Standard and customized electric heat exchangers - NAVAL SECTOR (MARINE DIVISION) SECTOR

Electric exchangers with relative storage tanks for sanitary water systems are used in the Naval Sector (Marine Division).

These components studied and designed in collaboration with our customers, are the result of Reart’s 40 years of experience in the sector.

All systems in this sector are customized according to customer specifications and needs.

For other applications in the Naval Sector (Marine Division) sector, for what regards support vessels for underwater operations, electric heat exchangers are used to imoprove the working conditions of divers operating at very deep depths.

General characteristics of Electric Exchangers.

Reart has been producing heat exchangers for heating liquids and gases of all kinds for over 40 years. Electric exchangers are the optimal solution for heating process fluids in forced convection, with the heating elements in direct contact with the fluid to be heated.

Thanks to their characteristics, it is possible to create very compact electric exchangers with a precise control and adjustment of the temperature of the fluid.

Our technical department can be design the exchangers for the following types of fluids:

  • Thermal oil and fuels
  • Hydrocarbons
  • Industrial, fresh and demineralised water
  • Sea water
  • Natural gas, technical and process gases
  • Air or Nitrogen

The electrical power installed on the electric exchangers can vary up to thousands of kW according to specific customer requests.

The electric exchanger consists of an electric heating bundle with several resistive elements connected to each other and welded on a tank, coupling flange and inserted inside a tube (exchanger shell). The exchanger is sized and designed according to the project data (temperature and pressure) in compliance with regulations according to the country of destination: VSR, PED, ASME, U-STAMP, TEMA, ADMERKBLATTER, STOOMWEZEN.

The tank and the heater are sized (materials and dimensions) by the technical office based on the operating conditions indicated in the customer’s specifications by means of a thermodynamic and mechanical calculation software.

Different materials are applied to the part under pressure (tank and coupling flanges) and to the heater, depending on the operating conditions:

  • Carbon and/or low alloy steel for low temperature conditions and non corrosive fluids.
  • Stainless steel for aggressive fluids and high temperatures (Aisi 304 – 316L).
  • Titanium for marine and offshore applications.

For the heating elements (electric heating beam) the following can be used:

  • Austenitic materials such as AISI 321 for corrosive fluids and high temperatures.
  • Austenitic materials such as AISI 316L for corrosive fluids and low temperatures.
  • Noble alloys such as incoloy 800 for high temperature systems.
  • Titanium for marine and offshore installations for salt water use.

Depending on the maximum operating temperature of the system, the electrical enclosure of the heater connections can be in direct contact with the heater flange or in the “cold head” execution.

The protection rating can be IP55, IP65 or IP66 with relative sealing gasket. The manufacture materials can be in carbon steel, painted with aluminium zinc paint, or otherwise in Aisi 304 stainless steel.

The electric exchangers are sized by the technical office, with the aid of software for thermodynamic sizing, thanks to which it is possible to obtain the real operating conditions, based on the needs and specifications of the customer, to create flows at a controlled temperature.

Thanks to the use of this software, it is possible to define the main parameters including:

  • Electric power needed
  • Process side pressure drops
  • Surface load or specific power
  • Maximum surface temperature of the heating element
  • Fluid flow rate inside the tank
  • Dimensions of the electric exchanger
  • Building materials
  • Conditions of the exchanger during normal expected operating conditions.

The exchanger can be supplied together with the relative insulation supports, the exchanger lifting eyebolts, the tank support saddles for mechanical fixing of the exchanger, the process control instrumentation (sensors thermals), and any connections to the tank (venting and drain).                                                     

Reart manufactures process skids and supplies the turnkey package by supplying, in addition to the electric exchanger, the relative electrical command and control panel of the exchanger.                       

The experience Reart in many years of presence on the market in various sectors, allows to give its customers the most suitable technical solutions for the type of application required.

Reart is able to provide the following services to support the products supplied:

  • Commissioning & start-up assistance at the customer’s premises
  • Commissioning at the customer
  • Maintenance assistance of existing plants supplied.
  • Spare parts on supplied products.

For electric exchangers, the following documentation is provided in the final certification file accompanying the product:

  • Declaration of conformity
  • Use and maintenance manual
  • Exchanger assembly drawings
  • Technical data sheets of the components used and relative declarations of conformity of the suppliers
  • Internal test Report.

Customized solutions are also provided on request and customer specifications.