6X Heat Tracing On Pipe Liquefied Natural Gas Storage Plant

Liquefied Natural Gas Storage Plant Mineral Insulated Cable for Heating and Heat Trace is a specially developed heating and heat trace system for the LNG plant.  For the natural gas storage, the first step is to liquify the gas into LNG. Therefore, the gas must be cooled down to -160 °C. LNG occupies only 1/600th of the volume of natural gas of the same weight. So liquifying is an economic option for storage and transport.

 

Because of the -160 °C inside the storage tank, frost can occur around and under the tank and in the foundation of the plant, causing frost heave cracking. This can pose a serious risk to safe operation. An electrical heat tracing system prevents this by keeping the structure‘s at 5 °C.

 

The pipeline network of the LNG plant with all drums and pumps is heated to +10° C for freeze protection. Also, process temperatures between 15 °C and 140 °C are maintained to ensure that the gas liquefaction process runs smoothly and safely.

 

Heat Trace Mineral Insulated Heating Cable for Vessels and Tanks can meet the needs of high temperature condition and heat tracing of long-distance transportation pipeline. The maximum withstand temperature of the copper sheathed heating cable (MICU) provided by MICH can reach up to 250℃. Conductor resistance value ranges from 1.7-2000Ω/km. For the occasion of anti-corrosion or buried application, high density polyethylene (HDPE) outer sheath ( cable known as MIHC) is needed to be added. MIHC’s withstanding maximum temperature can be up to 90℃. Mineral insulated heating cable possesses excellent mechanical strength. The heating cable of series resistance provided by MICH can meet the requirements of different power levels.

 

 

Cable Structure

 

 

Specification

Heating cable instruction code

 

 

MI CU-B 16K320/60/2520/220/E1

No. 1 2 3 4 5 6 7

 

No.	Instruction
1	Sheath material	CU
2	structure of cable components	shown in table 1
3	cable codes	shown in table 2, 3 and 4
4	length of heating cable	In meter
5	Heating cable power	In Watt
6	heating cable voltage	In Volt
7	heating cable voltage	See table 5

 

 

 

 

 

 

 

 

 

 

Cable Code

 

1 6 K 320

No. 1 2 3 4

 

Serial NO.	Instruction
1	core number	1 or 2
2	Voltage grade	3=300V, 6=600V
3	conductor materials	C,K
4	cold resistance ×1000	320=0.32Ω/m×1000

 

 

 

 

 

 

 

Table 1 Structure of Cable Element

 

 

Note: Model C, F and G are suitable for being used at temperature under 65℃

 

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 Conductors)

 

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.

 

Corresponding reference table between the output power and sheath temperature

 

 

Note: when applying a copper conductor heating cable, please pay attention to the conversion of its heated hot resistance and unheated cold resistance.