Double Containment Closures

Double containment closures are specialized couplings used in dual pipe systems to safely and securely join containment pipes. Double containment (DC) closures are used to connect opposing segments of carrier and containment pipes that must be joined together to complete a secondary containment pipeline system. They are typically used where termination fittings are used at system ends and must connect to a fixed point. Double containment closures are engineered to provide an additional layer of protection and ensure leaks or spills from the carrier pipe are contained within the outer containment pipe. DC closure fittings are primarily deployed in applications where hazardous, aggressive chemicals, sensitive, and valuable liquids are transported. Closure fittings provide a unique coupling and safeguard against leaks, critical failures, and release to prevent environmental contamination, protect human health, and comply with regulatory codes and regulations.

Double containment closure sizes range from 2ʺ to 12ʺ in containment diameters. Additional sizes are available on request. Double containment closures come in either SCH 40 or SCH 80 thickness standard. The closures can be used with dual layer pipe, clear pipe, and standard PVC or CPVC pipe. Double containment closures feature a male and female component, each with a gasket seal, and are 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 closure fittings are USA made by Spears Manufacturing®, a trusted manufacturer with decades of experience producing high quality products. DC closures are constructed from premium grade PVC, clear PVC, or CPVC thermoplastic materials for chemical compatibility, durability, and lasting service. They are engineered and tested in compliance with ASTM, ISO, NSF, and UL standards. Their manufacturing and design guarantees product purity, consistency, resilience, and performance. DC closure fittings operate under various temperature and pressure conditions, with a maximum operating temperature of 200°F and pressure per SCH 40 or SCH 80 standards. They can be used in dual pipe systems to meet EPA secondary containment requirements. 

• 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: 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: 2ʺ to 12ʺ 
• Connection Options: Slip on socket solvent weld

Our double containment closure fittings offer enhanced safety with their dual pipe design and system compatibility. Their design prevents environmental release by containing leaks and provides ample time to address and repair problems. They are made from high quality, corrosion resistant materials to provide long lasting performance and durability. The fittings are versatile and suitable for many chemicals, work conditions, and operational needs. They are designed for easy installation and to ensure a secure seal, reducing downtime and labor costs. Double containment closures are engineered to meet strict industry standards to ensure adherence to safety protocols and regulatory compliance for companies and facilities engaged in applications 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 sockets and prefabricated components reduce installation time and labor costs.
• 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 closure fittings are indispensable in the completion of dual pipe systems and environments where the safe transport and containment of onsite fluids is critical. They are commonly used in chemical processing plants for the safe handling of corrosive and toxic chemicals, and in wastewater treatment facilities to prevent leaks and contamination in waste management systems. In pharmaceutical manufacturing, the fittings maintain the integrity of sensitive processes involving aggressive solvents. In industrial manufacturing, they provide reliable containment for operations using hazardous substances and protect valuable or sensitive materials such as those used in semiconductor fabrication.

Ensure the highest safety, reliability, and compliance with our industry leading solutions. Don't compromise on safety — choose double containment 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 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.