Product category:
Plant Design and Construction
News Release from: Arc Energy Resources | Subject: Weld overlay cladding
Edited by the Processingtalk Editorial
Team on 16 August 2004
Cladding protects tube sheets for
methanol plant
Specialised weld overlay cladding by Arc Energy Resources was specified by Wellman Graham to provide corrosion protection on heat exchanger tube sheets destined for a new methanol plant in Trinidad
Specialised weld overlay cladding from Arc Energy Resources has been specified by Wellman Graham to provide corrosion protection on heat exchanger tube sheets destined for a new methanol plant in Trinidad Wellman Graham, a manufacturer of process equipment including vacuum systems, condensers, heat exchangers, pressure vessels and distillation columns, uses Arc Energy's weld overlay cladding services for a range of applications in petrochemical plants, oil refineries and power stations
This article was originally published on Processingtalk on 22 Jan 2007 at 8.00am (UK)
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The base material for the five tube sheets on this most recent contract was carbon steel, which Arc Energy overlaid with a coating of stainless steel to provide corrosion protection from hydrocarbons and other aggressive streams.
After considering the size of the components - all around 2m in diameter - and the urgent delivery schedule, Arc Energy decided to use the high speed submerged arc process to deposit the coating material.
This is one of a number of processes that enable the company to accommodate the cladding of large components such as these, and bores as small as 50mm.
Explaining the advantages of using weld overlay cladding for the contract, Arc Energy's sales manager Allan Brown says that, apart from the obvious cost savings achieved by producing the tube sheets in conventional carbon steel and cladding only the areas subjected to corrosion, there is also a significant time saving due to material availability.
"In cases such as this, where delivery is paramount, lead times are often more important than the cost itself," he says: "and there would almost certainly be a very long lead time if customers were sourcing large forgings of this type in solid corrosion resistant alloys".
Commenting for Wellman Graham, sales and engineering technical director George Bowes says time was a major constraint on this particular contract, but Arc Energy responded to the challenge with a quality job that was delivered on time.
He adds that the order for the heat exchangers was placed by the London office of MAN Ltd, part of a German engineering group.
The metallurgy was specified by the project engineers, Davy Process Technology, and converted into a detailed specification by Wellman Graham.
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