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51316-7174-Utilizing Nickel Alloy metal coating as an alternative to PWHT

Picture for Utilizing Nickel Alloy metal coating as an alternative to PWHT
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Metal or thermal spraying is a technology which protects and extends the life of a variety of equipment in hostile environments. This paper presents an experience in utilizing Thermal Spray Coating Technology on top of weld build-up of CS Pressure Vessel eroded shell.

Product Number: 51316-7174-SG
ISBN: 7174 2016 CP
Author: Abdullah Al-Ali
Publication Date: 2016
Industry: Coatings and Linings
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$20.00

Metal or thermal spraying is a technology which protects and greatly extends the life of a wide variety of equipment in the most hostile environments. Thermal spray coating for corrosion resistance typically includes Ni-based alloys such as Alloy C-276. Thermal spraying involves the projection of small molten particles onto a prepared surface where they adhere and form a continuous coating. Thermal Spray Coating has been introduced in the oil and gas industry recently as a repair technology for in-service pressure vessels it has been successfully applied by several Oil and Gas companies. The technology has a relatively high capital cost but is cost effective when other traditional technologies fail and when comparing lifetime costs. For example in an in-service amine stripper PWHT following weld repair may not be viable as PWHT will affect vessel stability and impact also the T&I schedule.This paper presents an experience in utilizing Thermal Spray Coating Technology on top of weld build-up of CS Pressure Vessel eroded shell. The vessel is under lethal service and had severe erosion on some of its internal surface of the shell. According to ASME PCC-2 (Repair of Pressure Equipment and Piping) Article 2.11 PWHT is required after retention of nominal wall thickness through weld build-up. However heat treatment of this vessel was infeasible due to stability analysis results that show instability of the column during heat treatment. Moreover laying down the column to perform PWHT is highly costly and would significantly impact shutdown schedule of the unit.

Keywords:  downloadable, Thermal spray coating, amine service, weld build-up, heat treatment, SCC

Metal or thermal spraying is a technology which protects and greatly extends the life of a wide variety of equipment in the most hostile environments. Thermal spray coating for corrosion resistance typically includes Ni-based alloys such as Alloy C-276. Thermal spraying involves the projection of small molten particles onto a prepared surface where they adhere and form a continuous coating. Thermal Spray Coating has been introduced in the oil and gas industry recently as a repair technology for in-service pressure vessels it has been successfully applied by several Oil and Gas companies. The technology has a relatively high capital cost but is cost effective when other traditional technologies fail and when comparing lifetime costs. For example in an in-service amine stripper PWHT following weld repair may not be viable as PWHT will affect vessel stability and impact also the T&I schedule.This paper presents an experience in utilizing Thermal Spray Coating Technology on top of weld build-up of CS Pressure Vessel eroded shell. The vessel is under lethal service and had severe erosion on some of its internal surface of the shell. According to ASME PCC-2 (Repair of Pressure Equipment and Piping) Article 2.11 PWHT is required after retention of nominal wall thickness through weld build-up. However heat treatment of this vessel was infeasible due to stability analysis results that show instability of the column during heat treatment. Moreover laying down the column to perform PWHT is highly costly and would significantly impact shutdown schedule of the unit.

Keywords:  downloadable, Thermal spray coating, amine service, weld build-up, heat treatment, SCC

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51316-7152-Self-healing protection of pipeline corrosion by epoxy coating with preloaded inhibitors

Product Number: 51316-7152-SG
ISBN: 7152 2016 CP
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ISBN: 6970 2016 CP
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