Thermal Insulation

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DETERMINATION OF INSULATION THICKNESS

1

INPUT DATA
AIR VELOCITY =

1.5

AMBIENT TEMPERATURE ( ta )

=

45

SURFACE TEMPERATURE OF THE INSULATING MATERIAL (tS) =

60

M/SEC
0

C

0

C

INSULATION CODE NO. 1

SELECTION OF INSLATION MATERIAL :

INSULATION CODE NO. 2
INSULATION CODE NO. 3
INSULATION CODE NO. 4
INSULATION CODE NO. 5

SURFACE EMITTANCE OF THE JACKET MATERIAL
=
0.075
(SURFACE EMITTANCE OF DIFFERENT MATERIALS ARE GIVEN IN Table-1)
TO SEE THIS TABLE click here.

INSULATION CODE 1 :

CALCIUM SILICATE (PRE-FORMED) TO IS-8154 (DENSITY 350 KG/CU. M , USABLE UPTO 650 DEG.C)

INSULATION CODE 2 :

UNBONDED ROCK & SLAG WOOL TO IS-3677 (DENSITY 150 KG/CU. M , USABLE UPTO 550 DEG.C)

INSULATION CODE 3 :

BONDED MINERAL WOOL MATTRESS TO IS-8183 GROUP 3
(DENSITY 80-120 KG/CU.M, USABLE UPTO 450 DEG.C)
PRE-FORMED FIBROUS ROCK, SLAG OR GLASS MINERAL WOOL TO IS-9842
GRADE 3 (DENSITY 121 TO 160 KG/CU.M,USABLE UPTO 450 DEG. C)
ROCKLLOYD SECTIONAL PIPE INSULATION (DENSITY 144 KG/CU. M , USABLE UPTO 450 DEG.C)

INSULATION CODE 4 :
INSULATION CODE 5 :

TABLE FOR INSULATION THICKNESS IN MM
BONDED MINERAL WOOL MATTRESS TO IS-8183 GROUP 3
PIPE NB->
PIPE O.D.
Tpipe,OC
65
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
510
520
530
540
550

15
21.336

20
26.67

25
33.4

32
42.164

40
48.26

50
60.325

65
73.025

80
88.9

100
114.3

<------------------------------------------------------------------------------------------------------------- INSULATION
25
25
25
25
25
25
25
25
25
25
25
40
40
40
40
40
40
40
40
50
50
50
50
50
60
60
60
60
65
65
65
75
75
75
75
75
80
80
90
90
90
90
100
100
100
100
100
120
120

25
25
25
25
25
25
25
25
25
25
40
40
40
40
40
40
40
40
50
50
50
50
60
60
60
60
60
65
65
75
75
75
75
75
80
80
90
90
90
90
100
100
100
100
100
120
120
120
120

25
25
25
25
25
25
25
25
25
25
40
40
40
40
40
40
40
50
50
50
50
60
60
60
60
60
65
65
75
75
75
75
80
80
90
90
90
90
100
100
100
100
100
120
120
120
120
120
120

25
25
25
25
25
25
25
25
25
40
40
40
40
40
40
40
50
50
50
50
60
60
60
60
65
65
75
75
75
75
80
80
90
90
90
90
100
100
100
100
120
120
120
120
120
120
120
120
125

25
25
25
25
25
25
25
25
25
40
40
40
40
40
40
50
50
50
50
60
60
60
60
65
65
75
75
75
75
80
80
90
90
90
90
100
100
100
100
120
120
120
120
120
120
120
120
125
125

25
25
25
25
25
25
25
25
25
40
40
40
40
40
40
50
50
50
60
60
60
60
65
65
75
75
75
75
80
80
90
90
90
90
100
100
100
120
120
120
120
120
120
120
120
125
140
140
140

25
25
25
25
25
25
25
25
40
40
40
40
40
40
50
50
50
50
60
60
60
65
65
75
75
75
75
80
80
90
90
90
100
100
100
100
120
120
120
120
120
120
120
125
140
140
140
140
140

25
25
25
25
25
25
25
25
40
40
40
40
40
50
50
50
50
60
60
60
60
65
75
75
75
75
80
90
90
90
90
100
100
100
120
120
120
120
120
120
120
125
125
140
140
140
140
150
150

25
25
25
25
25
25
25
25
40
40
40
40
40
50
50
50
60
60
60
60
65
75
75
75
80
80
90
90
90
100
100
100
120
120
120
120
120
120
120
125
140
140
140
140
140
150
150
150
160

125
141.3

150
168.3

THICKNESS
25
25
25
25
25
25
25
25
40
40
40
40
50
50
50
50
60
60
60
65
75
75
75
80
80
90
90
90
100
100
100
120
120
120
120
120
120
125
125
140
140
140
140
150
150
150
160
160
160

200
219.1

250
273.1

300
323.9

350
355.6

400
406.4

450
457.2

500
508

550
558.8

600
609.6

650
660.4

700
711.2

750
762

800
812.8

850
863.6

900
914.4

950
965.2

1000
1016

25
25
25
25
25
25
25
40
40
40
40
50
50
50
60
60
65
75
75
75
80
90
90
90
100
100
120
120
120
120
120
125
140
140
140
150
150
160
160
160
175
175
175
180
200
200
200
200
225

