US 2012/0067127 A1 · METHOD OF EVALUATING FASTENING STATE OF THREADED JOINT OF PIPES OR TUBES, METHOD FOR FASTENING THREADED JOINT OF PIPES OR TUBES, AND APPARATUS FOR EVALUATING FASTENING STATE OF THREADED JOINT OF PIPES OR TUBES

Abstract

The present invention provides a method which allows simply, easily and accurately evaluating the fastening state of shoulder parts of a threaded joint for use as a joint of pipes or tubes, such as OCTG, during fastening or after fastening. The fastening state evaluation method for a threaded joint 100 of pipes or tubes according to the present invention is characterized in that it transmits ultrasonic surface waves from the internal surface of either one of the pin 1 and the box 2 toward the internal surface of the other one of the pin 1 and the box 2 through the shoulder parts 13, 23 of the pin 1 and the box 2, and on the basis of the transmitted wave intensity or the reflected wave intensity thereof, determines whether or not the fastening state of the threaded joint 100 is satisfactory.

Claims4

Dependent claims

A method for evaluating the fastening state of a threaded joint of pipes or tubes, comprising a pin which has a shoulder part and in which an external thread part is formed, and a box which has a shoulder part buttable against the shoulder part of the pin and in which an internal thread part is formed, the external thread part of the pin being engaged with the internal thread part of the box, whereby the pin being fastened to the box,

the method comprising;
transmitting ultrasonic surface waves from the internal surface of either one of the pin and the box toward the internal surface of the other one of the pin and the box through the shoulder parts of the pin and the box;
and
on the basis of the transmitted wave intensity or the reflected wave intensity thereof, determining whether or not the fastening state of the threaded joint is satisfactory.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

13/239,610Filed 22 Sep 2011

Priority

JP 2009-08641131 Mar 2009

Published

22 Mar 2012

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

G01N 29/11
Analysing solids: by measuring attenuation of acoustic waves
F16L 15/004
With conical threads: with axial sealings having at least one plastically deformable sealing surface
F16L 2201/10
Special arrangements for pipe couplings: indicators for correct coupling
G01N 2291/02827
Material parameters: elastic parameters, strength or force

Method of evaluating fastening state of threaded joint of pipes or tubes, method for fastening threaded joint of pipes or tubes, and apparatus for evaluating fastening state of threaded joint of pipes or tubes

Life of this patent

Method of evaluating fastening state of threaded joint of pipes or tubes, method for fastening threaded joint of pipes or tubes, and apparatus for evaluating fastening state of threaded joint of pipes or tubes

Life of this patent

Abstract

Claims4