SFMC 2 1/2 SQUARE KELLYs are made from AISI 4145H modified alloy steel in accordance with API Spec. 7-1 latest edition, which are quenched and tempered along full length. A hardnedd range of 285 to 341 BHN and a minimum impact value of 54 Joules as per ASTM A 370 Charpy-V, these values are guaranteed one inch below the surface. SFMC Kelly bars are inspected by an ultrasonic unit over their full length and full section. The wall thickness of each flat of the drive section is verified ultrasonically. All kellys’ connection are fitted with pressed steel thread protectors on both ends and each kellys would be shipped with steel scabbard for marine transportation.
Nom size (in) | Lengths(ft) | Top upset joint | Bottom upset | Bore | Drive section | Weight(kg) | |||||||
standard | optional | ||||||||||||
A | B | LH connection | OD C | LH connection | OD C | RH connection | OD D | E | F | G | Sta | Opt | |
(in) | (in) | (in) | (in) | (in) | (in) | ||||||||
2 1/2 | 40 46 | 37 43 | 6 5/8 Reg | 7 3/4 | 4 1/2 Reg | 5 3/4 | NC26 (2 3/8 IF) |
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3 | 40 46 | 37 43 | 6 5/8 Reg | 7 3/4 | 4 1/2 Reg | 5 3/4 | NC26 (2 3/8 IF) |
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3 1/2 | 40 46 54 | 37 43 51 | 6 5/8 Reg | 7 3/4 | 4 1/2 Reg | 5 3/4 | NC26 (2 3/8 IF) |
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4 1/4 | 40 46 54 | 37 43 51 | 6 5/8 Reg | 7 3/4 | 4 1/2 Reg | 5 3/4 | NC46(4IF) or NC50(4 1/2IF) |
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5 1/4 | 40 46 54 | 37 43 51 | 6 5/8 Reg | 7 3/4 | -- | -- | NC50 or 51/2FH or NC56 |
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6 | 40 46 54 | 37 43 51 | 6 5/8 Reg | 7 3/4 | -- | -- | 6 5/8 FH |
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