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Thanks for the great info.

Customer has a client that insists the radiography of ASME Sect. 1 header be performed after PWHT. I found nothing in Sect. 1 that states the order these processes must be performed. Logically, we want all welding to be completed prior to performing the PWHT, so RT's are shot and any repairs...

You might go back to original mfr if they possess an R stamp and see if they can "rerate" the jacket. Dimple jacket designs are based off proof tests completed by the designer, so best to start there.

James is right, just simply not required in Saudi Arabia to be NB registered. The Saudi U stamp holder may not even have a NB Certificate to register vessels with the National Board. Mfr will still complete U-1 or U-1A Data Report for completed vessel with AI involvement.

The AI's job was the vessel meet the requirements for ASME VIII-1 for which it was being stamped. If the purchaser requests additional design data, that is between the vendor and the purchaser, and not in the realm of the AI. The AI does not typically see purchase order from purchaser to...

I have seen problems on some high pressure boilers when they ran in low-fire most of the time. The problem comes when stack temperatures do not exceed the dew point, causing lots of condensation of the fireside. Also, have seen some people lower the pressure on a boiler and therefore lower...

Is is a P-3 or P-4 form (Mfr's Data Report form)? What Line of the form does it appear on? I've signed both P-3 and P-4 (and P-4A) data report forms and have not seen TST acronym used. Is there a Tubesheet on the boiler or Part?

Most states have laws for pressure vessels subject to internal pressure, not under vacuum or external pressure. We often confuse this because many vessels are rated for both (internal and external) pressures as stamped on their Code nameplates. Check with your jurisdiction to find out if...

Check with your boiler inspector (insurance or jurisdictional) that inspects your boiler for it's operating certificate. TN requires a high pressure boiler to be "checked" every :20 min., but that does not mean you have to blow-down the low-water fuel cutoff device each time.

You should check with your jurisdictional authority, they may have some requirements for clearances around the vessel. Be sure to think about potential maintenance issues, I've been involved with several welded repairs just at toe of weld of saddle which supported an autoclave. It was easy for...

I think since there is no head to shell weld seam you are correct in using 1.0 for your efficiency for UG-27 calc.