Thank you for the response. Do you recommend any friction loss coefficient for a 6"x3" reducer?
Also, Can you give me your point of view about this statement in Bloch's Pump User's Handbook: Life Extension:
1- "the suction piping should be at least as large as the pump suction nozzle and be...
Thank you for your response. Can you give me your point of view about this statement in Bloch's Pump User's Handbook: Life Extension:
1- "the suction piping should be at least as large as the pump suction nozzle and be sized to ensure that the maximum liquid velocity at any point in the inlet...
Hello Pierreick,
Thank you for your response. I did the calculation today. I got a 3ft drop in NPSHA (existing NPSHA vs New flow rate NPSHA). I could not find a reducer friction loss coefficient. However, I used ones for expansion and contracting diameters found in fluid mechanics books (or...
Hi Pierreick,
The system has not changed. The vessel (column) pressure is the same, the suction line will remain with the same diameter (6"), length, fittings, and elevation. The specs of the pumped fluid will remain the same. NPSHA is influenced by these systems.
We have not changed anything...
Thanks Pierreick,
The system already exists but we are going to replace the pump only to meet a higher capacity demand in the process unit. The existing pump will not be able to meet the demanded flow rate.
We are relying on the NPSHA stated in the existing pump datasheet. However, I am going...
Thank you for your response. There was an error in the information I provided. It is a 6" x 4" inlet nozzle.
The suction pump nozzle size is 4" (6" x 4" reducer, 8.6 fps @ the 4" cross-section)
The discharge pump nozzle size is 2" (2" x 4" reducer, 32.4 fps @ the 2" cross-section)
Thank you for your response. I have a made a mistake in the information I have provided in the post.
The suction pump nozzle size is 4" (6" x 4" reducer, 8.6 fps @ the 4" cross-section)
The discharge pump nozzle size is 2" (2" x 4" reducer, 32.4 fps @ the 2" cross-section)
Hi All,
We are going to replace an existing pump with one of a higher capacity (maximum expected operating flowrate is 340 GPM). The suction line size is 6 inch, while the discharge line size is 4". These corresponds to liquid velocities of 3.8 ft/s for suction, and 8.6 ft/s for discharge...
