Skip to Content
Exit

Category Archive:

Author Archives: Enerquip

  1. Industrial Heat Exchangers: Types, Applications, and How to Choose the Right One

    Leave a Comment

    Industrial heat exchangers play a critical role in many industries, from manufacturing and chemical processing to asphalt, food, and energy production. Most commonly, they are used to heat viscous fluids and materials and are often integrated into larger industrial heating systems.

    If you’re evaluating your options for industrial heat exchangers—whether you’re replacing existing equipment or exploring a more efficient solution for your facility—it’s important to understand the different designs available and how each one functions.

    Common Types of Industrial Heat Exchangers

    Industrial heat exchangers are available in several configurations, each designed to meet specific operational needs. Below is an overview of three widely used heat exchanger types and their typical applications.

    Suction Heaters

    Suction heaters are industrial heat exchangers that consist of a tube bundle mounted inside a shell that is open on one end and closed on the other. They use hot oil, steam, or another thermal fluid as the heat transfer medium.

    Installed directly inside a storage tank, suction heaters are designed to heat only the material being pumped through them—not the entire tank. They are commonly bolted to the manway flange and heat the product as it exits the tank.

    Best suited for:

    • Efficiently heating material as it leaves a storage tank

    • Applications where heating the entire tank is unnecessary

    • Processes requiring reduced energy consumption and faster heat-up times

    Shell and Tube Heat Exchangers

    Shell and tube heat exchangers are among the most versatile industrial heat exchangers available. They can be used to heat a wide range of materials, including asphalt, water-based liquids, and process fluids, using either steam or thermal oil.

    While similar in design to suction heaters, shell and tube heat exchangers differ in placement. Instead of being installed inside a tank, they are positioned externally to heat or cool material as it flows through the exchanger.

    Best suited for:

    • Facilities with limited tank space

    • Applications requiring external installation

    • Processes that need material heated in transit

    Bayonet Immersion Heaters & Coolers

    Bayonet immersion heaters and coolers are installed directly inside material storage tanks and consist of a tube bundle fully exposed to the surrounding fluid.

    Unlike suction heaters and shell and tube heat exchangers, bayonet heaters are designed to heat or cool the entire contents of a tank rather than just the material flowing through them. This makes them ideal for maintaining consistent temperatures across large volumes of material.

    Best suited for:

    • Heating, cooling, or maintaining temperature in large storage tanks

    • Applications requiring uniform heat distribution

    • Processes involving highly viscous materials

    How to Choose the Right Industrial Heat Exchanger

    Selecting the right industrial heat exchanger is an important investment decision. The ideal solution depends on several factors, including:

    • The type and viscosity of material being heated

    • Whether the entire tank or only flowing material needs to be heated

    • Available space and installation requirements

    • Energy efficiency goals

    • Long-term maintenance considerations

    Carefully evaluating these factors helps ensure optimal performance, efficiency, and return on investment.

    Ready to find the right industrial heat exchanger for your application?

    Enerquip’s experienced engineers work directly with you to design heat exchanger solutions tailored to your process, materials, and performance requirements. Whether you need a standard unit or a fully custom system, we’re here to help you maximize efficiency and long-term reliability. Contact Enerquip today to discuss your application.

     

    More from the Enerquip Blog

    Understanding Cold Process Heat Exchangers

    Serpentine vs. Helical Coil Heaters: Understanding the Differences

    How Pinch Analysis Can Unlock Energy Savings in Your Facility

    TEMA Types Explained

    How Almost Any Industry Can Benefit from Waste Heat Recovery

  2. Why Your Hot Oil Heater is Burning Up Your Heating Fluid

    Leave a Comment

    You did everything right. You reviewed specifications, confirmed operating requirements, and chose a fluid rated for your application. Your thermal fluid heater was installed correctly, the system was commissioned properly, and day-to-day operation appears normal.

    Yet despite all of this, your heat transfer fluid is degrading, or even burning up, inside the thermal fluid heater.

    If this sounds familiar, you’re not alone. Premature heat transfer fluid breakdown is a common issue in industrial process heating systems, even those that appear to be operating exactly as designed.

    The good news is that this problem usually has a clear, understandable cause—and once identified, it can be prevented.

    The Overlooked Cause of Heat Transfer Fluid Degradation

    In most cases, heat transfer fluid does not burn up because of improper installation, poor maintenance, or equipment failure. Instead, the root cause is often a misunderstanding of film temperature and how it differs from operating (bulk) temperature.

    Film Temperature vs. Bulk Temperature

    Heat transfer fluids are typically selected based on bulk temperature, which is the temperature of the fluid as it exits the heater during operation.

    However, thermal fluid heaters are engineered around film temperature—the temperature of the thin layer of fluid in direct contact with the hottest internal surfaces of the heater coil. This is where thermal degradation begins.

    How Heater Design Influences Film Temperature

    Film temperature is affected by several variables, including:

    • Heater design and coil geometry

    • Heat flux

    • Flow rate

    • Operating temperature

    • System turndown and firing rates

    Different heater designs manage these variables in different ways, which is why understanding the relationship between heater design and fluid selection is critical.

