Marine Calorifier

DRG Series Marine Electric Heating Calorifier

The DRG Series Marine Electric Heating Calorifier represents the pinnacle of marine water heating technology—a top-tier, high-efficiency system meticulously crafted for ships, offshore platforms, and specialized marine vessels. This advanced hot water tank system is dedicated to delivering a consistent, reliable supply of heated fresh water for multiple essential purposes, including providing warm water for crew accommodations, facilitating efficient galley services, and ensuring proper sanitation facilities throughout the vessel.

Constructed with robust marine-grade materials and featuring intelligent temperature control, our electric calorifier not only guarantees a steady hot water flow but also strictly adheres to the most rigorous international marine safety standards. With its energy-saving design and low-maintenance requirements, the DRG Series is the perfect choice for vessel operators seeking dependable, efficient, and long-lasting water heating solutions for their marine operations.

Uncompromising Quality: 316L Stainless Steel & CCS-B Certified Construction

The DRG Series is equipped with 316L stainless steel valves and components certified by CCS-B, ensuring exceptional resistance to corrosion in the harsh marine environment. This premium material selection, combined with a robust base frame constructed from CCS-B marine-grade steel, guarantees long-term durability and system integrity, even under constant exposure to saltwater, humidity, and vibration.

Intelligent Control for Optimal Performance and Safety

At the heart of the DRG Series is a sophisticated control system featuring dual WTZK-50-C temperature controllers that automatically regulate water temperature within the precise range of 50°C – 65°C. This intelligent temperature management provides comfortable hot water while preventing overheating and energy waste. Comprehensive safety protection is ensured through:

• Float Level Switch: Prevents dry heating by cutting power when water level is low.

• Safety Valve: Protects against overpressure situations.

• Thermal Overload Protection: Safeguards heating elements from excessive temperatures.

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Key Features & Benefits

• ✅ Marine-Grade Robust Construction: Features 316L stainless steel valves and CCS-B certified components, providing exceptional corrosion resistance and long-term durability in the harshest marine environments.

• ✅ Intelligent Temperature Control System: Dual WTZK-50-C controllers automatically regulate water temperature within 50°C – 65°C, ensuring comfortable hot water while optimizing energy consumption.

• ✅ Comprehensive Safety Protection:

  • Float Level Switch: Prevents dry heating damage to elements.

  • Safety Valve: Protects against overpressure situations.

  • Thermal Protection: Safeguards against overheating.

• ✅ Energy-Efficient Segmented Heating Operation: Advanced segmented heating technology reduces power consumption, particularly in large-capacity models, by using sequential heating to distribute the electrical load evenly and improve overall efficiency.

• ✅ Multiple Capacity Options: Available in capacities from 0.12 m³ to 1.0 m³, catering to diverse vessel sizes—from small fishing boats to large offshore platforms.

• ✅ Dual Power Compatibility: Operates on either AC380V/50Hz/3φ or AC440V/60Hz/3φ power supplies, adaptable to global electrical systems and simplifying international vessel integration.

• ✅ Effective Thermal Insulation: Features 40mm insulation layer with 0.7mm galvanized steel outer shell, minimizing heat loss and improving overall energy efficiency.

• ✅ Flexible Control Modes: Offers both manual operation (for maintenance/testing) and automatic operation (for intelligent temperature-based control) with comprehensive safety overrides.

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Technical Specifications

Calorifier Performance Data

Pressure & Temperature Ratings

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System Components & Materials

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Connection Interfaces

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Piping System Configuration

• Cold Water Inlet: Connects to the freshwater pressure tank (pressure range 0.36 – 0.38 MPa), ensuring steady cold water supply to the calorifier.

• Hot Water Outlet: Supplies heated water to the vessel’s distribution system for various onboard applications.

• Return Interface: Connects to the hot water return line for circulation heating, improving system efficiency.

• Safety Valve Outlet: Discharges excess water to the bilge in overpressure situations, protecting the calorifier and vessel.

• Discharge Outlet: Connects to the bilge for complete tank drainage during maintenance or cleaning.

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Operating Principle & Control System

Automatic Temperature Management

• Heating Activation: Automatically commences when water temperature drops below 50°C, ensuring continuous hot water supply.

• Heating Deactivation: Automatically stops when temperature rises above 65°C, preventing overheating and energy wastage.

• Segmented Heating: For large-capacity models, sequential heating reduces power load on the electrical system, improving overall efficiency.

• Safety Interlock: Float switch prevents heating element operation when water level is low, avoiding dry heating damage.

Control Modes

• Manual Operation: Allows direct control for maintenance and testing purposes.

• Automatic Operation: Intelligent temperature-based control automatically adjusts heating according to set parameters.

• Safety Overrides: Multiple protection systems ensure safe operation, including over-temperature and over-pressure protection.

