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Technical Briefs

Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants

[+] Author and Article Information
Eiichi Yamamoto

Eishintechno,
Fujisawa, Japan
e-mail: ei.yama@jcom.home.ne.jp

Keisuke Shiga

Shinko Plantech Co, Ltd.,
Yokohama, Japan
e-mail: shigake@s-plantech.co.jp

Rinzo Kayano

The Japan Steel Works, Ltd.,
Muroran, Japan
e-mail: rinzo_kayano@jsw.co.jp

Tsukasa Okazaki

Taseto Co., Ltd.,
Fujisawa, Japan
e-mail: okazaki.tsukasa@taseto.com

Hirohisa Watanabe

Kobe Steel, Ltd.,
Fujisawa, Japan
e-mail: watanabe.hirohisa@kobelco.com

Tomoaki Kiso

JGC Corporation,
Yokohama, Japan
e-mail: kiso.tomoaki@jgc.co.jp

Takayasu Tahara

Petroleum Association of Japan,
Tokyo, Japan
e-mail: t.tahara@sekiren.gr.jp

Fumiyoshi Minami

Osaka University,
Osaka, Japan
e-mail: minami@mapse.eng.osaka-u.a.c.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 26, 2012; final manuscript received February 4, 2013; published online May 21, 2013. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 135(3), 034501 (May 21, 2013) (12 pages) Paper No: PVT-12-1087; doi: 10.1115/1.4023729 History: Received June 26, 2012; Revised February 04, 2013

This paper outlines the technical logic/steps that have been documented in JWES-CP-0902, “Guidelines for Repair Welding on Pressure Equipment”(hereinafter the Guidelines). The paper covers the work flow logic that can be followed by maintenance personnel as they address making a repair welding in pressure vessels/piping made of both ferrous and nonferrous materials after flaw detection during inspection during refinery operation. Material degradation factors that are considered include: strength loss, ductility loss, temper embrittlement, σ embrittlement, corrosion metal loss, stress corrosion cracking, fatigue, and creep.

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References

Figures

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Fig. 1

Repair welding guidelines and supporting system

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Fig. 2

Standard work flow of repair welding

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Fig. 3

Selection of repair welding methods

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Fig. 4

Extent of flaw removal external fillet weld patches

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Fig. 5

Welding sequence for insert plates [11]

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Fig. 6

External fillet welded patch method

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Fig. 7

Required size and thickness of patch plate and fillet welds

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Fig. 8

Local PWHT after repair welding at the bottom of gasket groove in manhole flange

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Fig. 9

Microstructure of weld metal and its property estimated from the Schaefller's diagram with chemical composition

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Fig. 10

Effect of P and S on hot cracking susceptibility of austenitic stainless steel [12]

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Fig. 11

Weld heat affected zone cracking in welded joint of radiant tube

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Fig. 12

Effect of solution heat treatment on elongation of material

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