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We are using Jomar Green Stuff which is rated for use on stainless steel in LPG service. Someone had suggested to us that we use both tape and sealant, but I'm not sure that's going to provide any advantage.

A lot of builders use threaded joints that are then back welded, which is something that I prefer not to do. I have used welded joints wherever possible, but some of the specialized components are not available with anything but NPT threads, so I have to use some threaded joints.

This is a cargo tank application. While carbon steel piping is the most common because it is cheaper and easier to work with, stainless is used frequently in this industry to protect against corrosion from road salt, especially here in the great white north.

We are using 2" and smaller Sch 80 stainless pipe with NPT connections in a liquified gas application. We have found that tightening the joints to seal at room temperature will maintain a seal when vapor is introduced, but will begin leaking when the liquified gas (propane) is introduced. Would...

Thank you for the help. I'm going to see what the availability is like for the Grade B.

Section II shows identical values for both grades in the temperature range I am concerned with (-20°F - 125°F). Section VIII Part UHT has the same PWHT and essential variable requirements for both grades. In essence the ASME Code makes no distinction in how the two grades are treated. The only...

Hello all, We are in the planning stages to build an ASME Section VIII, Div. 1/MC-331 pressure vessel cargo tank. The vessels in our application are typically built from SA-517 material. I have seen two grades used for construction. Most are made from Grade E, but I have seen a couple that are...

RonJeremy, Being on the manufacturing end of things, I understand your point. I am not disagreeing with you, I am just pointing out that even the current committee does not know the origins of all of the rules. As far as Division 2, I would have to agree. I can see a lot of manufacturers moving...

Thanks, Duwe6. That was pretty much my understanding of the code. Our Level 2 guy was trained and examined by a certified Level 3. Prior to his training, which is recent, we have always outsourced all of our NDT. Our testing procedure policy was therefore the procedure that the vendor used with...

TGS4 does have a point. The instructor for the Section VIII Div. 1 course sits on the committee. There were many times during the course where he said that a particular rule was devised long ago out of thin air. When asked why those rules have not been changed, his response was that they worked...

Thanks. Those parts of the code are exactly what I was looking for. My concentration is on design,so I don't normally deal with test procedures and qualifications. That's usually handled by the QA Manager, but management has me involved with this for some reason.

What level of personnel qualification is required to perform a liquid penetrant test on a Section VIII vessel? Our personnel have completed Level 1 and 2 classes.

Thanks for the info. I think I'd rather have something I'm comfortable with than go low cost and take a chance. This is a somewhat specialized application, so the end product is not going to be cheap to start with. I'll see if our materials purchaser can source some XM-11 bars.

I'm assuming that the 300 stainless steels retain their low temperature ductility when cold worked to A320.

TVP, ASTM A320 is another possibilty. It certainly meets my strength requirements, and I'm sure it's lower cost than the Nitronic alloys. It will probably come down to a matter of sourcing.

EdStainless, corrosion resistance is not a really big deal. I need the strength and low temperature ductility. I will investigate XM-11 a little further and see if I can source some. Thanks for the guidance.

I am looking for a high strength stainless steel to use for tension rods. The environment is cryogenic, so the material should be austenitic. Standard 304 and 316 grades do not have the strength I need to keep the number of rods to a minimum. I have been looking at XM-19, but it seems to be...

Does anyone have a good source for multilayer super insulation for cryogenic transport dewars? Thanks.

Hello, first time poster here. I am very new to the field of cryogenics. With regerd to the materials of construction for cryogenic transport trailers for liquified natural gas (LNG), why aren't these trailers made from aluminum? I know that aluminum is used for the tanks for other cryogenic...