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Applications

The DRG Series Marine Electric Heating Calorifier is essential for providing domestic hot water on a wide range of vessels:

• Commercial Vessels: Cargo ships, container vessels, tankers, bulk carriers

• Offshore Platforms: Oil rigs, FPSOs, accommodation barges

• Passenger Vessels: Ferries, cruise ships, passenger vessels

• Naval Vessels: Frigates, destroyers, support ships

• Workboats & Tugs: Towing vessels, construction support craft

• Fishing Vessels: Small to large commercial fishing boats

• Yachts & Mega-Yachts: Luxury vessels requiring premium hot water systems

• Dredgers & Specialized Craft: Dredging vessels, cable layers, research ships

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Maintenance & Service Guide

Regular Maintenance

• Inspect heating elements regularly for scale buildup and clean as needed.

• Verify calibration and operation of temperature controllers.

• Check all safety devices (pressure relief valve, float switch) for proper function.

• Examine thermal insulation integrity and outer coating condition.

Periodic Service

• Clean and inspect tank interior to remove sediment and debris.

• Test heating element resistance (minimum 1MΩ).

• Maintain exterior anti-corrosion coating.

• Replace wear parts during scheduled dry docking.

Safety Precautions

• Never obstruct safety valve inlet with tape or sealants.

• Ensure capillary tubes are properly secured and protected.

• Maintain minimum 50mm bending radius for capillary tubes.

• Follow lockout/tagout procedures during maintenance.

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Frequently Asked Questions (FAQs)

Q1: Why is 316L stainless steel used for the valves and critical components?
A: 316L stainless steel is the preferred material for marine applications because it contains molybdenum, which provides superior resistance to chloride-induced corrosion (pitting and crevice corrosion) compared to 304 stainless steel. The “L” grade (low carbon) also offers improved weldability and resistance to intergranular corrosion. This ensures that valves and components exposed to seawater, humid air, and aggressive marine environments maintain their integrity and functionality for decades, preventing leaks and failures that could occur with lesser materials.

Q2: What is the advantage of dual WTZK-50-C temperature controllers?
A: The dual WTZK-50-C controllers provide redundancy and precision. Two independent controllers monitor and regulate the water temperature:

1. Redundancy: If one controller fails, the other continues to maintain safe operating temperatures, preventing overheating or system shutdown.

2. Precision Control: The dual-controller setup allows for more accurate temperature maintenance within the 50-65°C range, optimizing energy consumption and ensuring consistent hot water supply.

3. Safety: In the unlikely event of a controller malfunction, the dual system provides an additional layer of safety against overheating.

Q3: How does segmented heating improve energy efficiency?
A: Segmented heating divides the total heating power into multiple, independently controlled stages. For example, a 60kW unit might have four elements (2×12kW + 2×18kW). Instead of operating all elements simultaneously, the control system activates only the number of stages needed to maintain temperature based on current demand. This:

• Reduces peak power demand on the ship’s generator.

• Prevents temperature overshoot and energy waste.

• Allows precise matching of heating output to actual hot water usage.

• Extends element life by reducing thermal cycling.

Q4: What is the purpose of the float level switch in preventing dry heating?
A: The float level switch is a critical safety device that monitors the water level inside the tank. If the water level drops below the top of the heating elements (due to system drainage, leaks, or air ingress), the switch sends a signal to the control panel to immediately cut power to the heating elements. This prevents the elements from operating in air (dry heating) , which would cause them to overheat, burn out, and potentially create a fire hazard. It is an essential safety interlock for all electric water heaters.

Q5: How do I select the correct DRG model for my vessel?
A: Model selection depends on your vessel’s hot water demand:

• DRG-0.12 (12kW/180kg/h): Small vessels, workboats, fishing boats with 5-10 crew.

• DRG-0.2 (24kW/360kg/h): Medium vessels with 10-20 crew.

• DRG-0.3 (36kW/540kg/h): Larger vessels with 20-30 crew.

• DRG-0.5 (48kW/720kg/h): Vessels with 30-40 crew or higher demand.

• DRG-1.0 (60kW/900kg/h): Large vessels with 40-60+ crew, passenger vessels, or those with extensive galley/laundry facilities.
  Consider peak demand periods (e.g., morning showers) and recovery time when selecting. Our technical team can assist with detailed calculations.

Q6: What maintenance is required for the heating elements?
A: Heating elements require periodic inspection and maintenance:

• Scale Inspection: In areas with hard water, scale (calcium carbonate) can accumulate on elements, insulating them and reducing heating efficiency. Inspect annually and clean or replace as needed.

• Resistance Testing: Test insulation resistance (minimum 1MΩ) to ensure electrical integrity.

• Terminal Inspection: Check electrical connections for corrosion and tightness.

• Replacement: Elements typically last 5-10 years depending on water quality and operating conditions. Replace in sets to maintain balanced performance.

Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.

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