25
25
25
25
25
25
25
40
40
40
40
50
50
50
60
60
65
75
75
75
80
90
90
100
100
100
120
120
120
120
125
140
140
140
140
150
150
160
160
175
175
175
180
200
200
200
200
200
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
60
65
75
75
75
80
90
90
100
100
120
120
120
120
120
125
140
140
140
150
150
160
160
160
175
175
175
180
200
200
200
200
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
60
65
75
75
80
80
90
90
100
100
120
120
120
120
120
125
140
140
140
150
150
160
160
175
175
175
180
200
200
200
200
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
60
65
75
75
80
90
90
90
100
100
120
120
120
120
125
140
140
140
140
150
150
160
160
175
175
175
180
200
200
200
200
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
60
65
75
75
80
90
90
90
100
100
120
120
120
120
125
140
140
140
150
150
160
160
175
175
175
175
180
200
200
200
200
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
60
65
75
75
80
90
90
90
100
100
120
120
120
120
125
140
140
140
150
150
160
160
175
175
175
180
200
200
200
200
225
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
60
65
75
75
80
90
90
100
100
100
120
120
120
120
125
140
140
140
150
150
160
160
175
175
175
180
200
200
200
200
225
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
60
65
75
75
80
90
90
100
100
120
120
120
120
120
125
140
140
140
150
150
160
160
175
175
175
180
200
200
200
225
225
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
65
65
75
75
80
90
90
100
100
120
120
120
120
120
125
140
140
140
150
150
160
160
175
175
180
200
200
200
200
225
225
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
65
65
75
75
80
90
90
100
100
120
120
120
120
125
140
140
140
150
150
160
160
175
175
175
180
200
200
200
200
225
225
225
225
225

25
25
25
25
25
25
25
40
40
40
40
50
50
60
60
65
65
75
75
80
90
90
100
100
120
120
120
120
125
140
140
140
150
150
160
160
175
175
175
180
200
200
200
200
225
225
225
225
250

--------------------------------------------------------------------------------------->

25
25
25
25
25
25
25
40
40
40
40
40
50
50
50
60
60
60
65
65
75
75
75
80
90
90
90
100
100
100
120
120
120
120
120
120
125
140
140
140
140
140
150
150
160
160
160
175
175

25
25
25
25
25
25
25
40
40
40
40
40
50
50
50
60
60
60
65
75
75
75
80
90
90
90
100
100
100
120
120
120
120
120
125
125
140
140
140
140
150
150
160
160
160
175
175
175
175

25
25
25
25
25
25
25
40
40
40
40
40
50
50
60
60
60
65
75
75
75
80
80
90
90
100
100
100
120
120
120
120
120
125
140
140
140
140
150
150
150
160
160
175
175
175
175
180
200

25
25
25
25
25
25
25
40
40
40
40
50
50
50
60
60
60
65
75
75
75
80
90
90
90
100
100
120
120
120
120
120
125
140
140
140
140
150
150
160
160
160
175
175
175
180
180
200
200

25
25
25
25
25
25
25
40
40
40
40
50
50
50
60
60
60
65
75
75
80
80
90
90
100
100
100
120
120
120
120
120
125
140
140
140
150
150
150
160
160
175
175
175
175
180
200
200
200

25
25
25
25
25
25
25
40
40
40
40
50
50
50
60
60
65
65
75
75
80
90
90
90
100
100
120
120
120
120
120
125
140
140
140
140
150
150
160
160
175
175
175
175
180
200
200
200
200

TABLE FOR HEAT LOSS THROUGH INSULATION
BONDED MINERAL WOOL MATTRESS TO IS-8183 GROUP 3
PIPE NB->
PIPE O.D.
Tpipe,OC
65
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500

