Flange Weld Test Plugs

Flange Weld Test Plugs & Isolation Plugs

Steam, Sniff, Purge, Weld and Test 

All With The Same Plug

  • Operating Pressures to ANSI B16.5 Requirements
  • Pipe Sizes from 3/4″ to 36″
  • Flange Classes 150-600 lb. Higher Classes Available – Contact Us
  • All Flange Styles Improved Seal-to-Pipe Clearance



Flange Weld Test Plug reduces the expense, downtime delays, and waste disposal problems associated with conventional flange-to-pipe weld testing. Our High Lift Flange/Weld Test Plug lets you monitor downstream conditions, isolate and purge the weld area, perform the weld, and hydro test weld joint to ANSI B16.5 requirements using only one tool. No blind flanging upstream, no vacuum truck for evacuating the line, and no X-raying. Just a simple, rock-solid tool that saves time and money every time you use it. In many applications the plug pays for itself many times over in the first use. Each test requires a minimum amount of water, and there’s no need to fill the entire line. You’ll use less water,and minimize your environmental liabilities.  

High Lift Flange Weld Test Plugs – Quickly test flange weld joints

Flange Weld Isolation Plug – FEATURES & BENEFITS

  • Fast, Easy Installation and Testing.
  • Faster Pipe Repairs and Retrofits.
  • Improved Seal-to-Pipe Clearance: Plug can be easily installed and removed, even where there is severe weld protrusion.
  • Reduces NDE.
  • Low Water Requirements: Results in less waste water.
  • Safe: A minimum of 1.5:1 safety factor.
  • Rugged: Heavy-duty construction.
  • Segmented Compression Tube: Allows adjustment of seal installation depth.
  • Versatile: Seal and washer sets easily change to accommodate different pipe schedules.
  • Ported Center Shaft: Permits monitoring of downstream pressure of inert gas rejection.
  • Super Stock: Sizes from 3/4″ to 12 ” are available for same day or next day shipment.
  • Seal Materials: Urethane Standard.
  • Quality Assurance System: Manufactured under a Quality Assurance Program certified to ISO 9001:2015 and several U.S. nuclear industry standards including ANSI N45.2, NQA-1, 10CFR 50 Appendix B, and 10CFR 21.

Have a look at our range of isolation Plugs and our Double Block and Bleed Plugs

Curtiss Wright EST Flange Weld Test Plug