    Why Heat Transfer Fluid “Burns Up” in Otherwise Functional Systems

    In many cases, fluid degradation occurs because:

    • The heat transfer fluid was selected based on bulk temperature only

    • Actual film temperature exceeds the fluid’s maximum rating

    • Heater design and operating conditions were not evaluated together with fluid limits

    When these factors are misaligned, even a well-designed and properly maintained system can experience fluid failure.

    How to Prevent Heat Transfer Fluid Breakdown

    Preventing fluid degradation requires a system-level approach. Two strategies are particularly effective.

    1. Select Heat Transfer Fluid Based on Film Temperature

    When choosing a heat transfer fluid, it’s essential to understand not only the system’s operating temperature but also the maximum film temperature the heater will generate.

    Selecting fluid that can withstand peak film temperatures helps:

    • Reduce thermal cracking and oxidation

    • Minimize carbon and sludge formation

    • Extend fluid service life

    • Improve heater efficiency

    • Lower long-term maintenance and operating costs

    While higher-temperature-rated fluids often have a higher upfront cost, they frequently reduce total cost of ownership over the life of the system.

    2. Consider Heater Design Based on Application Requirements

    Different applications benefit from different heater designs. Evaluating how heater geometry influences film temperature can help optimize fluid life and system performance.

    For applications where minimizing film temperature is a priority, heater designs that provide greater spacing between coils—such as serpentine coil thermal fluid heaters—can reduce peak film temperatures under comparable operating conditions.

    Helical coil heaters, when properly specified and paired with suitable heat transfer fluid, remain an effective and dependable choice for many industrial processes. The key is ensuring that heater design, operating conditions, and fluid selection are considered together rather than independently.

    A System-Level Approach Delivers the Best Results

    The most reliable thermal fluid systems are those where heater design, operating temperature, and heat transfer fluid selection are engineered as a unified system.

    When these elements are aligned, facilities can achieve longer fluid life, improved efficiency, and more consistent process heating—regardless of heater style.

    Stop Premature Heat Transfer Fluid Failure

    If heat transfer fluid degradation is a recurring issue in your facility, it’s often a sign that film temperature and fluid limits are not properly matched—not that your equipment is failing.

    With decades of experience designing and manufacturing industrial thermal fluid heaters, Enerquip works with plant and facility managers to:

    • Identify the true cause of fluid breakdown

    • Evaluate heater design and operating conditions

    • Select appropriate heat transfer fluids

    • Optimize long-term system performance

    Don’t accept recurring fluid replacement or inefficient heating as unavoidable. With the right system design and engineering support, thermal fluid heaters can operate reliably and efficiently for years. Contact us or request a quote today.

     

    More from the Enerquip Blog

    Serpentine vs. Helical Coil Heaters: Understanding the Differences

    Why More Facilities Are Turning to Hot Oil Heating Systems Over Steam Boilers

    How to Make the Most of Your Scheduled Maintenance Shutdown

    How to Store Your Process Equipment Before Installation

    How to Choose the Right Thermal Heating Fluid for Your System

    Why Hot Oil Heater Film Temperature Matters

  3. Understanding Cold Process Heat Exchangers

    Leave a Comment

    Cold-process systems are essential for products or processes that require consistently low temperatures. These applications demand equipment that stays reliable even when exposed to extreme thermal swings, making design and fabrication quality especially important.

    At Enerquip, we engineer cold-process heat exchangers that maintain stable performance while protecting product integrity. Before diving into the design elements behind this type of equipment, let’s start with the basics.

    What Is “Cold Process”?

    “Cold process” refers to operations where fluids are cooled well below ambient temperature. In some cases, this is simply controlled chilling. In others, it can involve cryogenic conditions depending on the process.

    What matters most isn’t the number on the thermometer—it’s what those temperatures do to the equipment.

    When metal gets cold, it shrinks. When it warms back up, it expands. And when that cycle repeats over and over, stress builds at welds, joints, tube sheets, and mechanical connections. If the exchanger isn’t built to handle that movement, it can lead to cracking, misalignment, leaks, and fatigue failure over time.

    Where Cold-Process Heat Exchangers Are Used

    Cold-process systems show up across a wide range of industries. Any operation that relies on stable, predictable cooling typically has a low-temperature process stage. Common applications include:

    • Aerospace and advanced engineering – temperature conditioning and fluid cooling
    • Pharmaceuticals and biotech – protecting temperature-sensitive formulations
    • Chemical processing – cooling reactions and stabilizing intermediates
    • Food and beverage – chilling, cold storage, and process control
    • Industrial manufacturing – cooling oils, fluids, and thermal equipment

    Cold process doesn’t belong to one industry—it’s a design challenge that shows up anywhere low-temperature performance is non-negotiable.

    What Makes Cold-Process Engineering Different?

    Designing an exchanger for low-temperature operation involves far more than increasing heat transfer. It means building an exchanger that remains dependable as materials contract, stresses shift, and temperatures move rapidly.

