DESIGN
§ 29.181. All installations.
(a) Guarding. Engines shall have all exposed wheels, pulleys, gears, clutches, couplings, collars, belts, shafting, keys and set screws guarded as specified in Subchapter C (relating to mechanical power transmission apparatus).
(b) Safety valves. Receivers between high presure and intermediate and low pressure cylinders shall be protected by one or more safety valves of sufficient capacity adjusted to release at the maximum safe working pressure of such receivers. Relieving capacity of the safety valve shall be not less than the capacity of the live steam connection to such receivers.
(c) Pressure gauges. Receivers shall be provided with pressure gauges.
(d) Separators. Effective separators or ample drains shall be provided in the main steam line above the throttle.
(e) Vacuum breaker. The jet condenser shall be provided with an automatic vacuum breaker to prevent water from entering the engine cylinders.
(f) Speed limit. Engines of 300 horsepower or more shall be equipped with an approved automatic independent, speed limit device. This requirement does not apply to a reversing engine connected by shafting, couplings, or gears to a constant load.
(g) Governor. Each engine shall be equipped with an effective governor, which at all times automatically controls the speed of the engine, except when the load itself acts as an effective governor. Fly-ball governors shall be equipped with an automatic stop to shut off the supply of steam in the event of derangement of the governor.
(h) Valve gears and belt stop. Valve gears of engines not controlled by fly-ball governors shall be so arranged, or other provisions made, that when the load is removed, the engine stops if the governor fails to function. A broken belt stop is considered sufficient for slide or four valve engines.
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