Sealing cap for 2 liter water container.

[CanosSSCS]

Hello. I'm finishing the design for a 2 Liter stainless steel water tank. Originally, I picked out this plug

https://www.oatey.com/products/cherne-petro-econogrip--768316564?upc=675115273320

but I'm no longer sure that it'll work for our application. The sheet metal for the tank is about 0.08" thick and I would prefer to not have to weld a bung for a cap/plug. Any ideas out there? No high pressure requirements, maybe a few psi above atm. I appreciate your time.

 

[IRstuff]

Not sure what your concern is; is it the hoop stress? Stainless steel containers with way thinner wall thicknesses exist, even those that are vacuum insulated

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[EdStainless]

I have SS water bottles that have formed threads. The profile is very rounded.
The actual seal is on the ID surface down past the treads in a slightly reduced diameter section.

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P.E. Metallurgy, consulting work welcomed

 

[dik]

Can you get a stopper that has a little lever device, like the old thermos. The lever pulls the bottom of the stopper upwards and expands the sides to form a seal(I don't know if that's clear enough)?

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[CanosSSCS]

OP here.

Below is an image of the tank, inlet fittings on left, which would require a fill port on the top flat surface. The tank is made out of 0.080" thick SS. Also there is about 1" of clearance above the tank.

 

[EdStainless]

Go out and buy a SS water bottle with a closure that you like (in fact buy 6 of them so that you have extra caps).
Cut it off at the neck and TIG weld it to the top of you tank.
The bottle will be thinner material and it should not be a difficult weld with fine filler wire.
Remember to Ar shield both sides when you weld.

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P.E. Metallurgy, consulting work welcomed

 

[MintJulep]

With only 1 inch clearance on top, how do you expect anyone to use this filler cap?

Do you expect that those nice flat sides you've created in your CAD package will stay that way at "a few psi above atm"?

 

[LittleInch]

Why not just fit a normal tank plumbing connector like this

https://mcalpineplumbing.com/overflow-fittings/water-storage-cistern-fittings/r4mc-tank-connector

and then screw on an end cap like this

https://www.screwfix.com/p/mcalpine...rthkmJu6-5XTLvum_Y8aAn7fEALw_wcB&gclsrc=aw.ds

Or use whatever you've fitted on the end connections and just blank off the end?



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