    Key engineering considerations include:

    1. Material Selection

    Not all alloys behave the same at low temperatures. Stainless steel, such as 304L, is commonly used because it remains strong and ductile in cold service and provides strong resistance to thermal fatigue.

    1. Tube Sheet and Tube Joint Integrity

    Cold cycles put stress on every connection, and tube joints are one of the most important areas to reinforce. Depending on service requirements, exchanger designs may incorporate:

    • Roller expansion
    • Seal welding
    • Double-grooved tube sheets
    • Joint designs that reduce movement and fatigue over time

    The goal is simple: maintain a leak-free joint even through aggressive cycling.

    1. Flow Routing for Stable Performance

    Cold-process exchangers often use a multi-pass configuration to balance heat transfer performance while managing pressure drop. Flow routing becomes especially important in low-temperature service because operating conditions can change quickly and dramatically.

    1. Stress Control During Fabrication

    Cold process increases sensitivity to misalignment and distortion. Fabrication and assembly practices must be tightly controlled to ensure the exchanger stays aligned and stable through contraction forces.

    That means extra attention to:

    • Machining tolerances
    • Welding sequence and heat control
    • Tube alignment and support
    • Final assembly and inspection practices

    Welding for Cold Process

    Enerquip welds every exchanger using qualified procedures and tight quality controls. For cold-process service, welding requirements are often more specific due to the effects of low temperatures and thermal cycling. This may include:

    • Controlled heat input
    • Application-specific filler material selection
    • Enhanced inspection and testing

    These steps help ensure weld integrity through repeated contraction forces and temperature swings.

    Required Stamps and Certifications

    Cold-process exchangers need to meet strict performance and safety standards. These typically include:

    • Built to ASME Section VIII requirements and code-stamped.
    • TEMA guidelines, with class B or R selected based on severity of service.
    • Additional documentation or testing depending on the application

    These certifications confirm that the equipment can operate safely under both high pressures and low temperatures.

    A Look at Past Cold-Process Designs

    Over the years, Enerquip has supported a wide range of cold-process applications. While every exchanger is engineered based on the operating conditions and process requirements, many cold-process designs share common features, including:

    • Low-temperature-capable stainless steel, such as 304L
    • Multi-pass process channel configurations, often machined from forgings for strength and reliability
    • Heavy-duty connections and flanges, selected to support high pressure and minimize leak risk
    • Seamless U-tubes, typically roller expanded and seal welded for long-term performance
    • Vent and drain connections designed to remain accessible beyond insulation
    • Insulated shell assemblies, often using chloride-free insulation materials with stainless steel jacketing
    • ASME Code stamping and other documentation required for low-temperature service

    These features come together to create durable, long-lasting exchangers built for the demands of cold operation.

    Cold-Process Heat Exchangers from Enerquip Thermal Solutions

    Cold-process heat exchangers serve a vital role across many industries, helping protect products and processes where tight temperature control is non-negotiable. With careful material selection, strict welding practices, and compliance with industry standards, Enerquip builds units that deliver reliable performance in even the coldest conditions.

    Have a project that needs precise cooling? Let’s talk about the right design for your process.

     

    More from the Enerquip Blog

  4. Serpentine vs. Helical Coil Heaters: Understanding the Differences

    Leave a Comment

    When choosing a thermal fluid heater, coil design is one of the most important considerations. Both helical coil and serpentine coil technologies are proven solutions and continue to serve a wide range of industrial applications effectively.

    However, depending on operating conditions, maintenance expectations, and long-term performance goals, many facilities find that serpentine coil designs offer distinct advantages in efficiency, service life, and ease of maintenance.

    Understanding how these two designs differ can help you determine which option is best suited for your specific process.

    Understanding Helical vs. Serpentine Coil Designs

    Helical coil heaters use tubing wound into a spiral configuration. This compact design is cost-effective and well suited for applications with moderate temperature requirements and steady operating conditions.

    Serpentine coil heaters, on the other hand, use straight radiant tube sections arranged in a serpentine pattern. This configuration increases radiant surface exposure and allows heat to be transferred more evenly across the tubing.

    Both designs have their place—yet for many high-demand industrial environments, serpentine coils are often selected for their performance benefits.

    Helical Coil - Enerquip
    Helical Radiant Coil

    Serpentine Coil - Enerquip
    Serpentine Radiant Coil with Finned Economizer

     

    3 Reasons Facilities Often Choose Serpentine Coil Thermal Fluid Heaters

    1. Greater Heat Transfer Efficiency

    Serpentine coil heaters are typically 10% to 15% more efficient than helical coil designs, largely due to enhanced heat transfer characteristics and the integration of an economizer. The difference comes down to how each coil receives radiant heat:

    • Helical coils primarily receive radiant heat on the inner surface of the coil

    • Serpentine coils receive radiant heat on the front, sides, and back of the tubing

    This increased exposure allows for:

    • More uniform heat distribution

    • Higher achievable operating temperatures (often 200–250°F higher)

    • Reduced risk of localized hot spots

    As a result, serpentine coils can help maintain thermal fluid integrity and consistent system performance over time.

