Immersion Heaters / Screw Plug

Industrial immersion heaters are medium capacity heating units designed to heat liquids, viscous fluids, forced air and gases inside tanks, vessels and pipes. Bucan screw plug electrical immersion heaters are designed to be immersed directly into the gas or liquid being heated; since these heaters come into direct contact with the gas or liquid, heat up times are very fast.

Immersion heaters manufactured at Bucan consist of a single or a set of tubular elements that are formed into hairpins and welded to a screw plug.

The sheath material of the heating elements could be

steel,
copper,
stainless steel or
Incoloy.

The standard screw plug sizes utilized are 1”, 1 1/4, 2” and 2 1/2” and are either made of steel, brass or stainless steel, depending on the application. Various types of electrical protective enclosures, built-in thermostats, thermocouples and high-limit switches can be incorporated into screw plug immersion heaters.

Immersion heaters may be used to to heat up flammable liquids or gases in industrial application. Contact us to inquire about our explosion proof housing units.

INDUSTRIAL APPLICATIONS FOR SCREW PLUG IMMERSION HEATERS:

PROCESS WATER HEATING
HEATING OILS, WAX, TAR, ASPHALT, PARAFFIN
MILD ALKALINE & ACID SOLUTIONS
FREEZE PROTECTION
EQUIPMENT WARM-UP
HEATING GASES
FOOD PROCESSING

WATT DENSITY AND SHEATH MATERIAL SELECTION TABLE:

Screw Plug NPT	Plug Material	Standard Element Diameter	Max Voltage	Phase	Heating Elements Material	Maximum Number of Elements
1	BRASS	0.315	300 V	1	COPPER	1
1 1/4	STEEL	0.315	300 V	1	INCOLOY 800	2
2	SS 304	0.430	600 V	1 or 3	SS 304	3
2 1/2	SS 316	0.430	600 V	1 or 3	SS 316	3

OPTIONAL FEATURES

Nema 4 (moisture proof) terminal box
Built-in Thermowell
Built-in single or double pole thermostats
Passivation for stainless steel and Incoloy heaters
Built-in process or high limit T/C
Special plugs or non-standard thread sizes
Nema 7 (explosion proof) Terminal Box, please consult the factory

MAXIMUM TEMPERATURE AND SHEATH MATERIAL SELECTION TABLE:

Heater Sheath	Maximum Sheath Temp.	Used to heat
steel	750°F (400°C)	oil, hydraulic oil
copper	360°F (180°C)	water, tap/municipal only
Incoloy 800®	1500°F (815°C)	water, alkaline solutions, air, gases, radiant
Incoloy 840®	1400°F (760°C)	air, radiant
Inconel 600®	1600°F (870°C)	strong alkaline solutions, high temperature gases
stainless steel	1200°F (650°C)	De-ionized, de-mineralized, process water, some mild acids