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Nationwide Boiler is pleased to be attending the 11th Annual Shutdowns Superconference in Houston June 25-26th, organized by the Canadian Institute Energy Group. This event delivers the most practical turnaround solutions from local and international experts who will provide you with the latest techniques and tools on how to manage a large or small scale turnaround across a variety of industries.

Speakers representing the most recognized oil and gas companies in the world will be on hand to discuss innovative ways to take your shutdown, turnaround or outage to the next level. Nationwide Boiler will also be in attendance to ensure that all your boiler needs are taken care of, in addition to answer any questions you may have regarding the CataStak™ SCR system for trusted 5 ppm NOx compliance.

We hope to see you in Houston next week!

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The latest issue of Power Engineering Magazine includes a feature article highlighting Nationwide Boilers first ever Ammonia-Free CataStak SCR installation for two 55,000 lb/hr watertube boilers. The system easily reduced NOx emissions to comply with local air regulations. To see the publication and learn more about this project, click here!

NOx Limits Met with Ammonia-Free SCR Solution from Nationwide Boiler Inc.

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Boilers come in all different types, sizes, and shapes and are classified by configuration of the furnace, or firesides, and the watertubes, or water holding volume. The two main boiler types consist of firetube and watertube boilers, and deciding which of the two will best fit your process needs is not as easy as it may seem. It is like comparing apples to oranges; it’s not as simple as just comparing prices for similar nameplate steam capacity, and there are some significant differences to consider.

With firetube boilers, flue gases are directed through vertical or horizontal steel tubes that are surrounded by the water for heating, and typically go through two, three, or four passes, or changes in direction. In watertube boilers, the arrangement is reversed. Instead of the water being outside the tubes, it circulates inside the tubes and is heated externally by the combustion gases. Fuel is burned inside the furnace, which heats the water in the steam-generating tubes. The water then rises to the steam drum where saturated steam is drawn from the top of the drum. The watertube boiler has some relative advantages over the firetube boiler design, which are outlined below.

Watertube boilers are safer by design and generally considered to last much longer than the firetube boiler. They are available in much larger sizes and recover faster than firetube boilers, can handle pressures up to 5000 psig, and have the ability to reach very high temperatures with the use of superheaters. Because of their inherent design, firetube boilers are not suitable for pressures above 350 psig. Also, the steam output is less than the nameplate at actual operating conditions. Watertube boilers are rated at actual operating conditions. However, from a manufacturing standpoint, firetube boilers are typically lower in cost than a comparable sized watertube boiler, the firesides are easier to clean, and the straight firetubes are easily replaceable.

Let’s not forget that there is a tremendous difference in water volume between a firetube boiler and a watertube boiler. From a cold start, the firetube boiler, due to its larger water volume, takes longer to bring up to operating temperature or pressure vs. a similar sized watertube boiler. With less water volume, a watertube boiler can follow load swings more precisely and generally has better turndown. However, one advantage that the firetube boiler does offer is that once it is up to operating pressure, it can handle a sudden upward load surge better because of the large steam disengaging area. The drawback to this feature is once you drop pressure on the firetube, it takes longer to catch back up.

The rule of thumb is that if you have a very constant and steady load that doesn’t vary much, than the firetube boiler may work well. If you have a swing or varying load, then the watertube boiler is generally a better choice.

Click here to view Nationwide Boiler's current inventory of firetube and watertube boilers available for shipment anywhere in the world!

 

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The 29th Annual International Fuel Ethanol Workshop and Expo is planned for June 10-13th in St. Louis, MO and Nationwide Boiler will be there exhibiting at booth #433. Be a part of the largest gathering of ethanol professionals in the world including the best ethanol industry products and service suppliers. Plus there will be four tracks focused on in-depth topics that include production and operations, leadership and financial management, co-products and product diversification, and cellulosic and advanced ethanol.

Take part in the leading ethanol tradeshow event of the year and be sure to stop by the Nationwide Boiler booth to pick up a free USB literature drive that includes a library of bulletins, brochures, and case histories from Nationwide Boiler. Visit the FEW website for more details about the event. 

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