Sunday, April 21, 2024


Mil-Spec Data: Piping, General

1. All pipe is to be made of a long hole, surrounded by metal centered around hole.
2. All pipe is to be hollow through out entire length.
3. All pipe is to be of very best quality, perfectly tubular or pipular.
4. All acid proof pipe is to be made of acid proof metal.
5. O. D. of all pipe must exceed the I. D. otherwise the hole will be on the outside
6. All pipe is to be supplied with nothing in the hole so that water, steam or other stuff can be put inside at a later date.
7. All pipe is to be supplied without rust, as this can more readily be applied at the jobsite.
8. All pipe is to be cleaned free of any covering such as mud, tar, barnacles, or any form of manure before putting up, otherwise it will make lumps under the paint.
9. All pipe over 500 feet long must have the words "long pipe" clearly painted on each end so that fitter will know that it is long pipe.
10. Pipe over two miles long must also have these words painted in the middle so that the fitter will not have to walk the full
length of the pipe to determine if it is long pipe or not.
11. All pipe over six inches in diameter is to have the words "large pipe" painted on it, so that the fitter will not use it for small pipe.
12. All pipe closers are to be open on one end.
13. All pipe fittings are to be made of the same stuff as the pipe.
14. No fittings are to be put on pipe unless specified. If you do, straight pipe becomes crooked pipe.
15. Fittings come in all sort of sizes and shapes. Be sure to specify the direction you are going when ordering.
16. Fittings come bolted, welded or screwed - always use screwed. They are the best.
17. Flanges must be used on all pipe. Flanges must have holes for bolts quite separate from the big hole in the middle.
18. If flanges are to be blank or blind, the big hole in the middle must be filled with metal.


  1. You must be a consultant for the Michigan Building Code committee. Only problem is they are not as lucid as you .---ken.

  2. 19. The big hole in the middle should be strong enough to prevent the metal around it collapsing. If this happens the pipe must be reclassified as rod and inventory adjusted accordingly.

  3. To make large pipe smaller, turn pipe inside out, and mark accordingly.

  4. And all veterans know Mil-Spec is the minimum quality product that meets the requirements as written provided by the lowest bidder. No assurances the product can do the job it was originally requested for.

  5. I'm not military, grew up near 2 air force bases and I remember that zippers cannot be found under zipper, it's something like interlocking slide fastener. LoL

  6. For many years Milspec was the standard for air particulate flow in the biopharm industry before being replaced by ISO standards.

  7. Replies
    1. The word "pipular" makes it memorable.

  8. AND built by the lowest bidder... LOL

  9. You forgot the catalogue description:

    Metal, Tubular. Troops for the use of. 6 Inch extruded.

    Perfectly clear, no?

    Phil B

  10. I needed a transistor to get a mission critical Microwave Transmitter on line again. $1.99 at Radio Shack.
    Waited three days for the mil-spec. Same transistor. Same source.
    Glad we didn't go to war, for more reasons than that :)

  11. I've had to deal with some actual mil-specs and mil-std documents that weren't very far from this. And of course each will reference one or more additional documents that are about as bad.

  12. This was posted on the wall in the control room of a petrochem plant where I once worked, fifty years ago. True then, true now.

  13. #7; It is not "rust", it is "atmospheric corrosion". We had a VP stress that point. Seems to make a difference to government paperwork.

    1. Our stuff didn't rust, it was "tarnished" ...

      Phil B


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