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  1. GeorgeMech

    NFPA 20 Check Valves in Sensing Line

    Guys, Any reason why NFPA requires 2 check valve in the pressure sensing line and why is it require to be separated by 1.50meters. Thanks!
  2. GeorgeMech

    what the type of fire protection in pump room

    Just protect all the rooms with automatic sprinkler system and you could sleep without worries.
  3. GeorgeMech

    question in hydraulic calculation

    Stookeyfpe, Yes it is true and most of the cases standpipe system is more demanding compared with sprinkler system, my statement is only to clarify the question of zicooo regarding on combining the standpipe system and sprinkler system in calculation, although, NFPA also states that if the...
  4. GeorgeMech

    Transformer area calculation

    Davidson, Your assumptions are correct but remember that this is only "theoretical", minimum demand required. When you are using the actual spray nozzle, it tends that the demand of the system is more compared to the theoretical value.
  5. GeorgeMech

    Transformer area calculation

    Chicopee, It depends upon the area and the AHJ. Most of the transformer here in Qatar is protected by deluge water spray system and it's a requirement from the AHJ.
  6. GeorgeMech

    question in hydraulic calculation

    as per NFPA 13, the calculation must be performed for each system (Standpipe, sprinkler and etc) and not in combination of two systems. In case you are calculating sprinkler system in hydraulic calculation, you don't need to consider the standpipe connection as a standpipe demand but only a hose...
  7. GeorgeMech

    Standpipe vs. Riser

    First you have to check what system you are connecting into that vertical pipe, is it sprinkler or standpipe system or both (combined system), then you may clearly identify whether it is standpipe or riser / feedmain line.
  8. GeorgeMech

    Wet standpipe and Dry standpipe together?

    NFPA 101 states that if the habitable height is more than 23m (High Rise Building), automatic wet standpipe shall be used and as per above post, you have to check again your calculation on how did you arrived in 1750 gpm demand, in your case you need only 1000 gpm since you also have sprinkler...
  9. GeorgeMech

    electrical room protection

    First you have to make sure that all the requirement of NFPA (as mentioned above) regarding on the exclusion of sprinkler protection are ALL met, it is not only about 2 hours fire rating but ALL the above condition shall be met and because if not, you have to protect it with sprinkler system...
  10. GeorgeMech

    Flexible Coupling

    Thanks for the reply. First, our building is not under the seismic application with reference to the IBC code so that is why we did not used any sway brace in our piping and so I insisted to the Engineer that this flexible coupling attached to the piping (whenever pipe is passing through...
  11. GeorgeMech

    Disel Pump Pad

    For the foundation design you may use 3-5 times the weight of the pump&diesel engine as a rule of thumb if no structural engineer is available, however, if you want a conservative way of sizing the pump foundation you need to consult a civil / structural engineer. J bolts can be used for...
  12. GeorgeMech

    Advice on Pump Suction Line

    For sure it will cause an air entrapment at the highest point, so better to put air release valve at the offset point.
  13. GeorgeMech

    Fire Water Tank

    your proposal is acceptable by NFPA related standard, however, it should be noted that in case you want this kind of set up, you need to consider the net effective capacity of the tank which can be calculated as per the most demanding system and as per the applicable duration, also, you should...
  14. GeorgeMech

    NFPA 14 Standpipe Most Remote Calc

    The calculation shall be done for the most remote hose connections which includes the 2 1/2 test connection and the adjacent hose connection since this will be the basis of selecting the pump capacity if standpipe is the most demanding in your system.
  15. GeorgeMech

    Design and size firewater pump package and storage tank ( Pressure, Flow rate, storage tank size)

    And all of those who viewed his answer will got a bonus points (correct answer) for that question.
  16. GeorgeMech

    Flexible Coupling

    Hi! I have a situation where the consultant requires the system to be provided with flexible joint whenever the pipes are passing through building expansion joint, however, our building does not belong to a category that requires seismic protection, however, the consultant insist that we need...
  17. GeorgeMech

    Tank capicity

    As per NFPA 14, the demand for Class II hose shall be 100 gpm, even if you have 4 nos. of hose connection, still the minimum required demand would be 100 gpm, and with the same standard, you will found out that the requirement for Hose Connection shall be 30 mins, thus, 100 gals/min x 30 mins...
  18. GeorgeMech

    Pressure of the system in Churn Pressure Condition.

    Hi, Thanks for the reply, actually I was worried only about the location of the PRV on the sprinkler system since my pipes, fittings, valves,etc are having a rated pressure of 12.1 bar (175 psi) only, but after I determine the location PRV for each floor per each building, I will run the...
  19. GeorgeMech

    Closed Piping

    thanks littleinch, im worried that i need to consider friction loss in the system, however it is very clear that since there is no flow so velocity is zero and thus, no friction loss in the system even the piping is 1000m away from the pump discharge (without ups and downs).
  20. GeorgeMech

    Pressure of the system in Churn Pressure Condition.

    Hi, I have a simple problem but I don’t know if I'm using the correct formula or procedure. I have a fire pump rated at 14 bar with a churn pressure of 16 bar, the consultant wants to give the pressure at each tapping point for each building (16 buildings in site), the piping runs straight from...

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