When an industrial coating is too viscous to move efficiently through the delivery system, the problem can extend beyond pumping. In these applications, maintaining the right temperature can help to achieve more consistent material delivery and spray performance.
Heated fluid delivery systems can heat or maintain coating material within the temperature range specified by the manufacturer. Depending on the application, this may involve heated tanks, material heaters, heated hoses or circulation systems. However, heating is not suitable for every coating. The material’s chemistry, viscosity, temperature requirements and overall equipment configuration should be evaluated first.
In this guide, we explore when heating can be useful, how it affects high-viscosity material flow and what to check before selecting a heated system. AEMCO supplies coating equipment with heating options for demanding applications involving high-viscosity and temperature-sensitive materials.
What Is a Heated Fluid Delivery System?
A heated fluid delivery system is designed to heat or maintain a coating at the required temperature as it moves through the material delivery process. Depending on the equipment and application, this can involve different heating methods and components.
A system may include:
● Heated tanks or hoppers
● Primary material heaters
● Heated hoses
● Fluid circulation systems
● Temperature controls and monitoring equipment
The objective is not simply to make the coating hotter. Instead, the system is intended to maintain the material within the temperature range specified by the coating manufacturer so it can be pumped and sprayed appropriately.
Different coating systems use different heating configurations. AEMCO‘s Graco-related equipment includes options such as heated tanks, primary heaters and heated-hose or fluid-circulation components for demanding coating applications.
When Does a Coating Need Fluid Heating?
Not every coating requires heating. Whether it is appropriate depends on the material and the manufacturer’s application requirements.
High-Viscosity Materials
High-viscosity coatings can create more resistance as they move through pumps and hoses, making them harder to pump and atomize. When the manufacturer permits heating, bringing the material to the appropriate temperature can reduce viscosity and improve flow through the delivery system.
The aim is to achieve the required flow and spray performance without relying only on increased pump pressure.
Temperature-Sensitive Application Requirements
Some coatings have specific temperature requirements for proper application. Changes in material temperature can affect viscosity, flow and spray behaviour.
In these cases, a heating system can help maintain the material within the manufacturer’s specified temperature range, supporting more consistent application. Always check the coating’s technical data sheet before introducing heat.
High-Output Applications
High-volume coating operations often involve continuous material delivery over extended periods. Maintaining consistent material conditions can become more important as production demands increase.
Heating may be useful when the coating needs to remain within its required temperature range from the supply point to the spray gun. The appropriate configuration will depend on factors such as material viscosity, required output, hose length and the overall equipment setup.
How Heating Can Help High-Viscosity Coatings Flow More Consistently
The relationship can be viewed as:
Material temperature → viscosity → pumpability → fluid delivery → spray performance
As the temperature of some high-viscosity coatings drops, their viscosity can increase, making them harder to pump and atomize. When heating is permitted by the manufacturer, appropriate temperature conditioning can reduce viscosity and improve material flow.
This can support:
● Easier pumping
● More consistent material delivery
● Better atomization in suitable applications
● More predictable spray performance
The goal is not to make the material as hot as possible. It is to maintain the manufacturer’s specified temperature range. Similarly, increasing pump pressure is not always the solution. Low material temperature, unsuitable hose configuration, incorrect pump sizing or other equipment issues may be the actual cause of poor flow.
Heated Hoses: When Are They Useful?
Heating the coating at the tank or primary heater may not be enough when material travels through a long delivery path. As it moves through the hose, temperature can change, affecting viscosity and flow.
Heated hoses for coatings help to maintain the required material temperature during delivery and can be useful when:
● The delivery path is long
● Consistent material temperature is required
● Viscosity is sensitive to temperature changes
● The application involves continuous material delivery
Heated hoses should be selected as part of the complete system, with their length, heating capacity and compatibility matched to the coating and equipment. AEMCO‘s XP-hf equipment includes optional electrically heated hose control, along with heated hose and fluid-circulation options for applicable systems.
When Heating May Not Be the Right Solution
Heating is not always the answer to poor coating flow or spray performance. First, identify whether the issue is actually related to material temperature or another part of the system.
Heating may not be appropriate when:
● The manufacturer does not permit heating
● The coating has temperature limitations
● The pump is incorrectly sized
● The spray tip is unsuitable
● The hose is too narrow or excessively long
● Pressure or flow settings are incorrect
● Equipment components are worn or damaged
● The material has been improperly stored or conditioned
For example, heating will not resolve excessive pressure loss caused by an unsuitable hose. Always review the coating’s technical data sheet and consider viscosity, pressure, temperature and application requirements before configuring a heated system.
How to Choose the Right Heated Fluid Delivery Configuration
Selecting industrial coating heating systems requires more than choosing a heater with sufficient capacity. The heating configuration should work with the material, pump and spray equipment as one system.