15
20
25
32
40
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
650
21.336
26.67
33.4
42.164
48.26
60.325
73.025
88.9
114.3
141.3
168.3
219.1
273.1
323.9
355.6
406.4
457.2
508
558.8
609.6
660.4
<------------------------------------------------------------------------------------------------------------- HEAT LOSS THROUGH INSULATION PER METER LENGTH OF PIPE, W ------------------------------------------------------------------------------------------->
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
97.2148 119.837 143.885 166.508 180.625 203.247159
225.87
248.492363 271.115 293.738
316.36
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
97.2148 119.837 143.885 166.508 180.625 203.247159
225.87
248.492363 271.115 293.738
316.36
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
97.2148 119.837 143.885 166.508 180.625 203.247159
225.87
248.492363 271.115 293.738
316.36
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
97.2148 119.837 143.885 166.508 180.625 203.247159
225.87
248.492363 271.115 293.738
316.36
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
97.2148 119.837 143.885 166.508 180.625 203.247159
225.87
248.492363 271.115 293.738
316.36
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
97.2148 119.837 143.885 166.508 180.625 203.247159
225.87
248.492363 271.115 293.738
316.36
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
97.2148 119.837 143.885 166.508 180.625 203.247159
225.87
248.492363 271.115 293.738
316.36
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 54.7863 61.8559 73.1672
85.191
110.575 133.197 157.245 179.868 193.984 216.606963
239.23
261.852168 284.475 307.097
329.72
31.7678 34.1432 37.1403 41.0431 43.7578 49.1307 68.1461 75.2157
86.527
98.5508 110.575 133.197 157.245 179.868 193.984 216.606963
239.23
261.852168 284.475 307.097
329.72
31.7678 34.1432 37.1403 54.4029 57.1176 62.4905 68.1461 75.2157
86.527
98.5508 110.575 133.197 157.245 179.868 193.984 216.606963
239.23
261.852168 284.475 307.097
329.72
31.7678
47.503
50.5001 54.4029 57.1176 62.4905 68.1461 75.2157
86.527
98.5508 110.575 133.197 157.245 179.868 193.984 216.606963
239.23
261.852168 284.475 307.097
329.72
45.1276
47.503
50.5001 54.4029 57.1176 62.4905 68.1461 75.2157
86.527
98.5508 110.575 133.197 157.245 188.774 202.891 225.513499 248.136 270.758704 293.381 316.004 338.627
45.1276
47.503
50.5001 54.4029 57.1176 62.4905 68.1461 75.2157
86.527
107.457 119.481 142.104 166.151 188.774 202.891 225.513499 248.136 270.758704 293.381 316.004 338.627
45.1276
47.503
50.5001 54.4029 57.1176 62.4905 68.1461 84.1222 95.4335 107.457 119.481 142.104 166.151 188.774 202.891 225.513499 248.136 270.758704 302.288
324.91
347.533
45.1276
47.503
50.5001 54.4029 57.1176 62.4905 77.0527 84.1222 95.4335 107.457 119.481 142.104 175.058 197.681 211.797 234.420036 257.043
279.66524
302.288
324.91
347.533
45.1276
47.503
50.5001 54.4029 66.0242
71.397
77.0527 84.1222 95.4335 107.457 128.388
151.01
175.058 197.681 211.797 234.420036 257.043
279.66524
302.288
324.91
347.533
45.1276
47.503
50.5001 63.3094 66.0242
71.397
77.0527 84.1222
104.34
116.364 128.388
151.01
175.058 197.681 211.797 238.873304 261.496 284.118508 306.741 329.364 351.986
45.1276
47.503
59.4066 63.3094 66.0242
71.397
77.0527 93.0288
104.34
116.364 128.388
151.01
179.511 202.134 216.251 238.873304 270.402 293.025045 315.648
338.27
360.893
45.1276 56.4095 59.4066 63.3094 66.0242 80.3036 85.9592 93.0288
104.34
116.364 132.841 155.464 188.418
211.04
225.157
247.77984
270.402 293.025045 315.648
338.27
360.893
54.0342 56.4095 59.4066 63.3094 74.9307 80.3036 85.9592 93.0288
104.34
120.817 132.841
164.37
188.418
211.04
225.157
247.77984
270.402 293.025045 315.648 342.724 365.346
54.0342 56.4095 59.4066
72.216
74.9307 80.3036 85.9592 93.0288 108.793 129.724 141.748
164.37
188.418
211.04
229.611 252.233108 274.856 297.478313 320.101 342.724 374.253
54.0342 56.4095 68.3131
72.216
74.9307 80.3036 90.4125
97.482
117.7
129.724 141.748
164.37
192.871 215.494 229.611 261.139645 283.762 306.384849 329.007
351.63
374.253
54.0342 65.3161 68.3131
72.216
74.9307 84.7568 90.4125 106.389
117.7
129.724 141.748 168.823 192.871
224.4
238.517 261.139645 283.762 306.384849 329.007
351.63
374.253
54.0342 65.3161 68.3131
72.216
79.384
84.7568
99.319
106.389
117.7
134.177 146.201
177.73
201.778
224.4
238.517 261.139645 283.762 315.291385 337.914 360.537 383.159
62.9407 65.3161 68.3131 76.6692
79.384
93.6634
99.319
106.389 122.153 134.177 155.107
177.73
201.778
224.4
247.424 270.046181 292.669 315.291385 337.914 360.537 383.159
62.9407 65.3161 68.3131 76.6692 88.2905 93.6634
99.319
106.389 122.153 143.084 155.107
177.73
210.684 233.307 247.424 270.046181 292.669 315.291385 355.727
378.35
400.972
62.9407 65.3161 72.7664 85.5758 88.2905 93.6634
99.319
110.842
131.06
143.084 155.107 186.636 210.684 233.307 247.424 287.859254 310.482 333.104458 355.727
378.35
400.972
62.9407 69.7694 72.7664 85.5758 88.2905 93.6634 103.772 119.748
131.06
143.084 164.014 186.636 210.684
251.12
265.237 287.859254 310.482 333.104458 355.727
378.35
400.972
67.394
69.7694 81.6729 85.5758 88.2905 98.1166 103.772 119.748
131.06
151.99
164.014 186.636 228.497
251.12
265.237 287.859254 310.482 333.104458 355.727
378.35
400.972
67.394
78.6759 81.6729 85.5758 92.7438 98.1166 112.679 119.748 139.966
151.99
164.014
204.45
228.497
251.12
265.237 287.859254 310.482 333.104458 355.727
378.35
405.426
67.394
78.6759 81.6729 90.0291 92.7438 107.023 112.679 119.748 139.966
151.99
181.827
204.45
228.497
251.12
265.237 287.859254 310.482 337.557726
360.18
382.803 418.785
76.3005 78.6759 81.6729 90.0291
101.65
107.023 112.679 128.655 139.966 169.803 181.827
204.45
228.497
251.12
265.237 292.312522 314.935 350.917531
373.54
396.163 418.785
76.3005 78.6759 86.1262 98.9356
101.65
107.023 121.585 128.655 157.779 169.803 181.827
204.45
228.497 255.573
269.69
305.672326 328.295 350.917531
373.54
396.163 418.785
76.3005 78.6759 86.1262 98.9356
101.65
107.023 121.585 128.655 157.779 169.803 181.827
204.45
232.95
268.933
283.05
305.672326 328.295 350.917531
373.54
396.163 418.785
76.3005 83.1292 95.0327 98.9356
101.65
115.93
121.585 146.468 157.779 169.803 181.827 208.903
246.31
268.933
283.05
305.672326 328.295 350.917531 382.447 405.069 427.692
76.3005 83.1292 95.0327 98.9356 110.557
115.93
121.585 146.468 157.779 169.803 181.827 208.903
246.31
268.933
283.05
305.672326 337.201 359.824067 382.447 405.069 427.692
80.7538 92.0357 95.0327 107.842 110.557
115.93
139.398 146.468 157.779 169.803
186.28
222.263
246.31
268.933 291.956 314.578863 337.201 359.824067 391.353 413.976 436.598
80.7538 92.0357 95.0327 107.842 110.557 133.743 139.398 146.468 157.779 174.256
199.64
222.263
246.31
277.839 291.956 314.578863 346.108 368.730603 391.353 413.976 436.598
89.6603 92.0357 103.939 107.842 110.557 133.743 139.398 146.468 157.779 174.256
199.64
222.263 255.217 277.839 291.956 323.485399 346.108 368.730603 391.353 427.336 449.958
89.6603 92.0357 103.939 107.842
128.37
133.743 139.398 146.468 162.233 187.616
199.64
222.263 255.217 286.746 300.863 323.485399 346.108 382.090408 404.713 427.336 449.958
89.6603 100.942 103.939 125.655
128.37
133.743 139.398 146.468 175.592 187.616
199.64
231.169 255.217 286.746 300.863 336.845203 359.468 382.090408 404.713 427.336 449.958
89.6603 100.942 103.939 125.655
128.37
133.743 139.398 150.921 175.592 187.616
199.64
231.169 264.123 286.746 314.223 336.845203 359.468 382.090408 404.713 431.789 454.411
98.5669 100.942 103.939 125.655
128.37
133.743 139.398 150.921 175.592 187.616 208.547 240.076 264.123 300.106 314.223 336.845203 359.468 386.543676 409.166 449.602 472.225
98.5669 100.942 121.752 125.655
128.37
133.743 143.852 164.281 175.592 196.523 208.547 240.076 277.483 300.106 314.223 336.845203 363.921 404.356749 426.979 449.602 472.225

