Nitrogen gas is a colourless, odourless and tasteless gas that makes up ca 78 % of the Earth’s atmosphere. It does not support combustion & is non-flammable so it is used in certain “blanketing” or ignition prevention applications and for this reason is an asphyxiant.

As a result, it is often thought as being an inert gas  but it is not truly inert.

For instance, Nitrogen forms nitric oxide and nitrogen dioxide with oxygen, ammonia with hydrogen, and nitrogen sulfide with sulfur. Also Nitrogen compounds are formed naturally through biological activity.

Nitrogen is NOT an inert gas and  is slightly lighter than air having a density 1.19 kg/m3 (i.e. 0.99 relative to the density of air at sea level atmospheric conditions) and slightly soluble in water.

It is widely used in many applications as it is cheap and readily available as a by product of the air separation process for producing Oxygen from air. As a result of this manufacturing process, Nitrogen is also food safe with a corresponding level of  certification.

 

Applications

  • Gas “blanketing” to prevent ignition in certain applications
  • Moderate temperature inert atmosphere
  • Food preservation
  • Incandescent bulb manufacture
  • Fire safety systems
  • In the production of Stainless steel
  • Large mining vehicle tyres for increased safety
  • Chemical and fertiliser aplications
  • leak testing & instrument calibration
  • Instead of compressed air in pneumatic systems and tools
  • Production and storage of alcoholic beverages
  • As a gas carrier for particulate matter

 

Product Overview

Nitrogen gas is a colourless, odourless and tasteless gas that makes up ca 78 % of the Earth’s atmosphere. It does not support combustion & is non-flammable so it is used in certain “blanketing” or ignition prevention applications and for this reason is an asphyxiant.

As a result, it is often thought as being an inert gas  but it is not truly inert.

For instance, Nitrogen forms nitric oxide and nitrogen dioxide with oxygen, ammonia with hydrogen, and nitrogen sulfide with sulfur. Also Nitrogen compounds are formed naturally through biological activity.

Nitrogen is NOT an inert gas and  is slightly lighter than air having a density 1.19 kg/m3 (i.e. 0.99 relative to the density of air at sea level atmospheric conditions) and slightly soluble in water.

It is widely used in many applications as it is cheap and readily available as a by product of the air separation process for producing Oxygen from air. As a result of this manufacturing process, Nitrogen is also food safe with a corresponding level of  certification.

 

Applications

  • Gas “blanketing” to prevent ignition in certain applications
  • Moderate temperature inert atmosphere
  • Food preservation
  • Incandescent bulb manufacture
  • Fire safety systems
  • In the production of Stainless steel
  • Large mining vehicle tyres for increased safety
  • Chemical and fertiliser aplications
  • leak testing & instrument calibration
  • Instead of compressed air in pneumatic systems and tools
  • Production and storage of alcoholic beverages
  • As a gas carrier for particulate matter

Hazards

The single greatest risk to workers using Nitrogen gas is asphyxiation when carrying out large tank purging or working in confined spaces which have been previously purged.

With Cryogenic liquid Nitrgogen there is a very significant danger of workers involved when still cold weather conditions as and liquid Nitrogen that escapes forms large localised concentrations of gaseous Nitrogen and asphyxiation under these cases is rapid with the individual(s) becoming unconscious & if not rescued by Emergency Workers wearing Air Breathing apparatus then death follows if the Nitrogen gas has not dissipated.

There have been cases of fellow workers nearby (Without Air Breathing apparatus.) going to the scene to provide assistance also loosing consciences and sadly dying.

As mentioned in the Overview above, it forms 78% of the air we breathe so if used in a well ventilated area it is safe to use as it is non-toxic and non-flammable.

Cylinder Sizes

Specifications

C

D

E

G

12 Pack

Contents weight (m3)

0.6

1.9

4.5

9.5

120

Cylinder pressure (101.325kPa @15°C) **

19000

19000

19000

19000

20000

Cylinder water capacity (L)

3

10

23 - 25

50

600

Cylinder colour

Pewter

Cylinder connection type

Type 50

 

The volume and the pressure of the contained gas in the cylinders will be as specified in  the above table.

**Cylinder contents pressure is referenced at 15 Deg Celsius. Hence, the pressure in the cylinders can vary depending upon the ambient temperature.

Important information

    STORAGE HANDLING & LEAKS

    • Gas cylinders (particularly G & E size) are unstable & must be stored in pallets or racks when not in use & secured when in use by a strap or chain against a wall or secured by a suitable trolley with chain or strap.
    • Use appropriate materials for chains. e.g. plastic coated wire cable, commercial straps, with tensioners,… etc., to secure cylinders.
    • Gas cylinders should not be stored in public hallways or other unprotected areas
    • Store out of direct sunlight and away from sources of heat and ignition; temperatures must not exceed 50 °C.
    • Where cylinder caps are fitted to cylinders (i.e. instead of Cylinder Valve guards.) refit these cylinder valve caps to the Cylinder thread when the cylinder is not in use.
    • Cylinders should be protected from damage. Do not store cylinders near elevators or gangways, or in locations where heavy-moving objects may strike or fall on them or knock the cylinder over.
    • Cylinders must be stored on surfaces such as suitably drained concrete to prevent the base of the cylinder from rusting from standing in puddles for long periods. Cylinders should be stored, secured in premises to protect them from theft & against tampering by unauthorized individuals.
    • Storage areas must be well-ventilated, cool, dry, and free from corrosive materials.
    • Open (Anti clockwise looking down at the hand wheel, directional arrows are on the hand wheel.) or close a cylinder valve (Clockwise looking down at the hand wheel, directional arrows are on the hand wheel.) by hand using moderate torque to open or close them.  Too much closing torque can damage the cylinder valve seat. Only use set spanners or specific tools that are provided by the cylinder supplier to connect accessories. Multi-grips should never be used. Some regulators require a sealing washer in or on the inlet spigot. Check that this is present before fitting the regulator to the cylinder valve outlet
    • Make sure the cylinder when used is matched with the correct regulator and end connectors and of appropriate pressure rating.
    • Inspect the regulator and cylinder valve connections to make sure that they are not contaminated with grease, oil, dirt, water or solvents. Never use grease or oil to lubricate regulators or cylinder valves as this will contaminate the gas.

     

     

    Handling leaks

    • If closing the Cylinder Valve does not stop the leak, then relocate the cylinder to a safer well ventilated or outdoor location to allow the venting gas to escape & not build up. i.e. Per Puregas Safety Guidelines.
    • Do not enter an area with high gas leakages without proper PPE or safety equipment.
    • Approach the leak only if qualified to do so.
    • Use readily available techniques like the soap bubble method to detect the leak.
    • Return the empty cylinder if the leak persists or after the gas has been safely vented.
    • Make sure the cylinder is properly tagged indicating the nature, location & date of the leak together with a contact name & phone number for follow up by the gas supplier.