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Old 01-07-2004, 10:00 PM
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Liquid and air pressure are the same. There is more stored energy in air (compressible) but the pipes are so small, there isn't much that happens when one blows. It just splits and relieves itself. Pressure vessels with a large volume is where things get really dicey if it decides to blow. Can take out the entire building! I have had SCH40 PVC system in my shop for 11 years of 110F summers and 40F winters with no troubles. My walls are open stick frames. If I drywall my shop some day, I'll convert to iron pipe.
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