700
711.2

750
762

800
812.8

850
863.6

900
914.4

950
965.2

1000
1016

338.983
338.983
338.983
338.983
338.983
338.983
338.983
352.343
352.343
352.343
352.343
361.249
361.249
370.156
370.156
370.156
374.609
383.515
383.515
387.969
396.875
396.875
396.875
405.782
405.782
423.595
423.595
423.595
423.595
428.048
441.408
441.408
441.408
450.314
450.314
459.221
459.221
472.581
472.581
472.581
472.581
477.034
494.847
494.847

361.605
361.605
361.605
361.605
361.605
361.605
361.605
374.965
374.965
374.965
374.965
383.872
383.872
392.778
392.778
392.778
397.232
406.138
406.138
410.591
419.498
419.498
419.498
428.404
428.404
446.217
446.217
446.217
446.217
450.671
464.031
464.031
464.031
472.937
472.937
481.844
481.844
495.203
495.203
495.203
499.657
517.47
517.47
517.47

384.228
384.228
384.228
384.228
384.228
384.228
384.228
397.588
397.588
397.588
397.588
406.494
406.494
415.401
415.401
415.401
419.854
428.761
428.761
433.214
442.12
442.12
451.027
451.027
451.027
468.84
468.84
468.84
468.84
473.293
486.653
486.653
486.653
495.56
495.56
504.466
504.466
517.826
517.826
517.826
522.279
540.092
540.092
540.092

406.851
406.851
406.851
406.851
406.851
406.851
406.851
420.21
420.21
420.21
420.21
429.117
429.117
438.023
438.023
438.023
442.477
451.383
451.383
455.837
464.743
464.743
473.65
473.65
491.463
491.463
491.463
491.463
491.463
495.916
509.276
509.276
509.276
518.182
518.182
527.089
527.089
540.449
540.449
540.449
544.902
562.715
562.715
562.715

