Flameproof equipment manufacturer in india

Coal mining, Oil, Petroleum and Fertilizer industries form the core sector of a country’s economy. Unfortunately, these are

also the industries where explosive gases are frequently encountered. Methane is emitted while coal is being extracted

from a mine and the mixture of methane with air is explosive and has caused large number of explosions killing thousands

of persons in underground mines. Similarly, during the drilling of oil and its subsequent refining, gases are encountered

which form explosive mixture with air. Leaving coal, oil and fertilizer, there are large number of other industries where

during the process of production, refining and storage, explosive gases are encountered. As for example, explosive gases

are present in a Dalda vanaspati factory or a cooking gas bottling plant. The history of industrialization is full of instances

where explosions have occurred in mines, petroleum installations and factories killing thousands of persons.

In an explosive environment, which is encountered in coalmines, petroleum installations and other areas, the use of

electricity is fraught with grave consequences. It is a common knowledge that whenever an electrical circuit is made or

broken, there may be spark and this spark may be sufficient to cause explosion in an explosive environment. The spark,

during switching of a lamp in a house has, perhaps, been observed by almost everybody. But, such type of sparking

cannot be allowed in explosive atmosphere frequently encountered in the industries mentioned above. Therefore, in such

explosive environment, special type of electrical enclosures, which are commonly known as flameproof, or explosion proof

enclosures are employed. The term flameproof and explosion-proof enclosures are synonymous and have been defined

subsequently. But it would be sufficient to mention here that these are the enclosures, which do not permit a spark or

explosion occurring inside the enclosure to be transmitted to outside environment and cause explosion thereby.

The special requirements of electrical apparatus for use in explosive environment have been discussed in a number of

Indian Standards. The details regarding these standards have been given in Appendix I.

1.2 Important terms and their definitions:

The technical terms used frequently in the book have been defined in the following paragraphs:

Explosion: Sudden increase of pressure and temperature due to oxidation or other exothermic reaction.

Explosive Atmosphere: Mixture with air, under atmospheric conditions, of flammable substances in the form of gas, vapor,

mist dust or fibers in which after ignition, combustion spreads throughout the mixture.

Explosive gas Atmosphere: A mixture of flammable gas or vapour with air, under atmospheric conditions, of flammable

substances in the form of gas, vapour, mist in which after ignition combustion spreads throughout the mixture not yet

consumed.

Ignition Temperature: The lowest temperature at which an explosive mixture ignites when tested according to the IEC

standardized method.

Explosive Dust Atmosphere: Mixture with air, under atmospheric conditions, of flammable substances in the form of dust

or fibers in which after ignition, and subsequent combustion, combustion spreads through the mixture.

The Most Ignitable Mixture: Mixture requiring the lowest electrical energy for its ignition under specified conditions.

Most Transmittable Mixture: Mixture the flame of which most easily transmits an ignition through a joint under specified

conditions. This is also called ‘Most Incentive mixture’.

Flammable Liquid : Liquid the vapour of which will burn in air.

Flash Point: Lowest temperature of a liquid of which under specified conditions, the tested liquid gives off enough vapour

to form an explosive gas atmosphere above the surface of the liquid.

Enclosure: All the walls (including doors, covers, cable entries, rods, spindles and shafts), which surround the internal

electrical components and circuits of an electrical apparatus.

Hermetically Sealed Enclosure: Enclosure completely closed against the ingress of gas, dusts, solid objects and liquids, by

fusing of metal to metal, glass to metal, etc.

Flameproof Enclosure: An enclosure for electrical apparatus, which can withstand without suffering damage the pressure

developed during an internal explosion of an explosive mixture and which prevents the transmission of the explosion to

the explosive atmosphere surrounding the enclosure. Trimurti Tri-flp is the most effecient and cost effective manufacturer of flameproof equipments or explosion proof products.