Flange Weld Test (FTP) Pipe Plugs

Clear, Purge, Weld and Test Lines - Available to rent or purchase.

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The Flange Weld Test Plug (FTP) by USA Industries simplifies the welding process by allowing you to monitor conditions, isolate and purge the weld area, and complete the weld and hydrotest to meet code requirements—all with one tool. The FTP features a high-lift seal that expands, providing a greater seal-to-pipe clearance. This eliminates the need to grind excess root penetration, making it convenient to move past the weld.

Installation is fast and easy. Simply insert the plug into the pipe to be welded, bolt the flanges together, and tighten the large compression nut(s) to expand the seal. The weld area is fully isolated, eliminating the need to fill the entire line or vessel. This not only simplifies the process but also reduces hazardous waste disposal costs. The FTP requires only a minimal amount of water for testing, ranging from a few cups to a few gallons depending on the line size. By reducing costs, downtime delays, and environmental impact, the FTP eliminates the need for line blinds, vacuum trucks, or dehydration services. It also minimizes non-destructive examination (NDE) requirements.

A word of caution: Pressure testing can be hazardous, and safety precautions must be strictly followed. Check all connections, valves, flanges, and fittings for suitability to test pressure. Ensure the line ID and Plug Range match. Importantly, never stand or pass in front of a test plug or enclosure during the test, as serious injury or death could occur if the plug discharges.


  • Line sizes 3/4" to 24" stocked
  • Flange ratings 150# - 2500#
  • Raised-Face (RF) or Ring-Type-Joint (RTJ) Availability
  • Faster pipe repairs and retrofits
  • Safe and easy installation and testing
  • Minimal water use, less handling and waste
  • Reduces testing, downtime, waste disposal costs
  • Easily accommodates different pipe schedules

Pipe Schedule Chart Link

Flange Test & Welding
Plug Operating Manual

Frequently Asked Questions

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.

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