TM 10-4320-303-132.3.1.9 DetermineLocationofPressure-ReducingValveAssembly.(Continued)j. Using formula provided below, determine existing psi at hill crest:150 psi - psi of friction loss = psi at hill crest(150 psi = pumping station discharge pressure)k. Using formula provided below, determine allowed additional psi before safety limit is reached:225 psi - psi at hill crest = Allowed additional psi before reaching safety limit(225 psi = safety limit pressure)l. Using formula provided below, convert allowed additional psi into vertical feet:Allowed additional psi x 2.31 = Allowed additional vertical footage before reaching safety limit(2.31 psi = vertical footage conversion factor)m. Using formula provided below, determine point at which pressure-reducing valve assembly must beinstalled in hoseline:Altitude at-Allowed additional= Pressure-reducing valvehill crestvertical footageassembly installationpointif elevation continues to drop excessively beyond first pressure-reducing valve assembly installation point, asecond pressure-reducing valve assembly must be installed in hoseline. Using formula provided below,determine point at which next pressure-reducing valve assembly must be installed in hoseline:altitude at first pressure-Second pressure-reducing valve assembly -346.5 = reducing valve assemblyinstallation point installation point(346.5 = allowed additional vertical footage before reaching safety limit)2.3.2 GroovedPipeCouplingRemovalandInstallation .Remove and install grooved pipe coupling (Figure2-12) as follows:ToolsUsedTo1-1/4, 1-1/16 inch wrench sockets andInstall 6 inch and 4 inch groovedHandle (Items 85, 86, and 146,pipe couplings.Appendix C)PersonnelTwo requiredNOTEThis is a general procedure for removal and installation of bolt secured modelgrooved pipe couplings. Follow this procedure when using a bolt secured modelgrooved pipe coupling to connect two TWDS components.2-36
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