429.473
429.473
429.473
429.473
429.473
429.473
429.473
442.833
442.833
442.833
442.833
451.74
451.74
460.646
460.646
465.099
465.099
474.006
474.006
478.459
487.366
487.366
496.272
496.272
514.085
514.085
514.085
514.085
514.085
518.539
531.898
531.898
531.898
540.805
540.805
549.711
549.711
563.071
563.071
567.524
585.338
585.338
585.338
585.338

452.096
452.096
452.096
452.096
452.096
452.096
452.096
465.456
465.456
465.456
465.456
474.362
474.362
483.269
483.269
487.722
487.722
496.628
496.628
501.082
509.988
509.988
518.895
518.895
536.708
536.708
536.708
536.708
541.161
554.521
554.521
554.521
563.427
563.427
572.334
572.334
585.694
585.694
585.694
590.147
607.96
607.96
607.96
607.96

474.7184
474.7184
474.7184
474.7184
474.7184
474.7184
474.7184
488.0782
488.0782
488.0782
488.0782
496.9847
496.9847
505.8913
505.8913
510.3445
510.3445
519.2511
519.2511
523.7043
532.6109
532.6109
541.5174
541.5174
559.3305
559.3305
559.3305
559.3305
563.7837
577.1436
577.1436
577.1436
586.0501
586.0501
594.9566
594.9566
608.3164
608.3164
608.3164
612.7697
630.5828
630.5828
630.5828
630.5828

Insulation Calc

510
520
530
540
550

98.5669
98.5669
98.5669
116.38
116.38

100.942
118.755
118.755
118.755
118.755

121.752
121.752
121.752
121.752
121.752

125.655
125.655
125.655
125.655
130.108

128.37
128.37
128.37
132.823
132.823

133.743
138.196
151.556
151.556
151.556

157.211
157.211
157.211
157.211
157.211

164.281
164.281
164.281
173.188
173.188

175.592
184.499
184.499
184.499
193.405

196.523
196.523
205.429
205.429
205.429

217.453
217.453
217.453
230.813
230.813

240.076
253.435
253.435
253.435
253.435

277.483
277.483
277.483
281.936
299.749

300.106
304.559
304.559
322.372
322.372

314.223
318.676
336.489
336.489
336.489

341.298471
359.111544
359.111544
359.111544
359.111544

381.734
381.734
381.734
381.734
404

404.356749
404.356749
404.356749
404.356749
426.623089

426.979
426.979
426.979
449.246
449.246

449.602
449.602
471.868
471.868
471.868

472.225
472.225
494.491
494.491
494.491

494.847
494.847
517.113
517.113
517.113

517.47
539.736
539.736
539.736
539.736

540.092
562.359
562.359
562.359
562.359

584.981
584.981
584.981
584.981
584.981

Insulation Calc

607.604
607.604
607.604
607.604
607.604

630.227
630.227
630.227
630.227
630.227

652.8491
652.8491
652.8491
652.8491
675.1155

Insulation Calc

Insulation Calc

Insulation Calc

Insulation Calc

INSULATING MATERIAL CODE NO. 1
CALCIUM SILICATE (PRE-FORMED) TO 1S-8154 (DENSITY 350 KG/CU. M ,
USABLE UPTO 650 DEG.C)
MEAN TEMP.
K, WATT/M

O

O

C

C

SOLUTION CHECK
PERCENT ERROR

50

100

150

200

250

300

350

0.057

0.065

0.075

0.08

0.087

0.092

0.096

0.0579

0.0664

0.0804

0.0859

0.0904

0.0939

0.5

-1.26437

-1.73913

-2.1875

1.578947 2.153846

-1.46667

K = 0.0484 + 0.0002 X T - 2E-07 X T2 .

DERIVED EQUATION :MAXM. % ERROR =

0.0739

2.153846 MINM. % ERROR =

0.0484
0.0002
0.048921 0.000202

-2.1875

INSULATING MATERIAL CODE NO.1
y = -2E-07x2 + 0.0002x + 0.0484
0.12
0.1
0.08
0.06

K, WATT/M O C

0.04

Poly. (K, WATT/M O C)

0.02
0
0

100

200

300

400

TABLE FOR RADIATION EMITTANCE :
Materials

Surface Emittance

"ALUMINIUM"
"POLISHED ALUMINIUM"
"GRAY DULL ALUMINIUM"
"OXIDISED ALUMINIUM"
"ALUMINIUM PAINT"

0.03 to 0.06
0.06 to 0.09
0.10 to 0.12

"NEW ALUMINIUM PAINT "
"AFTER WHETHERING Al PAINT"
"ASBESTOS PAPER (CLEAN)"
"GALVANISED STEEL"
"NEW BRIGHT GALVANISED STEEL"
"DULL GALVANISED STEEL"

0.20 to 0.30
0.40 to 0.70
0.90 to 0.94
0.06 to 0.10
0.20 to 0.30

INSULATING MATERIAL CODE NO. 2
UNBONDED ROCK & SLAG WOOL TO 1S-3677 (DENSITY 150 KG/CU. M ,
USABLE UPTO 550 DEG.C)
MEAN TEMP.
K, WATT/M

