All pipe is to be made of a long hole surrounded by metal or plastic
centred around the hole.
All pipe is to be hollow throughout the entire length - do not use holes of
different length than the pipe.
The ID (inside diameter) of all pipe must not exceed the OD (outside
diameter) - otherwise the hole will be on the outside.
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.
All pipe should be supplied without rust; this can be 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.
All pipe over 500 ft in length should have the words "LONG PIPE"
clearly painted on each side and end, so the contractor will know it's a
Pipe over 2 miles in length must also have the words "LONG PIPE"
painted in the middle so 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
All pipe over 6 ft in diameter must have the words "LARGE PIPE"
painted on it, so the contractor will not mistake it for a small pipe.
Flanges must be used on all pipe. Flanges must have holes for bolts, quite
separate from the big hole in the middle.
When ordering 90 deg. or 30 deg. elbows, be sure to specify left-hand
or right-hand, otherwise you will end up going the wrong way.
Be sure to specify to your vendor whether you want level, uphill or
downhill pipe. if you use downhill pipes for going uphill, the water will
flow the wrong way.
All couplings should have either right-hand or left-hand threads,
but do not mix the threads, otherwise, as the coupling is being screwed on
one pipe, it is being unscrewed from the other.
All pipes shorter than 1/8 in are very uneconomical in use, requiring
many joints. They are generally known as washers.
Joints in pipes for piping water must be water-tight. Those in pipes for
compressed air, however, need only be air-tight.
Lengths of pipes may be welded or soldered together. This method is
not recommended for concrete or earthenware pipes.
Other commodities are often confused with pipes. These include:
Conduit, Tube, Tunnel and Drain. Use only genuine pipes.