Intrinsic Safety (IS): An Intrinsically safe design means that the circuit (electronics or wiring contained within the equipment) cannot have capability to produce enough energy which can generate spark OR a design of a electronic apparatus which cannot accumulate enough energy to ignite the gas or vapor at the location which has been classified as hazardous area. IS design also advocates that the surface temperature of the any equipment located in hazardous area cannot get high enough to ignite the gas or vapor at the respective location.
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Explosion Proof: Electrical equipment/apparatus is housed or has an enclosure which prevents an internal spark/ignition from causing a much larger explosion. Apparatus with an explosion proof classification doesn't mean the it will survive an explosion. Design of enclosure is such that it can contain any flash / spark / ignition or explosion. The housing on this type of apparatus is usually made of stainless steel or cast aluminum and strong enough to bear an explosion into the enclosure and the internal electronics ignite. Also enclosure design is such that if there is an internal explosion, the external surface temperature of enclosure does not meet or exceed the ignition temperature of the gases in the group the equipment has been rated for (hazardous area classification).
Design criteria of Intrinsic Safe (IS) Apparatus: Usually the main factors which drives Intrinsic safe design is "Output Voltage (V DC)", "Output Current (mA)" and "Output Power (W)". As per hazardous area classification following are limitations:
Understanding Hazardous Area Classification:The National Electrical Code (NEC) also is a classification tool for hazardous conditions. Many of the products in Oil & Gas/Petrochemical Industries are typically associated with a hazardous area classification. For example, some of the filed instruments /electronic apparatus are Class I Division 1 and 2, and Class II Division 1 and 2.
There are 3 types of hazardous conditions OR classes:
Further there is 2 types of hazardous conditions within a class. Class-I pertaining to gases and vapor hazards, the two kinds are:
In Class-I there are four Groups (A, B, C, D): which are classifications of atmospheres by the degree of volatility with 'A' being the most hazardous and 'D' being the least volatile group.
Intrinsic Safe design based on above hazardous area classifications:Based on hazardous area classifications (as stated above) there is 2 types of classifications for intrinsic safe (IS) apparatus i.e. Ex ia apparatus is designed to be safe with 2 independent faults and can be used in Zone 0 while Ex ib has a lower level of integrity and cannot be used for Zone 0, the same will usually contains fewer zener diodes as a part of circuit design and suitable for used in Zones 1 or 2.
Why end-users preferred choice if Intrinsic Safe (IS) design specially in hazardous classified environment?
The main challenge for end-users is to have live maintenance capabilities in hazardous area without isolating the power source of respective device/ instrument/apparatus for reliable and safe operation. To achieve this goal Intrinsic Safe (IS) design is the only alternative which can serve the purpose effectively. Because of the same reason and global acceptance by end-users in last one decade specially in Oil & Gas / Petrochemical Industries lot of development happens focusing on IS design concept, Foundation Fieldbus FISCO design is one of the live example these days followed by many Industries/leading end-users in the globe.
Because they are modular in nature, the construction of blast-resistant buildings happens before they ever get to your site. This is one of the greatest benefits of modular construction.
In short, this means there's much less of an impact on your site operations. There's no period of downtime for the space the building will occupy. There's no working around the mess of a construction site. There's no re-routing of trucks.
During the construction phase, the customer will get updates as needed, including progress photos. There's no way to nail down how long the construction of a blast-resistant building will take because each project is different. It's all dependent on the construction queue of the vendor, the size of the building, and the complexity of design and elements.
A typical build, for example, a simple three-plex or smaller, may take 16-20 weeks from the time drawings are approved. Other complex projects will take more time. Your vendor should be able to talk in more detail about this, based on the specs of your individual project. There are occasionally ways to expedite builds, but it's not a good practice to rely on that to happen.
The last thing to happen while the building is still at the vendor site is the factory acceptance test. The building is put together at the facility, just like it would be on the customer's site. Some customers may choose to do a final onsite walk-through; others may give approval based on photos of the finalized building. This can typically be done in a day.
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Once the final walk-through has happened, there will be no time wasted before the build is on the road. If the building is a multi-plex, it could take several trucks to get it to its final destination.
Some companies have their own transportation fleet, while others rely on outside sources. And some will use a combination of their own trucks and third-party transportation sources.
According to the project managers at RedGuard, working through the design process without delays is the biggest challenge in managing blast-resistant building projects.
Designing a building requires a lot of information and input from the customer. Sometimes there is information that is not available during the bid phase.
Examples of some information that may not be available before the PO is issued are things like the actual electrical load requirements for equipment that is supplied by the customer, the expected use for each room in the building, and final details like color or finish selections. Waiting on these things can slow down the initial design process.
Another hold-up is that sometimes the person who's been involved on the customer side, the purchasing agent, isn't the end-user of the blast-resistant building. Once the end-users become involved, they may have valuable information or knowledge of the project that will require changes during the initial review. For this reason, it's helpful when decision-makers and the building's users are both involved during the bid process, so all details are resolved prior to project award.
Change orders are a fact of life in the management of blast-resistant building projects, so it's not the worst-case scenario when they come up, but avoiding them will always save you time and money. Following the advice here, as well as keeping the lines of communication open, and the team informed, will serve you well.
At RedGuard, we design and build blast-resistant buildings and have been doing it since . All the related details are on our minds every day, for at least 40 hours a week, but we know that our customers have more to think about. That's why our team of experts, in Sales, Estimating, Engineering, and Project Management, are ready and willing to answer your questions and consult on your project.
No matter how much experience you have with capital projects or turnarounds, let's start talking about your goals and see if it makes sense to put a RedGuard blast-resistant modular building on your worksite.
No two hazardous worksites are alike, so no two blast-resistant projects are alike. Our expert team can help you start planning your project to save you time, money, and, most importantly, lives
With this in mind, it is important to note that blast-tested buildings are usually given specific psi ratings. Knowing what rating your facility needs, will depend on many factors, such as the type of structure, the likelihood that it will experience a blast event, and its proximity to different assets, equipment, and materials. For example, a laboratory BRB that is near a blowdown stack might need an 8 psi rating, while a structure that is located closer to the perimeter of your facility might only need a 4 or 5 psi rating. (These are hypothetical and don't represent actual recommendations.)
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