Recent content by Cris-w

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.

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

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.

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.

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...

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.

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...

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...

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...

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...

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...

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

So what anti-corrosion coating should be used? thanks

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...