HAZ AREA What Is A Hazardous Area?

Status
Not open for further replies.

ver

Administrator
Staff member
A hazardous area is defined as an area where an explosive atmosphere is present or may be expected to be present in quantities which require special precautions for the construction, installation, and use of potential ignition sources.

The explosive atmosphere may be caused by the presence of a flammable liquid, gas or vapour or by the presence of combustible dust in suspension or in layers or a combination of explosive gas and dust atmospheres.

During design, every effort is made to minimize the extent of hazardous areas however it will be difficult to ensure that an explosive atmosphere will never occur.
Incorrect design may result in the occurrence of sparks which could ignite other flammable materials that lead to extensive damage to the whole plant, adverse effects to the environment and serious injuries to personnel.

Where there is a high risk of an explosive atmosphere occurring, apparatus with an extremely low risk of creating an ignition source must be used. Conversely where there is a lower risk of an explosive atmosphere occurring, apparatus with a higher ignition risk may be used.
 

ver

Administrator
Staff member
I. INTRODUCTION
There is a danger of an explosion or fire occurring wherever flammable or combustible materials are handled. In England in the last century, hundreds of lives were lost every year in coal mining explosions.

Today, the hazards still exist, not only in the coal mining industry but in many other industries as well. Major industries include the petrochemical, pharmaceutical, chemical, sewage treatment, and grain handling industries. In 1988 the Piper Alpha oil and gas platform in the North Sea caught fire and exploded killing 167 workers. In many cases the hazards occur in areas frequented by the public. An example petrol (gas) service stations.

The common denominator in all these situations is the use of electricity.
If an electrical apparatus is used in an environment where an occurrence of an explosion is a possibility, it is essential that measures are taken to eliminate the likelihood of explosive atmospheres occurring around any source of ignition or limiting the possibility of an ignition source, (e.g. arcs, sparks or hot surfaces) occurring.

To prevent any of the electrical apparatus becoming a source of ignition for an explosion, special precautions has to be taken during design, construction, selection, installation and maintenance of such apparatus.

The numerous incidents caused by these hazards, many governments around the world have established regulating bodies and appropriate Standards and codes of practice. Strictly compliance to these codes of practice and appropriate Standards is a must otherwise tasks performed incorrectly could cause death, injury and property destruction.
 
Status
Not open for further replies.
Top