Abstract: An apparatus 1 for evaluating the performance of a threaded joint for oil country tubular goods using a first steel pipe P1 and a second steel pipe P2 has a base 2 which holds a first steel pipe P1 in an upright position with an upper end of the first steel pipe P1 extending above the base and the remainder partly disposed under ground. A support member 3 mounted on the base 2 extends alongside the first steel pipe P1. A second steel pipe P2 is suspended above the first steel pipe P1 by a suspending mechanism 4. A threaded joint can be connected and disconnected by first and second tongs 5 and 6 which rotate the second steel pipe P2 with respect to the first steel pipe P1. A stabilizer 7 mounted on the support member 3 can limit the radius of gyration of the second steel pipe P2.

Abstract: An apparatus 1 for evaluating the performance of a threaded joint for oil country tubular goods using a first steel pipe P1 and a second steel pipe P2 has a base 2 which holds a first steel pipe P1 in an upright position with an upper end of the first steel pipe P1 extending above the base and the remainder partly disposed under ground. A support member 3 mounted on the base 2 extends alongside the first steel pipe P1. A second steel pipe P2 is suspended above the first steel pipe P1 by a suspending mechanism 4. A threaded joint can be connected and disconnected by first and second tongs 5 and 6 which rotate the second steel pipe P2 with respect to the first steel pipe P1. A stabilizer 7 mounted on the support member 3 can limit the radius of gyration of the second steel pipe P2.