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1 Pumping Units 11.1 WELL PUMPING UNITS 11.1.1 Electric power to the pumping unit should be deen- ergized a sufficient distance from the wellhead to eliminate potential electrical hazards during well servicing operations. In confined locations, overhead electric power to the pumping unit control panel should be deenergized. Where necessary, electric power service should be deenergized while moving the rig in or out and during rig-up and rig-down operations. 11.1.2 When well servicing operations are to be per- formed, the pumping unit should be turned off, the brake set, and where applicable, the power source locked out/tagged out.

11.1.3 If the pumping unit is stopped with counterweights in other than the down position, additional means to secure the beam to a fixed member of the pumping unit shall be used to prevent any unintended movement of the counterweights or beam. 11.1.4 Chain or wire rope sling of suitable strength should be used to handle the horsehead if removal or installation operations are necessary. On installation, the horsehead should be bolted or latched in accordance with ansi download the manufac- turer's specifications. Provided by IHS under license with API Copyright American Petroleum Institute Not for Resale, 05/04/2009 02:21:06 MDT Licensee=FMC Technologies /5914950002 RECOMMENDED PRACTICE FOR OCCUPATIONAL SAFETY FOR OIL AND GAS WELL DRILLING AND SERVICING OPERATIONS 23 11.1.5 Upon completion of well servicing operations and before energizing the power source, precautions shall be taken to ensure that all personnel and equipment are clear of the weight and beam movement. 11.1.6 Brake systems on all pumping units in service should be maintained in safe working order.

11.1.7 After well servicing operations are completed all pumping unit guards and enclosure guards (belt and motor sheaves) should be reinstalled prior to startup. Guards need not be in place until all final adjustments (pump, spacing, etc.) are made, so long as the safety of personnel is not com- promised. 12 Special Services 12.1 GENERAL 12.1.1 The supervisor of the special service should hold a pre-job me