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Thank you gentlemen for your replies. The vessel is indeed being fabricated by a machine shop with a certificate. Actually, I asked them the same question after posting this, they gave me the same answer. I should have asked him first but didn't think to. Again, thanks!

I am working on a pressure vessel for laboratory use that is designed per Division 1 rules. I have been doing extensive FEA on the design per Division 2 guidelines, but I am not clear what is required for ASME certification under Division 1 rules. If the PV is based on Div 1 design by rule...

Gauge pressure is the same as absolute pressure on the moon, so you can still design according to gauge pressure.

Use gage pressure, since it is the differential between internal and external pressure that creates stress.

I am designing a pressure vessel that will be using Inconel 718 bolts due its strength retention at the design operating temperature of 550C. Preliminary testing has shown a problem with galling when torquing the bolts with dry threads, so I am considering using anti-seize to prevent galling...

Thank you, gentlemen, for your replies. I have a device that heats water in a tube by means of external electric resistance heating and heat conduction through a metal matrix surrounding the tube (and not by having the heaters directly immersed in the water) to generate steam. The...

In the preamble to Section I, there is this verbage: "Unfired pressure vessels in which steam is generated shall be classed as unfired steam boilers with the following exceptions: (a) vessels known as evaporators or heat exchangers" What is the difference between a device classified as an...

Thank you for your reply. If the customer actually desires a rupture disk rather than a pressure relief valve, does Section I allow it? I'm not seeing any indication that it does in part PG.

Hmmm. In Section VIII either a pressure relief valve or a rupture disk can be used for overpressure control, mentioning both specifically. Section I speaks only of pressure relief valves in part PG and says nothing about rupture disks except in part PVG, which is not applicable to me.

I can't find anywhere in Section I where it actually states that, and I don't want to assume anything. I am designing a forced-flow steam generator with no fixed steam and waterline for laboratory research use. Thx.

The lab will be unmanned during operation, so no safety hazard. But I think I will stick to the approved list for the proof-of-concept prototype and deal with the increased iron content problem later.

First of all thanks to all of you for your replies, I appreciate every one. I was beginning to suspect something like a stress corrosion problem. Thanks for pointing that out, metengr. This will not be a problem with the initial research system, but the final production model will have to...

Thank you for your feedback. Apparently this sounds like a sketchy idea to you guys. This boiler system will be used to provide superheated steam at 70 bar for a research project I am not at liberty to discuss. The tubing in the system will have a pressure rating of over fourteen times the...

Hello all, I am designing a small boiler/superheater system that will use heaters having inconel 625 tubing cast into an aluminum matrix that has an electric heater embedded in it. This is an off the shelf item. I will use three in series, the first to boil the water, the second to raise the...

Thank you! That is exactly what I was looking for.

Hello everyone, I am designing a pressure vessel according to division one rules. It is a special purpose pressure vessel that will have a door to allow access into the PV after depressurization. The door opens internally and is sealed against the PV by the operating pressure. I have...

I am designing the flange cover according to UG-34, Unstayed Flat Heads and Covers,with reinforcement for those holes that penetrate all the way through according to UG-36. I am not finding any rules for blind holes in flat covers. The approach I am taking is to do FEA to verify that the...

They are inside the bolt circle diameter. They are for instrumentation and other purposes and are dictated by the customer, who is quite adamant about their presence.

How does Division 1 handle external holes in flange covers that do not penetrate all the way through? If the hole goes all the way through there are rules for reinforcement. Do they apply to blind holes as well? Or is there a calculation such as for the minimum thickness over a seal groove...

Hello folks, I am designing a pressure vessel according to division 1 rules. The PV will operate at a high temperature, so the LSR factor is 1.56, which results in a test pressure just about twice the design pressure when also factoring in the 1.3 multiplier. This is causing concern with...