![]() Modified Drill collars with 18° shoulder Requirements for visual, dimensional and thickness checks No Specification Drill Collars modified for use with drill pipe elevators and not lift subs. Used for many years by Halliburton UK with proven results for acme connections. No specification Provides a much more consistent inspection of connections and proven results above those of dye penetrant by one UK operator. Unengaged threads are the prime notch for fatigue crack initiation. ![]() Stress Relief Groove (SRG) Width 1” ± 1/32" 3/4" -1/32" toġ” + 1/32” A 3/4" stress relief feature will normally mean that the connection has at least 1 unengaged thread. ![]() Thread surface acceptance criteria same as NS-2 Otherwise pitting is acceptable provided it does not exceed 1/16 inch in depth or 1/8 in diameter or occupy more than 1 ½ inchĪlong thread helix Thread roots shall be free of all pitting Thread roots of the loaded threads 2 inches from shoulders shall be free of pitting. Seal face DamageĒ5% 20%ğor the purposes of drill string seal widths the difference is negligible.
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