    2. Extended Service Life

    The manufacturing process also influences durability. Helical coils require tight bending, which can slightly alter tube wall thickness and introduce additional mechanical stress.

    Serpentine coils use straight tubing, which:

    • Preserves tube wall integrity

    • Reduces stress concentrations

    • Improves long-term reliability

    In many installations, serpentine coil heaters are found to last two to three times longer than comparable helical coil designs, with service lives extending well beyond 20 years under proper operating conditions.

    3. Simplified Maintenance and Repairs

    Maintenance considerations are often a deciding factor in coil selection.

    • In helical coil heaters, a tube failure may require replacement of the entire coil assembly

    • In serpentine coil heaters, sections of individual tubes can be replaced independently

    This modular approach can:

    • Reduce repair costs

    • Shorten downtime from weeks to days

    • Improve overall plant uptime and maintenance planning

    For facilities where production continuity is critical, this serviceability advantage can be significant.

    Choosing the Right Coil Design for Your Application

    Helical coil heaters remain a reliable and practical solution for many applications, particularly where space constraints, budget considerations, or moderate operating temperatures are primary factors.

    Serpentine coil heaters are often preferred when:

    • Higher efficiency is desired

    • Longer equipment life is a priority

    • Faster, more economical maintenance is important

    • Higher operating temperatures are required

    Ultimately, the best solution depends on your specific process requirements and long-term operational goals.

    Learn More About Serpentine Coil Heater Technology

    If you’re evaluating thermal fluid heater options, serpentine coil designs offer compelling advantages in efficiency, durability, and maintainability—while complementing, rather than replacing, traditional helical coil solutions.

    Contact us today to determine which coil technology is the best fit for your facility.

    More from the Enerquip Blog

  5. Heat Exchanger Helps Aloe Processor Improve Quality

    Leave a Comment

    Drawing on decades of thermal engineering experience, Enerquip was approached by a producer of pure aloe for medicinal and nutritional products to solve a critical cooling challenge. Operating in a tropical climate, the processor needed a reliable way to reduce bacterial growth, improve product quality, and extend shelf life—all while working within limited utility and staffing constraints.

    This case study highlights how Enerquip engineered a custom heat exchanger that delivered consistent, low-temperature cooling and long-term operational value.

    The Processing Challenge

    The aloe was harvested and packaged in a region where ambient temperatures regularly hovered around 95°F (35°C). These conditions accelerated bacterial growth during processing, which reduced shelf life and lowered the overall value of the finished product.

    Through testing, the processor determined that cooling the aloe to below 40°F (4.4°C) prior to packaging resulted in a significant improvement in quality. However, achieving that temperature presented several challenges:

    • Cooling water was not cold enough to meet process requirements

    • Utilities at the packaging site were limited to electricity only

    • Plant operators were not highly technical

    • Production occurred only a few times per season

    • Equipment needed to be easy to clean, move, and store

    Enerquip was asked to design a solution that addressed all of these constraints without adding unnecessary complexity.

    The Enerquip Solution: Shell and Tube Heat Exchanger with Integrated Chiller

    After reviewing the process and existing equipment, Enerquip’s thermal engineering team determined that a shell and tube heat exchanger would be the most effective and practical solution.

    Heat exchangers are designed to efficiently transfer heat from one medium to another and are commonly used in sanitary and industrial manufacturing. They consist of a bundle of tubes enclosed within a larger shell. In this application:

    • The aloe product flowed through the tubes

    • A cooling medium circulated around the tubes inside the shell

    • Heat transferred through the tube walls without the fluids mixing

    Several design factors influenced the final selection:

    • Viscous nature of the aloe product

    • Required inlet and outlet temperatures

    • Product flow rate and batch size

    • Ease of cleaning and sanitation

    • Seasonal operation and storage requirements

    To meet these needs, Enerquip designed a straight-tube, multi-pass shell and tube heat exchanger. This configuration allowed the aloe to pass back and forth through the exchanger multiple times, achieving the desired cooling before packaging. Removable bonnets were incorporated to allow for fast mechanical cleaning.

    Adding a Chiller to Achieve Target Temperatures

    Due to groundwater temperature limitations at the facility, Enerquip integrated an air-cooled chiller into the system. The chiller supplied a glycol-water mixture cold enough to cool the aloe to target temperatures in a single pass through the heat exchanger.

    Key benefits of the chiller system included:

    • Operation using plant electricity only

    • Simple push-button controls for ease of use

    • Minimal operator training required

    • Independent shut-off valves and removable hoses

    • Easy teardown, cleaning, and off-season storage

    This approach ensured reliable cooling performance without increasing operational burden on plant staff.

    Results and Impact

    The completed system delivered measurable improvements for the aloe processor:

    • Significantly reduced bacterial growth

    • Improved product quality and consistency

    • Extended shelf life

    • Simplified operation for non-technical staff

    • Efficient cleaning between production runs

    • Increased overall product value

    By combining a properly engineered heat exchanger with a chiller designed for the site’s limitations, Enerquip provided a durable, easy-to-use solution tailored to the processor’s real-world needs.

