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  • Users: lfg2007
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  1. lfg2007

    Plumbing booster pump

    Sorry for the added post but I am struggling with disinformation. The manufacturer of the pump set call for the cla-vavlves to be set with 25-35gpm of flowing water. What impact would this have on the system pressure.
  2. lfg2007

    Plumbing booster pump

    I apologize ahead of time if this is an old question but I could not find it in the search. As a continuation of my pumping problem I ask tyhe following question. When a pump is required to produce 60 psi for a grey water flushing system (2-3psi suctionside)is this pressure and flow expected...
  3. lfg2007

    Pipe testing - Air vs water testing

    All Thanks for the information and sometimes redirection.
  4. lfg2007

    Pipe testing - Air vs water testing

    OK Boy did I mess with the wrong crowd. I will try to be clear as a non professional in this area it is not always easy. Probably not a website for newbies or to waste money on support. Everyone is talking about pressure testing the properties of piping for failure or matereial...
  5. lfg2007

    Pipe testing - Air vs water testing

    I know that when pressure testing piping with air versus water the test psi is not the same. Several of your colleagues indicate that an air test would required about 4x less psi.
  6. lfg2007

    Pipe testing - Air vs water testing

    I am being told that air testing is the same as water testing for pipie pressure testing. I do not believe that the air pressure required would be the same as water. Also theree is probably a saftey issue for high pressure test. Test would be 150 psi water max. Any thoughts
  7. lfg2007

    Plumbing booster pump

    Thanks for all the insight. We have found that the air pressure in the stop cushion tank was much less than designed. It will be filled tomorrow. Several people have told me that the tie in for the stop cushion tank should be to the pump set discharge header. It currently ties in on the...
  8. lfg2007

    Plumbing booster pump

    Some more information. The system has a stop cushion tank with a 90 gallon capacity. If the jockey pump is not running should the stop cushion tank immediately augment the system.
  9. lfg2007

    Plumbing booster pump

    Sorry for any confusion. Two pumps 114' head 45 gpm, jockey pump 114' head 22 gpm. 50 feet from pump to 3rd floor. Guage on pump reads 60 psi.
  10. lfg2007

    Plumbing booster pump

    Problem seems independent of the amount of toilets being used. is 114ft the design operation point for the pumps when running at full demand? YES is 60psi the non operating pressure in the system (no toilets flushing)? YES is the 10psi (3rd floor) the non operating pressure or the pressure...
  11. lfg2007

    Plumbing booster pump

    The toilets in a new building are not flushing correctly. It is being blamed on the size of the pump. The booster pump which has a duty and standby pump rated at 114' head and 45 gpm each and a jockey pump rated at 114' head and 22 gpm in the basement ( elev 35’ ) has 60 psig and they are only...
  12. lfg2007

    preheats in AHUs

    I am having problems with preheats in AHUs. Inside each AHU is a heating coil (Brasch)and an ultrasonic humidifier. The distance between the heating coil and the humidifier is approx 8". The unit pulls air from the outside across the heating coils to the humidifier to the cooling coil. Some...
  13. lfg2007

    NFPA Signoff

    Who is responsible to sign off a project when the sprinkler system is designed by a FP contractor according to specifications by the project engineer. FP drawings and calcs submitted by contractor were sealed by PE.
  14. lfg2007

    Pump controllers

    I agree but.... I think that there was confusion between the electrical drawings and the plumbing. Electrically we have two 60 amp feeders and an additional 60 amp feeder that comes from an ATS served by two 60 amp feeders for emergency. So three 60 amp feeders one for each motor. The pump...
  15. lfg2007

    Pump controllers

    Has anyone heard of having three individual power feeds ( one for each pump) into the controller of a triplex booster pump package. The package I have onsite has one power feed into the controller and then individual feeds to each pump.
  16. lfg2007

    Centrifigal chillers

    All Thanks for the responses. I love this forum. As far as VFD over temp I am trying to follow on ozmosis's comments. The reason the condenser water was cooler than the chilled water is that the secondary pumps were circulating the chilled water while the chillers were off. This was done in...
  17. lfg2007

    Centrifigal chillers

    I have 4 Carrier Centrifigal chillers under commissioning phase. Recently the units (4) shut down while starting on "VFD over temp" alarm. I was told this was caused by the condenser water being warmer than the chilled water. This situation was caused by running the secondary loop without the...

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