펌프 토출라인 설정과 관련하여..

 

1. Provide block valve for isolate the discharge side

 

 

2. Provide a pressure gauge (PG or PI) to verify the discharge pressure

 

 

3. Provide check valve to protect the pump

 

 

 

 

 

4. Control valve SHALL be located at discharge pump

 

 

5. Provide minimum flow to protect the pump

 

 

Centrifugal pumps should not be used at a low flowrate less than a certain percentage of BEP ( Best Efficiency Point). Generally the minimum flowrate required for centrifugal pump may be in range 50%-70% of BEP.Usually, in the design basic stage, or proposal stage we assume of 30% of rated flow. This assumption shall be updated in project or detail engineering stage based on vendor information and pump performance curve.

The system can use RO or control valve or automatic recirculation valve (ARC).

The rule of thumb say that the control valve system typically becomes economical above 50 hp ( 38 kW) and the RO applied for pumps below 50 hp (38 kW).