(a)

1. (1) Each boiler shall have a steam gauge connected to the steam space or to the water column or its steam connection.
2. (2) The steam gauge shall be connected to a syphon or equivalent device of sufficient capacity to keep the gauge tube filled with water and so arranged that the gauge cannot be shut off from the boiler except by a cock placed near the gauge and provided with a tee or level handle arranged to be parallel to the pipe in which it is located when the cock is open.
3. (3) For boilers carrying five hundred pounds (500 lbs.) pressure or over, valves may be used in place of cocks.
4. (4) Gauge connections which are filled with water at a temperature never greater than that of saturated steam at a pressure of two hundred fifty pounds per square inch (250 psi) or four hundred sixty degrees Fahrenheit (460° F) shall be of brass, copper, bronze, or other noncorrosive composition suitable for the pressure and temperature conditions.
5. (5) Connections that are filled with steam or water of a temperature greater than that of saturated steam at a pressure of two hundred fifty pounds per square inch (250 psi) or four hundred sixty degrees Fahrenheit (460° F) shall be of steel pipe or of other material capable of safely withstanding the temperatures corresponding to the maximum allowable working pressure.
6. (6) Where steel or wrought iron pipe connections are used, they shall be not less than one-inch pipe size.

(c)

1. (1) Where the use of a pipe longer than ten feet (10’) becomes necessary, an exception may be made to the rule that the gauge must be arranged so that it cannot be shut off except by a cock placed near the gauge, and a shutoff valve or cock arranged so that it can be locked or sealed open may be used near the boiler.
2. (2) Such a pipe shall be of ample size and arrangement so that it may be cleared by blowing out.