2022 Manitoba Workplace Safety and Health Act and Regulation

General requirements for rig
41.4
An employer must ensure that a rig and all of its components
are designed, constructed, installed, inspected, maintained and
operated in accordance with the manufacturer’s specifications or the
specifications certified by a professional engineer.
Maximum safe operating load limit
41.5(1) An employer must ensure that the maximum safe operating load of a
derrick or mast — as specified by the manufacturer or a professional
engineer — is prominently displayed at the derrick or mast site.
41.5(2) An employer must ensure that the maximum safe operating load of a
derrick or mast is not exceeded.
Structural modification or repair
41.6
If a structural modification or repair is made to a derrick or mast, an
employer must ensure that
(a) the modification or repair is certified by a professional engineer;
(b) the maximum safe operating load of the derrick or mast is
determined and certified by a professional engineer; and
(c) the load marking at the derrick or mast site is replaced if the
maximum safe operating load is changed.

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Workplace Safety And Health Regulation
337
Supervisor must be present
41.7
An employer must ensure that a supervisor is present at a derrick site
whenever the derrick is raised or lowered.
Rig sites and foundations
41.8
An employer must ensure that
(a) the site of a rig is constructed and maintained so that oil, water,
drilling fluid or other fluids will drain away from the wellbore;
and
(b) the foundation of a rig is capable of safely supporting the gross
weight of the derrick under the maximum anticipated load and
any load imposed on it when a derrick is raised or lowered.