Explosion-proof equipment is the best option for those who work in Hazardous areas, but do you know how this equipments works? Let's explore this matter in this post.
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When researching for explosion-proof, you might find comparisons with Intrinsically safe equipment. It's a common question about which safety strategy is the best to apply in hazardous areas. For example, climbers have different plans for their climbs: Different paths in which they have the same goal, but depending on the mountain, one will be better. So before you know which path you're going to choose, it's wise to make an assessment.
The EX seal identifies explosion-proof equipment and is a safety strategy adopted for hazardous areas. It is one of the pioneering safety strategies, but its operation still generates curiosity.
What defines equipment as Ex-proof is the enclosure that can resist explosion and prevent damage in your hazardous location. An explosion can create pressure inside an equipment enclosure. This pressure can dissipate more sparkles and cause an even worse accident. To ensure that the equipment is Ex-proof is required to be certified for the proper safety regulations like NEC, NFPA, UL, and others.
This type of equipment is prepared to withstand explosions by gas or steam. So, if the engine generates a spark inside the equipment, its case will be strong enough not to let the explosion dissipate into the external atmosphere. So let's understand how this design works to ensure that level of safety.
When an internal explosion occurs in the equipment, the gas expelled with pressure seeks a way out of the enclosure. Knowing this, the design of the Ex-proof equipment allows the gas to cool before leaving it outside.
Its reinforced housing helps dissipate gas internally by cooling it and preventing pressure from escaping. World safety standards approve this method. However, this measure is not enough if the material used for the casing doesn't have good quality. Minor external damage can jeopardize the product certification and cause accidents. See below for some examples of how the enclosure works.
In conclusion, we will emphasize the importance of working only with quality and certified equipment because it is only in this way that you guarantee the safety of your team and your workplace. To comply with this, always research deeply about the certifications governing your location, be aware of your hazardous area classification and ensure proper periodic maintenance for your Explosion-proof equipment.
Remember the climber? If they choose a longer but safer path, they will make sure to take all possible steps to complete their goal. It may be necessary to ask for help from another climber who has already been there. Similarly, our professionals in hazardous areas can help you choose the ideal material to avoid accidents.
At Intrinsically Safe Store, we offer integrated intrinsic safety solutions to ensure safety and promote your development at work. Consult our catalog of explosion-proof equipment, and if you have any questions, do not hesitate to contact our team of Experts. It's always a pleasure to help you!
In explosive environment applications, Electrical Equipment or machine needs to be employed where fire or explosion hazards may exist. Sources of such hazards include gases, vapours, dust, fibers, and flying's, which are combustible or flammable.
Electrical equipment installed in such locations could provide an ignition source, due to electrical arcing, or high temperature. Hence there is standards and regulations provided to identify such locations, classify the hazards, and design equipment for safe use in such locations.
According to the National Electrical Code (NEC), Ex Proof standard applies to an apparatus enclosed in a case that can withstand a gas or vapor explosion. It means that, should there be an explosion, it will be contained within an enclosure.
The interaction of three elements is needed for creation of a fire. If one element is removed, the fire will extinguish.
Heat ' allow fire to spread by evaporating moisture in the fuels, allowing it to ignite and travel more easily.
Oxygen ' 16% is required. Oxygen supports the oxidation process, creating heat & gases.
Fuel ' gives a fire a burnable material, allowing the fire to advance.
Following are the industries where electrical equipment's work in explosive environment as follows:
1.Oil & Gas Refineries
2.Chemical industry
3.Solar Energy equipment factories
4.Wood working industry
5.Wastewater treatment
6.Paint-spray companies
7.Gas Power Plants
8.Printing
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9.Alcohol Distilleries
Based on the design and certain material selections, Equipment manufacturer design product that does not cause sparks or heat. As such, it does not act as an ignition source in explosive atmospheres.
Typical ATEX and IECEx marking on Ex proof equipment.
All components are labelled on their nameplate with the distinct classification in which they have been tested and approved for installation.
The Ex certification ensures that equipment will work safely in explosive environment without causing any accident and will not act itself as an explosive source if used as per the manufacturer's recommendations.
There are different Ex certifications require for product based on different region installation to prove the quality of products are as follows:
IECEx for the world
ATEX for Europe
CSA US for United States
INMETRO for Brazil
TR CU for Russia
Products manufactured for safe installation in explosive atmospheres and hazardous area zones and categorized according to ATEX as follows:
Zone 0 - An area where ignitable concentrations of flammable gases, vapours or liquids are present continuously or for long periods of time under normal operating conditions. The ANSI/NEC classification method consider this environment a Class I, Division 1 area.
Zone 1 - An area where ignitable concentrations of flammable gases, vapours or liquids are likely to exist under normal operating conditions.
Zone 2 - An area where ignitable concentrations of flammable gases, vapours or liquids are not likely to exist under normal operating conditions. In this area the gas, vapor or liquids would only be present under abnormal conditions.
Zone 20 - ignitable concentrations of dust/fibers/flying's are present for long periods of time.
Zone 21 - ignitable concentrations of dust/fibers/flying's are likely to exist under normal conditions.
Zone 22 - ignitable concentrations of dust/fibers/flying's unlikely to exist under normal conditions.
Class I, Division 1 classified locations - An area where ignitable concentrations of flammable gases, vapours or liquids can exist all the time or some of the time under normal operating conditions. A Class I, Division 1 area encompasses the combination of Zone 0 and Zone 1 areas.
Class I, Division 2, or Zone 2 classified locations - An area where ignitable concentrations of flammable gases, vapours or liquids are not likely to exist under normal operating conditions.
Class II, Division 1 - Ignitable concentrations of combustible dust can exist, under normal conditions.
Class II, Division 2 - Ignitable concentrations of combustible dust are unlikely to exist normally.
Class III, Division 1 - Ignitable fibers, or materials producing combustible flying's, are handled, manufactured, or used.
Class III, Division 2 - Easily ignitable fibers are stored or handled.
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