There was a recent thread about pipe which reminded me of this.



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UNITED STATES ARMY PIPE SPECIFICATION



1. All pipe is to be made of a long hole, surrounded by metal or plastic
centered around the hole.



2. All pipe is to be hollow throughout the entire length -- do not use holes
of different length than the pipe.



3. The I.D. [Inside Diameter] of all pipe must not exceed the O.D. [Outside
Diameter] - otherwise the hole will be on the outside.



4. All pipe is to be supplied with nothing in the hole, so that water, steam
or other stuff can be put in at a later date.



5. All pipe should be supplied without rust; this can more readily applied
at the job site. NOTE: Some vendors are now able to supply pre-rusted pipes.
If available in your area, this product is a recommended thing, as it will
save a great deal of time at the job site.



6. All pipe over 500 ft [150m] in length must clearly have the have the
words "LONG PIPE" painted on at each end so the contractor will know it's a
long pipe.



7. Pipe over 2 miles [3.2Kn] in length must have the words "LONG PIPE"
painted in the middle so that the contractor will not have to walk the
entire length of the pipe to determine whether or not it is a long pipe or a
short pipe.



8. All pipe over 6 ft [1.83m] in diameter must have the words "LARGE PIPE"
painted on it so that the contractor will not mistake it for a small pipe.



9. Flanges must be used on all pipe. Flanges must have holes for bolts,
quite separate from the big hole in the middle.



10. When ordering 90 degree or 30 degree elbows, be sure to specify right
hand or left hand, other wise you will be going the wrong way.



11. Be sure to specify to your vendor whether you want level, uphill or
downhill pipe. If you use downhill pipe for going uphill the product will
flow the wrong way.



12. All coupling should have either right hand or left hand thread, but do
not mix the threads, otherwise, as the coupling is being screwed on one
pipe, it's being screwed off the other.



13. All pipes shorter than 1/8" [3mm] are uneconomical in use, requiring
many joints. They are generally known as washers.



14. Joints in pipes for water must be water tight. Those in pipes for
compressed air however need only be air tight.



15. Lengths of pipe may we welded or soldered together. This method is not
recommended for concrete or earthen ware pipes.



16. Other commodities are often confused with pipes. These include: conduit,
tube, tunnel and drain. Use only genuine pipe.

They all made sense to me.

Dean.