(a)

1. (1) Each boiler shall have at least one (1) water gauge glass except that boilers operated at pressures over four hundred pounds per square inch (400 psi) shall be provided with two (2) water gauge glasses which may be connected to a single water column or connected directly to the drum.
2. (2) The gauge glass connections and pipe connection shall be not less than one-half-inch pipe size.
3. (3) Each water gauge glass shall be equipped with a valved drain.

(d)

1. (1) Each water gauge glass shall be equipped with a top and a bottom shutoff valve of such through-flow construction as to prevent stoppage by deposits of sediment and to indicate by the position of the operating mechanism whether they are in operation or closed position.
2. (2) If stopcocks are used, they shall be of a type with the plug held in place by a guard or gland.
3. (3) The pressure-temperature rating shall be at least equal to that of the lowest set pressure of any safety valve on the boiler drum and the corresponding saturated steam temperature.

(e)

1. (1) Straight-run globe valves of the ordinary type shall not be used on such connection.
2. (2) Where water columns are seven feet (7’) or more above the floor level, adequate means for operating gauge cocks or blowing out the water glass must be provided.

(g)

1. (1) When shutoffs are used on the connections to a water column, they shall be either outside-screw-and-yoke or leverlifting type gate valves or stopcocks with levers permanently fastened thereto and marked in line with their passage, or of such other through-flow construction to prevent stoppage by deposits of sediment and to indicate by the position of the operating mechanism whether they are in open or closed position, and such valves or cocks shall be locked or sealed open.
2. (2) Where stopcocks are used, they shall be of a type with the plug held in place by a guard or gland.