Flanged Immersion Heaters

Applications of Immersion Heaters

• HOT WATER TANKS
• BOILER HEATERS
• ASPHALT, PARAFFIN, WAX HEATERS
• OIL PRODUCT HEATERS
• CORROSIVE AND NON-CORROSIVE SOLUTIONS
• AIR AND GAS HEATERS
• HEAT TRANSFER EQUIPMENT
• VAPOR DEGREASERS

Selection of Immersion Heaters

Flanged immersion heaters can be used in different applications. In order to meet the heating requirements of a specific application and have a safe operation in the environment within which a heater operates several factors should be taken into consideration in the design of flanged immersion heaters. The following are a number of criteria that should be considered:

• The pressure rating and the material of a flange.
• The sheath material of the tubular elements. Table 2 provides recommended tubular element sheathe and flange materials for different mediums.
• Operating temperature and a watt density of tubular elements that are adequate to the material heated. Table 2 provides maximum operating temperatures and watt densities that are recommended for heating various materials.
• Design watt density, flow velocity, outlet temperature are factors that contribute to the temperature level that tubular elements will attain. The table below shows the maximum temperatures that different sheath materials could be subjected to:

• Safety issues considering the environment within which the immersion heater will operate.
• Utilization of adequate temperature controlling devices, temperature and pressure high limit switches, low liquid level and flow controllers and other control/safety devices that will control the heating process and protect the heater from excessive heat.
• The classification of the electrical terminal box required (NEMA1, NEMA4, NEMA7, NEMA12 etc…).
• The level of the contamination that the immersion heater will be exposed to
• Safety and electrical code consideration
• The possible requirement of baffles that force a gas or a liquid to circulate around heating elements when flanged immersion heaters are used inside circulation tanks.

For more information in selecting Flanged immersion heaters please contact Bucan.

Features of Immersion Heaters

• NEMA 4 TERMINAL BOX
• NEMA 7 TERMINAL BOX
• 300 LB RATED FLANGES
• STAINLESS STEEL FLANGES
• SPECIAL TERMINAL BOX (STILTED, VENTED, STAINLESS STEEL, ETC…)
• BUILT-IN THERMOCOUPLES
• PASSIVATION
• BAFFLES
• THERMOSTATS WITH VARIOUS TEMPERATURE RANGES
• HIGH LIMIT TEMPERATURE DEVICES

THERMOSTATS AND THERMOCOUPLES

The thermostats used in flanged immersion heaters are the bulb and capillary style. The standard thermostat has 25A max capacity and could operate up to 240V. This thermostat is single pole/single throw style with a temperature range of 10-120ºC. The table below shows other ranges of thermostats that are available.

It should be noted that thermostats are only temperature controllers and should not be used as fail-safe high limit switches.

Built-in thermocouples could be used inside flanged immersion heaters to give more accurate temperature indications. Thermocouples could also be attached to one of the heating elements and used as high-temperature limiting devices.