Screw Plug Immersion Heaters Selection Guidelines

IMMERSION - Screw Plug Immersion Heaters

Selecting a Screw Plug Heater

The selection of the proper screw plug immersion heater requires critical engineering judgement. After determining the heat requirement (see the Technical section of this catalog), the proper selection of the screw plug material, heating element sheath material and correct watt density is critical for long life of the heater. The following table may be used as a guide to this selection, along with the Technical Information at the back of this catalog. Ultimate choice is determined by the knowledge of the process and engineering acumen of the plant engineer.

Application Factors

Heater application is influenced by the following parameters.

The heated media, viscosity, specific heat, density and corrosive properties.
Contaminants or pH present in the media.
The corrosion resistant properties of heater sheath material.
Watt density of the heating element—the heat output per square inch.
Screw plug material.

Typical Applications

See screw plug immersion heater selection guide below for your application.

Hot Water Storage Tanks
Warming Equipment
Preheating all Grades of Oil
Food Processing Equipment
Cleaning and Rinsing Tanks
Heat Transfer Systems
Process Air Equipment
Boiler Equipment
Freeze Protection of Any Fluid

Screw Plug Immersion Heaters — Selection Guidelines

Note — Liquid level controls are suggested for all immersion heating applications. See Controls section in this catalog.

Application Guideline- Screw Plug Immersion Heaterss

Application	Screw Plug Size (In.)	Sheath Material	Screw Plug Material	HEater Model	Integral Thermostat	Page
Clean Water	1	Copper	Brass	ARTM	Yes	B-7
	1-1/4	Copper	Brass	MT-1	No	B-10
	2	Copper	Brass	EMT-3	No	B-15
	2	Copper	Brass	ARMT-2	Yes	B-11
	2	Copper	Brass	MT-2	No	B-13
	2	INCOLOY®	Brass	CH-SD	No	B-16
	2-1/2	Copper	Brass	ARMT-3	Yes	B-17
	2-1/2	Copper	Brass	MT-3	No	B-21
Process Water	1	SS	SS	ARTMS	Yes	B-23
	2	SS	SS	ARMTS-2	Yes	B-27
	2	SS	SS	MTS-2	No	B-29
	2	SS	SS	AREMTS-3	Yes	B-31
	2	SS	SS	EMTS-3	No	B-32
	2-1/2	SS	SS	ARMTS-3	Yes	B-34
	2-1/2	SS	SS	MTS-3	No	B-36
Solution Water	2	INCOLOY®	SS	ARMTI-2	Yes	B-38
	2	INCOLOY®	SS	MTI-2	No	B-40
	2	INCOLOY®	SS	AREMTI-3	Yes	B-41
	2	INCOLOY®	SS	EMTI-3	No	B-42
	2-1/2	INCOLOY®	SS	ARMTI-3	Yes	B-43
	2-1/2	INCOLOY®	SS	MTI-3	No	B-45
Corrosive Solutions	2	SS	SS	AREMTS-3	Yes	B-46
	2	SS	SS	EMTS-3	No	B-47
	2	INCOLOY®	SS	AREMTI-3	Yes	B-48
	2	INCOLOY®	SS	EMTI-3	No	B-49
Severely	2	SS	SS	AREMTS-3	Yes	B-50
Corrosive	2	SS	SS	EMTS-3	No	B-51
Solutions	2	INCOLOY®	SS	AREMTI-3	Yes	B-52
	2	INCOLOY®	SS	EMTI-3	No	B-53
Light Weight Oil	1	Steel	Steel	ARTMO-1	Yes	B-54
	1-1/4	Steel	Steel	MTO-1	No	B-57
	2	Steel	Steel	ARMTO-2	Yes	B-58
	2	Steel	Steel	MTO-2	No	B-60
	2	Steel	Steel	AREMTO-3	Yes	B-61
	2	Steel	Steel	EMTO-3	No	B-62
	2-1/2	Steel	Steel	ARMTO-3	Yes	B-63
	2-1/2	Steel	Steel	MTO-3	No	B-65
Medium Weight Oil	2	Steel	Steel	ARMTO-2	Yes	B-67
	2	Steel	Steel	MTO-2	No	B-68
	2	Steel	Steel	AREMTO-3	Yes	B-69
	2	Steel	Steel	EMTO-3	No	B-70
	2-1/2	Steel	Steel	ARMTO-3	Yes	B-71
	2-1/2	Steel	Steel	MTO-3	No	B-72
Heavy Weight Oil	2	Steel	Steel	ARMTO-2	Yes	B-73
	2	Steel	Steel	MTO-2	No	B-74
	2	Steel	Steel	AREMTO-3	Yes	B-73
	2	Steel	Steel	EMTO-3	No	B-74
	2-1/2	Steel	Steel	ARMTO-3	Yes	B-75
	2-1/2	Steel	Steel	MTO-3	No	B-75
Specialty Heaters—	1/2	INCOLOY®	Steel	RI	No	B-79
Water, Oil&	1/2	SS	Steel	RIO	No	B-79
Corrosive Fluids	1/2	INCOLOY®	Brass	RIN	No	B-80
	1/2	SS	Brass	RINO	No	B-80
	1/2	SS	SS	RIS	No	B-79
	3/4	INCOLOY®	Brass	RIN	No	B-80
	3/4	SS	Brass	RINO	No	B-80
	1	Copper	Brass	TMW-1	No	B-76
	1	Copper	Steel	TM-1	No	B-78
	1	SS	SS	TMWS-1	No	B-76
	1	Steel	Steel	TMO-1	No	B-78
	1-1/4	Copper	Brass	TMW-2	No	B-77
	2	INCOLOY®	Brass	DWH-MR	Yes	B-81
	2	INCOLOY®	Steel	MTO-LT	No	B-82
Note — SS denotes 304 Stainless Steel.

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