Shenyang Wensheng Insulating Joint: A Core Component Easily Neglected in Pipeline Engineering

Professionals engaged in oil, gas, chemical and municipal pipeline industries know clearly that the main causes of rapid wear and potential safety hazards in pipeline projects are neither excessive pipeline pressure nor medium erosion, but invisible electrochemical corrosion.

After three to five years of operation, station facilities and long-distance pipelines frequently suffer from cylinder rust of pig launcher and receiver, corrosion at joints of quick-opening Closures, electric leakage at pipeline connections and abnormal fluctuation of cathodic protection parameters.

Root cause investigation shows that inadequate insulation isolation between pipelines and equipment leads to continuous erosion of metal base materials by stray current, which gradually damages pipeline components.

We here by introduce a practical, reliable and highly applicable fitting—the integrated Insulating Joint manufactured by Shenyang Wensheng Instrument & Equipment Co., Ltd. All technical parameters and applicable working conditions are formulated in strict accordance with actual factory production standards.

1. Basic Product Parameters

The company mainly promotes the QDQ-JD series welded integrated insulating joint. Products are manufactured complying with domestic standards for pressure vessels and long-distance pipelines. The enterprise is equipped with professional testing facilities. Each finished product passes a hydraulic pressure test, an air tightness test and an insulation voltage withstand test. Unqualified products are forbidden to be delivered.

· Diameter range: DN15-DN1200. Standard specifications are in stock for prompt delivery; extra-large and special sizes can be customized.

· Pressure rating: PN1.0 MPa-PN35 MPa, suitable for civil low-pressure pipelines and industrial high-pressure pipelines, meeting the pressure demands of most projects.

· Main materials:

· SA516GR.60/70N: special pressure vessel steel plate with high yield strength and good toughness, suitable for medium and high pressure conditions.

· API 5L X 52/60/65/70: excellent comprehensive mechanical properties, balanced weldability and corrosion resistance, adaptable to most oil, gas and chemical media.

· SA333GR.6 steel: good plasticity and easy processing, widely used in low-pressure and normal-temperature pigging operations. For corrosive media such as sour natural gas and acidic chemical liquids, 304 or 316L stainless steel cylinders can be customized to extend corrosion-resistant service life.

· Stainless steel and duplex steel are optional for seawater and mildly corrosive working environments.

· Insulation performance: Insulation resistance exceeds 25 MΩ at normal temperature. No breakdown occurs under a 5000V voltage test. Product performance exceeds common industrial standards with stable insulation effect.

· Operating temperature: -40℃ to 90℃, adaptable to frigid northern regions, open fields, damp buried areas and low-temperature plateau environments.

· Structural design: Integral forging and welding structure without weak splicing positions. High structural strength enables direct buried installation. No excavation maintenance is required in later service, realizing long-term maintenance-free operation.

2. Applicable Media and Application Scenarios

The product boasts wide compatibility and serves various industrial pipeline projects

Applicable Conveying Media

This insulating joint is compatible with crude oil, refined oil, natural gas, liquefied petroleum gas, industrial wastewater, domestic purified water and conventional neutral chemical fluids. Custom materials are available for acid, alkali and high-salt corrosive media to fit diverse working conditions.

Main Application Scenarios

· Buried long-distance oil and gas pipelines, urban gas distribution pipelines and civil gas supply pipelines

· Oilfield gathering stations, compressor stations, refined oil transmission stations and comprehensive oil-gas processing plants

· Conveying pipelines supporting chemical plants, refineries and energy storage pressure vessels

· Unattended field pipelines, high-altitude low-temperature pipelines and coastal anti-corrosion pipelines

That’s all for today’s introduction. We will share supporting equipment and practical application cases of the Insulating Joint in the next issue.

Feel free to leave messages on the official website for product details, customization solutions and quotations, or contact the factory directly for business negotiations. We provide professional services wholeheartedly.