O

O

C

C

SOLUTION CHECK
PERCENT ERROR

50

100

150

200

250

0.046

0.052

0.062

0.075

0.088

0.04535

0.0526

0.06235

0.0746

0.08935

-1.41304 1.153846 0.564516 -0.5333333 1.5340909
K = 0.0406 + 0.00007 X T + 5E-07 X T2 .
0.0406 0.00007 -0.0000005
0.040911 7.05E-05 -5.038E-07
1.534091 MINM. % ERROR =
-1.4130435

DERIVED EQUATION :-0.0000002
-2.02154E-07
MAXM. % ERROR =

INSULATING MATERIAL CODE NO.2
y = 5E-07x2 + 7E-05x + 0.0406
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0

K, WATT/M O C
Poly. (K, WATT/M O C)

0

100

200

300

INSULATING MATERIAL CODE NO. 3
BONDED MINERAL WOOL MATTRESS TO 1S-8183 GROUP 3
(DENSITY 80-120 KG/CU.M, USABLE UPTO 450 DEG.C)
MEAN TEMP.
K, WATT/M

O

O

50

100

150

200

250

300

0.043

0.052

0.062

0.073

0.084

0.095

C

C

SOLUTION CHECK
PERCENT ERROR

0.0428

0.0523

0.0623

0.0728

-0.46512 0.576923 0.483871 -0.2739726

0.0838

0.0953

-0.2381 0.315789

K = 0.0338 + 0.000175 X T - 1E-07 X T2 .
0.0338 0.000175 -0.0000001
0.033898 0.000176 -1.003E-07
0.576923 MINM. % ERROR =
-0.4651163

DERIVED EQUATION :-

MAXM. % ERROR =

INSULATING MATERIAL CODE NO.3
y = 1E-07x2 + 0.000175x + 0.0338
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0

K, WATT/M O C
Poly. (K, WATT/M O C)

0

100

200

300

400

INSULATING MATERIAL CODE NO. 4
PRE-FORMED FIBROUS ROCK, SLAG OR GLASS MINERAL WOOL TO 1S-9842
GRADE 3 (DENSITY 121 TO 160 KG/CU.M,USABLE UPTO 450 DEG. C)
O

50

100

150

200

250

300

0.0430

0.052

0.062

0.07

0.085

0.1

SOLUTION CHECK

0.04335

0.05085

0.06035

0.07185

0.08535

0.10085

PERCENT ERROR

0.813953

-2.21154

-2.66129 2.6428571 0.411765

0.85

MEAN TEMP.
K, WATT/M

O

C

C

K = 0.03785 + 0.00009 X T + 4E-07 X T2 .
0.03785 0.00009 0.0000004
0.03835 9.12E-05 4.053E-07
2.642857 MINM. % ERROR =
-2.66129

DERIVED EQUATION :-

MAXM. % ERROR =

INSULATING MATERIAL CODE NO.4
y = 4E-07x2 + 9E-05x + 0.03785
0.12
0.1
0.08
0.06

K, WATT/M O C

0.04

Poly. (K, WATT/M O C)

0.02
0
0

100

200

300

400

INSULATING MATERIAL CODE NO. 5
ROCKLLOYD SECTIONAL PIPE INSULATION (DENSITY 144 KG/CU. M ,
USABLE UPTO 450 DEG.C)
MEAN TEMP.
K, WATT/M

O

O

C

C

SOLUTION CHECK
PERCENT ERROR

100

150

200

250

300

350

0.0349

0.0395

0.0454

0.0535

0.0605

0.0698

0.0814

0.0351

0.0401

0.0461

0.596774 1.420803

1.64588

DERIVED EQUATION :-

MAXM. % ERROR =

50

0.0531

0.0611

0.0701

0.0801

-0.759709 1.031496 0.453474

-1.61414

K = 0.0311 + 0.00007 X T + 2E-07 X T2 .
0.0311 0.00007 0.0000002
0.031356 7.06E-05 2.016E-07
1.64588 MINM. % ERROR =
-1.614144

INSULATING MATERIAL CODE NO.5
y = 2E-07x2 + 7E-05x + 0.0311
0.09
0.08
0.07
0.06
0.05

K, WATT/M O C

0.04
0.03

Poly. (K, WATT/M O C)

0.02
0.01
0
0

100

200

300

400

AMBIENT TEMPERATURE Ta, OC =
SURFACE TEMP. OF THE INSULATION
V, M/Sec
1.5

GENERAL EQUATION :K = A + B.T + C.T2
MATERIAL
CODE NO.

