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The document of electric heating
The heat insulating material thickness for different tube Dia under various Temp.
Material:Rock cotton
Surface wrappage:Aluminium or carbon steel     
Humidity:81%     
Ambient Temp.:15.4
℃     
Wind speed:3.8m/s
Tube Dia
Tube Temp(℃)
 in/Dg mm /mm
25
50
75
100
125
150
175
200
225
250
275
300
325
350
375
400
425
450
 1/2″/15/21.34
25
30
30
30
40
50
50
50
60
60
60
80
80
80
80
80
80
80
 3/4″/20/26.67
25
30
30
40
40
50
50
60
60
60
70
80
80
80
80
80
80
80
 1″/25/33.40
25
30
40
40
40
50
60
60
60
70
70
80
80
80
80
80
80
80
 1/2″/40/48.26
25
30
40
40
50
50
60
60
70
70
70
90
90
90
90
90
90
90
 2″/50/60.33
30
40
40
50
50
60
60
70
70
70
70
90
90
100
100
100
120
120
 3″/80/88.90
30
40
40
50
50
60
70
70
70
80
80
90
110
110
120
130
130
150
 4″/100/11403
30
40
50
50
50
60
70
80
80
90
90
100
100
110
120
130
130
160
 6″/150/168.3
30
40
50
60
70
70
80
80
100
100
100
110
130
130
130
130
160
160
 8″/200/219.1
40
50
50
60
70
80
80
90
100
100
100
110
130
130
130
150
170
180
 10″/250/273.1
40
50
60
60
70
80
80
100
100
100
120
120
140
140
170
170
180
190
 12″/300/323.9
40
50
60
60
70
80
80
100
100
100
120
140
140
170
170
180
190
200
 14″/350/355.6
40
60
60
60
70
80
80
100
100
100
140
140
170
170
180
190
200
200
 16″/400/406.4
40
60
60
80
80
80
90
100
100
100
140
150
170
180
180
190
200
210
 18″/450/457.2
40
60
60
80
80
90
90
100
100
110
150
160
170
180
180
190
22
210
 20″/500/508.0
60
60
60
80
90
90
100
100
100
120
160
160
180
190
200
210
220
220
 24″/600/609.60
60
60
60
80
90
90
100
100
100
120
170
170
190
200
200
210
220
220
 26″/650/660.40
60
60
60
100
100
90
100
130
130
140
200
200
200
200
200
210
220
220
 28″/700/711.20
60
60
70
100
100
90
110
130
130
140
200
200
200
200
200
210
220
220
 30″/750/762.0
60
60
70
100
100
100
110
130
130
170
200
200
200
200
200
210
220
280
 36″/900/914040
70
70
90
100
100
100
110
160
170
180
200
200
200
200
200
210
220
280
 40″/1000/1016.0
70
70
90
100
100
100
110
170
180
190
200
200
200
200
200
280
280
290
 42″/1050/1066.80
70
70
90
100
100
100
110
170
180
190
200
200
200
200
280
280
290
300
 48″/1200/1219.20
70
70
90
100
100
100
110
170
190
190
200
200
200
200
290
300
300
300
 54″/1350/1371.60
70
70
100
100
100
100
150
180
190
190
200
200
200
280
300
300
300
300
 60″/1500/1524.00
70
70
100
100
100
100
160
180
200
200
200
200
280
280
300
300
300
300
 66″/1650/1676.80
70
70
100
100
100
100
170
190
200
200
200
200
280
300
300
300
300
300
 72″/1800/1828.80
70
80
100
100
100
100
170
190
200
200
200
200
280
300
300
300
300
300
 Store pot
70
100
100
100
100
180
200
200
200
300
300
300
300
300
300
300
400
400
Above data only for reference

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