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Our Services & Systems

Corrosion Failure Analysis

Huguenot Laboratories is the leader in the treatment and prevention of Microbiologically Influenced Corrosion (MIC) in fire sprinkler systems. Our engineers’ expertise and experience in corrosion control for both new and existing fire sprinkler systems, will determine what corrective action is needed to mitigate leaks and failures in your fire sprinkler system. After reviewing all the information regarding your fire sprinkler system, Huguenot Laboratories will provide laboratory analysis to identify the extent of corrosion in order to determine the necessary corrective action.

Consulting

Our laboratory services include Water Analysis, Metallurgical Analysis, ICP Deposit Analysis (Inductively Coupled Plasma), Borescopic Video Inspection, Ultrasonic pipe wall thickness gauge measurement, and on-site inspection of your fire sprinkler system. Our laboratory analysis is specifically designed to identify the most effective corrosion management solution for your fire sprinkler system.

We offer chemical treatment programs, patented chemical feed systems, and corrosion coupon monitoring programs to accurately monitor and control corrosion within your fire sprinkler system.Our engineers are dedicated to providing quality service and are available to directly assist you. Huguenot Laboratories has over 30 years of experience servicing the fire sprinkler industry.

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Why is Fire Sprinkler Water black or dark?

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Corrosion Failure Analysis

Safety Data Sheets for all Huguenot Corrosion testing Laboratories products used for fire sprinkler leaks, prevention, and maintenance. For additional information on our metalurgical testing, complete water analysis testing, corrosion monitoring stations and equipment, please contact us with your questions or to schedule a consultation.

Inhibitors VS Nitrogen Treatment Comparison

Types of corrosion inhibitors

No Treatment vs. Nitrogen Treatment vs. Huguenot Inhibitor 90 day comparision study completed December 15th 2017 Hurricane Utah, Field trial of three ESFR systems.

COUPON SYSTEM LOCATION
  • City Water
  • Nitrogen Treated
  • Huguenot Treated
CORROSION RATE & NUMBER
  • 030 MILS Coupon E
  • 0.41 MILS Co
  • 0.13 MILS €
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  • The level of corrosion detected from the city water supplied fire sprinkler system had a sustained corrosion rate of 0.30 Mils Per Year (MPY).

  • The level of corrosion detected from the Nitrogen treated fire sprinkler system had a sustained corrosion rate of 0.41 Mils Per Year (MPY). The corrosion rate increased 36.6% with the application of Nitrogen when compared to the City water corrosion rate.

  • The level of corrosion detected from the ProGuard treated fire sprinkler system had a sustained corrosion rate of 0.13 Mils Per Year (MPY). The corrosion rate of the ProGuard treated fire sprinkler system decreased 56.6% when compared to the city water corrosion rate.

Note: The ProGuard treatment program reduced corrosion rates 68% below that of the Nitrogen treated fire sprinkler system.

Nitrogen Treatment Misconceptions

Important Facts About Nitrogen in Fire Sprinkler Systems

The water treatment industry has been using corrosion control chemistries for decades to protect industrial heating and cooling (HVAC) systems from the damaging effects of corrosion. Corrosion in these systems is very diverse. There are corrosion mechanisms that influence corrosion in all industrial water systems, including wet fire sprinkler systems. In these systems, the types of corrosion are influenced by overall water quality. The most damaging corrosion being under-deposit corrosion. This type of corrosion is a by-product of bacterial contamination and overall water quality.

High hardness waters will precipitate soluble minerals such as Calcium, Magnesium, Silica, and Chlorides. When the temperature of water increase, (the higher elevation areas of a warehouse), the soluble minerals become unstable and precipitate out of solution to form a deposit. When these deposits form in a piping system, an environment now exists where bacteria flourish and the corrosion process reverts to an electrochemical corrosion process. Bacteria are well documented at initiating under-deposit corrosion.

Nitrogen Treatment Misconceptions
  1. What does Nitrogen do in my wet system sprinkler? Does it truly reduce the dissolved oxygen content in water? The correct answer is NO, Nitrogen will not remove the oxygen from the wet sprinkler system water. Venting the trapped air is the only way to limit trapped air in the headspace of a sprinkler system. Save your money on nitrogen and consider a Huguenot Air release system.

  2. Doesn’t Nitrogen kill the bacteria in my wet system? The correct answer is NO, Nitrogen promotes bacterial growth, Analytical testing has verified significant Ammonia blooms of bacterial growth in systems treated with Nitrogen.

