 Parallel connection from 2, 4 or 5 Flashback Arrestors model 85-30 WITT Safety groups for reliable protection against dangerous reverse gas flow and flashbacks according to DIN EN ISO 5175-1. For applications with high flow rates. Every safety group 100% tested. Benefits ●● a large surface area flame arrestor FA of stainless steel construction extinguishes any dangerous flashback ●● a temperature sensitive cut-off valve TV extinguishes sustained flashbacks long before the internal temperature of the arrestors reaches a dangerous level ●● a spring loaded non-return valve NV prevents slow or sudden reverse gas flow forming explosive mixtures in the gas supply Operation / Usage ●● in central gas supplies (behind the manifold pressure regulator or in a pipeline system) ●● in thermal processing systems according to EN 746-2 (cutting machines, furnace supply equipment) ●● WITT safety groups may be mounted in any position / orientation in pipelines / supply pipes Max. working pressure [bar] Acetylene (A) Town gas (C) Natural gas (M) LPG (P) Hydrogen (H) Ethylene (E) Oxygen (O) Acetylene (A) Town gas (C) Natural gas (M) LPG (P) Hydrogen (H) Ethylene (E) Oxygen (O) Oxygen (O) ●● the maximum ambient / working temperature is 70 °C / 158 °F Maintenance ●● annual testing of the non-return valve, body leak tightness and flow capacity is recommended ●● safety groups are only to be serviced by the manufacturer Options ●● connection: two-sided female thread (G-; NPT-; RC-thread) Approvals Company certified according to ISO 9001 and PED 2014/68/EU Module H CE-marked according to: - PED 2014/68/EU Designed for Oxygen Service in accordance with EIGA 13/20 and CGA G-4.4: Oxygen Pipeline and Piping Systems Cleaned for Oxygen Service in accordance with EIGA 33/18 and CGA G-4.1: Cleaning of Equipment for Oxygen Service Weight [kg] 68 Steel (stainless steel) Brass Elastomer Order-No. upon request upon request 182-054 upon request Other connections and pressures available upon request WITT Gas Controls LP, 3080 Northfield Place, Suite 111, Roswell, GA 30076, Tel. +1 770-664-4447, Fax +1 770-66

Max. working pressure [bar] Acetylene (A) Town gas (C) Natural gas (M) LPG (P) Hydrogen (H) Ethylene (E) Oxygen (O) Steel (stainless steel) Brass Elastomer Other connections available upon request Note: All flow rates are reduced approx. 50% at the 2- fold models Flow diagram for air (20 °C / 68 °F) Conversion factors: Acetylene x 1.04 Butane x 0.68 Natural Gas x 1.25 Ethylene x 1.02 Methane x 1.33 Propane x 0.80 Oxygen x 0.95 Town gas x 1.54 Hydrogen x 3.75 Standard volume flow [Nm3/h] (1013 mbar / 14.7 psi, 0 °C / 32 °F) Inlet pressure: Pv [bar] Opening pressure: approx. 10 mbar Flow diagram...