The PPM 12-inch Inflatable Pipe Double Purge Bag System is an advanced solution designed for efficient and high-quality weld purging. This system utilizes two robust dams, connected by an armored spinal tube, to create a precise seal on either side of the weld joint. These dams are strategically positioned to be far enough from the weld to avoid heat effects, yet close enough to ensure the fastest possible weld purge time. Operation is straightforward: the system is inserted into the pipe's bore, with a luminous strip aiding in centering it accurately to the weld gap. Once the gas flow begins, the dams inflate, and upon reaching a pre-set pressure, a valve gently releases inert gas into the weld chamber. This controlled release purges the interspace without turbulence, effectively removing oxygen through integral exhaust tubes within the bags. This process enables welders to consistently produce even, oxidation-free penetration weld beads. For optimal results, the system can be used in conjunction with PPM’s oxygen monitors, which indicate when the required low oxygen levels have been achieved, signaling that welding can commence. After welding, the dams are easily deflated by simply disconnecting the purge gas feed, allowing for quick withdrawal of the system. A key design feature is its single gas connection, streamlining both dam inflation and weld purging. The 12-inch Inflatable Pipe Double Purge Bag System is equipped with versatile fittings, including an International 21 KA series male connector and an Americas ¼" (0.25") NPT male connector, ensuring broad compatibility. This specific model is designed for nominal pipe sizes of 12 inches (300 mm) and accommodates internal diameters ranging from 11.03 to 12.39 inches (280 to 315 mm). It weighs approximately 2 lbs (1.10 kg). Larger sizes and custom solutions are available upon request, offering a 35 mm / 1.37" expansion range. SPECIFICATIONS • System Type: Purge Bag system • Dam Configuration: 2 dams connected by armoured spinal tube • Gas Connection Requirement: Single connection for inflation and purging • International Connector Type: 21 KA series male connector • Americas Connector Type: ¼" (0.25") NPT male connector • Nominal Pipe Size (Imperial): 12" • Nominal Pipe Size (Metric): 300 mm • Internal Diameter Range (Imperial): 11.03 - 12.39" • Internal Diameter Range (Metric): 280 - 315 mm • Weight: 2 lbs / 1.10 kg
