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Browse the store →DOE best practices for maintaining steam system efficiency—and why chemical-free scale prevention delivers up to 5% fuel savings.
Steam is an indispensable means of delivering energy in the manufacturing sector. In 2006, U.S. manufacturers used about 4,762 trillion Btu of steam energy, representing approximately 40% of the total energy used in industrial process applications [1].
of industrial energy
used for steam [1]
Fuel increase from
scale in firetube boilers [2]
Annual fuel loss
1/32" scale, 450K Btu boiler [3]
Energy savings from
blowdown control [4]
While there are many different ways to improve steam system energy consumption, energy performance in steam systems is most effectively optimized when a systems approach that analyzes both the supply and demand sides of the system and how they interact, is used [1]. The prevention of scale formation in boilers can result in substantial energy savings [2].
Scale deposits occur when calcium, magnesium, and silica, commonly found in most water supplies, react to form a continuous layer of material on the waterside of the boiler heat exchange tubes [2]. Any scale in a boiler is undesirable [2].
The U.S. Department of Energy's Advanced Manufacturing Office has published comprehensive guidelines for steam system efficiency. Key recommendations include [1][2]:
Inspect and repair steam traps
Insulate steam distribution and condensate return lines
Install condensing economizers
Use feedwater economizers for waste heat recovery
Minimize boiler blowdown
Recover heat from boiler blowdown
Improve boiler combustion efficiency
Prevent scale formation (focus of this guide)
"Scale creates a problem because it typically possesses a thermal conductivity an order of magnitude less than the corresponding value for bare steel. Even thin layers of scale serve as an effective insulator and retard heat transfer. The result is overheating of boiler tube metal, tube failures, and loss of energy efficiency."
Scale deposits occur when calcium, magnesium, and silica, commonly found in most water supplies, react to form a continuous layer of material on the waterside of the boiler heat exchange tubes [2].
As water evaporates in the boiler, the minerals in the water don't turn into steam; they are left behind to form scale inside the equipment [3]. On some equipment, the scale buildup can be inches thick [3].
Scale typically possesses a thermal conductivity an order of magnitude less than bare steel [2]. Even thin layers of scale serve as an effective insulator and retard heat transfer [2].
The boiler then has to burn more fuel to transfer heat through the insulating scale layer [3].
Scale Thickness | Energy Loss (Firetube Boiler) [2] | Annual Fuel Cost Impact (450,000 Btu boiler) [3] |
|---|---|---|
1/32 inch (0.8 mm) | 2% fuel loss | $72,000 |
1/16 inch (1.6 mm) | 3% fuel loss | $108,000 |
1/8 inch (3.2 mm) | 5% fuel loss | $180,000 |
*Based on 8,000 hour runtime and $3.00/MMBtu fuel cost. Your savings will vary with fuel prices and operating hours.
The DOE recommends three primary methods to prevent scale formation [2]:
Method 1: Pretreatment
Pretreating boiler makeup water using water softeners, demineralizers, and reverse osmosis to remove scale-forming minerals [2].
Removes minerals but requires ongoing media replacement, regeneration chemicals, and produces waste discharge.
Method 2: Chemical Injection
Injecting chemicals into the boiler feedwater [2].
Requires continuous chemical purchases, monitoring, and feed systems. Chemicals manage scale but don't eliminate root cause.
Method 3: Blowdown
Adopting proper boiler blowdown practices [2].
Removes concentrated solids but wastes water and energy. Automatic blowdown can reduce energy use by 2-5% [4].
The Vulcan Alternative: Chemical-Free Scale Prevention
Unlike the DOE's three traditional methods—all of which require ongoing inputs, maintenance, or energy—Vulcan's physical impulse technology prevents scale formation at the molecular level with zero consumables.
No softeners - No salt, no regeneration, no brine discharge
No chemicals - No oxygen scavengers, scale inhibitors, or condensate treatments
No blowdown increase - Maintain higher cycles of concentration naturally
Zero ongoing costs - Install once, protect forever
The DOE acknowledges:
"The best way to deal with scale is not to let it form in the first place." [2]
FEATURED CASE STUDY
Facility: FAMU/FSU College of Engineering
Location: Florida, United States
Application: Twin cooling towers (CT-1 and CT-2) on 10-inch diameter line
The maintenance for these cooling towers previously involved continuous injection of descaling chemical cleansers. The use of these cleansers was discontinued over a year prior to the installation of the Vulcan. In that time, the cooling tower flutes became encrusted with both scale and biofilm. Throughout the observation period, there were no cleaning procedures in place besides the treatment provided by the Vulcan [5].
July 16: Vulcan S250 installed
August 1: Green biofilm began receding
August 9: Biofilm further reduced, scale separating in coin-sized flakes
August 20: Biofilm almost completely disappeared; scale coverage reduced by over 60%
The Vulcan does not change water quality beyond its effect on its propensity to cause scale buildup [5].
pH, conductivity, dissolved oxygen, and turbidity remained constant.
During electrophoresis, a small amount of H₂O₂ is liberated, which passivates metal surfaces [5].
This passivation reduces rust and corrosion inside pipes and on surfaces.
FEATURED CASE STUDY
Facility: Food Processing Plant (Delicatessen)
Location: Indonesia
Application: Boilers, heat exchanger, sterilizers
The food processing facility was experiencing severe scaling issues across multiple systems. They sought to replace traditional water softeners with a chemical-free solution that would make old scale manageable and prevent future deposits [6].
1 x Vulcan 3000 for the boilers
1 x Vulcan 3000 for the heat exchanger
1 x Vulcan 5000 for 2 sterilizers system
🔥 Boiler:
A non-stop running boiler, covered in 0.5mm scale, cleared within 2 months of using Vulcan [6].
