These basic procedures can also be used for calculating many other types of systems such as fire hydrant, hose reel or the discharge from a water cannon or monitor we can also use the same principal for almost all other water-based fire protection systems if we have a k-factor for the output device (fire sprinkler, water mist nozzle and so on).A tree system is end feed, that is water is only fed from one direction as opposed to a grid or loop system when water may arrive at the sprinkler head from more than one direction.We have dimensioned the pipe lengths and given each junction point a unique node reference number which we use throughout the calculations.
We can also see that the minimum sprinkler pressure of 0.5 bar is not sufficient to produce the required flow rate so the next step will be to determine what pressure will be required to produce the required flow of 76.50 Lmin at the first sprinkler head at node 130 we can do this by using equation 3. As the pipe has an internal diameter of 27.30 mm and has a C value of 120 this will give us. We now add this flow to the flow in the seconded pipe 120-110 to find the total flow in the third pipe 110-100 which will give us the flow of 244.20 Lmin. However, the last pipe has an internal diameter of 36.0 mm so this gives us. By continuing to browse the site you are agreeing to our use of cookies in accordance with our Cookie Policy. There are similarities to the NFPA Fire Protection Handbook, but also important differences. The FM handbook focuses on property protection and takes more of an engineering approach to loss prevention. Fire Sprinkler Hydraulic Calculation Trial Processes AndTopics run the gamut and include building fire protection features, as well as a wide range of industrial processes and industrial hazards. Note that hydraulically calculated sprinkler systems did not appear in NFPA 13 until the 1972 edition. Fire Sprinkler Hydraulic Calculation Plus This RiserThen one accounts for the friction loss and elevation between the feed main connection to the cross main and the water supply source, plus this riser pressure resulting in sprinkler flow and pressure demand. ![]() This chapter indicates there should be a primary sprinkler demand and a total sprinkler demand. Depending on the severity of the hazard, the primary sprinkler demand will be in the range of 50 to 100 percent of the total sprinkler demand (based on the total number of sprinklers expected to operate). Then estimate the total sprinkler demand from the ranges listed in Table 12-2. Note that the figure indicates this flow is equivalent to approximately 53 sprinklers in operation. For drum storage of flammable (Class I) and combustible (Class 2) liquids, densities in the range of 0.30 to 0.66 gpmsq. The handbook goes on to recommend that the water supply be based on the operation of all sprinklers in the area. Table 66-1 lists densities for various storage arrangements of rubber tires, ranging from 0.27 to 0.60 gpmsq. This initial supply is based on either 15 or 20 operating sprinklers and must be provided for at least one hour. For the total sprinkler demand, one is referred to Chapter 12. I suppose where rubber tires are concerned, if the initial demand is inadequate that we cross our fingers. In browsing through the pages of the handbook, it is possible to get a glimpse of the basis for many of the things we still do today.
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