Jet flame and hydrocarbon flame resistant medium voltage cable for offshore oil platform and its manufacturing method

Abstract

The invention relates to a medium-voltage cable resistant to jet flame and hydrocarbon flame for offshore oil platforms and a manufacturing method thereof. The outer periphery of a stranded tinned annealed copper conductor is wrapped with a semiconductive shielding layer from the inside to the outside by means of three-layer co-extrusion. , insulating layer and semi-conducting insulating shielding layer, after braiding a tinned copper wire shielding layer on the outer periphery of the semi-conducting insulating shielding layer, a shielded wire core is formed, and a plurality of shielded wire cores are twisted with each other to form a cable core, and the outer circumference of the cable core is extruded. The inner silicone oil layer, the inner lining layer is extruded on the outer periphery of the inner silicone oil layer, the refractory wrapping tape is wrapped around the outer periphery of the inner lining layer, the armoring layer is wrapped around the outer periphery of the refractory wrapping tape, and the outer periphery of the armoring layer is extruded. For the outer silicone oil layer, a jet flame and hydrocarbon flame resistant inner sheath is extruded on the outer periphery of the outer silicone oil layer, and a mud-resistant cross-linked polyolefin outer sheath is extruded on the outer periphery of the jet flame and hydrocarbon flame resistant inner sheath. The cable adopts double-layer composite sheath, which can withstand high temperature flame of 1300℃ for 120 minutes under rated voltage without ground fault or short circuit.

Description

technical field [0001] The invention relates to a cable for offshore oil platforms, in particular to a medium-voltage cable resistant to jet flame and hydrocarbon flame for offshore oil platforms, and also to a medium-voltage cable resistant to jet flame and hydrocarbon flame for offshore oil platforms The manufacturing method of the invention belongs to the technical field of special cables for offshore oil platforms. Background technique [0002] Oil and gas engineering equipment is very vulnerable to fire damage. When a fire occurs, the high temperature caused by the combustion of oil and gas can easily cause equipment failure and cause great harm to the safety of the entire platform and personnel. Therefore, oil and gas engineering equipment needs to pay special attention to fire prevention. Its fire protection is divided into 3 categories, namely anti-fiber flame, anti-hydrocarbon flame and anti-jet flame. At present, the supporting cables of oil and gas engineering eq...

AI Technical Summary

Problems solved by technology

In traditional oil and gas engineering equipment, when the cables need to be resistant to jet flames and hydrocarbon flames, fiber flame-resistant cables will be used as a substitute. However, due to the fire-resistant temperature rating of fiber flame-resistant cables, the highest IEC60331 standard is 830 ° C, and the BS6387 standard is 950. ℃, which are far lower than the temperature level of 1100 ℃ of hydrocarbon flame and 1300 ℃ of jet flame, there are great safety hazards in jet flame and hydrocarbon flame fire

[0003] The Chinese invention patent with the publication number CN 103594177B discloses a hydrocarbon aging-resistant instrument cable for petrochemical equipment; the Chinese invention patent with the publication number CN 103578641B discloses a hydrocarbon aging-resistant power cable for petrochemical equipment. However, none of them are resistant to hydrocarbon flames and jet flames.

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