Figure:16 TAC §65.615(7)

Exhibit 7

MINIMUM POUNDS OF STEAM PER HOUR
PER SQUARE FOOT (METER) OF HEATING SURFACE
  Firetube Boilers Watertube Boilers
Boiler Heating Surface    
          Hand fired 5 (24) 6 (29)
          Stoker fired 7 (34) 8 (39)
          Oil, gas or pulverized fuel
fired		 8 (39) 10 (49)
Waterwall Heating Surface    
          Hand fired 8 (39) 8 (39)
          Stoker fired 10 (49) 12 (59)
          Oil, gas, or pulverized fuel
fired		 14 (68) 16 (78)

Note: The minimum safety valve or safety relief valve relieving capacity for electric boilers
shall be 3 ½ lb/hr/kw (1.6 kg/hr/kw) input.


TABLE 2
SIZE OF BOTTOM BLOWOFF PIPING, VALVES, AND COCKS
Minimum Required
Safety Valve Capacity
lb. (kg) of Steam/Hr.		 Blowoff Piping
Valves, and Cocks
Size, min. in. (mm)
(Note)  
Up to 500 (226) ¾ (20)
501 to 1,250 (227 to 567) 1 (25)
1,251 to 2,500 (568 to 1184) 1 ¼ (32)
2,501 to 6,000 (1185 to 2721) 1 ½ (40)
6,001 (2722) and Larger 2 (50)

Note: To determine the discharge capacity of safety relief valves in terms of Btu, the relieving
capacity in lbs. of steam/hr. is multiplied by 1,000.