Lennox International Inc. Gas-Fired Hot Water Boiler 用户手册

7

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 fl oor 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.