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  1. murphymok

    Why Chilled Water Supply Temp = 7C?

    Hi All, A lot of people are using the rule of thumb for chiller design, Chilled Water Supply = 7C, and Chilled Water Return = 12C. Why is that the case? I heard this can be explained using the psychrometric chart. Please advise. Thanks in advance. MM.
  2. murphymok

    Supply Air Temp to Room Question.

    The BMS temp sensor of the AHU said 13C, and when the contractor inserted a temp probe to the ductwork several meters from the AHU, the temp is 16-17C. The temp off the grill is again around 16-17C. Flow is adequate. 3-4C drop seems to be a large difference when considering the distance from...
  3. murphymok

    Supply Air Temp to Room Question.

    Hi, I am working on a fitness centre project where the interior space is very hot, around 29C. The design temp is 23C and the supply air off the AHU is 13C. However, the temp off the supply diffusers inside the premises is 16C and the temp further down the AHU duct is 17C. The building...
  4. murphymok

    Pneumatic and Spring PRV...

    I have a building that uses a pneumatic pressure reducing valve (PRV)to reduce from 200 psig to 15 psig. It is a rather large pressure drop and the PRV is screening loud because of that. So, I will like to find out whether I can install a spring control PRV before or after the existing...
  5. murphymok

    Pneumatic and Spring PRV...

    Hi All, Can a pnuematic pressure reducing valve (200-50 psig) working together with a spring pilot pressure reducing valve (50-15 psig)in the same pressure reducing station? Thanks in advance. Murphy
  6. murphymok

    Problem Revisit: Condensate Receiver Banging Noise...

    Hi, The HP trap is a thermodynamic trap and it was replaced recently. The banging frequency is irregular though and the operator told me that it happened mostly in the morning time. I was there yesterday in the afternoon and I could hear the banging noise. The weather was relatively warm...
  7. murphymok

    Problem Revisit: Condensate Receiver Banging Noise...

    Hi, I posted this problem before. I have a condensate receiver tank that services all the low pressure condensate return from the building, as well as a 1/2" steam trap drip leg from the high pressure steam pipe. There is an occasional banging noise in the tank, sounded like waterhammering...
  8. murphymok

    Darling Brothers HX.

    Hi, Does anybody know this heat exchanger manufacturer, Darling Brothers Limited, before? I have an HX from that manufacturer and need to get the specs of it. Thanks.
  9. murphymok

    Plate & Frame Heat Exchanger Leaking...

    Hi, I have a small plate and frame heat exchanger that pre-heat the domestic water with low pressure steam. It is leaking from the holding bolt connection(the threaded bolt that is used to hold the plates together). What will be the cause? Does it need regasket and recondition of the plates...
  10. murphymok

    Flash Tank Question.

    To Joesteam, No, the flash steam venting to the outside. A safety valve is at the venting line.
  11. murphymok

    Flash Tank Question.

    Hi, I have a flash tank that requires daily draining through a drain line. The piping is as follow: one 70 psig condensate inlet line, one venting line to a safety valve, one outlet line to a FT trap set and an manual draining line at the bottom. Do I need to drain the tank regularly? Or...
  12. murphymok

    Condensate Receiver Tank Regulation.

    Hi Guys, I am in Toronto Canada. I have been trying to find out the bylaws in regards to the requirement or regulation of sewage disposal. Not much luck there. The building I am analyzing takes 200 psig steam and reduces down to 15 psig. There are various 15 psig steam traps directing the...
  13. murphymok

    Condensate Receiver Tank Regulation.

    Art, You are right, the condensate tank is at atmospheric pressure the vent line goes outside the building. How do I calculate the optimal venting pipe size? Thanks, great help. Murphy
  14. murphymok

    Condensate Receiver Tank Regulation.

    Hi all, I might have talked about this problem already. I am designing a steam condensate receiver tank that services both HP (200 psig) and LP (15 psig) condensate from the building. Due to the building's budget, I am trying to design a single tank to service both pressure condensate. Is...
  15. murphymok

    Steam Condensate Tank

    The 200 psig line is using a thermodynamic trap. To Joesteam's comment: I should be able to have one single tank servicing both high and low pressure condensate, as long as the flash tank is sized properly (or big enough?).
  16. murphymok

    Steam Condensate Tank

    I think my ultimate question is that can I have both high pressure and low pressure condensate going into the same flash tank?
  17. murphymok

    Steam Condensate Tank

    When the steam system is shut off for the summer, the only condensate going into the flash tank is from the steam trap drainage off the 200 psig line.
  18. murphymok

    Steam Condensate Tank

    There is a banging sound in the tank and I can see steam going out the venting pipe to outside the building. The tank itself does not have any pressure control. Basically it acts as a condensate receiver tank for both pressure condensates. The banging noise appears when the steam system is...
  19. murphymok

    Steam Condensate Tank

    Hi, I have a question about steam condensate tank for a building. 200 psig steam is supplying to the building and it will be reduced to 15 psig after the pressure reducing valve. There is only one single condensate receiver tank for the building's low pressure condensate returns and the 200...
  20. murphymok

    Heat Exchanger Fouling Effect.

    To 25362 and all, I know all the perimeters on the steam side (pressure, flow and temp). But on the water side, I only know the temps. By keeping the steam side constant, I would like to see a change in flow rate or temp to justify the inefficiency of the HXs and how much it would have...

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