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Gas Nozzle Pressures

Friday, 11th December 2020
Graham (Tech Advisor)
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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.

Please let me know what you thought by leaving a comment.  

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Cheers

Graham

The Welders Warehouse

2 responses to “Gas Nozzle Pressures”

  1. Peter Barnsby says:

    Hi what pressure would you recommend for the oxy3000 kit to weld lead, the same as above ? Thanks

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