Description

The Spiral Immersion Heater is an engineered system designed to deliver high thermal density within spatially constrained vessels. By utilizing a precisely calculated helical geometry, this heater maximizes the length of the heating surface while minimizing the required penetration depth into the tank. This configuration is ideal for narrow sumps, shallow tanks, or retrofit applications where standard straight elements cannot fit.

Core Engineering Specifications

Thermal Design: The spiral element is engineered with a specific pitch-to-diameter ratio to ensure optimal spacing between coils. This prevents "bridging" of viscous media and allows for easy removal of the element for maintenance without the liquid solidifying around it.
Material Science:
Sheath Material: High-grade Stainless Steel 316/304 (or optional Incoloy/Titanium), selected for superior resistance to pitting and crevice corrosion in aggressive environments.
Filler: High-purity, high-density Magnesium Oxide (MgO). This is compacted using hydraulic pressure to achieve a density of >3.3 g/cm³, ensuring zero air gaps and maximum thermal conductivity.
Terminal Box: Heavy-duty cast aluminum or SS304, rated IP65/NEMA 4, to protect connections from moisture and dust.
Low Watt Density: The extended surface area of the spiral design reduces the surface loading (watts per square centimeter). This prevents the "burn-on" of organic materials and extends the life of the heating element significantly.

Advanced Quality Assurance & Testing Protocol

To guarantee reliability in critical operations, every Spiral Immersion Heater undergoes a comprehensive, multi-stage inspection process:
Continuity & Resistance Verification: Each phase is checked to ensure the resistance value matches the calculated design specification (±1% tolerance), guaranteeing the correct power output.
High-Potential (Hi-Pot) Safety Test: A dielectric strength test is performed at 2000V AC + 2x the rated voltage for a duration of 1 minute. This verifies the integrity of the insulation system and ensures no arcing occurs between the conductor and the sheath.
Insulation Resistance Test: Conducted using a 500V DC Megger, the insulation resistance must read >500 MΩ at room temperature. This ensures the MgO filler is completely dry and free of contaminants.
Hydrostatic Pressure Testing: The entire heating element (including welds and the sheath) is subjected to 1.5x the maximum operating pressure using water or oil. The unit is held at this pressure for a specified duration to detect any micro-leaks that are invisible to the naked eye.
Visual & Dimensional Audit: Final inspection of weld quality, spiral pitch accuracy, and flange dimensions to ensure perfect fitment.

Primary Applications

Water Treatment: Heating in clarifiers, filter backwash systems, and small potable water storage.
Chemical Dosing Systems: Maintaining the viscosity of chemicals in day tanks.
Food Processing: Heating syrups, brines, and clean-in-place (CIP) solutions where hygiene and easy cleaning are mandatory.
General Industry: Space heaters for hydraulic reservoirs and small oil sumps.