1. Coating Chemistry
Start with the coating manufacturer’s technical documentation. Different coating chemistries can have different temperature limitations and application requirements.
2. Required Material Temperature
Determine whether the coating manufacturer specifies a particular material temperature or operating range. Do not establish a temperature setting based solely on the equipment’s maximum heating capability.
3. Material Viscosity
Understand the coating’s viscosity under the intended application conditions. If viscosity is already suitable for the equipment, additional heating may not provide a meaningful benefit.
4. Required Output
Consider the required flow rate and production volume. Higher-output applications may require a heating configuration capable of maintaining material conditions during continuous delivery.
5. Hose Length and Diameter
Hose dimensions influence material flow and pressure loss. Long delivery paths may also make temperature maintenance more important.
6. Heating Method
Depending on the application, the system may use heated tanks, hoppers, primary heaters, heated hoses or fluid-circulation components. The appropriate method depends on the coating and overall system design.
7. Equipment Compatibility
The pump, heater, hoses, spray gun and other components should be compatible and correctly configured for the coating. A heating component should not be treated as a standalone solution.
How Heating, Pressure, Hose and Flow Rate Work Together
Heating is only one variable in an industrial coating application. Material temperature interacts with several other factors that determine how effectively the coating reaches the spray gun.
These include:
● Material temperature
● Material viscosity
● Pump pressure
● Hose length and diameter
● Spray tip size
● Flow rate
● Application technique
For example, a high-viscosity coating may require temperature conditioning to achieve suitable flow. At the same time, the system still needs an appropriately sized pump, hose and spray tip.
If material flow is poor, increasing pressure may appear to be an obvious solution. However, excessive pressure can introduce other application issues and does not correct problems caused by unsuitable equipment or material conditions.
The better approach is to evaluate temperature, viscosity, pressure, hose configuration and flow rate together. This provides a clearer picture of whether heating is actually needed.
What to Check Before Using a Heated Fluid Delivery System
Before introducing heating into an industrial coating application, use the following checklist:
● Review the coating manufacturer’s technical data sheet.
● Confirm whether heating is permitted.
● Identify the manufacturer’s specified material temperature range.
● Check the coating’s viscosity and flow requirements.
● Determine the required output.
● Review hose length and diameter.
● Evaluate the required heater capacity.
● Check temperature controls and monitoring.
● Confirm compatibility between the pump, heater, hoses and spray equipment.
● Ensure operators understand the system’s operating requirements.
Avoid using universal temperature settings for industrial coatings. The appropriate temperature depends on the specific material and should come from the manufacturer’s documentation.
Why Choose AEMCO for Heated Industrial Coating Equipment?
AEMCO supplies coating and surface-preparation equipment for demanding industrial applications, including equipment from Graco.
Its product range includes systems such as Graco XP-hf, XM and Reactor equipment for specialised coating applications. Depending on the system and application, heating options can support the handling of high-viscosity and 100% solids materials.
AEMCO also provides equipment demonstrations, genuine spare parts and authorised Graco service support. This can help coating professionals select equipment that is appropriately configured for their material and application requirements.
When evaluating industrial coating equipment, it is important to consider the complete material-delivery system rather than selecting individual components in isolation.
Conclusion
Heated fluid delivery can be useful when an industrial coating‘s viscosity, application requirements or delivery conditions make temperature control important. High-viscosity materials, long fluid-delivery paths and high-output applications are examples where heating may need to be considered.
However, heating is not a universal solution. The coating manufacturer’s requirements should determine whether heating is appropriate, while factors such as pump pressure, hose configuration, flow rate and spray-tip selection should also be evaluated.
If you are selecting equipment for a high-viscosity or temperature-sensitive coating application, AEMCO can help to evaluate suitable coating equipment and system configurations.
Frequently Asked Questions
● What is a heated fluid delivery system?
A heated fluid delivery system uses components such as material heaters, heated tanks, heated hoses or circulation systems to heat or maintain coating material within an appropriate temperature range during delivery.
● When should industrial coating materials be heated?
Industrial coating materials should only be heated when the coating manufacturer permits or requires it. Heating can be useful for certain high-viscosity materials or applications where maintaining a specified material temperature is important.
● Do heated hoses improve coating material delivery?
They can help maintain material temperature as a coating travels through the delivery system, particularly over longer fluid paths. Their suitability depends on the coating and the overall equipment configuration.
● Can heating replace higher spray pressure?
No. Heating and pressure address different aspects of material delivery. If a high-viscosity coating is difficult to pump, appropriate heating may reduce viscosity when permitted, while pump pressure still needs to be correctly matched to the application.
● Are heated systems suitable for every industrial coating?
No. Some coatings may have temperature limitations or may not permit heating. Always review the coating manufacturer’s technical data sheet before selecting or operating a heated system.