    Ready to Solve Your Process Cooling Challenge?

    Whether you’re working with viscous products, limited utilities, or demanding sanitary requirements, Enerquip designs a variety of stock and custom heat exchangers.

    Contact us today to discuss your application and performance goals.

    More from the Enerquip Blog

  6. Enerquip’s National CRN Speeds Up Delivery, Reduces Cost

    Leave a Comment

    When project schedules are tight, waiting on approvals can slow everything down—and add unnecessary cost. That’s where Enerquip’s national Canadian Registration Number (CRN) for 8” NPS heat exchanger designs makes a real difference for customers across Canada.

    Enerquip now holds a CRN for all Canadian provinces, except Alberta, for our stock and standard-design 8” NPS units. The result is no waiting for the CRN to be issued, faster order processing, and more predictable delivery timelines. Enerquip has also absorbed the upfront cost of obtaining this CRN and is passing those savings directly on to customers.

    What “National CRN” Means

    In this case, national means Enerquip’s design is registered across most Canadian provinces under a single CRN, rather than requiring a new CRN application for each project or jurisdiction. This simplifies compliance and removes a common bottleneck in the procurement process.

    Note: Alberta is excluded at this time. If your project is located in Alberta, contact Enerquip to discuss available options.

    What’s Covered Under Enerquip’s National CRN

    This CRN applies to a wide range of Enerquip 8” NPS heat exchanger configurations, including:

    • Five stock 8” NPS steam-to-liquid units: available for same-day or next-day shipment
    • Standard design 8” NPS steam-to-liquid units: shipped at current standard lead times (typically 8-9 weeks) or expedited when available
    • Standard design 8” NPS liquid-to-liquid units: ¾” tubes, available at standard or expedited lead times
    • 3-A compliant 8” NPS steam-to-liquid units: ¾” tubes, available at standard or expedited lead times

    Why This Saves Time and Money

    A typical CRN can take weeks—or even months—to obtain and may cost upwards of $1,500. With Enerquip’s national CRN already in place for stock and standard-designed 8” NPS units, customers can bypass that process entirely. Instead, the cost to reuse a CRN is typically around $250, delivering real savings while keeping projects on schedule. That means:

    • Shorter project timelines
    • Fewer administrative delays
    • Reduced compliance-related costs
    • Less risk of schedule-driven overruns

    It also gives engineers and procurement teams more flexibility, with hundreds of possible 8” NPS configurations registered under a single CRN.

    Built for Speed Without Compromising Compliance

    Enerquip’s national 8” NPS CRN supports stock units, standard designs, and aids in expedited delivery options, giving customers a faster path to compliant equipment while maintaining the quality and performance Enerquip is known for.

    Contact us to order or email parts@enerquip.com.

    >> View Our In-Stock Heat Exchanger Designs

  7. Chiller Tube Maintenance: A Step-by-Step Guide for Long-Term Efficiency

    Leave a Comment

    Regular chiller tube maintenance is essential for keeping HVAC systems working at maximum efficiency. While chillers may receive less attention during cooler months, periods of low demand are actually the ideal time to inspect, clean, and optimize chiller tubes before peak operating seasons return.

    Chiller tubes play a critical role in heat transfer and overall system performance. When tubes become fouled with scale or mineral deposits, energy efficiency can decline significantly—often leading to higher operating pressures, increased energy consumption, and reduced cooling capacity. A proactive maintenance strategy helps extend equipment life while lowering energy and maintenance costs.

    Below is a practical, step-by-step guide to effective chiller tube maintenance.

    Step 1: Start With Thorough Tube Cleaning

    Cleaning is the foundation of effective chiller tube maintenance. While a basic water flush can remove loose debris, it typically leaves behind scale and deposits—especially in tubes with ridges or enhanced surfaces.

    Mechanical Tube Cleaning

    Rotary tube cleaning systems equipped with brushes are highly effective at removing stubborn fouling. The rotating action allows brushes to reach grooves and irregular surfaces where buildup commonly occurs.

    When selecting brushes, match the brush type to the fouling:

    • Soft fouling (algae, mud, biofilm) requires softer brushes

    • Hard fouling (scale, mineral deposits) requires more aggressive brush materials

    Some cleaning systems also allow the application of corrosion inhibitors or antimicrobials during cleaning to help reduce future fouling.

    Chemical Descaling (When Needed)

    For severe buildup such as calcium, lime, or rust, chemical descalers may be required. Always confirm that cleaning chemicals are compatible with tube materials, especially for copper alloys or stainless steel. Consulting the equipment manufacturer or a specialist is recommended before chemical use.

    Best practice: Perform tube cleaning at least annually, or biannually for high-use systems.