"A"

"B"

"C"

1
2
3
4
5

0.048921
0.040911
0.033898
0.03835
0.031356

0.0002022
7.054E-05
0.0001755
9.119E-05
7.058E-05

-2.022E-07
-5.038E-07
-1.003E-07
4.0529E-07
2.0165E-07

A =

0.033898

HEAT LOSS BY CONVECTION , Qconv
(W / M2 )
HEAT LOSS BY RADIATION, Qrad =
(W / M2 )

EMPERATURE Ta, OC =
TEMP. OF THE INSULATION Ts, OC =
Emittance
Material Code
B =

0.000176

45
60
Tpipe,OC Tmean,OC
65
62.5

0.075
=

3

80
90

70
75

C =

-1.003E-07

100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
510

80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
205
210
215
220
225
230
235
240
245
250
255
260
265
270
275
280
285

S BY CONVECTION , Qconv =

132.81599

S BY RADIATION, Qrad =

8.9359413

520
530
540
550

290
295
300
305

K ,W/MOC K*(Tp - Ts)
0.0444748 0.222374

PIPE NB
15
20
25
32
40
PIPE O.D.
21.336
26.67
33.4
42.164
48.26
0 INS.THK.
<---------------------------------- TRIAL K*(Tp-Ts) = (Qconv + Qrad) * R2 * LN( R
25
20
0.1
0.1
0.1
0.1
0.1

0.0456914 0.9138285
0.0464962 1.3948871

40
50

0.047296
0.0480908
0.0488806
0.0496654
0.0504451
0.0512198
0.0519895
0.0527542
0.0535139
0.0542686
0.0550183
0.0557629
0.0565025
0.0572371
0.0579667
0.0586913
0.0594109
0.0601254
0.060835
0.0615395
0.062239
0.0629335
0.063623
0.0643075
0.0649869
0.0656614
0.0663308
0.0669952
0.0676546
0.068309
0.0689583
0.0696027
0.070242
0.0708764
0.0715057
0.07213
0.0727493
0.0733635
0.0739728
0.074577
0.0751762
0.0757704

1.8918415
2.4045412
2.9328358
3.4765747
4.0356077
4.6097842
5.1989538
5.8029662
6.4216708
7.0549172
7.702555
8.3644338
9.0404031
9.7303125
10.434012
11.15135
11.882177
12.626342
13.383696
14.154087
14.937365
15.733379
16.54198
17.363017
18.196338
19.041795
19.899237
20.768512
21.649471
22.541963
23.445838
24.360945
25.287134
26.224254
27.172156
28.130688
29.0997
30.079042
31.068563
32.068113
33.077542
34.096698

60
65
75
80
90
100
120
125
140
150
160
175
180
200
225
250
275
300
350

25 6.102628 5.738211 5.409162 5.108208 4.951695
40 11.19033 10.48015 9.82456 9.210882 8.885617
50
60
65
75
80
90
100
120
125
140
150
160
175
180
200
225
250
275
300

14.94791
18.9402
21.01355
25.29793
27.50349
32.02989
36.69732
46.40633
48.90421
56.55098
61.76788
67.07307
75.18521
77.92815
89.08116
103.3986
118.0928
133.1273
148.4724

13.98792
17.72044
19.66101
23.67525
25.74378
29.99288
34.37936
43.51787
45.87165
53.08323
58.00791
63.01943
70.68872
73.28348
83.84133
97.41019
111.3515
125.6297
140.2155

13.09305
16.57486
18.38673
22.13818
24.07302
28.05088
32.1618
40.73884
42.95049
49.73217
54.36771
59.08833
66.31839
68.76606
78.73255
91.55646
104.7476
118.2714
132.0992

12.24653
15.48226
17.16717
20.65829
22.46021
26.16762
30.00282
38.01586
40.08433
46.43216
50.77531
55.20137
61.986
64.28434
73.64975
85.7151
98.14108
110.8944
123.9472

11.79388
14.89396
16.50855
19.85496
21.58276
25.13894
28.81948
36.51498
38.50263
44.60515
48.78268
53.04165
59.57327
61.78669
70.80995
82.44274
94.43174
106.7444
119.3535

0.0763596
0.0769438
0.077523
0.0780971

35.125432
36.163593
37.211031
38.267595

50
65
80
100
125
150
200
60.325
73.025
88.9
114.3
141.3
168.3
219.1
Ts) = (Qconv + Qrad) * R2 * LN( R2 / R1 ) ------------------------------------------------------->
0.1
0.1
0.1
0.1
0.1
0.1
0.1

250
273.1

300
323.9

0.1

0.1

4.720441 4.547975 4.393107 4.225563 4.107672 4.024668 3.92049 3.85004 3.804244
8.396279 8.023713 7.682892 7.306679 7.036757 6.843874 6.598183 6.429589 6.318865
11.10702
13.99506
15.49922
18.61745
20.22797
23.54416
26.97845
34.16627
36.02435
41.73282
45.64372
49.63335
55.75644
57.8326
66.30206
77.23337
88.51244
100.1082
111.9945

10.57875
13.29801
14.71375
17.64836
19.16409
22.28558
25.51924
32.29123
34.04278
39.4265
43.11707
46.88368
52.6678
54.6299
62.63837
72.98424
83.6694
94.66417
105.9437

10.09096
12.6494
13.98038
16.7381
18.16213
21.09452
24.13245
30.49656
32.14321
37.20631
40.67873
44.22408
49.67113
51.51962
59.06812
68.82818
78.9175
89.30807
99.97626

9.546874
11.91956
13.15196
15.70269
17.01881
19.72769
22.53297
28.40891
29.92941
34.60561
37.81378
41.09041
46.12688
47.83669
54.82235
63.86288
73.21783
82.86154
92.77224

9.152431
11.38573
12.54362
14.93685
16.1704
18.70734
21.33256
26.82775
28.24931
32.6209
35.62013
38.68362
43.39332
44.99248
51.5278
59.99008
68.75239
77.79127
87.08669

