Texas: Code and Non-code vessels

[engr2GW]

Hello all,

I have a two fold question about using coded and non coded vessels:
1. I understand that Texas and another state (which?) are the two states in the country where code vessels are not required. Most of the vessels (separators) I used are coded, but sometimes we don't use coded vessels on scrubbers and knockout drums. Is there a difference in manufacturing process in a code shop with a coded and non coded vessel?

2. As long as manufacturing process, corrosion allowance, etc. are good, if the state does not require coded vessels, are there serious disadvantages of having non code vessels? especially if there is no plan to re-use in another state?

As much as possible, do it right the first time...

 

[JStephen]

I would think that in most cases, if a code shop is building the vessel, they're going to do things about the same way whether it's a code vessel or not, with main changes being in inspection and paperwork. The bigger potential for changes would be if a non-code shop built it. But, that brings up one of the issues: if it's not a code vessel, just exactly what is it? You can wind up with these undocumented "things" that you think are plenty stout, but hate to be operating a mystery vessel, too.

I'd suggest to research applicable building and fire codes, OSHA rules, and the owner's insurance requirements before specifying the noncode version.

 

[RVAmeche]

It depends on how the vessel was procured. If you asked them to design to ASME but not stamp it, then the material thicknesses and everything should be the same, they just didn't file all the paperwork, have inspections, and U-stamp it. If they were handed a general drawing or spec, they could do anything as long as it passed the hydrotest (if specified?).

As JStephen said, it's a burden of unknowns. The likelyhood of a repair being made that was believed to be adequate, or equipment/something over stressing the vessel because it's limits aren't known increase. Furthermore, if you buy multiple vessels from multiple vendors, there's the possibility their construction is different (again, depending on how much was detailed in the RFP/spec).

 

[Ehzin]

To start off, I believe Louisiana is the other state you mention although I expected there to be more than just two. With a proper shop and a properly designed and fabricated vessel the difference really comes down to paperwork. You can purchase a vessel with the same material, welding, and QC documentation for a coded and non-coded vessel if it's been fabricated in a proper code shop. I wouldn't endorse trying to save money by just not having it coded if you can get by but under the proper circumstance there can be no technical difference between the two.

As an additional comment, even a proper shop can skimp on a non-coded job to make it problematic if code related requirements aren't specified when a proposal/purchase order is agreed upon. They can throw some scrap metal together unless you specify otherwise, at least legally/morally/whatever speaking (I believe this is the case, they may have some due diligence).

Thanks,
Ehzin

 

[oknow]

http://videos.asme.org/category/videos/standards-certification