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  1. S

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    Yes, the 10" line is long. It is around 3000 ft. According to the hydraulic study record I obtained, such head is suitable for such a long pipe length.
  2. S

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    Thank you. I believe I will provide more details and possibly schematics in the future. This will make the question put in a better shape. Thank you again.
  3. S

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    Thank you for your reply. I think I have made a mistake in not explaining that this header routes the Product A/B mixture to a storage tank. It is a pipe with a certain pressure of 62 psig in the beginning of the 10" pipe (according to the hydraulic study recorded I have been provided with). I...
  4. S

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    Thank you very much for your valuable answers and the recommendations you have mentioned. I will not complicate this problem and resume with the calculation I have listed in my first point. The recommendations you have mentioned are crucial and understanding the system we aim to change is very...
  5. S

    Two Pumps of Different Product and Ratings Pumping into a Common Header

    Hello, I am handling a pump capacity upgrade project in which I have done a comprehensive overview of the system components. The pump (Pump A) I am going to replace is going to pump a liquid in a 4" line with a flow rate that is 4 times less than the flow rate of another product pumped by...
  6. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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...
  7. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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...
  8. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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...
  9. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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...
  10. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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...
  11. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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)
  12. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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)
  13. S

    Pump Suction and Discharge Velocities - Original Pipe or Nozzle Diameter?

    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...

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