strange cylinder cap size
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  1. #1

    strange cylinder cap size

    Greetings!

    I have 3 old high pressure gas cylinders I recently picked up for personal use, they were made in the 1950's and have a fill pressure of 3500psi, I would say they are big enough to hold around 300cf. They came without caps and I've found that the normal size 3 1/8 inch caps are slightly too small, while the other common size 3 1/2 are too big. It appears that the cap size would be 3 1/4" or maybe 3 3/8" -- either way I am having trouble finding anywhere that even has caps that are not 3 1/8 or 3 1/2 .

    Would appreciate any advise you guys have on where I might look for an uncommon size cap? Thanks!

  2. #2
    Join Date
    Nov 2012
    Location
    new york city
    Posts
    6,815

    Re: strange cylinder cap size

    refrigerant tank?
    i.u.o.e. # 15
    queens, ny and sunny fla

  3. #3
    Join Date
    Mar 2011
    Location
    Western Washington
    Posts
    5,242

    Re: strange cylinder cap size

    Pics???

  4. #4
    Join Date
    Oct 2006
    Location
    Illinois
    Posts
    9,137

    Re: strange cylinder cap size

    Contact local welding supplier and ask or stop by with one if them.
    We've had older Oxygen tanks and they had standard size threads and caps.


    Sent from my iPhone using Tapatalk

  5. #5

    Re: strange cylinder cap size

    Quote Originally Posted by ronsii View Post
    Pics???
    Yes great idea! Here are some pics:


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    Tank markings:
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    3-1/8 Cap is too small
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    3-1/2 cap just slides on over the threads
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  6. #6

    Re: strange cylinder cap size

    I got out there and measured them -- thread diameter seems to be 3-3/8"

    I also did some research on the markings: mil-c-16638A means they were Navy tanks for general non-liquified compressed gas use on ships.

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