  3. Does Nitrogen control corrosion? Doesn’t it stop all corrosion as documented by other corrosion management companies? The correct answer is NO, Other companies claim they have an electronic device that is a corrosion monitoring system, but in reality, what they sell you is a device that lets you know it is time to replace your fire sprinkler system. The corrosion monitoring system supplied by others will indicate you have a severe corrosion problem only after you have experienced a 35 MILS of pipe wall thickness loss due to corrosion. This lets you know that you have lost 30% of your piping system due to corrosion. A corrosion management program supplied by Huguenot gives real-time data in 90-day increments of corrosion rates per ASTM guidelines with accuracy down to 0.01 Mils Per Year (MPY).

  4. Ok, if Nitrogen doesn’t stop corrosion would a corrosion inhibitor do any better? The correct answer is YES, Corrosion inhibitors are well documented to control corrosion rates down to 0.02 Mils Per Year.

  5. I can’t see the inside of my pipes, how do you know if a corrosion inhibitor really works? Is there a way to verify the results? An ASTM-certified corrosion coupon program by Huguenot Laboratories gives real-time data in 90-day increments of how well the results work. The corrosion coupon pictured below shows a nitrogen-treated system versus a Huguenot corrosion inhibited system. The Nitrogen treated system had a documented corrosion rate of 2.8 Mils Per Year. The Huguenot corrosion inhibited systems had a documented corrosion rate of 0.02 Mils Per Year. That indicates that a schedule 10 pipe measuring 120 Mils of wall thickness will have a service life of 6,000 years with Huguenots proven and time-tested treatment programs! The Nitrogen treated system had a corrosion rate 140 times greater than the corrosion inhibited system. Be sure to ask your corrosion management company to give you physical test data that verifies the results!

    Nitrogen Treatment Misconceptions Nitrogen Treatment Misconceptions
  6. If corrosion inhibitors work so good why is Nitrogen being promoted by other companies as the only treatment choice for my wet system? The correct answer is NFPA only recommends using corrosion and bacterial inhibitors to address corrosion issues in wet systems. Nitrogen is not recommended or referenced as a treatment method for wet fire sprinkler systems.

  7. Are there listing requirements to use corrosion inhibitors in fire sprinkler systems? The latest version of NFPA 25 indicates that corrosion and bacterial inhibitors shall be compatible with each other and the system components of the sprinkler system. The UL 1821-B committee is actively reviewing test methods to satisfy this requirement.

  8. What do chemical manufacturing companies like Huguenot do to satisfy this requirement? Huguenot has done extensive formulary testing with many of the component manufacturing companies like Victaulic and Spears. Their testing has verified 100% compatibility with those components.

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Nitrogen Treatment VS Huguenot Inhibitor

COUPON SYSTEM LOCATION
  • City Water
  • Nitrogen Treated
  • Huguenot Treated
CORROSION RATE & NUMBER
  • 030 MILS Coupon E
  • 0.41 MILS Co
  • 0.13 MILS €
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Our Proguard treatment reduced corrosion rates 68% below that of a Nitrogen treated fire sprinkler system.

Contrary to popular belief, nitrogen gas treatment does NOT control corrosion, kill bacteria, or reduce dissolved oxygen content.

Other companies claim to have an electronic device that is a corrosion monitoring system. Unfortunately, all this device does is alert you when your piping system has lost 30% due to corrosion.

By contrast, a corrosion management program supplied by Huguenot gives real time data in 90 day increments of corrosion rates per ASTM guidelines, with accuracy down to 0.01 Mils Per Year (MPY).

Huguenot Labs offers the industry’s only performance-based guarantee that assures corrosion rates are maintained at a maximum sustained rate of 2.0 Mils Per Year.

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Fire Sprinkler Corrosion Facts

Important Facts About Nitrogen in Fire Sprinkler Systems

Did you know 1000 gallons of water can create (Corrode) 32.5 pounds of Iron Oxide in just 30 days? That means that iron from your steel pipe is being converted to iron oxide. Iron oxide is a key component found in deposits discovered in fire sprinkler systems. Analysis of deposits in fire sprinkler systems confirms that 90% of the deposited material found in fire sprinkler systems is iron oxide (what is left of your steel pipe).

What you really need to know about cleaning and treating your fire sprinkler system.

The cleaning and treatment of fire sprinkler systems have been a challenging process for most to understand. Different companies have recently tried to use conventional cooling tower and boiler treatment technologies with limited or no success. The confusion in the industry is widespread and becoming more complicated by the day.

