A monolithic isolation joint mainly consists of a metal body, an insulating bushing, a seal, and a connecting flange. Its core function is to block current conduction through an insulating layer while ensuring the sealing integrity of the pipeline or cable system.
Monolithic isolation joint product structure and working principle:
A monolithic isolation joint consists of the following parts: upper and lower tubes, sleeve, insulating component, sealing component, and insulating coating. The insulating component and sealing component are sandwiched between the mating ends of the upper and lower tubes, forming a double-sealed structure with insulating properties. The sleeve is either beveled or directly welded to the upper conduit, firmly sealing the insulating component and the upper and lower tubes inside, forming a "sealed container." This ensures both good insulation performance and significantly improves the pressure-bearing capacity of the insulation structure.
Technical Specification
This standard applies to the following working conditions:
Electrochemical corrosion protection engineering for buried or above-ground oil and gas steel pipelines;
Nominal diameter ≤ 600mm and design pressure ≤ 16MPa;
Nominal diameter ≤ 1400mm and design pressure ≤ 12MPa;
Applicable temperature range: -45℃ to 100℃
Product testing standards require passing:
18MPa withstand voltage test
540-ton equivalent bending moment load test
40-cycle fatigue test
Electrical insulation performance ≥150MΩ
Breakdown voltage ≥3kV
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