ProAssure™ Wrap Extreme

This chapter details current industry codes for composite repair and case studies of both of the composite repair methods mentioned above through the use of two recently developed and field-tested repair systems, ProAssure Clamp and ProAssure Wrap Extreme. 

ProAssure Wrap Extreme was formerly marketed as PipeAssure . 

The qualification of ProAssure Wrap Extreme to ISO/TS 24817 has been witnessed and signed off by Det Norske Veritas (DNV). 

Two separate primers, one for use OOW and the other IW, have been developed for the ProAssure Wrap Extreme system. The OOW primer is recommended to be applied at a thickness of 1150 g/m, while the IW primer at an approximate thickness of 3600 g/m. The in-plane mechanical properties of ProAssure Wrap Extreme are summarized in Table 12.2. 

Two chemical types generally used for pipeline repair arc epoxy and polyurethane (PU) resins. PUs have the advantage of curing at ambient temperatures via water activation, but the downside is that they are also easily hydrolysed in water and they have relatively low Tg values. In contrast, epoxy resins are more moisture stable and can be formulated to provide high Tg and environmental stability using aromatic amino compounds (Klein, 1991 Varma and Gupta, 2000). However, most thermosetting systems can only be applied on dry surfaces and are adversely affected by surface moisture and contaminants. Hence, ProAssure Wrap Extreme is a modified proprietary formulation that enhances adhesion in water environments. 

Based on a 55 °C IW cure, it can be seen from Table 12.3 that the Tg of the composite is approximately 23 °C higher than that of the equivalent OOW cure case, hence meeting both wall thinning and through-wall defect requirements immediately upon curing. This shows that ProAssure Wrap Extreme has an added advantage when used IW. 

Table 12.2 In-plane mechanical properties of ProAssure Wrap Extreme at RT and 55 °C... 

N.B. Composite used is ProAssure Wrap Extreme, while substrate is an equivalent X65 caibon steel. The composite was co-cured onto the substrate by curing at 55 for 48 h. 

Figure 12.15 Repair installation at the splash zone of an offshore platform ex-factory rubbery-based coatings are prone to degradation over time in service and could be repaired with a system like ProAssure Wrap Extreme.

Figure 12.16 Subsea repairs, in this case to rectify a through-wall defect, could be carried out with a system like ProAssure Wrap Extreme.

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