229 Neb. Admin. Code, ch. 21, § 013
The minimum safety valve or safety-relief relieving capacity shall be determined on the basis of maximum designed steaming capacity determined by the boiler manufacturer or by the pounds of steam generated per hour per square foot of boiler heating surface and water-wall heating surface as given in Table A. This method shall not be used on electric boilers, waste heat boilers, or forced-flow steam generators without a fixed steam and water line.
Minimum Pounds of Steam Per Hour, Per Square Foot of Heating Surface
Boiler Heating Surfaces | ||
Firetube Boilers: | Watertube Boilers: | |
Hand Fired | 5 | 6 |
Stoker Fired | 7 | 8 |
Oil, Gas or Pulverized Fuel Fired | 8 | 10 |
Water Wall Heating Surfaces | ||
Firetube Boilers: | Watertube Boilers: | |
Hand Fired | 8 | 8 |
Stoker Fired | 10 | 12 |
Oil, Gas or Pulverized Fuel Fired | 14 | 16 |
ASME Boiler & Pressure Vessel Code
229 Neb. Admin. Code, ch. 21, § 013