Hot risers | project study
Ceramic-filled epoxy coating protects hot risers in China
Chinese petrochemicals company CNOOC selected a fast curing ceramic-filled epoxy-based coating from Germany’s Ceramic-Poly- mer to internally coat six 60m-long six-inch riser pipes to transport hot crude oil and oil water mixtures at temperatures of 80˚C for a new oil platform project in the Weizhou 12-1 oil field in the Beibu Gulf in the South China Sea last year.
“CNOOC was searching for a chemical and temperature resistant coating material that could be used easily and had fast curing times,” says Ceramic-Polymer Sales Manager Woldemar Haak. “Our product Proguard CN 200 was the optimum solution. Besides the required physical properties, the coating material cures very fast - in common conditions it is fully cured after 48 hours.” Proguard CN200 is a
two-part novolac-based epoxy containing micro and nano- scale ceramic particulates that is claimed to provide high
CNOOC selected Ceramic- Polymer’s Proguard
CN200 to internally coat six 60m hot crude risers
levels of chemical, abrasion and corrosion resistance. The coating is commonly used for protection of storage tanks for hydrocarbon products, but has also been used in a number of pipeline protection projects, according to the company. The CNOOC riser pipes
were constructed by CNOOC Zhanjiang Detect Engineering and the internal coating applied by Guangdon Wwin Petrochemical, which distrib- utes Ceramic-Polymer products in China. The process
comprised grit blasting the internal surfaces of the pipes to a standard SSPC-SP10 finish using a custom blasting tool prior to the application of two 500 micron thick layers of the Proguard CN200 coating with an application interval of 24h. Haak says application was simplified by the low viscosity of the CN200 coating system, which meant the coating resin components required no pre-heating, and the ability to reach a full cure of the each layer within 24h, meaning the full coating thickness could be achieved within 48h. “Full properties - resistance to chemicals, temperature, abrasion - are reached after seven days curing,” he says. The cured coating was
Detailed view of the coated riser showing the cured Proguard CN200 internal finish
www.pipeline-coating.com
inspected for pinholes, blisters and cracks after application using a 3KV electronic spark holiday tester and no defects were detected over the full 180m of coated pipe. Measure-
ments also showed the minimum coating requirement of 1,000 microns was achieved. CNOOC tested the coating on six riser pipes prior to going ahead with this project and was “absolutely satisfied” with the performance, according to Ceramic-Polymer, which is owned by AW Chesterton. Haak says the company provided coating selection sup- port to its Chinese customer, while the application itself was run according to Guangzhou Wwin’s inspection plan. “Wwin is very experienced in applying our coatings,” Haak says. Haak says Guagzhou Wwin
has completed a number of external riser pipe coating projects using another of the company’s coatings – Ceram- ic-Polymer SF/LF. This is a solvent-free product designed for airless spray application of- fering high adhesion and abrasion resistance. ❙
www.ceramic-polymer.de
September 2015 | PIPELINE COATING 23
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