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Electric heating trace designing
Tube heat loss q（the heat loss of tube per meter changing1℃) see the uppertable on page 4 ）

管徑
Heat Insalution Thickness(mm/in)
G″
DN
10
20
25
35
50
60
75
100
1/2
3/4
1
1-1/2
2
2-1/2
3
4
1/2
15
8.86
6.73
5.74
4.59
3.94
3.61
3.28
2.95
3/4
20
10.34
7.87
6.56
5.09
4.43
3.94
3.61
3.28
1
25
12.31
9.02
7.55
5.91
4.92
4.43
4.10
3.61
1-1/4
32
14.77
10.83
8.70
6.73
5.58
4.92
4.59
3.94
1-1/2
40
17.06
12.30
10.01
7.55
6.23
5.58
4.92
4.27
2
50
19.69
14.11
11.32
8.53
7.05
6.07
5.42
4.76
2-1/2
65
23.13
16.57
13.13
9.68
7.88
6.89
6.07
5.25
3
80
27.56
19.36
15.26
11.16
9.03
7.88
6.89
5.74
3-1/2
95
31.01
21.82
17.06
12.31
10.01
8.53
7.55
6.23
4
100
34.45
24.12
18.87
13.62
10.83
9.19
8.21
6.73
4-1/2
115
37.90
26.41
20.51
14.77
11.81
10.01
8.86
7.22
5
130
41.83
29.04
22.48
16.08
12.80
10.83
9.52
7.71
6
150
49.22
33.96
26.25
18.54
14.60
12.30
10.66
8.70
8
200
63.16
43.15
33.14
23.13
18.21
15.09
13.13
10.66
10
250
77.76
52.99
40.52
28.05
21.82
18.05
15.59
12.47
12
300
91.70
62.18
47.58
32.81
25.43
21.00
17.88
14.27
14
350
100.40
68.08
51.84
35.60
27.56
23.46
19.36
15.26
16
400
114.2
77.27
58.73
40.36
31.01
25.43
21.82
17.06
18
450
128.1
86.46
65.79
44.95
34.45
28.22
24.12
18.87
20
500
141.9
95.81
72.68
49.55
37.90
31.01
26.41
20.51
24
600
169.6
114.2
86.46
58.73
44.95
37.08
31.01
24.12
　Heat Loss of store tank surface q (heat loss of per sqm changing 1℃)
Store tank
74.8
49.7
37.7
25.1
18.6
14.9
12.6
9.3
　Heat loss for surface is base on the 10% of designing margin ，Heating Quotiety 0.25

?? 1 2 3 4 5 ??

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