Posted by jimg.allentown on February 03, 2018 at 19:57:38 from (173.49.133.204):
In Reply to: Compressed air lines posted by coshoo on February 01, 2018 at 11:16:29:
Years ago, I worked in a fabrication shop with high pressure equipment. Pumps, valves, and compressors with working pressures of 5,000 psi to over 100,000 psi. One of the things that became apparent after many failures was that the piping was failing prematurely. Failure was not because of the pressure ratings, but from the cyclic nature of compressors. The constant pounding will make even tubing rated at 3 times working pressure had short life. In the course of R&D, it was discovered that a pre-treating procedure known as autofrettage would greatly extend the life of the tubing. The basic procedure is to pressurize the tubing with a static pressure of over 2 times the expected working pressure. Pressure was held for a length of time and then released. The theory behind this was that over pressuring the tubing would begin to yield the metal. When the pressure was released, the metal was now in a state of compression that countered some of the pressure passing through it in operation. Unfortunately, this procedure will not work with plastics because they simply do not yield. Plastics will hold pressure up to the point that they burst. The constant cyclic pressure generated by a compressor will fatigue the plastic. Then, it fails due to fatigue rather than from excessive pressure. A pulsing pressure like that generated by a compressor will eventually cause the plastic to fail. Black pipe would be the most reliable while copper may well do the job, but maybe not as reliably. Hard drawn copper tends to get brittle over time and may fail for that reason.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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