Double Block and Bleed Test / Isolation Plug

Positively Isolate Explosive Vapors from Hot Work Areas When Performing Modifications and Repairs

Positively isolate and monitor potentially explosive vapors during hot work, then effectively hydrotest the new weld connection with one tool. The dual port creates a positive pressure barrier between the seals - safely isolating the hot work from any residual upstream gases.

Lightweight aluminum/steel construction makes our DBB plug significantly lighter than other plugs on the market, often allowing operators to circumvent the use of cranes and/or other lifting devices, which can be in high demand during turnarounds. Our 8” schedule 80 plug weighs just 36lbs (16.3kg) compared to other plugs weighing in excess of 100lbs (45.4kg) of the same size.

Test Pressure:

  • 2250 PsiG (155 BarG)
  • Upstream pressure rated to 10 PsiG (0.7 BarG)

Size Range: 3/4” to 48” NPS (DN20 to DN1200) - larger sizes available upon request

Standard Seal Material: Urethane – alternative materials available upon request


  • Monitor potentially explosive vapors during hot work
  • Dual port system allows water to be circulated between seals, providing improved cooling during pre/post weld procedures
  • Creates a positive pressure barrier between seals
  • Lightweight, aluminum and steel construction
  • Perform pressure tests with less than a gallon (3.8L) of water - reducing fill times, and waste/treatment expenses


Double Block and Bleed Test / Isolation Plug
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