Boiler Blog | Nationwide Boiler Inc.

Routine maintenance on your boiler is a critical component for proper and efficient boiler operation. One of the main factors to improper maintenance that can also lead to boiler failure is not understanding the concept of blowdown. In this month’s Boiler Basics 101, we will be going over what blowdown is and how it will help improve your boiler’s health.

When boiler water turns to steam, solids from the water are left behind. The blowdown process involves partially draining the boiler to remove the sludge those solids create. If these are not removed, boiler performance will be reduced and ultimately, it can lead to boiler failure.

Industrial boilers have three types of blowdown procedures:

• Low Water Cutoff
  This blowdown procedure should take place after every shift. The water column must be kept clean to ensure the water level in the gauge glass accurately represents the water level in the boiler. Regular checks on the boiler verifies that the low water cutoff is operating correctly and cleans it out.

• Bottom Blowdown
  Bottom blowdown is done by manually opening a set of two valves that drains water out of the bottom of the boiler. The purpose of the bottom blowdown activity is to clean out solids that accumulate at the bottom of a firetube boiler or in the mud drum of a watertube boiler. Solids are pushed through a blowdown separator designed to take water from the boiler during blowdown and reduce it to atmospheric pressure for disposal. During this process, steam is rapidly separated from blowdown water and vented out the top of the blowdown separator. From there, the cooled blowdown solids can be safely removed from the boiler.

• Continuous Blowdown
  The purpose of the continuous blowdown is to help control the water quality in the boiler; the more impurities and the more chemical treatment required, the greater the amount of blowdown required. It is a procedure facilitated by a pipe entering the upper section of the boiler, typically located in the steam drum of a watertube boiler or the upper steaming portion of a firetube boiler.

The continuous blowdown process is generally automated and does not require much manual interaction, like with bottom blowdown. When operating continuous blowdown, adjust the valve to maintain the recommended boiler water dissolved solids level. This helps control the dissolved solids in boilers that are operated at a steady load.

It is important to consider proper blowdown procedures to keep the water piping clean and the boiler in working condition. 

Be sure to check out our previous Boiler Basics 101 blogs and stay tuned for the next edition!

The rental boiler industry is unique and operates nowhere near the e-commerce business model; you may find it near impossible to find and compare pricing online. With that said, how can a user understand the potential cost of renting a boiler in the preliminary stages of their project, before they are ready to start reaching out and gathering information and pricing from vendors?

To get you started on the journey, these six major costs categories should be considered when looking at renting a boiler.

Ultimately, reaching out to your supplier of choice and obtaining a detailed proposal will be the best way to understand all costs involved with renting a temporary steam plant. Call or email your trusted Nationwide Boiler sales representative for a detailed cost proposal at 800-227-1966 or info@nationwideboiler.com.

Temporary steam will be necessary at some point in the lifetime of a boiler, so boiler owners should be prepared and know what rental boiler options are out there. Let’s review one of the most convenient rental boiler types available on the market today: The Mobile Boiler Room.

Mobile Boiler Rooms come in a wide range of sizes, typically ranging from 50 to 1,000 hp with design pressures of up to 290 psig. They are completely pre-piped and wired and incorporate all necessary auxiliary equipment for a functioning mobile steam plant. This typically includes a feedwater system, duplex water softener, chemical feed system, blowdown separator, and motor control center. Some units are dual-fuel fired, while others are natural gas only to achieve ultra-low NOx emissions compliance. In addition, Nationwide Boiler maintains multiple units that are pre-permitted for use in the SCAQMD to help simplify the air permitting process for our customers.

Mobile Boiler Rooms are often utilized in heavy commercial and industrial applications for added capacity or for supplemental steam. Some of the main advantages to this type of system include:

   - A Mobile Boiler Room is permanently mounted to a highway-legal trailer, so there is no time lost locating a suitable trailer
     for transportation.
   - Being permanently mounted to a trailer also avoids the need for cranes for loading and un-loading, saving both time and money.
   - Mobile Boiler Rooms are completely enclosed and fully weatherproof – no need for temporary enclosures.
   - No expensive and time-consuming foundations are necessary. Only a reasonably level surface is required.
   - All the necessary auxiliary equipment is included, pre-piped and wired. This saves valuable field time and expense.
   - Customers only connect the steam, fuel, water, and electricity drains, everything else is assembled and ready to go.

A Mobile Boiler Room is the closest you can get to a “plug-and-play” rental boiler system. They provide a packaged temporary steam plant that can be up and running in hours if an emergency need arises.  In fact, units have been installed and operational in just eight hours after arrival.

Visit our website to see all rental boilers available from Nationwide Boiler and give us a call today to assist with your next planned or unplanned temporary steam project.

Nationwide Boiler has been on the forefront of innovation in our industry since 1967. Our founder, Dick Bliss, pioneered the mounting of a 20,000 lb/hr package watertube boiler onto a highway-legal trailer signaling the start of an entirely new business on the West Coast.

The rising of truly mobile rental boilers provided time and cost savings for those in need of temporary steam, as well as a reliable, purpose-built option for rent. Prior to this development, temporary steam supply was sourced from steam locomotives or “jury-rigging” obsolete boilers that had been scrapped. None of these early systems were efficient or easy to get to a job site.

Throughout the years we have continually upgraded and enhanced our offerings and have been a leading innovator in our industry. We were the first rental boiler company to convert our entire fleet to low NOx levels of 30 ppm back in 1995, and in 1999 we demonstrated the first SCR system for ultra-low NOx performance on a package boiler. Just two years later, we began offering our CataStak™ SCR system which has now been installed in over 200 applications.

Today, our product offerings include many one-of-a-kind systems, including the world’s largest mobile saturated and superheated steam boilers. Take a look at the list below for a complete overview of the products unique to our company.

40-75,000 lb/hr Trailer-Mounted, High-Pressure Saturated Steam Boilers
110,000 lb/hr Trailer-Mounted Superheated Steam Boiler (World’s Largest)
125,000 lb/hr Trailer-Mounted Saturated Steam Boiler (World’s Largest)
225,000 lb/hr Skid-Mounted, High-Pressure Rental Deaerators
Complete Mobile Feedwater Vans
Urea- and Ammonia-Based CataStak™ SCR Rental Units
DataStak™ Emissions & Efficiency Monitoring System

Nationwide Boiler is a well-established company that provides reliable, purpose-built rental boiler equipment and a great deal more. As a manufacturer’s representative, we supply new and reconditioned fuel-fired boilers, electric boilers, boiler burners and economizers for sale, and we have boiler systems in-stock and available for immediate requirements. In addition, our proven CataStak™ SCR system is available for ultra-low NOx solutions, and we build custom, PLC-based control systems and fuel skids at our UL-certified fabrication facility in Washougal, WA.

Give us a call today to learn how we can support your next boiler related need with, “Integrity, Dependability, and Real Customer Service”. 1-800-227-1966