Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants: Part 4—Weld Repair for Specific Materials - Stainless Steel, Clad Steel and Dissimilar Joints

2011 ◽  
Author(s):  
Tsukasa Okazaki ◽  
Rinzo Kayano ◽  
Takahisa Hoshika ◽  
Shinta Niimoto
Keyword(s):  
Stainless Steel ◽  
Chemical Plants ◽  
Safe Operation ◽  
Weld Repair ◽  
Dissimilar Joints ◽  
Weld Overlay ◽  
Repair Welding ◽  
Engineering Society ◽  
Clad Steel

It has been recognized that repair welding plays an important role in the long term, safe operation of pressure equipment. In 2009, the Japan Welding Engineering Society (JWES) published guidelines for repair welding of pressure equipment to meet the great need for the safe operation and proper maintenance of aging plants. This paper describes Part 4 of the guideline, which covers repair welding of stainless steel, clad steel, weld overlay and dissimilar joints.

Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants: Part 2—Repair Welding Method

2011 ◽  
Author(s):  
Keisuke Shiga ◽  
Yukio Hirai ◽  
Ogayu Yasushi
Keyword(s):  
Chemical Plant ◽  
Chemical Plants ◽  
Safe Operation ◽  
Research Committee ◽  
Repair Welding ◽  
Welding Method ◽  
Engineering Society

It has been recognized that repair welding plays an important role of in the long term, safe operation of pressure equipment. In 2009, the Japan Welding Engineering Society (JWES) published guidelines for repair welding of pressure equipment, to meet the great need for the safe operation and proper maintenance of aging plants. This paper gives brief descriptions of three types of repair welding method, “Flaw excavation and repair welding”, “Butt-welded insert plates”, and “External fillet welded patches”, which welding methods are based on Chemical Plant Welding Research Committee of JWES.

Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants: Part 6—Material Degradation and Repair Welding

2011 ◽  
Author(s):  
Tomoaki Kiso ◽  
Rinzo Kayano ◽  
Eiki Nagashima ◽  
Yasuhiro Hara
Keyword(s):  
Chemical Plants ◽  
Material Degradation ◽  
Safe Operation ◽  
Damage Mechanisms ◽  
Repair Welding ◽  
Engineering Society ◽  
Key Points ◽  
Damaged Materials

It has been recognized that repair welding plays an important role in the long term, safe operation of pressure equipment. In 2009, the Japan Welding Engineering Society (JWES) published guidelines for repair welding of pressure equipment, to meet the great need for the safe operation and proper maintenance of aging plants. This paper addresses the key points of repair welding for damaged materials, based on JWES’s guidelines. The various factors to be considered before implementing repair welding and typical methods of repair welding for the major damage mechanisms are summarized.

Guidelines for Repair Welding of Pressure Equipment in Refinery and Chemical Plants: Part 3—Repair Welding for Specific Materials - Carbon Steel, High Tensile Steel and Cr-Mo Steel

2011 ◽  
Author(s):  
Rinzo Kayano ◽  
Masamitsu Abe ◽  
Yukio Hirai
Keyword(s):  
Carbon Steel ◽  
Pressure Vessels ◽  
Chemical Plants ◽  
Safe Operation ◽  
Gas Industry ◽  
Repair Welding ◽  
Weld Residual Stress ◽  
Natural Gas Industry ◽  
And Storage

It has been recognized that repair welding plays an important role in the long term, safe operation of pressure equipment. In 2009, The Japan Welding Society (JWES) published guidelines for repair welding of pressure equipment [1], to meet the great need for the safe operation and proper maintenance of aging plants. Pressure equipments made from carbon steel, high tensile steel and Cr-Mo steels are utilized for high pressure services. The subject equipments are pressure vessels, heat exchangers, piping, and storage tanks for petroleum, petrochemical and liquefied natural gas industry. This paper summarizes category and property of these steels and repair welding method including special attention. Especially, weld cold cracking for these steels could be prevented by controlling the repair welding and post-weld heat treatment process to reduce the hydrogen content, hardness and weld residual stress.

Guideline for Repair Welding of Pressure Equipment in Refineries and Chemical Plants: Part 5—Repair Welding for Specific Materials - Heat Resistance Alloy and Non-Ferrous Metals

2011 ◽  
Author(s):  
Hirohisa Watanabe ◽  
Keisuke Shiga ◽  
Atsushi Ohno
Keyword(s):  
Heat Resistance ◽  
Chemical Plants ◽  
Repair Welding ◽  
Engineering Society ◽  
Ferrous Metals ◽  
Resistance Alloy ◽  
Nickel Copper ◽  
Key Points ◽  
Non Ferrous Metals

It has been recognized that repair welding takes an important role in the long term, safe operation of pressure equipment. Responding to the needs in petroleum and chemical industries, the Japan Welding Engineering Society (JWES) published Guideline for repair welding of pressure equipment at 2009. This paper describes the key points of repair welding for heat resistance alloy and non-ferrous metals such as Nickel, Copper, Titanium and their alloys, based on JWES’s guidelines. Before implementing repair welding, it is important to understand the features of damaged materials, because these materials have been used at severe environment in plants.

