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NEMA enclosures are used in industrial applications to house and protect variable frequency drives and other electrical equipment. Each enclosure has its own rating to designate the type of application for which that particular enclosure was built for; NEMA 3R and NEMA 4X were built for and are most commonly used for outdoor installations. Having an understanding of each enclosure is important when choosing which one is best for your particular application.

NEMA 3R enclosures are generally used for applications such as rooftop air handling units, irrigation pumps, and water/waste-water pumps. They are made from carbon-steel and equipped with white-powder coated paint and fans for temperature regulation. The fans include filters to keep dust, dirt, and insects from entering the enclosure. NEMA 3R enclosures are versatile in the fact that a viewing window can be installed for internal component viewing, and they can be wall-mounted in environments with potential flooding issues. Installation is rather simple and costs are lower than the alternative, but the enclosures are not protected in corrosive environments.

The alternative, NEMA 4X enclosures, are more expensive due to the addition of an air conditioner in place of the fans. However, there are some significant advantages to using the more costly enclosure. NEMA 4X enclosures are stainless steel creating a corrosive-free enclosure, they are equipped with an air conditioner in lieu of fans for better temperature control, and they are the preferred alternative when NEMA 3R cannot be used. Like NEMA 3R enclosures, they can be wall-mounted and a viewing window can be installed, but installation of the enclosure is more complex. The biggest disadvantage of the NEMA 4X enclosure is its high cost; the larger the enclosure the higher the cost, and operation and maintenance can get pricey as well.

Overall, it is crucial to understand the differences between the enclosures to make an informed decision and save money in the long run. For more detailed information on the features of both NEMA enclosures, check out this article from HPAC Engineering Magazine.

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At Nationwide Boiler we are continually increasing our stock inventory to ensure that we have as much equipment available to customers as possible. The newest addition to our rental fleet is two (2) new 70,000 lb/hr trailer-mounted saturated, package watertube boilers with design pressures of 400 psig. Built by Cleaver-Brooks Nebraska Boiler, these units are completely pre-piped and pre-wired and can be fired with natural gas or no. 2 oil. Both boilers are equipped with low NOx burners and have the option of adding EconoStak economizers for added fuel efficiency. These boilers are available and are ready for immediate shipment worldwide!

Visit our website at www.nationwideboiler.com to see more boilers and equipment available for rental or purchase.

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Companies utilizing steam in their everyday processes should know their correct cost of steam for many reasons, all linking to improvement of the bottom line. This knowledge will allow companies to optimize operations and minimize costs, but many companies are unaware of and don’t account for all factors associated with the cost of steam. Some of these factors include the cost of fuel, steam operating pressure, percentage of makeup water/condensate return, and boiler efficiency. Lower fuel costs and a lower operating pressure will lead to a lower cost, and a higher boiler efficiency will minimize costs as well. Boiler efficiency can be calculated using the ASME boiler performance test code.

There are two methods used to calculate the cost of steam. The true cost of steam is calculated by using the loaded steam cost method. The loaded method provides a more accurate steam cost because it takes into account all aspects and expenses of steam production, rather than just the costs associated with boiler operation (as seen with the unloaded method). The unloaded steam cost method can actually be as low as half the cost found by the loaded cost method. Additional factors included in the loaded method include electrical power, chemicals, water and sewer, emissions payments, labor, management, operations, maintenance, waste disposal, and new projects.

For a more detailed explanation about steam cost calculation, check out the article in Process Heating Magazine.

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Nationwide Boiler Inc. recently facilitated the expedited delivery of a new boiler system in less than six months to a major crude oil refinery in El Paso, Texas. The boiler supplied is a new, in-stock Babcock & Wilcox D type watertube package boiler, model FM120-124, capable of producing 200,000 lb/hr of superheated steam and designed at 750 psig / 750°F superheat. The system includes a low NOx burner, an EconoStak economizer, a Nationwide CataStak™ SCR NOx Reduction System (using 19% aqueous ammonia and vaporizer), SIL Level 2 Burner Management System, desuperheater, stack, and FD fan.

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The plant currently processes approximately 128,000 bpd of crude oil and with this replacement boiler, plant capacity is expected to increase to 150,000 bpd. “As refineries seek to quickly increase capacity and comply with strict emission regulations, Nationwide Boiler is uniquely qualified to provide in-stock boiler solutions that incorporate the highest standards in safety, efficiency and emission reducing capabilities," said Larry Day, Nationwide Boiler Vice President, Sales & Marketing. “Our long-lasting relationship with Babcock & Wilcox and other OEM suppliers has enabled Nationwide Boiler to provide the highest quality boiler systems to customers located throughout the world. This project is another example of how we can meet the needs of those customers seeking immediate boiler solutions.”

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