The PPM 4" Inflatable Pipe Double Purge Bag System is an advanced solution designed for achieving oxidation-free penetration weld beads in pipe welding. This system utilizes two inflatable dams, connected by an armored spinal tube, to create a secure 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 bore, with a luminous strip aiding in precise centering 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, purging the interspace without turbulence. Integral exhaust tubes within the bags efficiently remove oxygen from the weld chamber, facilitating the production of high-quality, oxidation-free welds. For optimal results, the system can be used in conjunction with PPM’s oxygen monitors to confirm the required low oxygen levels before welding commences. Designed for efficiency, this purge bag system requires only a single gas connection for both dam inflation and weld purging. After welding, the dams are easily deflated by disconnecting the purge gas feed, allowing for quick withdrawal of the system. The 4" Inflatable Pipe Double Purge Bag System is suitable for nominal pipe sizes of 4 inches (100 mm) and accommodates internal diameters ranging from 3.51 to 4.51 inches (89 to 115 mm). It comes equipped with universal fittings, including an International 21 KA series male connector and an Americas ¼" (0.25") NPT male connector, ensuring broad compatibility. 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: Single connection for inflation and purging • Nominal Pipe Size (Imperial): 4" • Nominal Pipe Size (Metric): 100 mm • Internal Diameter Range (Imperial): 3.51 - 4.51" • Internal Diameter Range (Metric): 89 - 115 mm • International Connector Type: 21 KA series male connector • Americas Connector Type: ¼" (0.25") NPT male connector • Expansion Range: 35 mm / 1.37" (for custom solutions) • Product Weight: 1 lbs / 0.34 kg
