9
4 - CONNECTING SUPPLY & RETURN PIPING
Figure 4-1 - Safety Relief Valve
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions. Failure
to follow these instructions could result in death or
serious injury.
!
4.2 Safety Relief Valve Installation
See Figure 4-1
4.1 Connection Locations
• Boiler has one supply and one return tapping on each
side (4 total). Boiler supplied with dust caps only.
Remove all four (4) caps and plumb before filling boiler
with water.
• Supply and return may be piped to either side of
boiler, as desired.
•
Drain valve may be located off of unused return
tapping, as desired.
•
ASME relief valve may be located off unused
supply tapping IN UPRIGHT POSITION ONLY
.
• Unused supply and return tappings may be capped, as
desired. Relief valve and drain valve may be located
on near boiler piping using contractor supplied tees
with no valves.
Check local codes
for maximum
distance from floor
or allowable safe
point of discharge.
Discharge Line
Safety Relief Valve
Discharge line shall be installed to relief valve outlet
connection to avoid burns, scalding, or water damage due
to discharge of steam and/or hot water during operation.
Discharge line shall:
A. connect to relief valve outlet and piped down to safe
point of disposal. Check local codes for maximum
distance from floor or allowable safe point of
discharge.
B. be of pipe size equal to or greater than that of
the relief valve outlet over the entire length of
discharge line;
C.
have no intervening shutoff valve between safety
relief valve and discharge to atmosphere (do not
plug or place any obstruction in discharge line.
D. terminate freely to atmosphere where any discharge
will be clearly visible and at no risk of freezing;
E. allow complete drainage of the valve and the
discharge line;
F. be independently supported and securely anchored
to avoid applied stress on the relief valve;
G. be as short and straight as possible;
H. terminate with plain end (not threaded);
I. be constructed of material suitable for exposure to
temperatures of 375° F (191°C); or greater.
Refer to local codes and appropriate ASME Boiler
and Pressure Vessel Code for additional installation
requirements.
WARNING
Burn and scald hazard. Safety relief valve shall be
installed with spindle in
upright position only
,
following ASME BPV code. Failure to follow these
instructions could result in death or serious injury.
!
Alternate Location
Piped in Supply Line
(Contractor Supplied
Fittings)
Do Not Install
Pressure
Relief Valve
Horizontally
PN 240012809, Rev. C [11/15/2020]
