OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 37 Oil and Gas Wells

Section 753 Operating load of derrick or mast

Subsection 753(1)

Drillers must know the limitations of the derrick being used. Weights of objects being lifted must be known.

Exceeding the safe operating load, also known as “derrick lift capacity”, increases the possibility of equipment failure through overloading. The derrick or mast manufacturer should specify

(a) the maximum hook load,
(b) the increased dead-load and wind induced load due to accumulation of ice and snow,
(c) the maximum loading due to fastener prestress,
(d) the maximum setback load such as amount of pipe the rig floor will hold, and
(e) the maximum wind speed at which operations will be conducted.

Subsection 753(2)

Repairs must be made only with manufacturer approved and specified materials or as certified by a professional engineer.