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A follow up question: Do all the parts of an item (i.e. a valve) require mill cert? If we look at a more complex valve, it may contain multiple parts that may be produced from different raw materials. Does it mean that each part would have it's own mill cert? How do we identify which mill cert...

Thanks for the reply! What if the materials does not fall under ASME/ASTM material specifications?

Good day to all. Main question: Can PMI substitute a 3.1 mill certificate? Some Context: - Specification document states this as a general requirement. Not really mentioning which components requires it or which isn't. - We are system integrators that integrate components to build...

Can I conclude that, always find someway to locate the items within its classification area first, and give consideration for explosionproof and purging enclosures only if there is no other way?

Rough explanation on types of purged enclosure. Just for info if anyone else parses through this thread. Type X would reclassify internal enclosure area from zone 1 to unclassified or non-hazardous. Meaning that the enclosure can be installed in zone 1 and the internal components does not...

controlnovice, Thank you for the advice. In this case, I would have to go forward with the Class I Div 2 PLC in a purged enclosure (I'll have to study type X and Y suitability). However, for future implementations, does it make sense to go with unclassified components and put it in a type X...

Hello esteemed engineers, I am looking for a second opinion regarding the following matter. This is because I'd like to clarify any bias since the parties that have advised me so far have vested interest in promoting their solutions. I am looking into locating a certified Class I Div.2 area...