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Trapezoidal thread form having wear indicator and high pressure connection fitting comprising same

A wear indicator, trapezoidal thread technology, applied in threaded connections, connecting components, threaded fasteners, etc., can solve problems such as impossible to detect wear

Active Publication Date: 2013-10-23
EMERSON PROCESS MANAGEMENT REGULATOR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the nature of threaded connections, it is often difficult or impossible to detect wear
As a result, excessively worn threads may not be detected until they fail

Method used

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  • Trapezoidal thread form having wear indicator and high pressure connection fitting comprising same
  • Trapezoidal thread form having wear indicator and high pressure connection fitting comprising same
  • Trapezoidal thread form having wear indicator and high pressure connection fitting comprising same

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Embodiment Construction

[0020] This article describes various types of trapezoidal threads that include thread wear indicators. However, in other embodiments, the thread wear indicators described herein can be applied to other threaded connections, such as square and V-threads.

[0021] Thread galling in threaded connections can be an important safety concern. Overuse, abuse, and lack of adequate inspection and inspection techniques have led to an incident where premature wear of trapezoidal thread profiles, such as inch trapezoidal thread profiles, has resulted in undesired separation of fittings resulting in accidents, property damage and die. Acme threads are fairly common in the liquefied propane (LP) gas industry for fuel delivery and have recently come under scrutiny. To reduce the likelihood of failure, some refineries require that fuel transfer couplings use refinery hoses that are periodically inspected by the refinery. However, inspection methods are usually limited by natural conditions...

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Abstract

A trapezoidal thread form includes a thread having a trapezoidal cross-sectional shape, the thread including an apex surface, two side surfaces, and a valley; and a thread wear indicator formed in one of the apex surface and one of the side surfaces. The thread wear indicator may include a v-shaped channel formed in one of the apex surface and one of the side surfaces or the thread wear indicator may include a series of material layers, each layer having a physical characteristic that is different from an adjacent material layer. The thread wear indicator indicates excessive or unsafe thread wear when the v-shaped channel is indistinguishable from the apex surface or the side surface, or when a first layer wears sufficiently to show a second layer.

Description

technical field [0001] The present invention relates generally to trapezoidal thread formations and more particularly to trapezoidal thread formations with wear indicators and pressure connections including the same. Background technique [0002] Threaded connections are commonly used to join two components to each other. For example, nuts and bolts may be joined by threaded connections. Similarly, two sections of pipe may be joined by a threaded connection. A threaded connection usually consists of a male part and a female part. The male portion includes threads formed on the outer surface and the female portion includes threads formed on the inner surface. The thread includes a raised portion or ridge surrounded on either side by a concave portion or valley. The raised and recessed portions are generally helical in shape. When connected, the convex portion of the male thread is usually accommodated in the concave portion of the female thread. By screwing or rotating ...

Claims

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Application Information

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IPC IPC(8): F16B33/02
CPCF16L15/08F16L15/06F16B33/02
Inventor K·A·纳什里D·J·舍夫勒
Owner EMERSON PROCESS MANAGEMENT REGULATOR TECH INC
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