Torqued drill pipe identification

Details Torqued drill pipe identification Torqued drill pipe identification

1980-05-30

1982-03-02

Callaghan, Thomas F.

Pipe joints or couplings

With indicator, alarm or inspection means

116212, 116DIG21, 285333, F16L 1500

Patent

active

043175856

ABSTRACT:
Suitable marks on protected places at opposite ends of a drill pipe make it possible to inspect the pipe after it has been used in a drill string to determine whether it has been subjected to excessive torque in the course of its previous use, so that it should not be used again in a new string. This reduces the risk of any pipe breaking in the new string, which would cause great trouble and expense.

REFERENCES:
patent: 233712 (1880-10-01), Thurston
patent: 1606941 (1926-11-01), Holman
patent: 2029798 (1936-02-01), Schellin
patent: 2454850 (1948-11-01), Van Winkle et al.
patent: 2772899 (1956-12-01), Evans
patent: 3468563 (1969-09-01), Duret
patent: 4127927 (1978-12-01), Hauk et al.
patent: 4154466 (1979-05-01), Simmons

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