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  • Users: RS82
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  1. RS82

    Hot Water Sealing

    I understand for temp >180F we should be using a cooler to seal..what if the pressure is high enough to exceed the vapour pressure of water considersably..is taht OK or should we still be cooling? Somebody told me that the lubricity characteristic of water goes down, hence exceeding the vapour...
  2. RS82

    API Plan 13

    Hi All, Quick question..vertical pump does not have back wear rings and balance holes due to high suction pressure..we need full discharge pressure in the seal chamber to maintain the API (30%) vapour pressure margin..I am suggesting API Plan 13 to right choice, however, would you open up the...
  3. RS82

    Heat exchanger flow rate

    Hello, could you someone explain to me the effect of increasing the process fluid flow rate, in the tube, in regards to the heat transfer to the cooling water in the shell? What happens if I increase or decrease the flow rate in the tube by keeping the cooling water flow rate constant? What...
  4. RS82

    NPSHA

    Hopefully somebody could correct me here as I must be doing something wrong. The suction pressure on this vertical pump is 106psig and the vapour pressure is 100psig. The suction pressure was taken off of the centrifugal pump datasheet. Subtracting the vapour pressure from the suction...
  5. RS82

    Flow through Plan 11

    Seal vendor has asked for the tubing to be 3/4 to minimize losses as the vapour pressure margin is low and we will need close to full discharge in the seal chamber..but our connection on the casing is 1/2NPT..if we have a 1/2Px3/4T connector, does this not restrict the flow? Should we go with...
  6. RS82

    Fluid Film Load Support

    Could anybody be kind enough to explain to me what is a fluid film load support..I was looking at an FEA completed for the washer and seat and the results have load support..what is this and what is significant about this? What are the factors which effect this?
  7. RS82

    High Suction Pressure

    Could somebody please explain to me the reason behind removing the back wear rings and balance holes on a high suction, end suction pump? I know it is to balance thrust force, but how does this happen in theory? By having higher pressure between impeller and throat bush are we not having a...
  8. RS82

    API Plan 54 w/pumping ring

    What is disadvantage of having an axial scroll pumping ring on O/B seal of dual seal...but have a plan 54? This is a horizontal pump..if the external pump is creating flow of say 3GPM and the pumping ring is <3GPM, is this hindering the flow rate? What would happen?
  9. RS82

    Seal Squeal

    We were testing a dual - tandem metal bellows seals (rotating seal heads) on a vertical pump..the outboard seal has a pumping ring for the plan 53B barrier fluid..we had injected the barrier into the seal at the location of 2 O'Clock and piped up the barrier out at 12 O'clock..the seal squealed...
  10. RS82

    Plan 76 Orifice Sizing

    We are being asked to size of the orifice for API Plan 76 where the vapour is being directed to either flare or a vapour recovery system. 1. Whose responsiblity is it to supply orifice size, seal vendor, pump vendor, or end user? 2. What factors are considered when calculating orifice size...
  11. RS82

    Heat Exchanger Configuration

    I have a job where we we are mounting a shell-tube heat exchanger (API Plan 23) on a OH2 pump..what is the best config for heat exchanger, vertical or horizontal? And why? My thought for venting in an horizontal HE, each coil wrap will have localized vapour pockets which could only be pushed...
  12. RS82

    API Plan 13

    I have a vertical in-line pump with a plan 13 piping. The piping has a high point vent on it..is the plan 13 line not a vent in it self? The piping comes off horizontally from the seal (highest point) and goes down towards the drain line where it Tee's off.. Some say the high point vent is...
  13. RS82

    Suction line vs Discharge line

    Why is the suction line one size smaller than discharge? Why one rather than 'atleast one'? Also, what would happen if they both were the same size?
  14. RS82

    Calculate API Plan 11 Flow rate w/throat bushing

    I Have recently joined a seal company and have the following question. If I am given an orifice size on the plan 11 line and throat bushing diametric clearance of 0.008"..what formulae do I use to calculate how much flow rate is being generated..and if I open up the throat bushing clearance...

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