MARKING <br />NFPA 13 and NFPA 14 require that a small sign with <br />one-inch raised letters be provided on each FDC to <br />identify the type of system (such as sprinkler, stand- <br />pipe, or combined). These are frequently cast into <br />the plate surrounding the inlets with raised letter- <br />ing. <br />Some jurisdictions require or prefer more <br />prominent marking. Larger signs can be visible to <br />firefighters and pumper drivers from farther away. <br />Icons may be provided to indicate whether the con- <br />nection feeds sprinklers, standpipes, or both. One <br />example of standard signage for this type of use <br />can be found in NFPA 170, Standard for Fire Safety <br />Symbols (Figure 5.11). Prominent signs can help <br />greatly where the FDC is on a building set back <br />from the street. Some jurisdictions require a light <br />to help identify the FDC's location in the dark. <br />Pump operators are normally trained to supply a <br />certain amount of water pressure to the FDC to <br />augment the system. For example, standard proce- <br />dure could be to pump sprinkler systems at 125 <br />pounds per square inch (psi), and standpipe sys- <br />tems at 150 psi. Firefighters may adjust this to pro- <br />vide additional pressure to a higher elevation in a <br />given building, or to account for different hose line <br />(Fig. 5.11) FDC sign with an NFPA 170 symbol for both <br />sprinkler and standpipe systems. <br />configurations on standpipe systems. When a <br />sprinkler system requires 150 psi or more to func- <br />tion properly, NFPA 13 requires that a sign indicate <br />the required pressure. Such a sign alerts the pump <br />operator to this unusual condition. <br />A designer should consider specifying additional <br />FDC signage for underground buildings or transit <br />system facilities. This is because the visual cues <br />that a pump operator typically has on aboveground <br />buildings (such as size or height), are absent. Also, <br />smoke or fire venting provides no indication about <br />the subsurface level where the fire is located. In <br />these cases, a sign indicating the maximum depth <br />and longest horizontal run of pipe gives a pump <br />operator an idea of the pressure he or she must <br />provide to reach the most remote areas of the <br />system (Figure 5.12). <br />g, <br />r n l'.g~ 114 <br />(Fig. 5.12) A nameplate on an underground transit <br />system facility, showing the depth and maximum <br />horizontal run of standpipe feed piping. <br />FIRE SERVICE FEATURES OF BUILDINGS AND FIRE PROTECTION. SYSTEMS 47 <br />163 <br />