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The welds are not true seal welds. They are only used to transfer heat off the tip of the tubes so they don't overheat and crack. With that being said, we are probably going to bevel the tube sheet and welded per ASME Sect I PFT-12.1 (g). Repair history shows us we are replacing these on a 4-7...

It’s a horizontal firetube boiler that uses waste heat flue gas coming off our ~2300F large glass furnace. Tubes were rolled and welded. We found out recently that most of the leaking tube edges/welds have eroded away.. most likely from steam erosion. Therefore, these cannot be rerolled...

We had a major leak in our waste heat boiler causing a major unscheduled outage recently. After opening up the single pass fire tube boiler, we found out that numerous leaks were present along the tube-to-tube sheet interface where the tubes were rolled/welded. All of them were on the hot side...

A lot of these vessels are from the 80s/90s and we do not have the data books unfortunately. But that is a good point as we are slowly replacing them.

So if I'm replacing a vessel and I know the specific gravity of the fluid will be higher than water, the vendor would change the static head accordingly for the design calcs? Most of our vessels are using fluid with a higher SG than water, and I'm not sure if this was ever caught years ago. It...

In the past, I have always utilized a static head factor of 0.433 ps/ft and vessel MAWP to determine my component tmins for our Sect VIII div 1 vessels. However, the process fluid used has a higher SG than water. Shouldn't I use a head factor based off the SG of the process fluid rather than...

It’s inside a heated building, and there is no U-1 or nameplate on the vessel, which makes it hard to size a PSV for it in the first place.

It is steam from process venting off into a water “vessel.” It isn’t exactly a sparger, but the vented steam helps preheat the water in the atmospheric “vessel” somewhat before exiting to atmosphere.

Is there any code exemption to installing a relief device on a pressure vessel that is always open to atmosphere (no block valves in vent line)? We have a section VIII vessel, but it is treated as a flash vent tank that has a line routed to atmosphere. I don't see the need for a relief device...

I’ll take a look at api 2000 tomorrow! I was looking at Api 520 and ASME VIII, and didn’t know api 2000 existed. This has been going on for over 10 years with rupture disks activating throughout. Just trying to see if there was any sound engineering basis for sending steam to a storage tank...

I have 4 rupture disks from a section VIII div I vessel set @ 175 psig (8200lb/hr is WCDS) that discharge to an atmospheric tank. This tank has a large vent to atmosphere. How do I determine if the atmospheric tank’s open ended vent to atmosphere is large enough?