PB18 18" Purge Bag System

Pipe Purge Masters PB18 18" Purge Bag System is a lightweight, inflatable double purge bag solution designed for efficient weld purging in industrial piping applications. Featuring two inflatable dams connected by an armored spinal tube, this system creates a sealed chamber around the weld joint to allow rapid inert gas displacement, preventing oxidation and discoloration on pipes from 17.91" to 19.29" (455-490 mm I/D). Ideal for on-site or workshop use with stainless steel, duplex, and exotic alloys, it reduces purge times dramatically while ensuring a clean, high-quality weld root.

• Model Number: PB18
• Product Type: Inflatable Double Purge Bag System
• Color: Red (dams), black (spinal tube)
• Material: High-strength rubber dams with armored spinal tube
• Nominal Pipe Size: 18" / 450 mm
• Internal Diameter Range (I/D): 17.91" - 19.29" / 455 - 490 mm
• Inflation Pressure: 0.3 bar / 4.3 psi (recommended for sealing without damage)
• Weight (Net): 3 lbs / 1.45 kg
• Overview: Double-bag system for rapid weld purging; dams seal either side of the weld joint via armored spinal tube; ideal for stainless steel, duplex, and exotic alloys in fabrication shops, construction sites, and maintenance operations
• Key Features:
  • Rapid purging: Achieves low oxygen levels in minutes (e.g., 1½ mins for 4" pipe equivalent); luminous strip on spinal tube for easy positioning in low-light conditions
  • Secure sealing: Inflatable dams create a contained chamber for inert gas; armored tube prevents damage during insertion
  • Versatility: Suitable for straight pipes; optional extensions for longer reaches; compatible with argon or other inert gases
  • Durability: High-strength materials resist wear and pressure; reusable with proper maintenance; heat resistant up to 70ºC (158ºF) continuously
  • Safety: Low inflation pressure minimizes bag rupture risk; includes pressure relief valve; fittings: International = 21 KA series male connector; Americas = ¼" (0.25") NPT male connector
  • Eco-Friendly: Reduces gas consumption for sustainable operations
• Packaging: 1 System per Unit; Includes two inflatable dams, armored spinal tube with luminous strip, inflation hose connectors, and user manual; Compact storage bag for portability
• Storage: Cool, dry place away from direct sunlight and extreme temperatures; shelf life up to 5 years under proper conditions
• Compliance: Meets industry standards for weld purging systems (e.g., ASME equivalents for safe gas handling)