§ 29.131. Prime movers.
(a) Flywheels. Flywheels located so that any part is 6 feet or less above floor or platform shall be guarded in one of the following ways:
(1) With an enclosure of sheet, perforated or expanded metal, or woven wire.
(2) With guardrails placed not less than 15 inches or not more than 20 inches from the rim. When the flywheel extends into a pit or is within 12 inches of the floor, a standard toeboard shall be provided.
(3) When the upper rim of a flywheel protrudes through a working floor it shall be entirely enclosed or surrounded by a guardrail and toeboard.
(4) For flywheels with smooth rims five or less feet in diameter, when the preceding methods cannot be applied, a disc attached to the flywheel in such manner as to cover the spokes of the wheel on the exposed side and present a smooth surface and edge, at the same time providing means for periodic inspection. An open width may be left between the outer edge of the disc and the rim of the wheel if desired to facilitate turning the wheel over. When a disc is used the keys or other dangerous projections not covered by the disc shall be cut off or covered.
(5) An adjustable guard to be used for starting the engine or for running adjustments may be provided at the flywheel of gas or oil engines. A slot opening for the jack bar is permitted. This does not apply to flywheels with solid web centers.
(b) Crank and connecting rods. Crank and connecting rods when exposed to contact shall be guarded.
(c) Tail rods. Tail rods or extension piston rods shall be guarded by a complete enclosure or by a guardrail on the sides and the end with a clearance of not less than 15 inches when the rod is fully extended.
(d) Governor balls. Governor balls 6 feet or less from the floor or working platform, when exposed to contact shall be provided with an enclosure extending to the top of the governor balls when at its highest position.
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