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Self-Contained Breathing Apparatus | SG-220

Supplier: Siebe Gorman

The Siebe Gorman model SG-220 is a standard industrial positive pressure open circuit Self Contained Breathing Apparatus.


It is designed to be used in fire fighting, oil and gas, damage control and other areas where normal respiration is not possible.

The SG-220 comprises a facemask, demand valve, backframe, breathing pneumatics, harness, cylinder & cylinder valve assembly.


Facemask and Demand Valve Assembly:

A SG-220 uses a lightweight and comfortable Facepiece with Air Switch Demand Valve, By-Pass Valve and a Nomex Net Head Harness. The facemask consists of an outer Silicone mask with Silicone reflex edge face seal. The visor is made of a scratch resistant, moulded double curve Polycarbonate, with an anti-mist coating.

The facemask and demand valve are completely submersible for total cleaning and sanitising to the latest OSHA regulations.


The SG-220 pneumatics assembly comprises a reducing pressure valve, hose assembly, low pressure warning whistle and pressure gauge with the following features:

  • First stage piston reducer valve.
  • Pre-set to supply reduced pressure of 6.5 to 8.0 bar.
  • Automatic pressure relief valve to relieve pressure by 10 to 15 bar.
  • High pressure Hose, ETFE Reinforced stainless steel, braided with a working pressure of 300 bar.
  • Medium pressure Hose in Flame Retardant EPDM Material, textile braided with a working pressure of 28 bar.
  • Pressure gauge, waterproof with a luminescent scale, rubber shroud and able to rotate 360°
  • Low pressure warning whistle operates at 55 bar with a continuous tone above 90 dba and swivels to 360º

Backframe and Harness Assembly:

The SG-220 comes with a fire retardant Backframe Assembly. It is wear resistant, lightweight and ergonomically designed to evenly distribute the weight.

The harness set consists of padded shoulder straps, a full comfort back pad and adjustable cylinder strap.

Kevlar webbing is used in the harness, while the shoulder straps and backpad are covered in Nomex.