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water hammer
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what is it?
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For more on marking an answer as the "Best Answer", please visit our FAQ.WATER HAMMER'(1) Very rapid pressure wave in a conduit due to a sudden change in flow; the potentially damaging slam, bang, or shudder that occurs in a pipe when a sudden change in water velocity (usually as a result of too-rapidly starting a pump or operating a valve) creates a great change in water pressure. (2) A banging noise in steam pipes, caused by steam bubbles entering a cold pipe partially filled with water.
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