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Safety Relief Valve
Installation of safety relief valve shall conform to ANSI/
ASME Boiler and Pressure Vessel Code, Section IV.
• Install furnished safety relief valve using 3/4” x 4½”
pipe provided with boiler. See Figure 8 .
• Install safety relief valve with spindle in vertical
position.
• Do not install shutoff valve between boiler and safety
relief valve.
• Install discharge piping from safety relief valve. See
Figure 8 .
• Use ¾” or larger pipe.
• Use pipe suitable for temperatures of 375°F (191°C) or
greater.
• Individual boiler discharge piping shall be independent
of other discharge piping.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Run pipe as short and straight as possible to location
protecting user from scalding and properly drain piping.
• Install union, if used, close to safety relief valve outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
Expansion Tank And Make-Up Water
Determine required system fi ll pressure, system design
temperature, and system water content.
• Boiler contains 2.6 gallons (U.S.). Size expansion tank
accordingly. Consult expansion tank manufacturer for
proper sizing information.
• Connect properly sized expansion tank (not furnished).
Diaphragm type expansion tank see Figure 9, Page 19 .
See Figure 10, Page 20 for conventional closed type
expansion tanks.
• For diaphragm type expansion tanks, adjust tank
air pressure to match system fi ll pressure. Install
furnished air vents shown for diaphragm type
expansion tank system only.
• Install make-up water connections as shown per local
codes.
• If pressure reducing valve is used, adjust to match
system fi ll pressure.
• Verify clean water supply is available. When water
supply is from well or pump, install sand strainer at
pump
Figure 8 - Relief Valve Boiler Piping
NEAR BOILER PIPING
RELIEF VALVE
DISCHARGE
LINE
Check local
codes for
maximum
distance
from fl oor
or allowable
safe point of
discharge.
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
!