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Boiler water treatment chemical feed systems by Madden Manufacturing

by Madden Manufacturing • March 09, 2018
Madden Manufacturing Boiler water treatment chemical feed system, stainless steel Boiler water treatment pumping skid

In many of our other articles, we have already discussed the importance of keeping your boiler water clean of sediments, dissolved solids, scale build up, etc. In those articles, we’ve focused on boiler blowdown, both intermittent bottom blowdown, and continuous surface blowdown.
Terms to know:
Intermittent blowdown: when a boiler operator flushes about 4” of water from the bottom of the boiler. This is usually done once or twice a day, for 30 seconds to a minute. Every boiler needs to be intermittently blown down.

Continuous surface blowdown: some higher capacity boilers blowdown continuously. Surface blowdown rids the boiler of the water that holds the dissolved solids and sediment that floats on the surface level.

Ridding your boiler of dirty water ensures efficient boiling. Allowing the boiler to build sediments, solids, and scale, decreases the heat transfer between either the fire tubes or water tube (depending on your boiler type), thus decreasing boiling efficiency. To read more on the importance of blowdown operations and equipment for such operations, check out some of our other articles here (Recent: Heat Recovery from boiler blowdown part 1, part 2, and much more on our blog page)
Today though, rather than focusing on ridding your boiler of dirty water, we want to talk about what Madden can help provide to keep the water from getting dirty too quickly in the first place.
And that is chemical feed systems to treat boiler water.

Common boiler water treatment chemicals and why they’re used

Most boiler systems (systems usually being/referring to the boiler(s) itself and the D/A tank) can be well serviced with an oxygen scavenger and a phosphate.

Oxygen scavenger and phosphates are among the most common boiler treatment chemicals. Oxygen scavenger’s main purpose is to reduce corrosion that results from oxygen in the water. Eliminating corrosion means your piping and tubing should last a very long time. Phosphates are used to soften the water. Neutralizing the hardness of water by reacting with the alkalinity of the boiler water to form compounds that can then be removed from the system by intermittent or continuous blowdown.

When choosing your chemicals for boiler water treatment, your main concerns lie with anti-scaling and anti-corrosion. You want your pipes/tubes to transfer heat as efficiently as possible, and last for as long as possible. Corrosion and scaling are the two biggest enemies to this process.

There are several other common chemicals used in boiler water treatment such as Amine and anti-foam,  which serve the same overall purpose of keeping your boiler feed water clean from impurities that hinder the boiling processes, and these can be used as compliments along with oxygen scavenger and phosphates to further boiler water treatment.

Lenntech has a great article on “Boiler Water Treatment” you can read for more information here.
For now, let’s go on to what Madden Manufacturing can offer for this boiler water chemical treatment process, and that is the hardware needed to mix, store, and inject chemicals into your boiler room system components.

Boiler water treatment equipmentSmall boiler chemical feed system

Most of our standard boiler treatment chemical feed system skids contain the following:
  • (2) 55-100 gallon HDPE tanks for storing Oxygen Scavenger and Phosphate
  • (2) AA102 high speed mixers for mixing the calculated concentration of chemical needed.
  • (2) Small Madden chemical metering pumps, usually around 5 GPH design
  • (1) Control panel for easy on/off type operation of the pumps and mixers
  • Piping that includes y strainers, relief valves with piping back to tanks, and any other accessories that may be appropriate per application.
  • A steel skid, to install the system on to as compact of a design as possible.Now, let’s break down each component to give a better description of what they do and what other options are available.
Tanks: the standard tanks used in Madden chemical feed systems are self-draining, cone bottom high density polyethylene tanks. Usually the sizes range from 30 to 120 gallon depending on the application. We also have a local tank manufacturing company that can provide us with any custom steel or stainless steel tank we need.
We’ve made systems with stainless tanks as large as 300 gallons (include new CB picture).
On these tanks we often provide:
  • Level gauges
  • Low level switches wired to control panel
  • Multiple inlet connections for condensate return, among other sources that are fed into the tank
  • As many connections that are needed per the application
Mixers: our standard mixer is our AA102 high speed mixer. These simple, cost effective units simply use a 316 SS shaft directly coupled to an electric motor, with a 3 blade marine type propeller(s) fastened to the end. They are great for agitating soluble chemicals.

We also offer similar medium and slow speed mixers. You can read up on our mixers on the web page for our Industrial Mixers.

Chemical metering pumps: Madden Manufacturing has diaphragm metering pumps that are great for injecting chemicals into a process. Our pumps boast one of the most rugged and durable designs on the market. They are simple and straight forward, a workhorse designed for 24/7/365 type applications.
The Madden chemical metering pump line ranges from pumps designed as low as 1 GPH all the way up to pumps designed with capacities of 360 GPH. Madden pumps can reach pressures up to 300 PSI. For high pressures we can outsource a different style of pump (like a plunger pump) complete some boiler water treatment skids.

Control Panel: Madden Manufacturing makes our control panels in house. We offer steel and stainless steel enclosures. Madden Manufacturing can provide designs and drawings for chemical feeds systems that call for start/stop buttons, pilot lights for indication of certain operations, low level switch wiring, among many other component wiring that may be needed per application.

When a customer needs complete automation, we have trusted companies we partner with to offer more advanced control panels that work in conjuncture with PLC and other automated type systems.

All in all, when it comes to boiler chemical feed systems, Madden has you covered.


Madden Manufacturing has over 65 years’ worth of experience building chemical metering pumps for all types of chemical injection application. Our company also has 65 years’ worth of experience designing boiler blowdown tanks and boiler blowdown heat recovery systems.

During this time, we’ve also built many boiler chemical feed systems. Our knowledge of this process both stems directly from being involved with boiler water treatment and feed systems, as well as stems from related fields surrounding these applications.

We have a wealth of knowledge, and outstanding reps/distributors and other contacts to help you out when we do come across questions or ideas that need more attention.

If you have a new boiler room or addition to a boiler room coming up, consider giving us, or one of our certified reps a call to discuss the Madden boiler water chemical treatment system skids. We’d be happy to assist in any way we can.

Thank you for reading our article, and have a great day!
(Phone: 800-369-6233  |  Email:


Faster Lead Times than Neptune & Milton Roy

Madden Manufacturing is currently quoting lead times of:
  • Chemical Metering Pumps @ 1-2 weeks
  • Fully Assembled Chemical Feed Systems @ 3-6 weeks
  • Sample Coolers & Small Heat Exchangers @ < 1 week
  • Emergency/Rush pumps in 1-2 days!


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