Page 122 - Applied Process Design For Chemical And Petrochemical Plants Volume III

66131_Ludwig_CH10C 5/30/2001 4:21 PM Page 89

Heat Transfer 89

Table 10-13A
Metal Resistance of Tubes and Pipes

Value of r w
Thermal
Conductivity, K 25 63 89 21 17 14.6 238 34.4 85 10 57.7
4—6%
Red Chrome
Brass, 1 / 2 % Moly Stainless Yorkalbro,
OD Carbon .45% Ars. Steel 80—20 70—30 Copper AISI Type Alum.
Tube Gauge Factor Steel Admiralty Copper CU-NI CU-NI Monel 99.9 % CU Nickel Aluminum 302 & 304 Brass
5 / 8 in. 18 .00443 .000177 .000070 .000050 .000211 .000261 .000303 .000019 .000129 .000052 .000443 .000077
16 .00605 .000242 .000096 .000068 .000288 .000356 .000414 .000025 .000176 .000071 .000605 .000105
14 .00798 .000319 .000127 .000090 .000380 .000469 .000547 .000034 .000232 .000094 .000798 .000138
18 .00437 .000175 .000069 .000049 .000208 .000257 .000299 .000018 .000127 .000051 .000437 .000076
16 .00593 .000237 .000094 .000067 .000282 .000349 .000406 .000025 .000172 .000070 .000593 .000103
3
/ 4 in. 14 .00778 .000311 .000123 .000087 .000370 .000458 .000533 .000033 .000226 .000092 .000778 .000135
13 .00907 .000363 .000144 .000102 .000432 .000534 .000621 .000038 .000264 .000107 .000907 .000157
12 .01063 .000425 .000169 .000119 .000506 .000625 .000728 .000045 .000309 .000125 .001063 .000184
18 .00429 .000172 .000068 .000048 .000204 .000252 .000294 .000018 .000125 .000050 .000429 .000074
16 .00579 .000232 .000092 .000065 .000276 .000341 .000397 .000024 .000168 .000068 .000579 .000100
1 in. 14 .00754 .000302 .000120 .000085 .000359 .000444 .000516 .000032 .000219 .000089 .000754 .000131
13 .00875 .000350 .000139 .000098 .000417 .000515 .000599 .000037 .000254 .000103 .000875 .000152
12 .01019 .000408 .000162 .000114 .000485 .000599 .000698 .000043 .000296 .000120 .001019 .000177
10 .01289 .000516 .000205 .000145 .000614 .000758 .000883 .000054 .000375 .000152 .001289 .000223
8 .01647 .000659 .000261 .000185 .000784 .000967 .001128 .000069 .000479 .000194 .001647 .000285
18 .00425 .000170 .000067 .000048 .000202 .000250 .000291 .000018 .000124 .000050 .000425 .000074
16 .00571 .000228 .000091 .000064 .000272 .000336 .000391 .000024 .000166 .000067 .000571 .000099
1 / 4 in. 14 .00741 .000296 .000118 .000083 .000353 .000436 .000508 .000031 .000215 .000087 .000741 .000128
1
13 .00857 .000343 .000136 .000096 .000408 .000504 .000587 .000036 .000249 .000101 .000857 .000149
12 .00995 .000398 .000158 .000112 .000474 .000585 .000682 .00042 .000289 .000117 .000995 .000172
10 .01251 .000500 .000199 .000141 .000596 .000736 .000857 .000053 .000364 .000147 .001251 .000217
8 .01584 .000634 .000251 .000178 .000754 .000932 .001085 .000067 .000460 .000186 .001584 .000275
18 .00422 .000169 .000067 .000047 .000201 .000248 .000289 .000018 .000123 .000050 .000422 .000073
16 .00566 .000226 .000090 .000064 .000270 .000333 .000388 .000024 .000165 .000067 .000566 .000098
1 / 2 in. 14 .00732 .000293 .000116 .000082 .000349 .000431 .000501 .000031 .000213 .000086 .000732 .000127
1
13 .00845 .000338 .00134 .000095 .000402 .000497 .000579 .000036 .000246 .000099 .000845 .000146
12 .00979 .000392 .000155 .000110 .000466 .000576 .000671 .000041 .000285 .000115 .000979 .000170
10 .01226 .000490 .000195 .000138 .000584 .000721 .000840 .000052 .000356 .000144 .001226 .000212
8 .01545 .000618 .000245 .000174 .000736 .000909 .001058 .000065 .000449 .000182 .001545 .000268
18 .00419 .000168 .000067 .000047 .000200 .00246 .000287 .000018 .000122 .000049 .000419 .000073
16 .00560 .000224 .000089 .000063 .000267 .000329 .000384 .000024 .000163 .000066 .000560 .000097
2 in. 14 .00722 .000289 .000115 .000081 .000344 .000425 .000495 .000030 .000210 .000085 .000722 .000125
13 .00831 .000332 .000132 .000093 .000396 .000489 .000569 .000035 .000242 .000098 .000832 .000144
12 .00961 .000384 .000153 .000108 .000458 .000565 .000658 .000040 .000279 .000113 .000961 .000167
10 .01197 .000479 .000190 .000134 .000570 .000704 .000820 .000050 .000348 .000141 .001197 .000207
8 .01499 .000600 .000238 .000168 .000714 .000882 .001027 .000063 .000436 .000176 .001499 .000260
Pipe
/ 4 in. St’d .01055 .000422 .000167 .000119 .000502 .000621 .000723 .000044 .000307 .000124 .001055 .000183
3
IPS X Hvy .01504 .000602 .000239 .000169 .000716 .000885 .001030 .000063 .000437 .000177 .001504 .000261
Sch. 160 .0229 .000916 .000363 .000257 .001090 .001347 .00157 .000096 .000666 .000269 .00229 .000397
XX Hvy .0363 .00145 .000576 .000408 .00173 .00214 .00249 .000153 .001055 .000427 .00363 .000629
Pipe
1 / 2 in. St’d .01308 .000523 .000208 .000147 .000623 .000769 .000896 .000055 .000380 .000154 .001308 .000227
1
IPS X Hvy .01863 .000745 .000296 .000209 .000887 .001096 .001276 .000078 .000542 .000219 .001863 .000323
Sch. 160 .0275 .00110 .000437 .000309 .00131 .00162 .00188 .000116 .000799 .000324 .00275 .000477
XX Hvy .0422 .00169 .000670 .000474 .00201 .00248 .00289 .000177 .001227 .000496 .00422 .000731
r w for 1 in. O.D. 16 BWG steel tube with 18 BWG admiralty liner .00031
For other materials, divide factor number by the thermal conductivity of various materials:
60—40 Brass .....................55 Chrome Vanadium Steel ........ Tin ..........................35 Everdur 50.................19
Zinc .................................64 SAE 6120..................................23.2 Lead........................20 Wrought Iron ...............40
......................................... .................................................. ................................ Alcunic..........................56.5
1
2
K in Btu>1hr21ft 21°F>ft2 r w in Used by permission: Griscom-Russell/Ecolaire Corporation.
2
Btu>1hr21ft 21°F2