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  • Users: gilus02
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  1. gilus02

    Low flow and high head! OH6 or a Reciprocating Pump?

    In the following condition: Diff. Head = 270m Rated Flow= 14.3 m3/hr Viscosity= 0.2027 Cp I've selected OH6 pump but a friend of mind said a reciprocating pump may also meet these conditions. Is there any preference (technical of economical) to choose between these two types of pumps? Thank...
  2. gilus02

    Rotary or Recip.?

    A Reciprocating pump has been previously chosen for working in the following condition: FLUID HANDLED Heavy Residue PUMPING TEMPERATURE (oC)= 50 VISCOSITY @ P.T CP= 415.44 VAPOR PRESSURE @P.T BARA= 6.029×10^(-8) DENSITY@P.T (KG/M3)= 975.85 OPERATING CONDITIONS CAPACITY (M3/Hr)= 0.5...
  3. gilus02

    demineralized water seal plan

    Hi What is you idea for a seal plan for a demineralized water pump? As the main fluid is corrosive do you recommend it for flushing? The main flow at most could do heat removal for us, what about lubricant? We have to use an external fluid for lubrication purpose? Thanks;
  4. gilus02

    System Control Method for Centrifugal Pumps

    Hi; For a centrifugal pump we usually use a pressure gauge or flow meter to know whether the pump is working properly or not. Choosing between these two gauges I just know one preference; We usually use a pressure gauge unless when the performance curve is too flat to detect the operating flow...
  5. gilus02

    Bypass / Recirculation for Centrifugal Pumps

    Hi; As I had a hot talk with my friend over the use of bypass in Cent. Pumps I want to examine whether I am right or not? Based on my knowledge I know three cases in which we can use bypass for Cent. pumps: 1- When the minimum flow is prone to be less than the minimum flow which was determined...
  6. gilus02

    NPSHr and Max. Allowable flow verification

    Hi; I have recently received a vendor datasheet for a Cent. pump and the pump has a problem on NPSH margin at Max. flow. Then vendor replied us we will reduce the Max. flow in order to see you project Spec. I got confused! Is it possible to reduce a pump Max. flowrate? As this pump is API, is...
  7. gilus02

    Misunderstanding about API-610 operating regions

    Hi, In API-610 it has been mentioned that "Pumps shall have a preferred operating region of 70 % to 120 % of best efficiency flowrate of the pump as furnished. Rated flow shall be within the region of 80 % to 110 % of best efficiency flowrate of the pump as furnished." For instance if a pump...
  8. gilus02

    Starting Conditions of a Centrifugal Pump

    As I know two way are used for starting a Cen. pump: Closed Delivery Valve Open Delivery Valve In an oil and gas plant, the starting condition is chosen by instrument&control discipline or process discipline? The problem is we have high NPSHr (exceeding NPSHa) at the end of curve and if the...
  9. gilus02

    What's SYSTEM VOLTAGE DIP?

    What's SYSTEM VOLTAGE DIP? This item is mentioned in the API-610 data sheet. Does anyone anybody know anything about that?
  10. gilus02

    Bearing Type Selection

    For a pump working at 2970 rpm, 583 m3/hr and 21.54m head, I’ve selected ball bearing for thrust bearing and rolling bearing as radial bearing but the vendor proposed sleeve bearing. I am not familiar with this type. Could anyone explain the use of sleeve bearing and give any experiences about...
  11. gilus02

    Pressurized dual seal arrangements

    As I know there are 3 plans for Pressurized dual seal arrangements (53A, 53B and 53C). We usually use these plans when we deal with a corrosive fluid, (not suitable for flushing). The question is what are the advantages and disadvantages of these three plans? (initial cost, long term cost...
  12. gilus02

    pump allowable operating range

    Dear Friends As a mechanical engineer I have to approve vendor documents (VP) for centrifugal pumps, working in a petrochemical plant. Unfortunately some performance curves don't meet allowable operating region (70%-120%), determined by API-910. Some pumps have rated capacity in 40% of BEP...

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