Columbia CSC SERIES Installation, Operation & Maintenance Manual page 41

Relief Valve and Discharge Line Piping Installation
Install relief valve on pipe nipple in tapped boiler opening.
Pipe discharge line following guidelines in preceding
Warning. Refer to examples shown in Figures 1 & 2.
Discharge line pipe size shall be equal or greater than that
of relief valve outlet over entire length of discharge line
with no intervening shutoff valve between safety relief
valve and discharge to atmosphere.
Discharge line shall terminate with plain end (not threaded)
to atmosphere where any discharge will be clearly visible
and is at no risk of freezing.
Figure 1
RELIEF VALVE
DISCHARGE
LINE
Check local
codes for
maximum
distance
from floor
or allowable
safe point of
discharge .
SUPPLEMENTAL INSTRUCTIONS
Discharge line shall be independently supported to avoid
applied stress on relief valve. Installation shall allow
complete drainage of relief valve and discharge line.
Discharge line shall be as short and straight as possible
and constructed of material suitable for exposure to
temperatures of 375° F, or greater.
Refer to local codes and appropriate ASME Boiler
and Pressure Vessel Code for additional installation
requirements.
Figure 2
41
RELIEF VALVE
P/N #240008309, REV A [12/2009]
DISCHARGE
LINE
Check local
codes for
maximum
distance
from floor
or allowable
safe point of
discharge .