Hammer union mismatches threaten wellsite personnel

07/17/2000
Click here to enlarge imageFatalities, injuries, near misses, and uncontrolled releases of potentially hazardous fluid may result when two of the most widely used high-pressure hammer unions are accidentally mated. Click here to enlarge imageThe tools in question are the 2-in. Figure 602 (6,000-psi rating), and the 2-in. Figure 1502 (15,000 psi; Figs. 1-3). Click here to enlarge imageAdditionally, two other less commonly used hammer unions, the 2-in. Figure 1002 (10,000 psi) and Guiberson thread halves, can be cross-matched as well.Mismatched hammer unions that have been pressurized can lead to an:8 lb wing-nut projectile that can be propelled in any direction.Uncontrolled release of ...
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