Flash-Point & Auto-Ignition Temperature
An Actor with natural talent for playing villainous roles
Temperature is an actor present in all scenes of a Hazardous Area ,ready to play its inherently villainous role.
Let us take a look at Aristotle’s Tragic Plot Structure.
The master has elaborated the chain of events leading to the climax of a tragedy.
There are striking similarities with a Hazardous Area in operation. Notice the change in the direction of the plot initiated by change of fortune . Temperature values within a hazardous area have this potential to change the normal course of events and lead the operation to a tragic end.
Temperature can easily disturb the normal chain of events in any industrial process and sets the stage for a tragedy
So let us cross-check the role of temperature within a Hazardous Area
1. The official definition
Temperature is the measure of the degree of heat present within a body or more technically it is the measure of the average kinetic energy of the molecules of a body.
2. Let us visit a simplified Hazardous Area
The most basic form of a Hazardous Area consists of :
3.Flammable Material (Undergoing process)
Consider this to be our stage and the show is going on in full swing with all actors performing their respective roles.
Remember : This is not a Tragedy
If we look closely we will find our villain well hidden.
Its there !
Inside all the
- electrical equipment like Lighting Fixture , cables ,Terminals , Circuit Breakers etc.
Indicated as the Temperature Class or T-Class
- mechanical equipment. All moving parts , pipe-joints, flanges etc.
- flammable materials
Documented as FLASH-POINT, FIRE-POINT , Auto-Ignition Temperature
- Ambient temperature
Since our play is not meant to be be a Tragedy , then the villain should remain inactive and silent without any action & activity.
To achieve this, we will have to consult & follow the following well written & documented scripts by the EXPERTS of International Electrotechnical Commission .
IEC 60079-10 & IEC 60079-14
According to the script
Keep all respective temperatures compatible with Ignition Temperature of the flammable material.
Flash point is used to classify the volatile material into following main Classes:-
The most notorious & (explosively) active parameter within a Hazardous Area is THE TEMPERATURE.
Its run-away values, during operation of a Gas Plant or any process involving materials which may form explosive mixture with air (and may cause explosion upon ignition ) , leads to catastrophe & tragedy.