| 21. | A : The most likely cause is a condition known as " water hammer ."
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| 22. | A . Water hammer is another old story, and can occur wherever there is plumbing.
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| 23. | The principle is the same as in the water hammer effect so well known to plumbers.
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| 24. | :1 ) Find a way to start up the system gradually, to reduce the water hammer.
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| 25. | There is also water hammer ( banging ).
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| 26. | Their orders were to aim for near misses to create water hammer shock waves against the hull.
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| 27. | The clunk is water hammer, not only annoying but it can break the pipe at a joint.
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| 28. | Manually operated ball valves can be closed quickly and thus there is a danger of water hammer.
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| 29. | A water hammer is caused by pressure changes in pipes as water flow is stopped and started.
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| 30. | Suggestion : Knocking sounds associated with water-supply pipes are usually caused by what is called a water hammer.
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