The AFT Fathom GSC module allows an input parameter to be automatically varied until a desired goal is reached.

This is where using the AFT Fathom GSC (Goal Seek & Control) module is extremely helpful! So in Figure 2 above, even though J17 appears to be the furthest away from the supply pressure, it may not have the most hydraulic resistance in that flow path. The reason why you will need to create a group is because the NFPA code requires the report to document the hydraulic calculations for the spray nozzle that is the hydraulically most remote from the supply in a continuous flow path.īut here lies the issue.Sometimes, (probably most of the time), it is not very easy to determine which spray nozzle is hydraulically the most remote nozzle. After the system is built and all the pipe and junction input is fully defined, you will need to create at least one group for your NFPA analysis. The fittings in the system can be defined with either standard K factors or with equivalent length methods. Next, you can build a simple spray system like that in Figure 2. In order to perform these calculations, you will first need to turn on the NFPA reporting with the User Options in the Tools menu, as shown in Figure 1. But now with AFT Fathom 9, you can easily generate the specific NFPA report that is required by the standard directly within AFT Fathom. AFT Fathom has been able to perform all the standard hydraulic calculations for a fire protection analysis for a long time, including the usage of Hazen-Williams factors. NFPA 15 is the standard for fixed water spray systems that are used in fire protection. The good news is that you can streamline the calculations outlined in the codes with AFT Fathom! If you are performing a hydraulic analysis on your fire system, chances are high that you are working hard and maybe scratching your head in order to adhere to the NFPA codes.

Hass fire sprinkler calculation