Dear Paul
Thanks for your collaboration in elaborating this tough big issue with your sense of humor.
And yes dear Chris,you are completely right .If you have one end of the pipe in your hand you will get the increment from one side and so your interprtation of single and double random lenghts of pipes should be correct based on how you have got it in your hand! But frankly speaking I did not ask for the specification and random lenght of such pipes you had imagined.Those who expect to have such double random lenghts are avaricious!
I appreciate other friends' clarifications on the subject issue .
Cheers
Reza
Paul Bowers <pbowers@pipingdesign.com> wrote:
Chris wrote:
> >I would like to know how you interprete the concept of single and
double
> >random lenght of pipes in the language of piping?
> I think for single random lengths, the length differences occur at
only
> one end; with double random the differences occur at both ends.
> Sorry--couldn't resist.
Important points to note when ordering pipes - please keep to specifications.
All pipe is to be made of a long hole, surrounded by a solid material
which is centered around the hole.
All pipe is to be hollow throughout the entire length, do not use holes
of different length to that of the surrounding material.
The ID (inside diameter) of all the pipe must not exceed the OD (outside
diameter) otherwise the hole will be on the outside and the pipe will be
referred to as rod.
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.
Pipe is sometimes supplied without rust; this can be applied at the job
site. Note: Some vendors are now able to supply pre-rusted pipes. If
available in your area, this product is recommended, as it will save a
great deal of time at the job site.
All pipe over 500 ft (150m) in length should have the words "LONG PIPE"
clearly painted on each side at the end, so the contractor will know it
is a long pipe.
Pipe over 2 miles (3.2km) 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 pipe.
All pipe over 6 ft (1.83m) in diameter must have the words "LARGE PIPE"
painted on it, so the contractor will not mistake it for 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 degree or 30 degree elbows, be sure to specify
left-handed or right-handed, 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" (3 mm) are very uneconomical in use,
requiring many joints. They are generally known as "washers".
Joints in pipes for piping water must be watertight. Those pipes for
compressed air, however, need only be airtight.
Lengths of pipes may be welded or soldered together. This method is not
recommended for concrete or vitreous clay pipes.
Other items are often confused with pipes. These include: Conduit, Tube,
Tunnel, Duct, Culvert, Straw or Drain. Use only genuine pipes.
When shortening pipes, ensure to shorten the length. Shortening the
height or width produces two troughs, which are open ended holes.
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[Non-text portions of this message have been removed] Received on Sat Aug 14 01:46:00 2004
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