Double Inflatable Pipe Weld Purging Systems
Used for 90% of the traditional pipe weld purging applications to provide bright, shiny, oxide free weld roots. The PPM Pipe Purge System is quick and easy to use providing a very rapid weld purge. High quality materials are used in the manufacture of these systems guaranteeing perfect oxide-free weld roots in very little time.
Due to the design of these systems, the volume of gas used to purge is minimized, resulting in significant savings in both time and the quantity of inert gas used. Return on investment can be achieved in as little as just one or two welds. These robust systems can be used over and over again paying for themselves in very little time.
The Purge Bag Systems in the range manufactured by PPM is designed around the principle of using 2 dams to create a seal either side of the weld, just far enough away from the weld not to be affected by heat but close enough to the joint to provide the fastest weld purge time. These dams are connected by an armored spinal tube. Once ready to start purging, the system is inserted into the bore of the pipe using the luminous strip to center the system to the weld gap. When the gas flow is started, the dams inflate and, upon reaching the pre-set pressure, the valve releases the gas gently into the weld chamber, to purge the interspace without turbulence. The Oxygen is removed from the weld chamber through the integral exhaust tubes in the bags. Used in conjunction with PPM’s Oxygen Monitors to indicate when the required low level of oxygen has been reached, welding can then commence, with the inert gas enabling the welder to produce an even oxidation free penetration weld bead. Afterward, the dams are deflated simply by disconnecting the purge gas feed, and the system easily is withdrawn. The design of these systems means that only one gas connection is required for both dam inflation and weld purging.