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News

Heerema Hartlepool benefits from new ESAB sub-arc wire and flux

ESAB Group : 04 July, 2003  (Company News)
At its two offshore yards in Hartlepool, Heerema Hartlepool Limited produce large, complex structures for the oil and gas industry including offshore modules and jackets, HHL are able to offer under cover facilities suitable for construction projects up to 12,000 tonnes.
Building such large structures means that savings in consumables and productivity can make a huge difference to overall project costs. HHL, keen to keep abreast of the latest technology has switched from using solid wire with agglomerated flux to ESAB OK Tubrod 15.24S fluxed cored wire and OK 10.47 fused flux for 90% of its submerged arc welding.

Many advantages have been gained by utilising the new consumables. Due to the deposition rate of a cored wire, welding times can be reduced by between 20 to 25%, compared to conventional solid wires of the same diameter.

The ESAB OK 10.47 fused flux, unlike other fused fluxes, is fully basic as opposed to acidic. This gives increased mechanical properties with higher strength and toughness essential for offshore structures, whilst providing ease of handling associated with a fused flux. Further advantages are gained by the flux being less hydroscopic than agglomerated and as such, has a greater resistance to absorption of moisture from the atmosphere simplifying quality control on the shop floor and making it possible to recycle the flux almost indefinitely. This leads to a reduction in flux consumption and further reduced costs.

A further benefit is the 'self releasing' ability of the slag. Agglomerated fluxes, traditionally used for offshore construction, have poor slag release properties, especially in joints with narrow prep angles. The self release characteristics give a reduction in joint completion time, and help to create a better working environment as air chisels and needle guns are no longer required for interpass cleaning.

HHL first used this product on the Phillips Jade project, and are currently using it on a project recently awarded by Noble Drilling Ltd for the fabrication of the drilling modules for the BP Clair field.
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