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  • Users: upm
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  1. upm

    Estimate the discharge pressure of PD pump?

    Shall i assume that the discharge pressure will be the same at a the given flow??? we will adjust the pump stroke to meet the desired flow but at what pressure. Does this mean that i need to work out the discharge piping friction at the given flow and add it to the ssyetm back pressure??? upm
  2. upm

    Estimate the discharge pressure of PD pump?

    We cannot opearte the pump without knowing the expected disch pressure.This if our safety rules to ensure the downstream equipment will not be impacted. How can i do it if i only know the flow???? upm
  3. upm

    Estimate the discharge pressure of PD pump?

    Gents, How can i calculate the estimated discharge pressure of a positive disp. pump at a given flow only. The curves are not avialible, the vendor does not exist any more and no data at all for this pump. The pump was not in use and we will connect it to new process and need to estimate the...
  4. upm

    PTFE diaphragm pumps to handle solids?

    Thankx gents, We are buying the pump from Lewa its self . They confirmed the low NPSHA and the performance chart shows that this pump can handle such a low NPSH. However, what worries me is the solids, our process guyes could not estimate the soilds size and therfore, it is unknown for Lewa if...
  5. upm

    PTFE diaphragm pumps to handle solids?

    Gents, We are planning to select a PTFE single diapfragm metring pump to pump gasoline. The pump will opertate at 50 meters diff. head and 1.2 m3/h flow. It pumps from the tank buttom and the stream contains solid particles, does this pump type fit the requirmentrs? Does PTFE handles such a...
  6. upm

    Purchasing API documents

    Thanks gent for the reply
  7. upm

    Purchasing API documents

    Gents, Does any body knows how can i purchase the new API standards? upm
  8. upm

    torsional and lateral criticals

    electricpete Thnaks for the help, as i do not have API-684, do you know any links i can learn about these frequencies??? this is very important to me as the results for lateral/torsional analysis in one of our gear box indicates that we are running closer to lateral speed??? therfore, i need to...
  9. upm

    torsional and lateral criticals

    Gents, I do not know the defference between the torsional and lateral critical speeds ? when do we need to consider either? for new draft forced fan, do we need to do such an analysis as recommended by the API? can anybody explain the ifference in a simple way??
  10. upm

    stand by pump phelosophy

    Gents, very wide subject and if the answer to the question i raised is simple, there will never be such detailed response and discussion. Turning the pump manually is not adviced in our plant as we need totaly to isolate and tag out the pump to do such whsich is not prefered as the main pump...
  11. upm

    stand by pump phelosophy

    i am trying to classify the pumps based on the criticality and services. I am stuck with product pumps and lube oil pumps as swapping might cause a process dip and cause a plant trip (e.g. low lube oil pressure). i am thinking of running them for an hour once a month in circulation and check up...
  12. upm

    effect on pump operates at differnt viscosity

    Thanx guys for the help and it is very clear now . I need to simplify it to our operators to understand upm
  13. upm

    effect on pump operates at differnt viscosity

    Does this mean the work done by the pump remains the same and only the static energy (input power) increases??? In that case during pump evaluation, how do we calculate the head,as normally we use the design diff pressure and specific gravity to calcualte the head. as the discharge pressure will...
  14. upm

    stand by pump phelosophy

    Gents, Thankl alot for your thouts an dlet me answer some of your questions. pablo02: The pumps are used in a chemical plant (olefins) and all varies in size between 3 KW to 1 MW motors. Mainly any pump in the plant is critical as it will cause process upset when both pumps are not...
  15. upm

    stand by pump phelosophy

    Gents, I am in the process to develop a swapping criteria for the stand by pump. When to swap , how and what frequency is required. I know it is not good to keep the s/b pump idle and it is not good to keep on starting it. So we are in between......but what to do???? the objective is to ensure...
  16. upm

    effect on pump operates at differnt viscosity

    sorry it was my mistake as i wanted to say when the density is changed
  17. upm

    effect on pump operates at differnt viscosity

    Gents, If the centrifugal pump operates at different fluid , hence viscosity is different, does the head remains the same assuming no change to the system dynamics or resistance , thus the seystem curve remains the same too??? i know for a lighter fluid the discharge pressure reduces at the pump...
  18. upm

    Tar pump seals

    Gents, we are having lots of problems with the existing single seal for the tar bottom pumps in steam cracker plant. it is pusher type single seal plan 11 (changed to 32) , the seal faces hang up , O'ring got damaged .....etc.. i am planning to upgrade it to dual seal plan 32/62 any bodey has...
  19. upm

    tar pump seals

    Gents, we are having lots of problems with the existing single seal for the tar bottom pumps in steam cracker plant. it is pusher type single seal plan 11 (changed to 32) , the seal faces hang up , O'ring got damaged .....etc.. i am planning to upgrade it to dual seal plan 32/62 any bodey has...
  20. upm

    abrassive wear risistance material

    Gents, I am looking for a material that has the best abrasive wear risistance for pump casing. it is horizantal duble suction volute pump for benzene service. the stream has solid particles and causing the casing/impeller to errod due to abrassive wear. Any idea where can i find a refernce for...

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