Pipe specifications for idiots 1.
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 to the pipe. 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. 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. Flanges must be used on all pipe.