FIRE RESISTANT CABLE ASSEMBLY, POWER AND CONTROL FOR EXPLOSIVE ATMOSPHERES on floating drilling units and fixed offshore platforms

摘要

The invention relates to fire-resistant cable assembly, control and power for hazardous areas on offshore drilling units and fixed offshore platforms. core twisted cable of insulated stranded copper conductive wires. Cores single or pre-twisted in a group of several insulated conductors. Insulation of conductors formed combination, of at least two layers. First layer flame-retardant operate in one of two ways: a winding helically overlapping at least one slyudinitovoy tape is a layered composite of mica paper with a silica content (36,8-45,1)% by weight aluminum oxide (10 , 8-17,7)% by weight, the electrical insulation of the quartz glass fabric impregnated and bonded together organosilicon binder or extruded keramiziruyuscheysya of insulating silicone rubber. The second layer in order to achieve the required electrical parameters is made extruded PVC, or rubber adhesive or cross-linked polyethylene. Proposed shielded construction with screens through the veins, in groups of core. Cables have filler and moisture proof envelope, executed PVC or rubber is not self-supporting combustion. For fire safety requirements proposed design with the execution of a special PVC compound with reduced dymogazovydeleniem and oxygen index of not less than 30 and a halogen-free polymer composition with an oxygen index of not less than 35 developed armored cable design with armor of round galvanized steel or stainless steel, or phosphor bronze wires and a moisture hose of various polymer materials which are not self-supporting combustion. The use of fire-resistant cables, installation, control and power for hazardous areas in the systems of power supply and automation on floating drilling rigs and fixed offshore platforms will ensure trouble-free operation of the equipment operation control systems and actuators in an emergency, including in case of fire.