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Conquest® Butt-Weld Bubble Test Procedures

Experienced, certified CONQUEST fabricators can usually inspect completed CONQUEST butt fusion welds visually with a high degree of accuracy. In some circumstances, it may be desirable to field test CONQUEST Butt-Welds prior to installing the mechanical coupling.

The bubble test procedure allows fabricators to quickly and easily evaluate butt welds nondestructively, to augment their visual inspection.

In cases where fabricators lack experience, or in which owners are not satisfied with a "visual only" inspection, the bubble test should be employed.

CAUTION: This is a low pressure, pneumatic test. Pneumatic tests present hazards associated with the stored energy in the system. Make certain that all pipe spools are securely anchored to prevent dislocation and explosive movement of the pipe in the event of a complete weld failure.

  • Using a cold chisel and hammer, remove the metal ring to expose the inner plastic liner.
  • Slide the flange with the large center hole on the pipe spool.
  • Slide the Victaulic or Grovlosk clamp on to the pipe and position it from end of pipe spool to the dimension from the chart that matches the size of pipe being tested. Tighten the clamp bolts evenly with as much force as can be applied with a hand wrench.
  • Slide flange with large center hole that is already on pipe spool up to the just installed clamp.
  • Put the two long bolts with washers through bolt holes in the flange with large center hole 180° apart. The threaded ends of the bolts should be sticking past the end of pipe spool with exposed liner stub. Bolts should be placed 90° from bolts in Victaulic or Grovlock clamp.
  • Make sure rubber gasket is in grooved flange. Slide grooved flange with air regulator onto the two long bolts and onto end of spool. Guide the exposed liner stub into the circular groove of the flange.
  • Put washer on bolts and spin up nuts finger tight being careful to keep the grooved flange perpendicular to pipe spool.
  • Snug up nuts with hand wrench with 1/2 turn increments, shifting from one side to the other until tight.
  • Make sure small Hoke valve is in closed position.
  • Connect air hose to pressure regulator and pressurize pipe spool. Do not allow regulator to be set higher than twenty (20) psi. this is sufficient pressure to detect leaks.
  • Apply Testox 10 detek instant gas detector on butt weld. If the joint has a leak the detecting fluid will foam.
  • Remove the tester by opening the small Hoke valve (to release internal pressure) and by backing off the regulator to zero psi. Then remove the air supply. After the pressure has been released, the tester can be removed by reversing the order that it was installed by.

Components use for butt-weld
bubble test procedure


Bubble test assembly


Evidence of a bad weld


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