Companies have been installing limit switch devices on their drawworks for a number of years, but we still get reports of crown damage and personal injuries resulting from the traveling block hitting the crown.
There are two types of crown safety devices. One is installed on the drawworks cover and is activated by a toggle switch when the drilling line gets to a predetermined point on the drum. The other is attached to the drawworks shaft and is activated when a predetermined number of drawworks shaft revolutions has been counted.
These shaft mounted devices can also be used to set the lowest level that blocks can be lowered or limit the traveling block movement when tools are extended and may be in the path of the blocks. The purpose of these pneumatic safety devices is to remove the power and apply the brake on the drawworks’ drum at a point that allows sufficient stopping distance to prevent the traveling block from contacting the crown.
What can be done to assure the crown protection device will work when needed?
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