Control cables, installation and power FOR EXPLOSIVE ATMOSPHERES on floating drilling units and fixed offshore platforms

摘要

The invention relates to the control cables, power and mounting for hazardous areas on offshore drilling units and fixed offshore platforms. the cable core is composed of stranded copper or tinned copper conductive wires isolated EPR or silicone rubber, or groups of several twisted insulated conductors. By including more than one core or groups are twisted together with a twist povivnoy filling voids in the core polymer filler formed on the basis of polyvinylchloride plastic. Superimposed over the core common screen or as a braid of copper or tinned copper wires, or a combination of successive layers of the tape and a metal-braid of copper or tinned copper wires. In this case, the braid density is selected such that its mass is not less than 90 weight% copper tubing with the same internal diameter and thickness equal to the diameter of the wire braid. Above the common screen superimposed WATERPROOF sheath neftemaslobenzostoykih resistant to sea water and sea mist polyvinylchloride plastic, rubber or polychloroprene, or chlorosulphonated polyethylene. A design in which one or more insulated conductors or groups of superimposed individual or, respectively, group screens that match the structure with the common screen and sheath PVC or ethylene propylene or silicone, or polychloroprene rubbers, and chlorosulphonated polyethylene imposed pressure . The thicknesses of the membranes and the belt insulation shield over the individual or group of screens are selected on condition that they withstand voltage test of not less than 500 V AC at 50 Hz, applied between any individual or group screens between any individual or group and common screen, between the common screen water. Also proposed the construction of armored cables and to meet the increased requirements of fire safety. Design proposed in this utility model, ensure the fulfillment of the requirements for cables specified in the Rules of classification, construction and equipment of mobile offshore drilling units and fixed offshore platforms.