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  1. fe2655847

    Plan 32 seal piping material

    Hi Experts, Pumping liquid has chloride concentration in a minimum of 1000 ppm and some have 22000 ppm with an operating temp. of >66C. Pumps have seal Plan 32 with seal tubing material specified as 316SS. Given the properties of the pumping liquid, there is a potential for chloride stress...
  2. fe2655847

    API 610 Material

    chti, You will notice on table H.1 there's a second column that indicates full compliance on pump parts. These are all pressure parts which the para. 6.12.1.4 is saying to be full compliance. However, full compliance does not necessarily mean that anything specified on table H.2 to H.5 that...
  3. fe2655847

    motor sizing for centrifugal pump

    Mirghaffari, So long as the motor nameplate rating is greater than your end of curve power, you are okay. But there are also specs that allows the end of curve to be greater than the motor rating as long as this end of curve power is covered within the percentage of overloading the motor i.e...
  4. fe2655847

    motor rotor speed lower than pump speed

    Thanks guys..I have never seen a clause in API or other standars that requires motor rotor speed and pump speed should be the same. I think as long as the motor is sized correctly to drive the pump regardless of gap in speeds, the pump/motor combination will be working fine. Please correct me if...
  5. fe2655847

    motor rotor speed lower than pump speed

    Hi experts, Can a motor with 10HP, rotor speed of 1765 rpm having synchronous speed of 1800 rpm drive a centrifugal pump with 1770 rpm and rated power of 7.3HP? Motor rotor speed is less than pump speed but can the motor accelerate the pump to its rated speed? Or motor rotor speed and pump...
  6. fe2655847

    turndown ratio metering pump

    A turndown ratio of 0.6 is specified under the rated operating condition in the datasheet. That's confusing to me
  7. fe2655847

    turndown ratio metering pump

    Hi experts, Sorry for a rookie question. Turndown ratio specified in the data sheet of 0.6. Pump manufacturer has specified 10:1. Is this acceptable? My understanding is that turndown ratio is pump manufacturer's capability, as long as the rated capacity of the pump is 110% more than maximum...
  8. fe2655847

    Operating near end of curve

    Thanks for the help guys. Appreciate it.
  9. fe2655847

    Operating near end of curve

    What makes it uncomfortable is that the BEP is near the end of curve with its duty point operating 8% more than BEP point(as seen on the attached curve). The duty point must be within the "preferred operating region" ie, 80%-110% of BEP, as the general practice says. The pump is within that...
  10. fe2655847

    Operating near end of curve

    The pump is a horizontal end-suction with a speed of 3550rpm, suction specific speed of 4318(USC). Flow at BEP is 45.91gpm and duty point is 50gpm which makes it 108.91% of BEP...
  11. fe2655847

    Operating near end of curve

    Hello experts, The scenario is this: The BEP flow of the pump is near the end of curve(pump run-out condition).The pump is operating 108% from BEP which makes it very near to the end of curve. It has a considerable amount of NPSH margin of 8 feet. Is this kind of pump acceptable? If not, please...
  12. fe2655847

    Plan 53B drain taps required?

    hello experts, Sorry for the rookie question. I have a pump with a dual pressurized Plan 53B. Does a "drain" required in the seal gland? Whats the best practice? Because per API 682, "quench" and "drain" connections are rarely provided because they are only required when a throttle bushing is...
  13. fe2655847

    Max Diff Head VS Shutoff head

    Experts, What is the difference between the MAX DIFFERENTIAL HEAD and the SHUT-OFF HEAD of a centrifugal pump?Are these the same? Thanks.
  14. fe2655847

    Mechanical seal or packing in VS4 pump?

    I guess employing packing would be adequate because of the considerable gap of vapor pressure of water at 29°C to the atmospheric pressure.Or vapor proofing is optional per bimr's advise. Please note that the drum collects water from hazardous open drains collection header. Could be that they...
  15. fe2655847

    Mechanical seal or packing in VS4 pump?

    The horizontal vessel collects water from hazardous open drains collection header. Does this has anything to do why the pump employs vapor proof design (mechanical seal)?
  16. fe2655847

    Mechanical seal or packing in VS4 pump?

    Hi experts, We have two VS4 type pumps mounted on a horizontal vessel with Ø2000 mm. One operating and one standby. Duty pump will start on high liquid level and will shutdown on low liquid level. If liquid level continues to rise to high high liquid level, the standby pump will start. Both...
  17. fe2655847

    Mechanical run test

    API 610 para 7.3.4.7.1 states that pump, if specified, shall be run on the test stand until oil temperature stabilization has been achieved. Is VS4/VS5 grease-lubricated pump covered in the statement?Is "grease" covered in the word "oil" in the paragraph?I think grease and oil are different...
  18. fe2655847

    Self-venting pump

    @Pumpsmart, Thanks for your help. I agree with you.
  19. fe2655847

    Self-venting pump

    Thank you PumpSmart, With the little brain that I have, my understanding is that in-line pumps like OH3 & OH6 will be not self-venting. Am I correct? Knowing that the pump is OH2 type, should it mean that we specify vent connections in the data sheet especially during FEED engineering even if...
  20. fe2655847

    Self-venting pump

    Hi Can anyone please give specific configuration of a centrifugal pump that is self-venting? API 610 states that all pumps shall be provided with vent and drain connections, except that vent connections may be ommitted if the pump is made self-venting by the arrangement of the nozzles. What kind...

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