Heat Tracing Heating Element Of Electric Heater

High Efficiency of Electrothermal Conversion MI Cable Heating Element is more and more used for the heater designing and manufacturing especially on strict working condition required applications.  Using the principle of the thermal effect of current (Joule-Lenz law), the pure resistance heats up, converting almost 100% electric energy into heat energy.

 

The element is to be designed based on selection of mineral insulated heating cable which is prefabricated in the manufacturer's workshop into a heating element that can be directly connected to the power supply. It is usually composed of heating cables, cold and hot joints, cold end cables, terminals, tail ends and lead wires, etc. There are the following types can be selected from including type A, Type B, Type C, Type D, Type E, Type F and Type G structures. Among them, Type A, B and C are only suitable for single-core heating cable, while type D, E, F and G are only suitable for double-core heating cable.

 

It can be widely used on heating or heat tracing of process conveying pipes and accessories, pumps, reactor, cracking furnace, carburetor, flash evaporator, storage tank, storage tank, other devices and vessels etc.

 

 

Common structure of the heating cable for the heating element is of single core and two core, while the customization can be according to clients’ needs to design and provide MI heating cable of three core or more.

Advantages:

 

1. High mechanical strength

Adopting high strength metal tube as sheath, a compact body is formed with conductor and mineral insulating powder during special processing. It has strong structure, high mechanical strength, and is resistant to mechanical extrusion and bending.

2. Stable physical and chemical properties

It is composed of inorganic materials and metal with good thermal stability, which is very stable in mechanical, physical and chemical properties such as structure, electrical conductivity, dielectric strength and chemical components when used at rated temperature and set environment.

3. Small temperature difference between inside and outside

The thermal resistance coefficient of magnesium oxide insulation is 3-5 times smaller than that of most organic insulating materials. The lower thermal resistance enables the rapider transfer of heat from the inner conductor to the metal jacket, so that the temperature difference between the conductor and the jacket surface is less, allowing for a greater current density.

4. High efficiency of electrothermal conversion

Using the principle of the thermal effect of current (Joule-Lenz law), the pure resistance heats up, converting almost 100% electric energy into heat energy.

5. Convenient electrical control

The working voltage is with power frequency 50-60Hz, and ON/OFF or PID temperature control is selected according to actual needs. The technology is mature, the operation is reliable, and the maintenance is limited.

6. Corrosion resistant

According to use environment temperature and corrosive medium, the appropriate metal sheath material can be chosen, the best corrosion resistance can be achieved.

7. Resistance to radiation

The inorganic materials used have good radiation resistance. Literature shows that when the cable is operated at 200℃ to 700℃ and the neutron flux is 1021 neutron /cm2, its technical performance does not change, and it can be applied to the core radiation area of nuclear power plants.

8. Explosion-proof certificate

The CML IEC Ex and ATEX explosion-proof certificates have granted for the mineral insulated heating cable products

 

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Application

Copper sheathed heating cable (MICU)	Maximum output power(W/m)
Freezing Prevention for metal gutters and downpipes	49
Freezing Prevention for non-metal gutters and downpipes	16
Vessel and piping process temperature maintaining	59
Freezing Prevention for metal containers and pipes	59
Metal roof snow-melting	49
High-density polyethylene outer sheathed copper sheathed heating cable (MIHC)
Freezing Prevention for metal containers and pipes	26
Freezing Prevention non-metallic containers and pipes	13
Snow melting on asphalt slopes	82
Non-metallic roof ice or snow melting	26
Freezing Prevention for metal gutters and downpipes	26
Freezing Prevention for non - metallic gutters and downpipes	16
Concrete floor heating	33
Rising or defrosting prevention for cold storage ground	23
Freezing Prevention for metal containers and pipes	99

 

Note: when heating cables are used for heat tracing of vessels and pipes, the maximum output power must be controlled to ensure that the sheath temperature does not exceed its maximum allowable temperature or the spontaneous combustion temperature of the area (for hazardous areas).

