| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.11 ( March 1985 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Embossed Plastic and Concrete Coated Pipe for Offshore Pipelines Shojiro Minamiya, Masakuni Shibagaki, Kazuyoshi Kuwata, Teruhisa Usui, Yuji Ikeda, Shigeyuki Oba |
|
Synopsis : The strong demand for corrosion resistant offshore steel pipelines in recent years has led to the making of pipes coated with polyethylene or epoxy resin. Furthermore, for minimizing buoyancy of the pipes during the laying work and for protecting them on the sea bottom, concrete-coated pipes have begun to be used. Recently, the authors have successfully developed a new product whose concrete coating is fast bonded to the polyethylene coating for a remarkable increase of the adhesive strength of concrete. This new coated steel pipe is embossed with a rugged pattern on the outer surface of the polyethylene coating to achieve a perfect bond between polyethylene and concrete so as to prevent peeling-off of concrete and damages of pipe during pipe laying and to improve pipe protection on the sea bottom. Embossing the outer surface of polyethylene coating has achieved, at the concrete coating interface, an adhesive strength of more than 12kgf/cm2 which is about 30 times that for the non-embossed pipe. Chita Works made the first shipment of the new products to a major oil company in February 1983. |
| TextiPDF: 8p./408kbj |