METHOD FOR EVALUATING CONNECTION STATE OF PIPE THREAD COUPLING, METHOD FOR PIPE THREAD COUPLING CONNECTION, AND DEVICE FOR EVALUATING CONNECTION STATE OF PIPE THREAD COUPLING

WIPO Patent Application WO/2010/113651

A1

Disclosed is a method which can evaluate the connection state of the shoulder portion of a screw coupling used as a coupling in pipes such as oil well pipes, where said evaluation occurs during or after connection in a simple and precise manner. The method for evaluating the connection state of a pipe thread coupling (100) is characterized by transmitting an ultrasound surface wave from the inner surface of either a pin (1) or a box (2), across the shoulder portion (13, 23) of the pin (1) or box (2), towards the inner surface of whichever of the pin (1) or box (2) which is not where the surface wave originates, and determining the quality of the connection state of the pipe thread coupling (100) based on the strength of the transmitted wave or the strength of the reflected wave.

HOSHINO IKUJI (JP)
YAMANO MASAKI (JP)
SAKAMOTO MAKOTO (JP)
NAKAMURA KEIICHI (JP)
MASUBUCHI JUN (JP)
SAKAI KENTA (JP)

PCT/JP2010/054624

October 07, 2010

March 18, 2010

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SUMITOMO METAL IND (JP)
HOSHINO IKUJI (JP)
YAMANO MASAKI (JP)
SAKAMOTO MAKOTO (JP)
NAKAMURA KEIICHI (JP)
MASUBUCHI JUN (JP)
SAKAI KENTA (JP)

G01N29/00; F16L15/04; G01N29/04

JP2008089568A	2008-04-17
JPH03183944A	1991-08-09
JPS5720660A	1982-02-03
JPS4984294A	1974-08-13
JPH03272456A	1991-12-04
JPH04265855A	1992-09-22
JP2003227816A	2003-08-15

None
See also references of EP 2416149A4

OHNAKA Minoru (JP)
Minoru Onaka (JP)

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