The initial scheme opened in 1906 with two 42in diameter pipes.
Use one-half or three-quarter-inch diameter pipe; the sections should be at least 12 inches long.
Hot-water systems take up less room because the water circulates in small diameter pipes.
Originally half-pipes were half sections of a large diameter pipe.
This is a vertical water circuit with large diameter pipes.
They are also only effective on small diameter pipes - 40-50mm rather than main sewer pipes of 110mm.
Small diameter pipes otherwise inaccessible for examination can now be viewed using pipeline video inspection.
An 18-inch diameter pipe runs around the perimeter of one floor and delivers fuel to each engine.
Cat-back exhaust systems generally use larger diameter pipe than the stock system.
For small diameter pipes there may not be enough room for the tractor mechanism.
