 6 exception of 6B flange. If we possess API 6A monogram & Q1 (with no exclusions), should we required to prepare & maintain the evidence of design for 6BX flanges for every manufacture?

i am working in a machine shop(related to the machining of drilling components for oilfield). For flex collars, it is seen that step OD(ie. stress relief OD's at middle portions). Any one can provide the optimum step radius/slop required to avoid the stress cracks? Or can I get the details...

why some connections(threads) doesn't need license to cut as for API or premium threads ?.... for example ACME threads...

I am working in a oilfield drilling jar servicing firm. I have watched that thermal sprayed coating of the male spline mandrel is protected by an oil soaked cloth while dispatching the tool. besides to prevent the chance of mechanical damage, is there can be another reason for this (like...