By Bruce Sharp, David Sharp
Water hammer, or the examine of fluid temporary behaviour, is among the commonest difficulties within the water engineering group. This publication covers the various factors and ideas in a realistic approach and is an important reference for all these involved in the move of drinks, not only water, in pipe structures. It follows on from the authors' prior monograph at the difficulties and strategies of water hammer and offers universal difficulties within the type of case stories. this is often a fascinating and precious learn for training engineers operating during this zone and it'll permit them to make comparisons with their very own difficulties. additionally the sensible nature of the publication makes it invaluable for civil engineering departmental libraries and departments the place hydraulic layout is taught.
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Extra resources for Water Hammer: Practical Solutions
A Favourable profile Fig. 63 Pipeline with air vessel 38 Water hammer: practical solutions Table 6J Chandler Hill data No. 4. 5 below. The air vessel was connected to the system near the pumping station with a pierced reflux valve, that is, one that opens freely on downsurge but the return surge (valve closed) passes through a throttle in the valve. This is independent of the normal non-return valve at the delivery flange of the pump, and the condition studied was clearly for a power failure of the pump.
And the inertia symbolised by GD^ is in kg m^. m. Whilst the evaluation of the exact inertia is laudable, given the uncertainties in the system and the difficulty of prescribing the events which produce the water hammer, it must be recommended that the sensitivity of the water hammer to various values of inertia be tested. There are indeed cases where complicating factors such as water column separation may mean that greater or lesser inertia can be associated with unexpected water hammer, not necessarily inversely proportional to the inertia.
11 is examined. Specifically, the air in the riser of the fire pump is normally removed by a dump procedure. The system is also regularly tested with no demand. The pump may well be up to speed, developing enough head to overcome the jockey pump mains pressure, before the air is removed. Consequently air gets into the system and may accumulate as air locks. >}> 34 35 36 37 38 39 40 41 42 43 44 -^•-^ Demand Air in riser I / ri '^ Jockey pump Dump f 'Fire pump below sea level Fig. 11 Offshore platform fire protection and then be arrested producing water hammer in excess of pumping into an air-free closed main.