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Refer to local codes and appropriate ASME Boiler 

and Pressure Vessel Code for additional installation 

requirements.

Install relief valve on 3/4” pipe nipple in tapped boiler 

opening.  
A.  Pipe discharge line following guidelines in preceding 

Warning. See Figure 2.  

B.  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.                                                          

C.  Discharge line shall terminate with plain end to 

atmosphere where any discharge will be clearly 

visible and is at no risk of freezing.                                

D.  Discharge line shall be independently supported to 

avoid  applied  stress  on  relief  valve.                                                  

E.  Installation shall allow complete drainage of relief 

valve and discharge line. 

Install Drain Valve on lower left side of boiler as 

marked. 

Install Temperature and Pressure Gauge into ¼” 

bushing threaded in tee furnished with supply piping. 

See Figures 3 and 4.

Connect Supply and Return Lines to boiler. Figure 3 & 

4. Connections may require certain additional fi ttings 

and parts.

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; or greater.

Refer to local codes and appropriate ANSI/ASME Boiler and Pressure Vessel Code, Section IV, or Boiler, 

Pressure Vessel and Pressure Piping Code, CSA B51 for additional installation requirements.

   

Check local codes 

for maximum 

distance from 

fl oor or other 

allowable safe 

point of discharge