Double Block and Bleed Isolation & Testing Pipe Plug
Positively Isolate and Test Pipe Connections - Available to rent or purchase.
STANDARD DOUBLE BLOCK & BLEED SPECS:
- Standard Size Range: 3/4" to 24" NPS; larger sizes available upon request
- Working Pressure: Up to 2,500 PSI (172.4 Bar) between seals
- Body Construction: Lightweight aluminum/steel assembly for strength and portability
- Seal Material: High-performance urethane seals
- Portability: Compact, easy to position, and designed for quick deployment
- Pipe Protection: Will not damage internal pipe walls during installation or removal
- Efficiency: Reduces repair and weld-testing time and associated labor costs
- Purge Reduction: Minimizes purge gas usage and waste generation
- Water Usage: Requires less than one gallon of water, reducing fill time, waste, and treatment costs
- Testing Requirements: Only a small test volume needed—compatible with simple hand pump operation
- Safety: Built-in safety factor helps reduce NDE requirements
- Monitoring Capability: Allows monitoring of isolation zone and upstream pressure to prevent backpressure during testing
Optional Additional Technical Points
- Seal Redundancy: Dual-seal configuration provides enhanced isolation integrity
- Pressure Relief Port: Bleed/vent port to safely remove trapped pressure
- Application Flexibility: Effective for hydrostatic testing, weld isolation, and temporary line blocking in maintenance environments
To Order Call: (800) 456-8721 — Specify:
- Size
- Pipe Schedule
- Quantity Needed
- Rental or Purchase
- Necessary Delivery Date
USA Industries' Double Block & Bleed (DBB) pipe plug is built with two separate sealing areas that allow the user to positively isolate upstream gases from internal piping. As a result of this design, it makes performing modifications, repairs and hot work much safer, quicker and easier. The Double Block & Bleed plug also has a vent between the compression seals that lets the user verify the seals' integrity and pressure test the hydrotest welds by positioning the weld between the two seals.
HOW THE STANDARD DOUBLE BLOCK & BLEED WORKS
After determining pipe and schedule size:
- Install DBB plug upstream of "hot work" area
- Expand seals by tightening compression nut(s)
- Inject inert gas or water between seals (isolation zone) and pressurize
- Monitor isolation zone and upstream pressure during "hot work"
- After weld cools release pressure and seal, reposition isolation zone over weld area
- Pressurize isolation zone (up to 2,500 psi (172.4 Bar))
In addition to making hot work safer, quicker and easier, USA Industries manufactures our isolation and test plugs under a strict quality assurance system. All plugs are certified to ISO 9001 standards.
Custom 44" Double Block and Bleed Isolation Plug from USA Industries
Ask Us About our Double Block & Bleed, Best-In-Class GripSafe®ST Test Plug
A Critical Reminder: Conducting pressure testing poses significant hazards, demanding strict adherence to safety protocols. Ensure all connections, valves, flanges, and fittings are suitable for pressure testing. Verify the compatibility of line ID & Plug Range. Most importantly, never position yourself in front of a test plug or enclosure during testing. Discharge from a plug during testing could result in severe injury or fatality.
Related Documents
Frequently Asked Questions
Yes! The Double Block & Bleed plug has a vent in between the compression seals that lets you to verify the seals integrity and pressure test / hydrotest welds by positioning the weld between the two seals.
The DBB plug operates in working pressures to 2,250 PSI (155.2 Bar). Use it to monitor isolation zone and upstream pressure, preventing backpressure build-up during tests.
The sealing material is made of urethane.
Our standard urethane seals continuous operating temperature are rated at 180°. We also offer high-temperature seals upon request.
Yes, we have several extended reach sizes available. Just let us know what reach you need.