    Step 2: Perform Eddy Current Testing

    Eddy current testing is a non-destructive inspection method used to evaluate tube integrity over time. While it does not detect active leaks, it can identify early-stage problems such as:

    • Corrosion and erosion
    • Mechanical damage
    • Wall thinning
    • Manufacturing or installation defects

    During testing, a probe generates a magnetic field inside the tube. Any disturbance in the signal indicates a potential defect at that location.

    Recommended frequency:

    • Chillers: every 2–3 years
    • Evaporators: every 3–5 years

    This testing helps facility teams plan repairs or replacements before failures occur.

    Step 3: Optimize Water Quality and Treatment

    Water quality directly impacts how often chiller tubes need to be cleaned. Poor water chemistry accelerates scaling, fouling, and corrosion.

    Closed-Loop Systems

    Most chillers operate in closed-loop systems, which generally require a one-time chemical treatment to inhibit corrosion and biological growth.

    Open-Loop Systems

    Condenser systems and cooling towers often operate as open-loop systems and typically require continuous water treatment to manage minerals, biofouling, and debris.

    Water treatment programs should be tailored to local water conditions. A qualified water treatment specialist can analyze water chemistry and recommend appropriate solutions.

    Step 4: Monitor Temperature and Flow Rate

    In addition to water chemistry, operating conditions influence chiller performance:

    Water temperature: Cooler water improves heat transfer efficiency, though lowering temperature should be considered a temporary efficiency boost, not a substitute for cleaning.

    Flow rate: Optimal flow velocity typically ranges between 3 and 12 feet per second.

    • Low flow can cause laminar conditions and reduced efficiency
    • Excessive flow can lead to vibration, tube wear, and mechanical damage

    Maintaining proper operating parameters helps prevent fouling and mechanical stress.

    Step 5: Create a Preventive Maintenance Plan

    Preventive maintenance is key to long-term chiller performance. A structured plan should include:

    • Routine inspections

    • Scheduled cleanings

    • Periodic testing

    • Water treatment monitoring

    Maintaining a daily or weekly operating log allows facility managers to track performance trends such as pressure changes, temperature differentials, and energy use. These trends help determine optimal maintenance intervals and identify issues early—before they become costly repairs.

    Over time, this data supports a customized maintenance schedule tailored to your specific system.

    Step 6: Know When Replacement Makes Sense

    Even with excellent maintenance, chillers have a finite lifespan. As systems approach 25–30 years of service, maintenance costs often rise while efficiency declines. Frequent tube failures, persistent performance issues, or outdated designs may indicate that replacement is the more economical option.

    When evaluating a new chiller or heat exchanger, work with a manufacturer that offers engineering expertise, durable materials, and application-specific designs to ensure long-term performance. Our engineers are here to help identify shell and tube requirements for a wide range of assets, including chillers. Request a quote today.

    More from the Enerquip Blog

  8. Pasteurization of Raw Milk: Preventing Contamination and Protecting Consumers

    Leave a Comment

    Raw milk, milk that has not undergone pasteurization, is often promoted for perceived health or nutritional benefits. As interest in raw milk has grown, so has its availability in certain regions. At the same time, public health data consistently shows an increase in foodborne illness outbreaks linked to raw milk and raw milk products.

    For dairy producers and processors, understanding the role of pasteurization is critical—not only for regulatory compliance, but also for consumer safety and long-term business sustainability.

    The Real Risks of Consuming Raw Milk

    Raw milk can carry harmful pathogens even when produced under clean and well-managed farm conditions. According to data from the U.S. Centers for Disease Control and Prevention (CDC), dozens of outbreaks across multiple states have been directly linked to raw milk consumption.

    Consumers who drink raw milk or eat products made from it are significantly more likely to experience foodborne illness and require hospitalization than those who consume pasteurized dairy products. These illnesses can be particularly dangerous for children, older adults, pregnant individuals, and those with weakened immune systems.

    Why Pasteurization Is Essential for Milk Safety

    Pasteurization is the process of heating milk to a specific temperature for a set amount of time to destroy harmful microorganisms such as Salmonella, Listeria, and E. coli. This step is proven to dramatically reduce the risk of foodborne illness without compromising the overall quality of the milk.

    Extensive research has shown that pasteurization maintains milk’s nutritional value. While small reductions in certain enzymes or vitamins may occur, these nutrients are not essential to human health or are readily available through other dietary sources.

    How Milk Contamination Occurs

    Even with strict hygiene protocols, contamination can occur at virtually any stage of milk production. Common sources of bacterial contamination include:

    • Udder infections in dairy cows
    • Insects or rodents in the production environment
    • Cross-contamination from employees, clothing, or equipment
    • Exposure to animal feces near milking areas

    Because these risks cannot be completely eliminated at the farm level, pasteurization remains the most reliable safeguard before milk reaches consumers.

    Incorporating Pasteurization Into Your Dairy Operation

    For dairies looking to implement or upgrade a pasteurization process, selecting the right equipment is a critical decision. Shell and tube heat exchangers are commonly used in dairy pasteurization systems due to their:

    • High heat transfer efficiency
    • Durability in continuous processing environments
    • Ease of cleaning and maintenance

    Stainless steel, particularly 304 stainless steel, is often the material of choice because it resists corrosion, minimizes fouling, and meets sanitary requirements for food and beverage processing.

