In demanding industrial pipeline systems, ordinary rubber expansion joints may not withstand extreme pressure conditions. Recently, we completed a customized special length wrapped double sphere rubber expansion joint project and successfully performed a 1.5 times hydrostatic pressure test with 90kg pressure holding on-site.
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The customized wrapped double sphere rubber expansion joint was specially designed for 6MPa pressure applications. After undergoing a 1.5 times pressure inspection, the product maintained excellent sealing performance and structural stability without leakage or deformation.
High-quality rubber expansion joints require not only advanced manufacturing technology but also strict testing procedures.
What Makes Wrapped Rubber Expansion Joints More Durable?
Pressure resistance is one of the most important factors for industrial rubber expansion joints.
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Wrapped rubber expansion joints are reinforced with high-strength cord fabric and external winding layers, significantly improving their pressure-bearing performance and service life.
Compared with ordinary molded rubber joints, wrapped structures provide stronger anti-explosion capability and better durability in high-pressure environments. The double sphere design further enhances flexibility, allowing larger movement compensation and better vibration reduction for pumps and pipeline systems.
This type of expansion joint is widely used in HVAC systems, chemical plants, water treatment systems, and industrial pumping stations.
Why Was a 1.5 Times Pressure Test Required?
Customers operating under high-pressure conditions usually require additional safety verification before installation.
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To ensure operational safety, the customized rubber expansion joint was tested at 1.5 times its rated working pressure, reaching a 90kg pressure holding condition during the hydrostatic test.
The pressure was gradually increased using professional hydraulic equipment while engineers carefully inspected the flange area, reinforcement layer, and rubber body condition. The product maintained excellent sealing capability throughout the entire test process.
This strict inspection standard proves the product’s reliability for demanding industrial applications and reduces future maintenance risks for customers.
What Are the Benefits of a Double Sphere Structure?
The structure design of a rubber expansion joint directly affects its flexibility and vibration isolation performance.
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Double sphere rubber expansion joints offer larger axial and lateral movement compensation compared with single sphere models, making them ideal for complex piping systems.
The dual arch structure helps absorb vibration generated by pumps, compressors, and industrial machinery while reducing pipeline stress and operating noise. Combined with wrapped reinforcement technology, the product achieves both excellent flexibility and outstanding pressure resistance.
For projects with limited installation space or special requirements, customized lengths and flange standards can also be provided.
How to Select the Correct Rubber Expansion Joint for High Pressure Pipelines?
Selecting the wrong expansion joint can lead to premature failure and expensive maintenance costs.
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Key selection factors for high-pressure rubber expansion joints include working pressure, temperature, medium compatibility, installation length, and connection standards.
For oil, chemical, or hydraulic systems, high-strength wrapped rubber expansion joints are often recommended. Optional control rods and limit devices can also improve operational safety under extreme pressure conditions.
We support OEM and customized production according to customer drawings and technical specifications, including EPDM, NBR, and other rubber material options.
Professional Manufacturer for Customized Rubber Expansion Joints
As industrial systems become more complex, more customers are requesting non-standard rubber expansion joint solutions.
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Customized rubber expansion joints can be designed according to actual working conditions, including pressure ratings, flange standards, structure length, and rubber materials.
With more than 30 years of manufacturing experience, we provide professional solutions for vibration isolation and pipeline compensation applications. Each product undergoes strict quality inspection and pressure testing before shipment.
Feel free to contact us with your drawings or project requirements for professional support.
Contact Us
Shanghai Songjiang Vibration Absorber Co., Ltd.
Songjiangflex
Email: [email protected]
Website: Songjiangflex Official Website
Reliable pressure testing creates safer pipeline systems and longer product service life.
