The overwhelming need for reliable hoses for critical applications has led to the development of a double containment hose. Two barriers of polytetrafluoroethylene (PTFE) protect the environment, personnel and equipment from the hazardous chemicals being conveyed. PTFE tubing is reinforced with two layers of Alloy C276 (N10276) wire braid, which terminate with Alloy 400 (N04400) or Alloy C276 end connections. Advantages of the design include containment in the event of a leak in the
primary tubing, monitorability of the interstitial space, extended service life, corrosion resistance, superior burst strength, vacuum resistance, kink resistance and product purity. Monitorability is achieved through a vent port containing a unique Alloy C276 porous disc. Keywords: double contaimnent, polytetrafluoroethylene, polyvinylidene fluoride, fluoropolymers, hoses, anhydrous hydrogen chloride, piping