2.6.3 BMK5000 – 6000 Supply and Return Piping
Benchmark 5000 and 6000 boilers utilizes 6” (15.24 cm) flanged fittings for the water system
supply and return piping connections. The physical location of the supply and return piping
connections are shown in Figure 2-4c.
Figure 2-4c: BMK5000-6000 Supply and Return Locations (DF Model Shown)
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.
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