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Answer Posted / mazhar ali
IT IS BASICALLY TERMED AS 3 ELEMENT CONTROL.
THIS IS USED IN BOILER HOUSE WHERE IN DRUM LEVEL IS CONTROL.
SO IT INVOLVES FEED WATER CONTROL , STREAM FLOW CONTROL AND
DRUM LEVEL CONTROL SIMULTANEOUSLY.
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Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
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