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  • Users: EngMecBra
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  1. EngMecBra

    Return of liquid in discharge line

    Hi, Here we have a pumping system that sends a specified volume of water to a tank, it works by batch. In discharge line we have a valve and a flowmeter, when the required volume of water is achieved at the flowmeter the valve closes and the transfer is completed. There is a plate with a lof of...
  2. EngMecBra

    Pump in Cast iron, fluid with Cl

    Hi everybody! Here I have a centrifugal pump bought but not manufactured yet in cast iron, and this pump shall handle water with Cl content round 500 ppm. The client has said that we MUST change material from cast iron to SS 316. Will I have problems with corrosion and the client is correct...
  3. EngMecBra

    Parallel condition - Centrifugal pump

    Hi everybody! Here I have a pump that will operate in a parallel condition in its discharge, but I don't know how add their respective curves B-C and B-D, please see attached file. The pump will operate with flow 100 m3/h, but 25 m3/h in B-C and 75 m3/h in B-D. Who can help me? I've already...
  4. EngMecBra

    Recirculation - Centrifugal Pump

    Hi everybody I have a pump (manufacturing yet) that in its alternative condition shall handle only 90 m3/h, but its minimum continuous stable flow is 110 m3/h. Shall I consider a recirculation of 20 m3/h, right? But my question is: can I consider a recirculation to suction line or must I...
  5. EngMecBra

    Calculation of positive displacement pump

    Hi I'm doing a calculation of a positive displacement pump and I have a question. At suction flange the pressure is 1 kgf/cm2 g (considering all suction losses). Considering all downstream pressures losses, the required discharge pressure is 6 kgf/cm2 g. Should I calculate required design...
  6. EngMecBra

    Maintenance analyzis reports

    Hi everybody, I would like to know what must be included or not in reports concerning three "maintenance issues" - oil analyzis, thermography, vibration analyzis. I don't have any maintenance experience and I haven't never seen this kind of reports, hence I don't know exactly what kind of...
  7. EngMecBra

    Pump curve doesn't cross system curve

    Hi everybody, Process team have informed me a rated head of 41m, then I have selected a pump. Now I have been informed that the new head is only 15m. The problem is that the pump has already been bought! Neither with minimum diameter impeller the pump curve crosses new system curve! What kind...
  8. EngMecBra

    Flanges - Cast iron (pump) / Carbon steel (piping)

    Hi, Here I have a pump in cast iron, discharge nozzle 4" 125# FF, that shall be connected to a pipe line in carbon steel, flange 3" 150# RF. Am I going to have any problem? I'm worried with the possibilities below: 1 - Cast iron flange be broken during assembly due to its fragility. 2 - Cast...
  9. EngMecBra

    Pumps operating in end-of-curve

    Hi, Here I have pumps selected for specified rated head and flow, but they are always operating in end-of-curve. There isn't any globe valve or control valve in discharge line to set specified rated flow. For process, it's no problem because the service is water transfer from a basin to a...
  10. EngMecBra

    Self-priming centrifugal pump manufacturers

    Hi, I'm looking for self-priming centrifugal pump manufacturers. The pumps in question are in polypropylene or Alloy 20 or Carbon Steel lined with PTFE, all three options are acceptable. Could you help me? Tks Rodrigo Alves
  11. EngMecBra

    ASME B73.1 pump manufacturers - Full compliance

    Hi, I'm looking for manufacturers which pumps are FULL COMPLIANCE with ASME B73.1 Std. Some manufacturers complies only mechanically, but not dimensionally. Could you help me? Tks Rodrigo Alves
  12. EngMecBra

    Siphon Effect

    Hi mates! I'm calculating the differential head of a centrifugal pump, but I don't know exactly the downstream piping design (length and height of piping). The elevation of pipe rack is undefined too. Can I consider siphon effect (increasing piping from top to bottom), and not consider the...
  13. EngMecBra

    Doubt - VSF or two pumps?

    Hi, Here I have a pump service that shall operate in two different flows: 150 m3/h or 600 m3/h. I'd like to know which option (probably) is cheaper: only one pump with VSF or two pumps (one pump for 150 m3/h and another pump for 600 m3/h). Thanks. Rodrigo Alves.
  14. EngMecBra

    Impeller diameters

    Hi, What kind of problems may occur if a pump operates with a rated impeller diameter of 584mm, with minimum and maximum impeller diameters of 562 and 740mm? The difference between minimum and rated impellers is too small, only 22mm, while the difference between maximum and rated impellers is...
  15. EngMecBra

    Normal and Rated Capacities

    If we select a pump by rated capacity x diff. head, how the pump operates in the same head with normal capacity (normal operating point)? The performance curve shows that if the operating point goes from rated capacity to operating capacity (right to left in performance pump curve), the diff...

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