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Nitrogen 3.0 grade is predominantly used for purging.

Product information

For nitrogen the following is valid:

  • 1 nm3 = 1.147 kg
  • 1 kg = 0.872 nm3
  • 1 bar = 14.5 psi
  • 1 nm3 = 35.3 ft3
  • 1 kg = 2.2 lbs

The gas capacity of a cylinder can calculated in two different ways. The most simple method is the water capacity of the cylinder (in litres) multipled by the actual pressure (in bar); the result is the capacity in litres. Although a simple method it is not the most accurate method. A better but much more complex method will give a more accurate value for the gas capacity; it will take the compressability of the gas at both 1 bar and at the actual pressure in consideration and all based on 15 degrees C. The result is often quoted as normal litres or normal cubic metres (nm3). For nitrogen the more accurate method will give a slightly higher value as compared to the simple method i.e. (10.2 m3 versus 10 nm3).


  • Nitrogen is a colourless, odourless and tasteless
  • Non-combustible and non-toxic
  • Slightly lighter than air and it's an inert gas
  • Nitrogen is well suited for purging or flushing cargo tanks and pipelines of residual gases and vapours prior to loading cargo
  • It is also used as a 'blanket' on top of several types of cargoes to prevent reactions with oxygen from atmospheric air.
  • The filling pressure is lower in some locations than the normal 200 bar due to local rules and regulations that limit filling pressure.
  • Nitrogen 3.0 means > 99.9% pure and the impurities: Water (H2O) < 1000 ppm and Oxygen (O2) < 1000 ppm.


  • For your safety, the product is delivered in a Unitor cylinder complete with barcode and unique cylinder serial number
  • We trace and track all cylinders using the UniTrak system to give you peace of mind



Cylinder Type N-50

Physical properties

Colour green


Diameter [mm] 230
Gross Weight [kg] 92
Height [mm] 1690
Weight [kg] 11.5 Net

Technical data

Connection [inch] W24.32mm x 1/14" RH Ext side
Filling pressure [bar] 200
Volume (l) 50

Performance data

Gas Capacity [m³] 10.2


Product name Product number Diameter [mm] Gross Weight [kg] Height [mm] Weight [kg] Cylinder Type Gas Capacity [m³] Colour Connection [inch] Purity Volume (l)
NITROGEN N-1030 FILLING 905232 140 20 1000 2.3 N-10 2 Green W24.32mm x 1/14" RH Ext 3.0 >99.9% 10
NITROGEN N-1050 FILLING 905602 140 20 1000 2.3 N-10 2 Green with orange shoulder W24.32mm x 1/14" RH Ext 5.0 > 99.999% 10
NITROGEN N-5030 FILLING 905208 230 92 1690 11.5 N-50 10.2 green W24.32mm x 1/14" RH Ext 50
NITROGEN N-5050 FILLING 905601 230 92 1690 11.5 N-50 10.2 Green with orange shoulder W24.32mm x 1/14" RH Ext 50