    Meeting Sanitary Design Standards

    Pasteurization equipment should always be designed with hygiene and regulatory compliance in mind. 3-A Sanitary Standards, Inc. is widely recognized as the benchmark for hygienic equipment design in the dairy industry. Equipment built to 3-A standards helps ensure:

    • Cleanability and sanitary operation
    • Reduced risk of contamination
    • Compliance with industry and regulatory expectations

    Sanitary Heat Exchanger Solutions from Enerquip

    When it’s time to add or replace a shell and tube heat exchanger for dairy pasteurization, Enerquip offers reliable, sanitary solutions designed for food and beverage applications.

    Enerquip heat exchangers can be fabricated using 100% 304 stainless steel and manufactured in accordance with 3-A Standard 12-08, helping ensure safe, compliant, and efficient dairy processing. With both off-the-shelf models and custom-engineered solutions available, Enerquip supports dairy operations of all sizes. Request a quote today.

     

    More from the Enerquip Blog

  9. How to Prevent Food Recalls in Your Production Facility: Essential Strategies for Safer, Cleaner Operations

    Leave a Comment

    Food manufacturers carry a critical responsibility: delivering products that are clean, safe, and free from contamination. With consumer trust on the line—and increasingly stringent food safety regulations—preventing food recalls must be a top operational priority.

    This guide covers the key steps every food processing facility should take to reduce contamination risks, maintain sanitary operations, and safeguard brand reputation.

    Why Preventing Food Recalls Matters

    Even with high safety standards, mistakes and contamination events can occur. Undeclared allergens, improper sanitation, and microbial contamination continue to trigger food recalls across the industry. Some of the most common foodborne pathogens include:

    • E. coli
    • Listeria monocytogenes
    • Salmonella

    These contaminants can cause severe illness and even death if introduced into food or dairy products. According to the U.S. FDA, millions of Americans suffer from foodborne illness each year—reinforcing the importance of preventive controls.

    Beyond the threat to public health, food recalls can be financially devastating. A single recall can cost a company millions of dollars in direct expenses—not including long-term damage to brand reputation and consumer trust.

    1. Conduct Regular Process Reviews

    A sanitary production process is the foundation of safe food manufacturing. To reduce recall risks, facilities must perform regular reviews of their equipment, workflows, and preventive controls.

    Key process-review best practices include:

    Performing routine vulnerability assessments: Identify contamination risks—such as product flow bottlenecks, dead legs in piping, or equipment that is difficult to clean thoroughly.

    Scheduling ongoing inspections: Even during peak production periods, visual checks help monitor equipment condition and catch early warning signs. Follow quick inspections with more detailed evaluations to ensure thorough oversight.

    Reassessing compliance with food safety regulations: The Food Safety Modernization Act (FSMA) requires food processors to implement preventive controls and maintain documentation. Regular reviews ensure your operations stay aligned with regulatory standards.

    2. Invest in Sanitary, Easy-to-Clean Equipment

    Equipment design plays a major role in preventing contamination and supporting efficient, hygienic workflow. Two factors matter most:

    • Sanitary design and construction
    • Proper cleaning and maintenance
    Sanitary design essentials

    High-quality sanitary equipment includes:

    • Smooth, crevice-free surfaces
    • Rounded edges to prevent product buildup
    • Corrosion-resistant materials that minimize fouling

    Stainless steel shell and tube heat exchangers are widely used in food and dairy operations because they meet these criteria and deliver excellent thermal performance.

    Heat exchanger design options

    • Straight-tube heat exchangers: Fewer corners mean easier cleaning and reduced risk of fouling.

    • U-tube heat exchangers: Slightly more complex to clean, but highly effective with the right process and CIP system.

    Cleaning-in-Place (CIP) integration

    CIP systems clean equipment without disassembly by circulating hot water, steam, and cleaning chemicals through sanitary heat exchangers. CIP offers:

    • Consistent, reliable cleaning
    • Reduced water and chemical use
    • Minimal downtime

    3. Choose High-Quality Sanitary Heat Exchanger Equipment

    Your food safety systems are only as strong as the equipment you rely on. Working with a trusted sanitary equipment manufacturer ensures your processes meet strict hygienic standards.

    Why material choice matters

    Cross-contamination risks increase when equipment comes into contact with non-food-grade materials like carbon steel. Leading sanitary manufacturers avoid these materials to ensure product integrity. Enerquip, for example, manufactures product-contact surfaces exclusively from stainless steel and offers fabrication that meets 3-A Sanitary Standards and other food industry requirements.

    Sanitary surface finishes

    Smooth surfaces reduce bacterial harborage and product fouling. Enerquip heat exchangers feature:

    • Standard 32Ra surface finishes
    • Optional lower Ra or electropolished finishes for ultra-clean applications

    Protect Your Brand by Partnering with Experts in Sanitary Heat Exchangers

    The right equipment and preventive processes significantly reduce the risk of contamination and costly recalls. If you’re evaluating your current setup or designing a new process, collaborating with experienced heat exchanger specialists can help optimize safety and efficiency.