 

Table 2 Heating Cable Specification (600V Single Conductor)

Cable Code	Diameter	HDPE Diameter	Standard resistance value at +20℃	Maximum Production Length	Unit weight
	mm	mm	Ω/m	m	kg/km
16C1.7	8.2	10	0.0017	350	366.54
16C2.2	7.6	9.4	0.0022	380	307.77
16C2.9	7.0	8.8	0.0029	400	264.45
16C4	5.9	7.7	0.004	600	190.88
16C7	5.3	7.1	0.007	600	154.08
16C11	4.9	6.7	0.011	600	132.25
16C13	4.6	6.4	0.013	600 (300)☆	125.7
16C17	4.6	6.4	0.017	600 (300)☆	117.16
16C21	4.6	6.4	0.021	600 (300)☆	111.9
16C25	3.7	5.5	0.025	600 (480)☆	68.83
16C33	3.7	5.5	0.033	600 (480)☆	63.76
16C40	3.4	5.2	0.04	600 (560)☆	58.87
16C63	3.2	5	0.063	600	51.47
16K80	6.8	8.6	0.08	370 (140)☆	254.18
16K100	5.2	7	0.1	450 (240)☆	162.11
16K140	4.9	6.7	0.14	600 (270)☆	122.55
16K197	4.45	6.25	0.197	600 (330)☆	111.32
16K220	4.5	6.3	0.22	600 (330)☆	102.89
16K315	4.3	6.1	0.315	600 (350)☆	91.44
16K345	4.2	6.0	0.345	600 (370)☆	85.9
16K450	4.0	5.8	0.45	600 (400)☆	80.73
16K630	4.0	5.8	0.63	600 (400)☆	77.26
16K800	3.5	5.3	0.8	600 (530)☆	61.48
16K1250	2.8	4.6	1.25	600	40.83
16K2000	2.8	4.6	2.0	600	38.96

 

 

Table 3 Heating Cable Specification (600V Double Cores)

 

Cable Code	Diameter	Nominal resistance at +20℃	Maximum manufacturing length	Unit weight
	mm	Ω/m	m	kg/km
26C3.4	12.9	0.0034	150	783.76
26C4.4	12.2	0.0044	160	701.56
26C5.8	11.3	0.0058	170	606.16
26C8.6	9.90	0.0086	180	451.43
26C11.4	9.30	0.0114	200	400.05
26C13.8	9.00	0.0138	210	375.20
26C17.2	8.60	0.0172	220	344.90
26C23	8.00	0.023	250	303.25
26C34.4	7.50	0.0344	280	269.20
26C49.2	7.10	0.0492	300	243.84
26K240	9.90	0.24	180	451.43
26K320	9.30	0.32	200	400.05
26K384	9.00	0.384	210	375.20
26K480	8.60	0.48	220	344.90
26K640	8.00	0.64	250	303.25
26K960	7.50	0.96	280	269.20

 

 

Table 4 Heating Cable Specification (300V Double Cores)

 

Cable Code	Diameter	Nominal resistance at +20℃	Maximum manufacturing length	Unit weight
	mm	Ω/m	m	kg/km
23C3.4	12.0	0.0034	200	708.10
23C4.4	11.3	0.0044	220	629.07
23C5.8	10.4	0.0058	240	537.73
23C8.6	9.00	0.0086	260	392.56
23C11.4	8.40	0.0114	280	343.89
23C13.8	8.00	0.0138	300	314.57
23C17.2	7.60	0.0172	320	286.27
23C23	7.10	0.023	340	252.98
23C34.4	6.60	0.0344	360	221.19
23C49.2	6.20	0.0492	380	197.64
23K160	10.4	0.16	220	508.37
23K240	9.00	0.24	240	392.56
23K320	8.40	0.32	265	343.89
23K384	8.00	0.384	280	314.57
23K480	7.70	0.48	300	291.91
23K640	7.10	0.64	320	252.98
23K960	6.50	0.96	350	216.11

Note: the resistance value of 2-core cable in the above table is the measured value after the ends are twisted (i.e., single-core resistance X2);

For the use of 660V voltage occasions, please contact our company professionals;

Mark of (300)☆ is a recommended production length by MICH

 

Table 5 terminal specifications

 

	Model: A, D, E		Model: B
Maximum Voltage(V)	Maximum Current (A)	Terminal Specification	Maximum Voltage(V)	Maximum Current (A)	Terminal Specification	Maximum Voltage(V)
600	15	E2	20	E1	15	E1
600	20	E2	25	E2	20	E1
600	30	E3	40	E2	30	E2
600	50	E3	70	E2	50	E2
600	70	E3	100	E3	70	E2

 

Note 1: E1 means 1/2 "NPT;E2 means 3/4 "NPT;E3 represents 1 "NPT (taper thread);Additional connection thread requirements are available.

Note 2: the length of cold end cable with standard configuration is 2 meters. If you increase or decrease of length required, please contact our professional personnel.