It's not water hammer which is just one bang when a solenoid valve as on a dishwasher or laundry washer closes. It is not air getting into the lines because her water lines have pressure in them. Water shoots out any opening. No air can get in. My experience with vibrating pipes is the old type of hard rubber washer in a stop and waste valve used everywhere at that time. The bib screw that holds the washer in place gets eroded away allowing the washer to move as water flows past it. sometimes it will be in just the right position to open and close the valve very rapidly as the water flows through, setting up a vibration. Stop and waste valves can be readily opened up with a fairly large wrench just under the packing nut, but they will be stubborn of course with age. Be prepared to replace them probably with ball valves.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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