* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * HAZARD ALERT * * * * Produced by: Saskatchewan Human Resources, * * Labour and Employment * * Provided by: Canadian Centre for Occupational Health and Safety * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * SERVICE RIG DERRICK COLLAPSES WHEN STRUCK BY TRAVELLING BLOCKS *** FATALITY: *** A service rig derrick hand was killed when the derrick he was working in buckled and collapsed. *** CIRCUMSTANCES: *** The rig crew was involved in pulling tubing from the well bore. Approximately 20 stands had been racked into the derrick. The derrick hand was working from the tubing board and was secured by his safety belt and lanyard. The travelling blocks were hoisting the tubing when they passed by the tubing board and struck the derrick crown. The derrick buckled and collapsed, killing the worker instantly. *** PREVENTION: *** In order to prevent this and other types of accidents, 'The Occupational Health and Safety Regulations', section 213 requires that an employer shall: a) develop and implement safe work procedures for hoist operations (for example, the safe hoisting of tubing); and b) ensure that designated operators are competent and throughtly instructed in these procedures. Section 338, requires that an upward travel limit device, or crown saver, be used on all triple stand derricks to disengage the power to the hoisting drum and apply the brakes. The use of this device is not presently required on service rigs. However, industry and branch officials have concluded that if a crown saver had been installed on this rig, the accident could have been prevented. Hazard Alert 1, August 1990 * * * * * * * * * * * * * * * * * * * * * * * *