Pump suction and Discharge Nozzles

[SENGUTTUVAN]

As per API 610, clause 5.4.2.1, for one and two stage pumps the suction and discharge flange rating shall be of same. Does this clause means that for higher stages pumps , where in the Discharge pressure is going to bevery high we can have suction and discharge flanges of different ratings? If so , whether the suction nozzle flange rating are designed for Hydrotest pressure? Please clarify.

 

[BigInch]

You can have different ratings, which can cause pressure limit problems with the suction side, for instance when you might have to recirculate back to suction for start-up or shut-down, in which case it is important to make sure that the suction is not exposed to higher pressure than for that which it is rated.



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"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

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