6 - CONNECTING SUPPLY AND RETURN PIPING
!WARNING
Burn or Scald Hazard. 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:
•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;
•be of pipe size equal to or greater than that of the relief valve outlet over the entire length of discharge line;
•have no intervening shutoff valve between safety relief valve and discharge to atmosphere (do not plug or place any obstruction in discharge line;
•terminate freely to atmosphere where any discharge will be clearly visible and at no risk of freezing;
•allow complete drainage of the valve and the discharge line;
•be independently supported and securely anchored to avoid applied stress on the relief valve;
•be as short and straight as possible;
•terminate with plain end (not threaded);
•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.
Figure 2 - Safety Relief Valve
RELIEF VALVE
DISCHARGE
LINE
Check local
codes for maximum distance from floor or allowable safe point of
discharge.
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