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Nationwide Boiler news and events, industry updates, technical resources and more. You hear it first on The Nationwide Boiler Blog!

Boiler Basics 101: Blowdown

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.

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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!

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The Cost of Renting a Boiler

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.

Equipment. Your process, as well as the steam capacity requirement, will often dictate which type of boiler is best fit for your operation. A watertube boiler, often best for larger capacity needs, will run at a higher cost than a firetube. If additional equipment is required like a deaerating boiler feedwater system, water softener, or SCR system for reduced emissions, additional costs will be realized.

You can save on costs if you are able to connect to existing auxiliaries, however, that is not always an option. A mobile boiler room, which includes a firetube boiler installed with a feedwater system, water softener, and blowdown separator, is a convenient option for customers needing an entire steam plant. Because it is a complete, pre-piped and wired system, the cost would be higher than that of a boiler-only option.

Freight. Often coordinated and re-billed by the rental boiler supplier, this will be a separate cost billed after each time the equipment moves (from the storage facility to your site, and then back to the storage facility). Costs will vary based on number of shipments required and how far the boiler must travel. Some companies, like Nationwide Boiler, have multiple maintenance yards to help facilitate quick and lower-cost shipments.
 
Installation. This is a piece of the process that is typically coordinated by the end-user and with a third-party supplier. Installation costs can vary greatly depending on the size of a project. The cost to install a mobile boiler room for a temporary project, as close as you can get to a “plug and play” system, would likely be much lower than the cost to install a large watertube boiler. Watertube boilers are more commonly installed in industrial applications along with economizers, SCR systems, and ductwork – heavy equipment that requires forklifts and/or cranes for installation.
 
Start-up. Most often, your rental boiler vendor will supply a technician for start-up with costs billed on a time and material basis. It’s important to ensure that the equipment is completely ready for start-up with all utilities piped and available, to reduce extra time costs. You will also want to consider any time required for site-specific safety training.
 
Utilities. Obviously, the utilities are the responsibility of the end-user, however, it is an expense that should not be overlooked. You will incur costs associated with the fuel, water, and electricity required to produce steam. Rental economizers and blowdown heat recovery systems can be utilized to help reduce these costs.
 
Water Treatment. This is an extremely important part of maintaining a rental boiler, and if not done properly can lead to extreme costs for equipment repairs. The cost of contracting with a water treatment supplier will be much less than what it would be to replace or repair damaged rental boiler equipment.
 

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.

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Preventing Freeze Damage This Winter

It's that time of year again for our annual freeze protection reminders. As you know, winter can bring extremely cold weather conditions, especially in Canada, the Northeast, Midwest, and Upper Midwest. To reiterate what we have been saying for years, here are a few things to consider to protect your rental boiler and auxiliary equipment (deaerators, water softeners, etc.) from damage due to freezing temperatures this winter.

1. If you are renting a trailer or skid-mounted firetube or watertube boiler and installing the unit outdoors, these systems are completely exposed to the environment. User's should consider enclosing the front and/or the rear end of the boiler, or build a temporary enclosure around the entire system. An external heating source should also be used. 

2. Install the proper heat tracing (steam or electric) and insulation on all main lines and piping components, regardless of whether the boiler (or auxiliary equipment) is in operation or sitting as stand-by. This should include the following lines: 
      - Sensing lines for all transmitters
      - Primary and auxiliary low-water cut-offs
      - Water column and connected piping
      - Bottom blowdown and surface blow-off piping, depending on the length of the piping runs. These valves should also be left open. 

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Reduce, Reuse, Recycle – Rental Boiler Edition

At Nationwide Boiler, we maintain a purpose-built fleet of over 100 rental boiler systems from as small as 47.5 hp to as large as 200,000 lb/hr. We have multiple configurations including mobile, trailer-mounted boilers, complete mobile boiler rooms and mobile steam plants, skid-mounted firetube and watertube boilers, factory-integrated skid packages, and even electric boiler systems. With a rental fleet as versatile as ours, we can always find a solution when a customer comes calling.

It is not uncommon for a rental boiler to return and need repairs. A unit might need parts to be replaced, an acid cleaning or even a complete retube, but the worst-case scenario would be the need to scrap a boiler entirely due to damage beyond repair. But if a boiler is properly maintained, as we have said before, it can last a lifetime. A boiler retube can transform a system and bring it back to like-new condition. And, with so many different types of boilers in our rental fleet, we have found other ways to transform, reuse, and recycle when our equipment still has years of life left. 

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