Frost Heave Prevention

Frost Heave Prevention systems can prevent the ice buildup in the ground underneath cryogenic tanks. Ice buildup can cause problems such as unwanted or uncontrolled movement or elevation of the tank.

Frost Heave Prevention System – A Complete Heat Management System Approach

nVent Thermal Management offers a frost heave prevention system that can prevent frost heave by applying thermal insulation around cryogenic tanks and by applying electric heat trace cables to the concrete layers underneath the tank.

We engineer and design a complete turnkey freezer frost heave system that includes heat trace cables, a power distribution system, and a control and monitoring system to fit your unique application.  Our solutions work on all types of large diameter storage tanks including:

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  • Above Ground Tanks
  • Underground Tanks
  • Above Ground Tanks with Ground Fill to Top
  • Tanks with load bearing thermal insulation (usually Foamglas) supporting the tank

nVent Thermal Management can design the most optimized Frost Heave Prevention system for you by applying thermal analyses modeling and optimized heating technology. In the design we take several parameters into consideration, including:

  • Tank heating requirements to maintain the fluid temperature
  • Heating system characteristics and heating element spacing underneath the tank
  • Bottom insulation thickness and thermal conductivity
  • Project specific requirements

When our advanced products are combined with our engineering services, you get an integrated solution that is strategically planned and executed for an optimum heat management system (HMS).

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Premiere Complete Turnkey System

nVent Thermal Management engineers design a complete turnkey frost heave prevention system based on a comprehensive thermal analysis using:

  • State-of-the-art SlabHeat™ software design tool
  • 2D- and 3D- finite element analysis (FEA)

These engineering design services are essential to establishing the ideal heat input for the tank base and to enhance the reliability and efficiency of the frost heave prevention system. We can optimize designs to minimize installed and operating cost.

Engineering design service deliverables, depending upon the project scope, can include:

  • Determining heat loss, heat input and power requirements
  • Establishing heater spacing
  • Determining thermal profile patterns based on FEA
  • Establishing electrical and thermal performance parameters
  • Creating tank specific engineering detail drawings
  • Writing system installation instructions

The selection of the appropriate technology can be heavily dependent on storage, technology, site, and power distribution requirements. The technologies include:


Self-Regulating Technology

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RAYCHEM FHP self-regulating electric heat trace cables are available for all tank sizes and construction; they can be cut to length and terminated in the field. FHP heating cables have an unconditional T-rating simplifying design for use in hazardous areas. The heating cables are designed for use in hazardous and nonhazardous areas, including areas where corrosives may be present. RAYCHEM FHP heat trace cables meet the requirements of international and national standards and codes.


Parallel Resistance Constant Wattage Technology

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RAYCHEM FHPC parallel resistance, constant power density (parallel constant wattage) electric heat trace cables are available for all tank sizes and construction. FHPC heat trace cables can be cut to length and terminated in the field. The heating cables are designed for use in hazardous and nonhazardous areas, including areas where corrosives may be present.


Skin-Effect Heat-Tracing Systems Technology

RAYCHEM STS skin-effect heat tracing system is a versatile engineered heat management system configured to deliver heat for medium to long length pipelines, including tank foundation heating.

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  • The RAYCHEM STS system consists of a thermally-rated, electrically insulated wire installed inside a ferromagnetic heat tube. The insulated wire is connected to the heat tube at the end termination, and an AC voltage source is connected between the heat tube and insulated wire at the power connection. AC current flows down the wire, returning on the inside surface of the tube.
  • The STS system is electrically safe and produces heat in the ferromagnetic tube through the effects of two well-known electrical phenomena: Skin Effect and Proximity Effect.
  • These phenomena cause the current flowing in the heat tube to be concentrated on the inner surface; the current concentration is so complete there is virtually no measurable voltage on the outer wall of the heat tube.
  • Heat is also generated due to the resistance of the heat tube and STS wire, and through eddy currents and hysteresis in the heat tube.

Advanced Control Systems and Power Distribution Systems

The selection of the appropriate advanced control system and power distribution system heavily depends on your specific frost heave prevention requirements.

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