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Dissimilar piping joint at high temperature, high pressure transient and under cyclic loading

A pipe joint, heterogeneous technology, applied in the direction of pipe/pipe joint/fitting, flange connection, engine cooling, etc., can solve the problem of reducing life expectancy and other problems

Active Publication Date: 2017-08-29
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welded connection at the steam outlet pipe 23 of the cooler 22 is a dissimilar metal joint or weld as explained above, and thus suffers from reduced lifetime issues

Method used

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  • Dissimilar piping joint at high temperature, high pressure transient and under cyclic loading
  • Dissimilar piping joint at high temperature, high pressure transient and under cyclic loading
  • Dissimilar piping joint at high temperature, high pressure transient and under cyclic loading

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Experimental program
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Embodiment Construction

[0036] The problems of connecting stainless steel pipe sections and ferritic steel pipe sections in pipes preferably used in combined cycle power plants are:

[0037] Optimization of CTE (coefficient of thermal expansion) mismatch

[0038] · Achievement of operating pressure and temperature ratings

[0039] · Transient conditions with sharp ups and downs during device start-up

[0040] · Consideration of creep, fatigue and their interaction

[0041] ·Life and permissible cycle times

[0042] ·Lifetime free maintenance - not disturbed by the operating system

[0043] · No mixed welds on site

[0044] ·External force and moment

[0045] · Facilitate on-site replacement of existing layout

[0046] ·ASME and PED certified.

[0047] According to the invention, the dissimilar metal joining joint, which takes into account the different mechanical properties of the materials involved, is itself used to provide a critical material transition between joining surfaces with differe...

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Abstract

The invention discloses a dissimilar piping joint at high temperature, high pressure transient and under cyclic loading. According to the invention, the dissimilar piping joint arrangement (28) is described, comprising a first pipe section (30) and a second pipe section (31) and a dissimilar piping joint between the first pipe section and the second pipe section, the first and second consecutive pipe sections (30, 31) being made of first and second metallic materials (M5, M6) respectively with different material behavior and properties. An improved lifetime and extended applicability is achieved in that said dissimilar piping joint (28) is a coupling joint (F1, F2), said first pipe section (30) made of said first metallic material (M5) is provided at one end with a first coupling (F1) made of said first metallic material (M5), said second pipe section (31) made of said second metallic material (M6) is provided at one end with a second coupling (F2) made of said second metallic material (M6), and the first coupling (F1) and the second coupling (F2) are bolted together, whereby a first seal is established by direct metallic contact between the front faces of the first coupling (F1) and the second coupling (F2).

Description

technical field [0001] The present invention relates to the technology of pipes comprising sections of different materials. It relates to a dissimilar piping joint according to the preamble of claim 1 . Background technique [0002] The use of different metals / alloys which differ in their metallurgical properties and which in this context are referred to as "dissimilar metals" in the joint, which expose For high temperature, high pressure loads, high cycling, and high transients with external forces and moments. [0003] Existing codes and standards / literatures in the industry have less information on the properties and safety of such joints and are often unsafe. [0004] figure 1 A basic scheme of a combined cycle power plant (CCPP) 10 is shown. figure 1 The combined cycle power plant 10 includes a gas turbine 11 connected to a water / steam cycle 12 via a heat recovery steam generator (HRSG) 19 . [0005] The gas turbine 11 includes a compressor 14 which draws air throu...

Claims

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Application Information

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IPC IPC(8): F16L23/032F16L23/24F16L23/16F16L23/02
CPCF16L23/026F16L23/032F16L23/16F16L23/24Y02E20/16F16L25/00F02C6/18F02C7/14F05D2220/32F05D2220/72F16L23/20
Inventor G.施马尔斯鲍尔L.萨赫斯D.彭卡A.舒克拉E.普日拜尔
Owner GENERAL ELECTRIC TECH GMBH
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