    Enerquip’s team can guide you through custom design options that support sanitary production, product integrity, and long-term reliability.

    Connect with Enerquip’s experts to explore how custom shell and tube heat exchangers can enhance food safety and reduce recall risk in your facility.

     

    More from the Enerquip Blog

  10. How Condensing Economizers Help Facilities Reclaim Latent Heat and Reduce Energy Costs

    Leave a Comment

    Boilers are important in many industrial operations, but they also send a lot of usable heat straight up the stack. A condensing economizer helps recover that energy by pulling heat (and water vapor) from boiler exhaust and turning it into usable thermal output.

    Condensing economizers are used in everything from food processing to healthcare to heavy manufacturing—anywhere steam and hot water are critical. By recovering heat that would otherwise be wasted, they can reduce fuel use, lower utility costs, and help facilities make real progress toward sustainability targets.

    What Is a Condensing Economizer?

    A condensing economizer is a heat-recovery unit—often built using indirect heat exchangers like shell and tube designs—that cools boiler flue gas below its natural dew point to capture both sensible heat and latent heat.

    In a typical natural-gas boiler, flue gas exits the stack at temperatures around 250°F or higher. Cooling it below 135°F, the dew point of water vapor, allows the economizer to reclaim a substantial amount of energy that would otherwise be lost.

    This recovered heat can then be used for:

    • Preheating boiler feedwater
    • Domestic or process hot water
    • Space heating
    • Other low-temperature process needs

    How Condensing Economizers Work

    When flue gas passes through the economizer, it is cooled using either a heat-exchange surface or direct water contact. As the vapor condenses, the latent heat released is transferred into a water stream—providing clean, efficient, and reusable energy.

    In indirect systems, flue gas flows over heat-transfer surfaces (often a shell and tube exchanger) while water flows inside the tubes—allowing energy to transfer efficiently without mixing the streams.

    The amount of recoverable heat depends on factors such as:

    • Fuel type
    • Flue gas temperature
    • Boiler load
    • Economizer design
    • Water temperature entering the system

    Recovering latent heat can increase boiler efficiency dramatically, often by 10% or more, depending on operating conditions.

    Types of Condensing Economizers

    Two primary designs are used in industrial applications, each with distinct advantages.

    1. Direct Contact Condensing Economizers

    In this design, hot flue gas enters a spray chamber where it comes into direct contact with cool water droplets.

    Benefits:

    • Very high heat-transfer efficiency
    • Effective water recovery
    • Simple mechanical design

    Limitations:

    • Heats water only to ~140°F
    • Requires a mist eliminator to prevent droplet carryover

    Direct-contact units are ideal when there is a consistent need for low-temperature process water.

    2. Indirect Contact Condensing Economizers

    Indirect systems commonly use shell and tube heat exchangers, where flue gas passes across the outside of the tubes and incoming water flows through the tubes, capturing heat while keeping the two streams separate.

    Benefits:

    • Can heat water up to ~200°F
    • Can cool flue gas to as low as ~75°F
    • Suitable for a wider range of processes

    Because they deliver higher water temperatures, indirect economizers are especially useful for preheating boiler feedwater or supporting space and process heating loops.

    Example:
    A food processing facility installed an indirect condensing economizer to reduce its deaerator steam load. By lowering flue gas temperature from 300°F to 120°F, the unit recovered 2 million BTU/hr and cut deaerator steam demand from 5,000 to 1,500 lbs/hr—resulting in substantial energy and cost savings.

    Key Considerations When Selecting a Condensing Economizer

    1. Water Quality and Neutralization

    Condensate from flue gas is often acidic and must be neutralized before discharge or reuse. Common treatment options include:

    • External heat exchangers
    • pH control systems
    • Filtration or membrane treatment
    2. Materials of Construction

    Because condensate can be corrosive, selecting durable materials is critical. Stainless steel and corrosion-resistant alloys are commonly used to ensure long-term performance in natural-gas boiler systems.

    3. Available Space and Operating Conditions

    Not all operations will benefit equally from economizer installation. For example:

    • Facilities that already reclaim most blowdown heat may see limited additional savings.
    • Plants with minimal demand for low-temperature water may benefit more from an indirect design than a direct-contact system.

    A site assessment helps determine the best approach for maximizing heat-recovery potential.

    Partnering With Experts for a Customized Solution

    Condensing economizers are rarely one-size-fits-all. Each facility has unique operating temperatures, fuel types, water demands, and mechanical constraints.

    Working with experienced heat-transfer engineers—like the team at Enerquip—ensures that your condensing economizer or shell and tube heat exchanger is designed, fabricated, and optimized specifically for your process.

    If you’re exploring ways to reduce energy consumption, improve boiler efficiency, or meet sustainability goals, a custom heat-recovery solution may deliver substantial long-term value.

    Ready to explore your options? Request a quote today.

    More from the Enerquip Blog