Assessment of Weld Overlay Defects in a Hydrocracking Unit Reactor

2013 ◽  
Author(s):  
Mohammed S. Robai ◽  
Jarallah A. Al-Sudairy ◽  
Abdullah M. Al-Harbi ◽  
Joy Joseph
Keyword(s):  
Stainless Steel ◽  
Performance Management ◽  
Base Material ◽  
Material Degradation ◽  
Safe Operation ◽  
Weld Overlay ◽  
Temperature And Pressure ◽  
Operational Excellence ◽  
Very High

Asset Performance Management is a key element of operational excellence. It refers to the management systems, strategies and activities aimed at maintaining the integrity of plant assets for their desired life. The safe operation of the assets is to be ensured at any cost. The objective of this paper is to offer one of the most critical assets in a refinery, namely the Hydrocracking Unit (HCU) reactor, as a case study addressing assessment of defects found in the weld overlay. The reactor was built in 1978 according to ASME Sec. VIII Div. 2 and has been in operation since then. The reactor is constructed of Chromium-Molybdenum (Cr-Mo) base material (SA 336 F21) with thickness of 266 mm and corrosion resistant stainless steel (TP-347 with thickness of 3.2 mm) weld overlay. The very high operating temperature and pressure of the reactor in hydrogen rich hydrocarbon service and the resulting thermal stress and material degradation caused disbonding and cracks in the stainless steel weld overlay. This paper will address the approach that was used to alleviate such type of defects. Also, various considerations that go into the assessment are discussed and recommendations are suggested.

Weld Repair for Pressure Vessels Made From Cr-Mo Steels

2010 ◽  
Author(s):  
Rinzo Kayano ◽  
Eiichi Yamamoto ◽  
Takayasu Tahara
Keyword(s):  
Temper Embrittlement ◽  
Welding Process ◽  
Pressure Vessels ◽  
Research Committee ◽  
Weld Repair ◽  
Repair Welding ◽  
Term Operation ◽  
Repair Procedure ◽  
Past Experiences

Pressure vessels made from Cr-Mo steels are utilized for high temperature and high pressure services including hot hydrogen services. After long term operation, there are several past experiences of damages and/or degradation of materials such as temper embrittlement, creep embrittlement, hydrogen attack and hydrogen embrittlement. This paper summarizes typical damages/degradation and examples of weld repairs including special attention to development of weld repair procedure. The subject equipments are heavy wall petroleum pressure vessels made from Cr-Mo steel with austenitic stainless steel overlay cladding. Cracking could be prevented by controlling the repair welding process to reduce the hydrogen content at the interface. After repair welding, adequate post weld heat treatment (PWHT) has to be executed. Recently, repair welding has become an important aspect as part of post construction codes for pressure equipment to keep safe and long term continuous operation of the process plants because many of the plants have been operated for more than thirty years in Japan. Responding to the needs of petroleum and chemical industries, The Chemical Plant Welding Research Committee (CPWRC) of The Japan Welding Engineering Society (JWES) established the Pressure Equipment Repair Welding Subcommittee (PERW S/C) [1]. The S/C has developed optimum repair welding methods and procedures in the guideline on November 2009, with reference to the above investigation results. This paper also introduces the repair welding guideline for the pressure vessels made from Cr-Mo steels.

Precipitation behavior of stainless steel weld overlay cladding exposed to a long-term thermal aging

2018 ◽  
Vol 137 ◽  
pp. 77-83 ◽  
Author(s):  
Xinyuan Cao ◽  
Ping Zhu ◽  
Wei Wang ◽  
Tingguang Liu ◽  
Yonghao Lu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Thermal Aging ◽  
Steel Weld ◽  
Precipitation Behavior ◽  
Weld Overlay ◽  
Stainless Steel Weld

Guidelines for Repair Welding of Pressure Equipment in Refineries and Chemical Plants: Part 1—General

2011 ◽  
Author(s):  
Eiichi Yamamoto ◽  
Takayasu Tahara ◽  
Yukinobu Matsushita ◽  
Fumiyoshi Minami
Keyword(s):  
Pressure Vessels ◽  
Chemical Plants ◽  
Process Industries ◽  
Repair Welding ◽  
Engineering Society ◽  
Typical Material

Responding to the needs in petroleum and chemical industries, the Japan Welding Engineering Society (JWES) has been worked to establish a repair welding guideline on pressure equipment in refineries, petrochemical and other process industries. As accomplishments, JWES published Guideline for Repair Welding on Pressure Equipment in 2009. The paper describes Part 1 of the guideline which covers typical material degradations of the pressure vessels, equipment diagnosis and role of repair welding and standard repair welding procedures.

G-30 FILLER METAL

Alloy Digest ◽  
1993 ◽  
Vol 42 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Filler Metal ◽  
Weld Repair ◽  
Weld Overlay ◽  
High Chromium ◽  
Cast Products

Abstract Hastelloy Alloy G-30 filler metal is used as matching composition filler metal for fabrication of Hastelloy G-30 wrought and cast products and as filler metal for fabrication of G/G-3 alloy wrought products. It is also used for weld repair of high chromium castings and for weld overlay cladding. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-432. Producer or source: Haynes International Inc.

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