(a)
- (1) A boiler having more than five hundred square feet (500 ft2) of water heating surface shall have at least two (2) means of feeding water.
- (2) Each source of feeding shall be capable of supplying water to the boiler at a pressure of three percent (3%) higher than the highest setting of any safety valve on the boiler.
- (3) For boilers that are fired with solid fuel not in suspension, and for boilers whose setting or heat source can continue to supply sufficient heat to cause damage to the boiler if the feed supply is interrupted, one such means of feeding shall not be susceptible to the same interruption as the other, and each shall provide sufficient water to prevent damage to the boiler.
- (b) A boiler fired by gaseous, liquid, or solid fuel in suspension may be equipped with a single means of feeding water, provided means are furnished for shutting off its heat input prior to the water level reaching the lowest permissible level.