Double Containment Union Closures

Double containment union closures are specialized connectors used in dual pipe systems to join containment pipes securely. These closures are used to link opposing segments of carrier and containment pipes to complete a secondary containment pipeline system. Typically employed where termination fittings connect to a fixed point at system ends, double containment union closures work to seal the gap and provide the necessary layer of protection. The union part of the fitting allows easy disassembly and reassembly for maintenance and inspection without needing to cut, perform complex repairs, or disrupt the entire system. Primarily used in applications involving hazardous or aggressive chemicals, as well as sensitive and valuable liquids, these fittings provide a unique coupling mechanism and secondary containment that safeguards against leaks, critical failures, and environmental releases. This protection is essential for preventing contamination, protecting human health, and ensuring compliance with regulatory standards.

Double containment union closures come in 4ʺ and 6ʺ size diameters. Additional sizes are available on request. Double containment union closures can be used with standard, dual layer, and clear PVC or CPVC pipe. Double containment union closures feature a central union nut and two end components, each with a gasket seal, intended for solvent cement joints. Gasket o-rings can be used as a cement wiper to improve solvent cement distribution during installation. One step type cement is recommended for rapid, secure assembly. 

Double containment union closures are made in the USA by Spears Manufacturing®, a renowned leader in high quality fittings with decades of experience. DC union closures are fabricated from industrial grade PVC or CPVC thermoplastic, offering excellent chemical compatibility, durability, and service life. They are engineered and rigorously tested to meet ASTM, ISO, NSF, and UL standards to guarantee product purity, consistency, resilience, and outstanding performance. The fittings are designed to operate under various temperature and pressure conditions and can handle temperatures up to 140°F (PVC) or 200°F (CPVC). They are engineered for dual pipe systems and compliance with secondary containment regulations to provide a reliable and secure solution for demanding applications.

• Material Profile: PVC Type I Class 12454 or CPVC Type IV Class 23447 
• Material Options: PP or PVDF may also be available on request
• Type: Union closure coupling
• Color: White, clear, or dark gray
• ASTM Standards: D1784, D2466, D2467, F439, F2618, D3034, E84
• Certifications: NSF 14, NSF 61, UL 94
• Pressure: Full SCH 40 or SCH 80
• Temperature: PVC: 140°F (60°C), CPVC: 200°F (93°C)
• Sizing Standard: SCH 40 and SCH 80 
• Size Options: 4ʺ to 6ʺ 
• Connection Options: Slip on socket solvent weld, union nut

Our double containment union closures provide superior safety due to their professional manufacturing, innovative design, and broad compatibility in dual pipe systems. They are engineered to effectively prevent environmental leaks by containing any breaches and allow sufficient time for issues to be addressed and repaired. The fittings are constructed from high quality, corrosion resistant materials that offer long lasting performance and durability. They are highly versatile and suitable for a wide range of chemicals, operating conditions, and specific operational requirements. They are engineered for easy installation, creating secure seals, and improving the ability to perform maintenance and system repair to minimize downtime and labor costs. Double containment union closures meet stringent industry standards to ensure compliance with safety protocols and regulatory requirements for companies and facilities handling hazardous or regulated liquids.

• Enhanced Safety: Dual containment design provides a secondary barrier against leaks to protect both personnel and the environment.
• Chemical Resistance: PVC and CPVC materials for compatibility with a wide range of corrosive chemicals.
• Durability: Engineered for long term performance with high impact and stress resistance.
• Leak Detection: Compatible with various leak detection systems for proactive maintenance and preventative safety.
• Ease of Installation: Slip on ends, gaskets, and union connection provides straightforward installation.
• Lightweight: Low weight synthetic makes for easy transport and installation.
• Compliance: Built to meet regulatory codes for containment and release prevention for applications handling hazardous materials.

Double containment union closures are essential components in the installation and operation of dual pipe systems and environments where the safe conveyance and containment of onsite fluids are paramount. Common applications and uses include chemical processing facilities for the secure handling of corrosive and toxic substances, in wastewater treatment plants to prevent leaks and contamination within waste management systems, within the pharmaceutical industry to maintain the integrity of sensitive processes involving aggressive solvents, and for dependable containment in industrial manufacturing settings that handle hazardous materials, high valuable solutions, ingredients, or sensitive liquids.

Ensure the highest safety, reliability, and compliance with our industry leading dual pipe fittings. Don't compromise on safety — choose double containment union closures for unparalleled protection and performance of critical pipelines that handle hazardous or corrosive chemicals and application materials. Explore our extensive product range and discover the difference PVC Pipe Supplies can offer with our professional products and lowest price guarantee. Contact us today to learn how our double containment union closures can protect your operations, meet regulatory compliance, and provide peace of mind. Reach out to our expert team for information, price quotes, and details on contractor pricing and bulk discounts.