8.868267
10.99842
12.10083
14.37616
15.54759
17.9546
20.44304
25.647
26.99251
31.12915
33.96659
36.8646
41.31977
42.83254
49.01534
57.0231
65.31776
73.87779
82.68471

8.503275
10.49727
11.52594
13.64364
14.73156
16.96301
19.26553
24.07051
25.31123
29.1228
31.73537
34.40255
38.50137
39.89285
45.57913
52.94341
60.57275
68.4487
76.55519

8.250696
10.14783
11.12367
13.1277
14.15504
16.25846
18.42447
22.93388
24.09647
27.66453
30.10772
32.60038
36.42854
37.72759
43.03403
49.90301
57.01723
64.3608
71.91978

8.083808
9.915655
10.85571
12.78235
13.76826
15.78373
17.85548
22.15936
23.26734
26.66452
28.98834
31.3576
34.99364
36.22691
41.26212
47.77557
54.51814
61.47589
68.63652

14
350
355.6

16
400
406.4

18
450
457.2

20
500
508

22
550
558.8

24
600
609.6

26
650
660.4

28
700
711.2

30
750
762

0.1

0.1

0.1

0.1

0.1

0.1

0.1

0.1

0.1

3.782021 3.75337 3.730874 3.712742 3.697815 3.685313 3.674689 3.665548 3.657602
6.2648 6.194764 6.139506 6.094791 6.057861 6.026845 6.000426 5.977652 5.957817
8.002014
9.801474
10.72372
12.61171
13.57687
15.54818
17.57243
21.77227
22.8525
26.16265
28.42549
30.73157
34.26901
35.46844
40.36386
46.69339
53.243
59.99983
66.95242

7.895754
9.652742
10.55156
12.38861
13.32636
15.23918
17.20035
21.26149
22.30463
25.49818
27.67911
29.90017
33.30463
34.45836
39.16458
45.2444
51.53124
58.01366
64.68144

7.811666
9.534716
10.41477
12.21089
13.12655
14.99215
16.90225
20.85061
21.86349
24.96171
27.07549
29.22672
32.52167
33.63769
38.1875
44.06015
50.12822
56.38149
62.81075

7.743455
9.438756
10.30343
12.06593
12.96342
14.79008
16.65795
20.51273
21.50044
24.51919
26.57687
28.66963
31.87273
32.95708
37.37522
43.07295
48.95572
55.01436
61.24053

7.687007
9.359192
10.21103
11.94542
12.82768
14.62166
16.45402
20.22987
21.1963
24.14775
26.1578
28.20087
31.32575
32.38308
36.68876
42.23666
47.96027
53.8513
59.90218

7.639516
9.292146
10.1331
11.84363
12.71295
14.47911
16.28118
19.98954
20.93773
23.83142
25.80053
27.80081
30.85823
31.89224
36.10065
41.51866
47.10395
52.84899
58.74687

7.599006
9.234875
10.06649
11.75651
12.6147
14.35688
16.13281
19.78276
20.71515
23.5587
25.49223
27.45527
30.45388
31.46754
35.59097
40.89522
46.3591
51.97572
57.73877

7.564042
9.185384
10.0089
11.6811
12.5296
14.25091
16.00403
19.60295
20.52151
23.32112
25.22341
27.15374
30.10062
31.09635
35.14486
40.3486
45.70499
51.20772
56.85097

7.533556
9.142186
9.958602
11.61518
12.45517
14.15813
15.89119
19.44513
20.35148
23.11227
24.98692
26.88827
29.78927
30.7691
34.75102
39.8653
45.12582
50.52678
56.06282

32
800
812.8

34
850
863.6

36
900
914.4

38
950
965.2

40
1000
1016

0.1

0.1

0.1

0.1

0.1

3.650629 3.644462 3.638968 3.634042 3.629602
5.940387 5.924949 5.911179 5.898822 5.88767
7.50674
9.104153
9.914299
11.55706
12.38953
14.07624
15.79151
19.30548
20.20097
22.9272
24.77722
26.65271
29.51275
30.47835
34.40071
39.43481
44.60926
49.91871
55.35821

7.482967
9.070409
9.874976
11.50544
12.33119
14.00341
15.70279
19.18104
20.0668
22.76206
24.58998
26.44227
29.26549
30.2183
34.08703
39.04884
44.14558
49.37228
54.72436

7.461748
9.040267
9.839838
11.45927
12.27901
13.93822
15.62333
19.06943
19.94644
22.61379
24.42177
26.2531
29.04305
29.9843
33.8045
38.70079
43.72698
48.87847
54.15098

7.442692
9.013179
9.80825
11.41775
12.23206
13.87952
15.55174
18.96877
19.83785
22.47991
24.26981
26.08213
28.84186
29.77261
33.54867
38.38529
43.34715
48.42996
53.62973

7.425484
8.988703
9.779699
11.38019
12.18958
13.82639
15.48691
18.87751
19.73938
22.35842
24.13186
25.92684
28.659
29.58015
33.31589
38.09794
43.00088
48.02072
53.15373

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