2.7 PRESSURE RELIEF VALVE INSTALLATION
An ASME rated Pressure Relief Valve is supplied with each Benchmark Boiler (BMK5000 and
6000 boilers are supplied with one or more valves, depending on the pressure required). The
pressure rating for the relief valve must be specified on the sales order. Available pressure
ratings range from 30 to 160 psi (207 to 1103 kPa). The relief valve is installed on the hot water
outlet of the boiler as shown in Figure 2-5a – 2-5c. A suitable pipe joint compound should be
used on the threaded connections. Any excess should be wiped off to avoid getting any joint
compound into the valve body. The relief valve must be piped to within 12 inches (30.5 cm) of
the floor to prevent injury in the event of a discharge. No valves, restrictions, or other blockages
are allowed in the full port discharge line. In multiple unit installations the discharge lines must
NOT be manifolded together. Each must be individually run to a suitable discharge location.
Figure 2-5a: BMK750/1000 P&T Relief Valve Location
Figure 2-5b: BMK1500 – 4000 P&T Relief Valve Location
Figure 2-5c. BMK5000 – 6000 P&T Relief Valve Location
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