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

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
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$20.00
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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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Picture for The Sensitisation Behaviour of Alloy UNS N08825 After Heat Treatment as Used in Clad Materials
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The Sensitisation Behaviour of Alloy UNS N08825 After Heat Treatment as Used in Clad Materials

Product Number: 51317--9459-SG
ISBN: 9459 2017 CP
Author: Helena Alves
Publication Date: 2017
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The aim of this paper is to present recent standard test corrosion data obtained in laboratory for alloy UNS N08825 after post weld heat treatment in comparison with as delivered (soft annealed) material.