💧 Pipes and Sterilizers:
15 years of scale buildup disappeared within 3 months of Vulcan use [6].
"Using electrocoagulation, it transforms the molecular structure of water particles, making scale easy to clean and preventing future deposits."
Gradiant CURE Chemicals Case Study [7]
Facility: Large industrial manufacturer in Gulf region
Boilers: Two low-pressure firetube boilers
Challenge: Softener system outages causing hardness fluctuations, increased scaling risk
Bespoke CURE Chemical blend combining oxygen scavenger, scale inhibitor, and condensate treatment
Twice-weekly monitoring and service reports
Ongoing chemical purchases and maintenance
>3 years without unplanned maintenance
Zero unplanned downtime
Up to 5% fuel efficiency improvement
The Critical Distinction
✓ Gradiant achieved excellent results—but at what ongoing cost?
Factor | Chemical Treatment | Vulcan |
|---|---|---|
Chemical purchases | Ongoing | Zero |
Monitoring frequency | Twice weekly | None required |
Service reports | Ongoing | None required |
Softener dependency | Required | Eliminated |
Chemical handling risk | Yes | No |
Both approaches can prevent scale. Only Vulcan does so with zero ongoing costs, zero labor, and zero chemical risk.
Blowdown is necessary to remove concentrated solids from the boiler, but excessive blowdown wastes water and energy [4].
Install automated chemical feed systems to monitor conductivity, control blowdown, and add chemicals based on make-up water flow
These systems minimize water and chemical use while protecting against scale buildup and corrosion
Switching to automatic control can reduce boiler energy use by 2 to 5% and reduce blowdown by as much as 20%
By preventing scale formation, Vulcan allows boilers to operate at higher cycles of concentration naturally—reducing blowdown frequency and volume without chemical additives.
Less blowdown = less water waste
Less blowdown = less energy loss
No chemical feed system required
Plate heat exchangers are another common piece of equipment that can suffer from scaling [3].
A study looked at scale buildup on heat exchanger plates operating for one week with untreated tap water. After just one week, the plates were literally covered in hard scale. Imagine the level of scale after two weeks or even one month. It would not take long for the scale to totally stop the flow of water and ruin the equipment.
Loss of heat transfer efficiency
Increased pressure drop requiring more pump energy
Premature equipment failure
Higher utility bills and more frequent pump repairs [3]
Armstrong Limited suggests: "Cleaning of fouled plate heat exchanger by back flushing will remove most of the soft debris... The solution used for back flushing shall be weak acids with concentration less than 5%; one example is citric acid." [3]
Vulcan eliminates the need for acid cleaning entirely.
Inspect and repair steam traps
Insulate steam distribution and condensate return lines
Install a condensing economizer
Use feedwater economizers for waste heat recovery
Minimize boiler blowdown
Recover heat from boiler blowdown
Replace pressure-reducing valves with backpressure turbogenerators
Use low-grade waste steam to power absorption chillers
Upgrade boilers with energy-efficient burners
Improve boiler's combustion efficiency
Every one of the DOE's ten measures assumes the boiler is operating without scale. Scale undermines every efficiency improvement—making scale prevention the foundation of all other efforts.
Annual Savings - 450,000 Btu/hr Boiler (8,000 hrs/year)
Baseline fuel consumption: 450,000 Btu/hr × 8,000 hrs = 3,600 MMBtu/year | |
Fuel cost: $3.00/MMBtu | |
Annual fuel cost baseline | $10,800,000 |
1/32" scale (2% fuel loss) [2][3] | $216,000 lost |
1/16" scale (3% fuel loss) [2] | $324,000 lost |
1/8" scale (5% fuel loss) [2] | $540,000 lost |
Vulcan eliminates this loss permanently | $216K - $540K saved |
Typical chemical treatment programs for a boiler this size cost $15,000-$30,000 annually—and they don't eliminate scale, they merely manage it. Vulcan eliminates both the fuel loss AND the chemical costs.
For precise pricing tailored to your boiler specifications:
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SMALL BOILER
Up to 100 BoHP
Package boilers
Small industrial processes
Heat exchangers
MEDIUM BOILER
100-500 BoHP
Firetube boilers
Watertube boilers
Multiple boiler plants
LARGE BOILER
500+ BoHP / Central plants
Central utility plants
Large industrial complexes
District steam systems
U.S. Department of Energy. Steam System Overview and Best Practices.
Goodway. (2018). Heat Exchanger and Boiler Maintenance: Chemical Descaling.
U.S. Environmental Protection Agency. (2012). WaterSense at Work: Boiler and Steam Systems.
Vulcan Descaler. FAMU/FSU College of Engineering Case Study.
Vulcan Indonesia. (2024). Food Processing Plant Installation Case Study.
Gradiant. (2024). CURE Chemicals – Industrial Boiler Best Practices.
Test makeup water hardness weekly
Inspect boiler tubes for scale during annual outage
Monitor stack temperature (elevated temps indicate scale) [2]
Track fuel consumption vs. steam production
Implement scale prevention on feedwater line
Optimize blowdown frequency based on conductivity [4]
Document all maintenance for DOE compliance tracking
With Vulcan, scale prevention is documented and verified—one less variable in your efficiency program.
Join manufacturers worldwide in eliminating scale, reducing fuel costs, and achieving permanent steam system efficiency.
Waslix (Vulcan Mineral Descaler) provides non-chemical, maintenance-free scale prevention for manufacturing boilers worldwide. Our technology helps industrial facilities follow DOE best practices while eliminating chemical treatment costs and compliance burdens. As proven at food processing plants and engineering facilities, Vulcan delivers permanent scale prevention without ongoing expenses. Create an account for detailed model specifications and pricing.
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