What about about your analyze on rest of items abs below: - Actually this is for a big deluge system, not sprinkler system, I mistyped sprinkler system in my previous email. Let me ask my question in another way. I want to asume 3 scenarios for selecting fire pumps for a water demand of 3900 GPM at 90 Psi. 1- Want to be economical and and I don't afford to buy reserve pumps: (is it allowed as per NFPA not to have reserve pumps)? 1-1: I have a very reliable power source: I will buy only an electric driven main fire pump 3500GPM at 102 psi working at about 112% of rated capasity ( I won't buy diesel, because I have a reliable power source and also I want to be economical) 1-2:I doN't have a reliable power source: I will buy only a diesel fire pump 3500GPM at 102 psi to work as my main fire pump. 2- have too much money, I will buy reserve pumps: 2-1: I will buy a main electric pump 3500GPM at 102 psi and a diesel pump 3500GPM at 102 psi and my eletric fire pump would be main pump and diesel pump would be reserve pump which will work at power failure conditions. 2-2: is above arrangement as per NFPA? or I should arrange diesel pump as main? 3- Want to be very very economical: I don't want to buy expensive pumps like Pattreson, Peerless, ... who are producing big pumps, I want to be very economical and buy the cheap pumps from my supplier who can't make a 3500 GPM pump, so I have to split the pumps and buy two sets of 1500 GPM at 129 psi working at about 130% or rated capacity. 3-1: I have a very reliable power source: I will buy 2 electric pumps each 1500 GPM at 129 psi working as main pumps. 3-2: I doN't have a reliable power source: I will buy 2 diesel pumps each 1500 GPM at 129 psi working as main pumps. 3-3: I am not 100% sure about reliability of power source: I will buy one electric pumps and one diesel pump at the same capacity of 1500 GPM at 129 psi, electric pump will start first and when water demand exceeds than 1500 GPM, then diesel pump will start, this arrangement is because in case of power failure, I can supply at least 50% of water demand to control half of fire. I know this is not logical, but imagine that power failure possibility is less than 1%.
Would you kindly please analyze these three scenarios and let me know if any of them is aganist NFPA? If you have to choose one economical choice (among item 1) and one non economical choice (among item 2), and one very economical choice (among item 3), which ones you will choose? Many thanks for your kind help in advance. Thank, Reza Tom Duross <[EMAIL PROTECTED]> wrote: Why stop there? Tom GRS How can you control half of fire with a deluge system? You should eliminate 3-3 entirely from your list of options. It is not logical and would not meet NFPA either if your deluge system demand is based on application of NFPA criteria. Bill Brooks Pittsburgh, PA 3-3: I am not 100% sure about reliability of power source: I will buy one electric pumps and one diesel pump at the same capacity of 1500 GPM at 129 psi, electric pump will start first and when water demand exceeds than 1500 GPM, then diesel pump will start, this arrangement is because in case of power failure, I can supply at least 50% of water demand to control half of fire. I know this is not logical, but imagine that power failure possibility is less than 1%. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) --------------------------------- Shape Yahoo! in your own image. Join our Network Research Panel today! _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
