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  1. C

    Fire Hydrant

    Hello everyone Regarding a project of mine, the general contractor intends to install the control valve below the fire hydrant（wet barrel） as shown in the picture. I would like to know if this is correct. Additionally, how should the coverage area of the fire hydrants be considered? Advance Thanks！
  2. C

    Clean Agent System

    Dear friend The fire - extinguishing concentration of FM - certified products varies among different manufacturers. You can query it on the FM Approvals website. For the FM200 system, I have consulted several manufacturers before, and they all said that they don't have the combined distribution...
  3. C

    Clean Agent System

    Hello Cdafd Thank you very much for your reply. 1. I'm still a bit confused. Since they are all Class C fires, the fire extinguishing concentrations of IG541 systems certified by FM from different manufacturers are different, such as 38.6, 39.89... However, the certified fire extinguishing...
  4. C

    Clean Agent System

    Dear Everyone I‘m sorry. I have been puzzled by two questions regarding the gas fire extinguishing system. I have checked both the NFPA and FM standards, but there is no clear answer. I hope someone can provide an explanation. 1. Why is it that the certified fire extinguishing concentrations...
  5. C

    fire water demand

    I am mainly engaged in the fire protection design of power plants. According to NFPA 850, the water supply demand is calculated by adding 500 gpm to the flow rate of the largest system. However, this is a steel mill, and I haven't found the specific requirements of NFPA for it.
  6. C

    fire water demand

    soory，you mean to determine the flow rate of the fire pump based on this?
  7. C

    fire water demand

    No, it's just that the construction has just started, but now we need to select the specifications of the fire pump. I haven't found any instructions on how to calculate the flow rate of the fire pump in NFPA. I'm very anxious and hope to get some help.Thanks a lot.
  8. C

    fire water demand

    I'm very sorry. After reading NFPA 1, I feel that it doesn't clearly specify this. Maybe I just didn't notice it. Could you give me some more hints? Thank you.
  9. C

    fire water demand

    hi everyone I have a newly built steel plant building equipped with standpipe system、automatic sprinkler system, and outdoor fire hydrant system. How should I determine the maximum water demand of this building? Should I add up the water demand of each system? Especially, how to determine the...
  10. C

    ASME B16.11&B16.5

    Thank you very much for your reply. I have a poor understanding of the ASME standard. I would like to ask if there is a flange equivalent to the Class 3000 socket - welding fitting. As I know, the highest Class rating for flanges is only 2500.
  11. C

    ASME B16.11&B16.5

    HI Everyone For my project, the pipe fittings provided by the gas suppression manufacturer are socket-welded ones of Class 3000. However, the client requires me to change them to flanged ones. So, what Class should I choose for the flanges? The maximum operating pressure of the system is 6 MPa...
  12. C

    NFPA2001 GAS SUPPRESSION SYSTEM

    The protected zone is rather diminutive, merely covering an area of approximately 20 square meters. The property owner has come up with a host of peculiar inquiries. Notably, he intends to install a combined FM200 system, which functions in a manner akin to the IG541 system. That is to say, with...
  13. C

    NFPA2001 GAS SUPPRESSION SYSTEM

    The owner, a Turkish man, hopes that when there are people working in the protected area, the gas fire - extinguishing system can be switched to the manual mode via the manual - automatic switching device. This measure is to ensure that the gas fire - extinguishing system won't malfunction while...
  14. C

    NFPA2001 GAS SUPPRESSION SYSTEM

    Thank you very much for your reply. My owner has installed a set of FM200 in the control room. Since there are always people in the control room, they are worried that the automatic spraying might harm the personnel. Therefore, they want to install a manual/automatic switching device. As far as...
  15. C

    NFPA2001 GAS SUPPRESSION SYSTEM

    Hello. I've got a question here. In accordance with the NFPA requirements, is it necessary for a gas fire extinguishing system to be furnished with a manual/automatic switching device? And does the sole manual release （Electrical Manual Release and Mechanical Manual Release）method fulfill the...
  16. C

    seamless and welded pipe

    hi everyone I have to choose pipe welded or seamless ，I want to know when to choose seamless or welded pipe.Are there any pressure or other restrictions on seamless pipes and welded pipes? thanks
  17. C

    Corrosion resistant piping

    So what anti-corrosion coating should be used? thanks
  18. C

    Corrosion resistant piping

    hi everyone I am designing a fire extinguishing system. OE requires that all galvanized pipes must be painted with anti-corrosion paint. Are there any relevant requirements for this from NFPA or ASTM? At the same time, I would like to ask, is there a maximum size limit for grooved pipe fittings...

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