Resin chosen for subsea application
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Scott Bader Company product story
Edited by the Engineeringtalk editorial team
May 30, 2008
The covers are designed to provide impact protection to pipeline connection points from surface dropped objects such as drillpipes.
Sorkomp of Norway has specified Scott Bader's gelcoats and the Crystic 703PA polyester resin for the production of GRP subsea structures.
Over 80 large covers for the protection of undersea oil and gas pipeline equipment have been recently manufactured, with a total GRP gross weight of 430 tonnes.
The majority of the products have been supplied to Acergy Norway for the Tyrihans project.
The covers are designed to provide impact protection to pipeline connection points from surface dropped objects such as drillpipes.
Pipeline expansion zones, usually an area of Z-shaped pipework, are similarly protected, with the covers also providing overall protection to seabed installations against commercial trawling operations.
The GRP covers manufactured using the Scott Bader products are typically 24mm thick, sufficient to withstand a dropped-object impact force of 50kN.
Areas of thicker laminate (up to 80mm) are also incorporated as lifting points for the heavier structures (maximum 30 tonnes).
GRP is the material of choice for these protective covers as it requires no anodic corrosion protection and its installation weight is only a third taht of a comparable steel structure, while still providing high impact strength.
The Scott Bader Crystic 703PA is a pre-accelerated, DCPD polyester resin with low viscosity and controlled exotherm characteristics.
The material is approved by Lloyds Register of Shipping for marine applications and is suitable for vacuum injection and other similar production techniques, particularly with large structures.
It is also compatible with most reinforcements and provides excellent mechanical properties and impact resistance.
On completion of the vacuum injection production process, the undersea mouldings are subject to an outer surface yellow gelcoat finish which ensures maximum visibility for seabed conditions.
A final top gelcoat finish is also then applied.
Both these products are also manufactured by Scott Bader, the coloured gelcoat being the Crystic 0209 SMK, which is isophtalic with low styrene content and good self levelling properties.
The final brushed topcoat is the Crystic X 103 KH, which is a pre-accelerated orthophtalic gelcoat with a tack-free surface.
Both these products are thixotropic polyester gelcoats, designed for rapid curing and suitable for the production of high-quality mouldings.
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