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Weld, Purge & Hydrotest in One Tool

Flange Weld Test Plug (FTP)

Isolate and purge the weld area, weld, and hydrotest the flange-to-pipe weld with one plug in place. A high-lift seal clears the weld zone, so root penetration doesn't need grinding, and you only fill the space you're testing, not the whole line.

3/4"‑24"Stocked Sizes*

150#‑2500#Flange Ratings

CupsNot Truckloads of Water

Rentor Buy

Get A Quick Quote Call (800) 456-8721

*Larger sizes on request.

Flange Weld Test Plug (FTP)‹›

Flange weld test plug shown installed in pipe

FTP Installed in Pipe‹›

Get a Quote or Order

Send us these details and we'll respond the same business day.

Flange rating (150# to 2500#)
Size (3/4" to 24", larger on request)
Pipe schedule
Gasket type
Custom length, if there's a restriction
Quantity needed
Rental or purchase
Date needed

Get A Quick Quote Call (800) 456-8721

Technical Data Sheet

Flange Weld Test Plug

DS-FTP-001 Rev. Current

Specification	Details
Stocked Line Sizes	3/4" – 24" (larger on request)
Flange Ratings	150# • 300# • 600# • 900# • 1500# • 2500#
Flange Faces	Raised Face (RF) • Ring-Type Joint (RTJ) (RTJ built to order)
Pipe Schedules	Fits a wide range of schedules
Seal	High-lift urethane seal (replacements stocked for common sizes)
Back Pressure	Rated to the hydro pressure of the blind flange
Options	Custom lengths • Vent-through
Construction	Rugged, heavy-duty design
Availability	Rent • Purchase

Why the FTP

Test the Weld, Not the Whole Line

High-Lift SealExtra seal-to-pipe clearance past the weld area. No grinding, and fast repositioning.

Weld IsolationIsolate the weld area without filling the whole line or vessel, cutting hazardous waste costs.

Minimal WaterA few cups to a few gallons, depending on line size.

Less EquipmentNo line blinds, vacuum trucks, or dehydration services, and fewer NDE requirements.

Installation

Three Steps to Test

InsertSlide the plug into the pipe to be welded.
Bolt & SealBolt the flanges together and tighten the large compression nut(s) to expand the seal.
Weld, Purge & HydrotestDo all three with the plug in place.

Pressure Testing Solutions

Test Plugs vs. Welding End Caps

Test PlugsWelded End Caps

SpeedInstalls in minutes, ready to test right awayWeld, cool, test, then grind off. Hours per cycle

CostReusable. No welders, consumables, grinding, or NDESingle-use caps, welder labor, consumables, and inspections

SafetyNo hot work permits, arc flash, fumes, or burnsOpen flame and hot metal. Permits, fire watch, and PPE required

FlexibilityReposition and reuse across spools and test setupsPermanently welded. Changes mean cutting off and starting over

Pipe QualityNo heat-affected zone from a cap weldHeat-affected zones, possible distortion, post-weld NDE

The Bottom LineTest plugs turn pressure testing from a bottleneck into a streamlined operation, with speed, savings, safety, and flexibility welded end caps can't match.

Critical Safety ReminderPressure testing is hazardous. Make sure all connections, valves, flanges, and fittings are suitable for the test, and verify the line ID falls within the plug's range. Never stand in front of a test plug or enclosure during testing; a discharge can cause severe injury or death.