Wet and dry pipe sprinkler systems operate in completely different ways and have individual corrosion problems that are just as varied. Fire sprinkler systems are unlike any other water-based piping system both wet and dry. The wet fire sprinkler systems are filled with stagnant oxygen-rich waters that are then held at relatively high pressures (150 to 175 psi). The typical wet fire sprinkler system design is one that has many high point areas where trapped air is likely. The presence of trapped air in a pressurized fire sprinkler system can create a unique environment where the remaining Oxygen is pressed back into the water. Oxygen at atmospheric pressure will dissolve naturally or equilibrates into the water at a recorded concentration of 8 Parts Per Million (PPM). The fire sprinkler system with trapped air held at an operating pressure of 175 psi will see elevated dissolved oxygen levels of 35 to 40 PPM in these high-point air entrapped areas. This high oxygen content creates an environment where the steel pipe can quickly corrode. Corrosion by-products create deposits that can quickly lead to conditions considered favorable for advanced bacterial growth. Bacterial colonization of deposits leads to the creation of organic acids that quickly destroy any steel it comes in contact with. Once a failure or pinhole leak is discovered, wet systems are typically drained and repaired, and then refilled with more oxygen-rich waters. This continues to advance the destructive corrosion process in your fire sprinkler system.

Fire Sprinkler Corrosion Facts

Understanding this complex environment and the corrosion processes involved is the only way a concise corrosion mitigation plan can be developed. The dry or preaction fire sprinkler systems have corrosion issues completely different from what is witnessed in wet sprinkler systems. Condensing waters from the air compressor source is acidic with no buffering ions present. This low pH environment coupled with the fact that there is an overabundant source of Oxygen creates a corrosion environment where the only limiting factor to stop the corrosion process is the steel or iron pipe.

The assessment of your fire sprinkler system is a critical first step in determining the path to a successful cleaning and treatment program. A single drum treatment program can not and will not address the complex corrosion processes that occur in the many different fire sprinkler systems. Proper cleaning of a fire sprinkler system is a process that other over corrosion mitigation companies commonly overlook. The failure to properly clean a fouled sprinkler system will only lead to future problems. Other single drum treatment programs completely miss the point of controlling corrosion. They sterilize the system while providing no protection from corrosion. This readily available technology also presents significant health risk concerns if a release of a sprinkler head should occur. Other boiler-like treatment programs pretend to control corrosion by simply elevating the pH of the water within your fire sprinkler system. The elevation of the water’s pH completely misses the sheer fact that soft metal components like brass, copper, and bronze all become subjects to a high pH corrosion attack know as dezincification.

The bottom line is to pick a corrosion mitigation company that has developed technologies to better the industry, not just put a band-aid on a particular problem.

Through years of research and development, Huguenot Laboratories has set the standard for the cleaning and treatment of water-based fire protection systems. This proprietary environmentally friendly technology has been adopted as the “best practice program” for addressing corrosion in fire sprinkler systems. Our cleaning and treatment programs are proven technologies that are backed with the industry’s only money-back performance guarantee.

Oxygen Cell Corrosion

Galvanic Corrosion

This type of corrosion is caused by dissimilar metals within close proximity to each other in a wet fire sprinkler system. The water chemistry can affect this type of corrosion and should be considered in the design phase of any fire sprinkler system. The galvanic chart shows the corrosive nature of metals.

Those metals at the top of the chart will corrode before those at the bottom. Therefore iron pipe will corrode before brass or copper. The dissolved iron will react with minerals in the water and precipitate as deposits on piping, values, etc. These deposits can now cause under-deposit corrosion.

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Galvanic Corrosion

Dezincification Corrosion

This form of corrosion occurs when the metals in brass (copper and zinc) get separated from each other. The zinc will get extracted from the brass due to the water chemistry attacking the zinc. This will leave a white type of deposit on the metal surface.

This is commonly known as plug type dezincification. Weeping occurs within the system because of the loss of metal. Pipe failure can occur with this type of corrosion.

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Dezincification Corrosion

Graphitic Corrosion

This type of corrosion is caused by dissimilar metals within close proximity to each other in a wet fire sprinkler system. The water chemistry can affect this type of corrosion and should be considered in the design phase of any fire sprinkler system. The galvanic chart shows the corrosive nature of metals.

Those metals at the top of the chart will corrode before those at the bottom. Therefore iron pipe will corrode before brass or copper. The dissolved iron will react with minerals in the water and precipitate as deposits on piping, values, etc. These deposits can now cause under-deposit corrosion.

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Graphitic Corrosion

Order Products Direct From Huguenot Laboratories

Products can be ordered online and some products, due to shipping considerations, require a custom quote. Please browse our products using the left category navigation menu or contact us for a telephone quote.

Laboratory Testing

Laboratory Testing

Price: $233.00
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Fire Sprinkler Test Kits

Fire Sprinkler Test Kits

Price: On request
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Corrosion Monitoring Equipment

Corrosion Monitoring Equipment

Price: $233.00
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Free Treatment Demonstration Kit

Free Treatment Demonstration Kit

Price: Free
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