Water and steam hammer are not uncommon
occurrences in industrial plants. Flow changes in piping
systems should be done slowly as part of good operator
practice. To prevent water and steam
hammer, operators should ensure liquid systems are properly
vented and ensure gaseous or
steam systems are properly drained during start-up. When
possible, initiate pump starts against
a closed discharge valve, and open the discharge valve slowly
to initiate system flow. If
possible, start-up smaller capacity pumps before larger
capacity pumps. Use warm-up valves around
main stream stop valves whenever possible. If possible, close
pump discharge valves before
stopping pumps. Periodically verify proper function of
moisture traps and air traps during operation.
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