The correct Gas Pressures are important. Incorrect pressure can increase the risk of Flashback and make Flame Adjustment difficult.

The following Guides should help you

Lightweight & Heavy Duty Swagged Oxy/Acet Gas Welding Nozzles

Lightweight include DH type Oxy Acetylene Nozzles (not pictured)

Heavy Duty includes type 3, 4 & 5 Torches

Nozzle Size - Gas Nozzle Pressures

• No1 - Metal Thickness = 1.0mm - Oxy/Acet Pressures = 0.15bar each
• No3 - Metal Thickness = 2.0mm - Oxy/Acet Pressures = 0.15bar each
• No5 - Metal Thickness = 2.5mm - Oxy/Acet Pressures = 0.15bar each
• No7 - Metal Thickness = 3.2mm - Oxy/Acet Pressures = 0.15bar each
• No10 - Metal Thickness = 4.0mm - Oxy/Acet Pressures = 0.20bar each
• No13 - Metal Thickness = 5.0mm - Oxy/Acet Pressures = 0.30bar each
• No18 - Metal Thickness = 6.5mm - Oxy/Acet Pressures = 0.40bar each

Multi-Jet Oxy Propane/Propylene Nozzles

Nozzle Size - Gas Nozzle Pressures

• No1 - Metal Thickness = 1.0mm - Oxy/Prop Pressures = 0.20bar each
• No3 - Metal Thickness = 2.0mm - Oxy/Prop Pressures = 0.20bar each
• No5 - Metal Thickness = 3.0mm - Oxy/Prop Pressures = 0.25bar each
• No7 - Metal Thickness = 4.0mm - Oxy/Prop Pressures = 0.25bar each

AHT Heating Nozzles

Nozzle Size - Gas Nozzle Pressures

• AHT25 Oxy/Fuel Pressures = 0.30bar each
• AHT50 Oxy/Fuel Pressures = 0.40bar each
• AHT100 Oxy/Fuel Pressures = 0.70bar each

Oxy/Propane Super Heating Nozzles

Nozzle Size - Gas Nozzle Pressures

• 1H Oxy Pressure = 0.7-2.0bar + Propane Pressure = 0.15-0.5bar
• 2H Oxy Pressure = 0.7-2.0bar + Propane Pressure = 0.15-0.5bar
• 3H Oxy Pressure = 1.8-5.0bar + Propane Pressure = 0.3-1.1bar
• 4H Oxy Pressure = 1.8-5.0bar + Propane Pressure = 0.30-1.1bar

Oxy/Acetylene (ANM) Cutting Nozzles

Nozzle Size - Gas Nozzle Pressures

• 1/32″ Cuts 3-6mm Steel - Pressures = Oxy 1.5bar / Acet 0.15bar
• 3/64″ Cuts 5-12mm Steel - Pressures = Oxy 2.0bar / Acet 0.15bar
• 1/16″ Cuts 10-75mm Steel - Pressures = Oxy 2.5-3.5bar / Acet 0.20bar
• 5/64″ Cuts 70-100mm Steel - Pressures = Oxy 3.0bar / Acet 0.30bar
• 3/32″ Cuts 90-150mm Steel - Pressures = Oxy 3.0bar / Acet 0.30bar
• 1/8″ Cuts 150-300mm Steel - Pressures = Oxy 4.5bar / Acet 0.35bar

Oxy/Propane (PNM) Cutting Nozzles

Nozzle Size - Gas Nozzle Pressures

• 1/32″ Cuts 3-6mm Steel - Pressures = Oxy 1.5bar / Prop 0.15bar
• 3/64″ Cuts 5-12mm Steel - Pressures = Oxy 2.5bar / Prop 0.15bar
• 1/16″ Cuts 10-75mm Steel - Pressures = Oxy 3.0-3.5bar / Prop 0.20-0.35bar
• 5/64″ Cuts 70-100mm Steel - Pressures = Oxy 3.5bar / Prop 0.4bar
• 3/32″ Cuts 90-150mm Steel - Pressures = Oxy 4.0bar / Prop 0.4bar
• 1/8″ Cuts 150-300mm Steel - Pressures = Oxy 5.5bar / Prop 0.6bar

I hope you found this blog article about Gas Pressures useful.

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Cheers

Graham

The Welders Warehouse