The hazard level of the gases increases from gas group IIA to IIC with group IIC being the most severe. Substances in this group can be ignited very EASILY with Hydrogen being the most at risk to ignition. The TEMPERATURE class is based on the auto-ignition temperature of the gas.

If a hazardous is present the equipment used within the installation must be given an appropriate “T” CLASSIFICATION in order to maintain the integrity. If that hazardous is, say, hydrogen, then all equipment used must meet the “T6” rating. This means that all equipment used must not have a surface temperature of GREATER than 85˚C. Any equipment used that can GENERATE a hotter surface temperature of greater than 85˚C must not be used as this will then increase the likelihood of an explosion by igniting the hydrogen in the atmosphere.

The hazard level of the gases increases from gas group IIA to IIC with group IIC being the most severe. Substances in this group can be ignited very easily with Hydrogen being the most at risk to ignition. The temperature class is based on the auto-ignition temperature of the gas.

If a hazardous is present the equipment used within the installation must be given an appropriate “T” classification in order to maintain the integrity. If that hazardous is, say, hydrogen, then all equipment used must meet the “T6” rating. This means that all equipment used must not have a surface temperature of greater than 85˚C. Any equipment used that can generate a hotter surface temperature of greater than 85˚C must not be used as this will then increase the likelihood of an explosion by igniting the hydrogen in the atmosphere.