Hammer union mismatches threaten wellsite personnel

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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