The 3M Scotchkote PNC1011 is a technology breakthrough which comprises a one-part, heat curable thermosetting hybrid polypropylene-epoxy system that does not require additional adhesives because of its naturally strong bond with polypropylene and fusion-bonded epoxy (FBE). Scotchkote PNC1011’s unique interpenetrating network polymer creates synergies which result in a coating with a performance that exceeds that of both epoxy and polypropylene. Its highly reactive chemistry means it can be applied directly to an FBE coating even when it is fully cured.
3M Scotchkote PNC1011 has demonstrated better durability and adhesion than current three-layer systems, and is easier to apply. 3M Scotchkote PNC1011 is applied using an automatic applicator which ‘laminates’ the dual-layer film onto the field joint. The automatic application process means a more reliable and repeatable coating system, reducing operator variability and the potential for error which exists with other field joint coatings such as shrink sleeves.
The dual-layer film uses the residual heat from the pre-heat in the FBE application to bond to the FBE primer, eliminating the need for an adhesive. This results in a faster application process and removal of the potential for failure at the adhesive layer due to application conditions. Cycle times of
five to seven minutes are achievable.
As with all 3M Corrosion Protection products, Scotchkote PNC1011 was extensively evaluated and tested before being introduced to the market. 3M Scotchkote PNC1011 passed all of the tests outlined for Code 5C according to Clause 14 of the ISO 21809-3 standard. It also met the test requirements of the DIN 30678 and NFA 49-711 standards that are applicable to a polypropylene film. When applied correctly, 3M Scotchkote PNC1011 has a wide operating window, from 50–135degrees Celsius, due to special modifications of the polypropylene.
3M’s liquid coatings for onshore and offshore pipelines
3M’s industry experience and innovative technologies underlies a complete line of high performance coatings for onshore and offshore pipelines – including liquid epoxies such as 3M Scotchkote Liquid Epoxy 323i, and polyurethanes such as 3M Scotchkote Urethane Coating 352.
3M Scotchkote Liquid Epoxy 323i is a two-part liquid epoxy coating which can be used as a patch material, field joint coating, or as a standalone internal or external pipeline coating for corrosion protection. Scotchkote323i demonstrates excellent adhesion and abrasion resistance and can be applied at coating thicknesses up to 1,000microns in a single application. It is also 100 per cent solids, which means very low volatile organic emissions emissions making it suitable for application in confined spaces such as on the pipelaying barges.
Recent project experience has demonstrated that 3M Scotchkote 323i can be applied at 75 degrees Celsius and then force cured to reduce cycle times while improving application efficiencies. This mitigates the risk of the pipe approaching the glass transition temperature of the parent FBE coating and reduces the risk of the FBE coating blistering during application.
A key advantage of Scotchkote 323i for offshore pipelines is its ease of application with the 3M Scotchkote Spray System HSS-450. The HSS-450 system utilises a dual-cartridge setup along with unique application equipment designed specifically to spray apply Scotchkote 323i. This system enables efficient and productive application, removes the requirement for manual mixing, limits pot life issues and results in less waste, making it well suited to offshore application conditions.
3M recently partnered with Offshore Joint Services and McDermott Australia Pty for the ExxonMobil Kipper Tuna Turrum Project off the eastern Victoria coast. The Kipper Gas Pipeline comprised an FBE and concrete weight coating, with 3M Scotchkote 323i applied to the field joints to provide superior corrosion protection.
3M and Scotchkote are trademarks of 3M Company.
