IRISH GOVERNMENT PIPE SPECIFICATION 1. All pipe is to be made of a long hole, surrounded by metal or plastic centred 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 inside at a later date. 5. All pipe is to be supplied without rust. This can be morereadily applied at the job site. 6. All pipe over 500ft (153m) in length should have the words â€œLong Pipeâ€ clearly painted on each end, so the contractor will know it is a long pipe. 7. Pipe over 2 miles (3.2km) in length must also have the words â€œLong Pipeâ€ 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. 8. All pipe over 6â€ (152mm) in diameter must have the words â€œLarge Pipeâ€ painted on it so 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 hole in the middle. 10. When ordering 90 degree or 45 degree or 30 degree elbows, be sure to specify right or left, otherwise you will end up 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 uphill use, the water will flow the wrong way. 12. All couplings should have either right hand or left hand threads, but do not mix the thread, otherwise, as the coupling is being screwed on one pipe it is unscrewed from the other.