Kelly:
Don't question me, I don't appreciate it. This boiler has come up on other sites. I have attached a photo of the stamp data from Chaski. You can see this cleaned up area in the original photo above.
J.R.

Every single boiler built by Benson Mountain had a stamp on them too, right up until state inspectors in some jurisdictions ground them off and took them out of service.

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Yes, behind Lexan shields with Adam Savage.

YIKES! Please don't send Luigi and Guido to break my knees!

I question the stamping. The overall layout of the stamping is not correct by current ASME code standards. Even if the clover leaf is legitimate, the boiler looks bad. I would need to see more before any attempt to fire it.

I don't see any National Board registration number, so apparently no paperwork on file.
I'm seeing Bensen Mountain Boiler equivalent.....

Can J,R, May repost the cleaned-up version of the boiler stamp? I can't read the rusted original clearly.

This reminds me of pills from certain regions of the world that are 'stamped' with the code numbers for legitimate medications. It is comparatively easy to approximate the markings. That is no guarantee that an actual regulatory (or other) agency has passed upon... or even laid eyes upon... the artifacts in question.

Does anyone have historical detail on GABCO and its "boiler design methodology'?

Pictures aren't much better to zoom in and get the stamp info off of, but here is the listing.
https://www.chaski.org/homemachinist/vi ... p?t=112473

The add states this is an ASME Code boiler, but I don't see the ASME cloverleaf with an "S" in the center in any of the posted photos. Code stamped boilers would have this indicating the shop that built it is/was an S Certificate holder and the boiler was built to the version of the Code in mandatory use at the time. The manufacturer would have also filled out a Manufacturers Data Report, per Code requirements. The data report may have or not have, been filed with the National Board of Boiler and Pressure Vessel Inspectors. Usually a number is assigned to registered boilers and that number appears just above the manufacturer's stamping with either the National Board cloverleaf (modern registered boilers) or the letters "NB" (older boilers) preceding the registration number.

I stand corrected and apologize for posting inaccurate information. The boiler was most likely built to ASME Sec. I, 1965 Edition, 1966 or 1967 Addenda.

Perhaps I lack imagination or experience. Can anyone explain how this thing holds 150 psi with those large, flat, apparently unsupported sides?
Any chance that backhead was “repurposed?”

Well,

Gabco B and E (Gabco Boiler and Equipment Company) at one time may have done business with a NATO Government entity;

https://www.nsnlookup.com/cage/8a584

They have a CAGE code (Commercial And Government Entity Code).

This is a unique number assigned to companies selling things/services to NATO Governments.

Their code is listed as "Cancelled without Replacement", so they went out of business.

Perhaps that is an unfinished boiler that did not have the side sheet staybolts installed (a later step in the assembly process ) when the company went bankrupt and some one bought the unfinished boiler from the estate of the bankrupt company ?

But the code stamping is not supposed to go on until it's tested, but cutting a few corners maybe why they went bankrupt ?

Hard to believe that a company with enough business/reputation to get a CAGE code would build that.

Or the stays between the outer sheet and inner sheet are studs welded on the inside of the outer sheet as a quick "non-repairable" amusement park boiler ?

Hard to tell from one picture.

Cheers, Kevin.

That’s interesting info on GABCO. I’m still mystified as to what that thing is.

BSO = boiler shaped object

There are 8 GABCO boilers/pressure vessels registered in the Oregon State database dating from the late '40s to the late '60s.
This pv listing is s/n 2404(1968) where the boiler is s/n 2392(1967).

So GABCO was probably a small west coast shop building about 100 objects a year.

Mandatory National Board registration is still not adopted in every state.

OREGON DATABASE LINK