Document aDe5emw5K4LgzGRkp4LEpORVB

American Society of Heating and Ventilating Engineers Guide, 1936 Table 9. Coefficients of Transmission (U) for Pipes Insulated with Laminated Asbestos Type Insulation (30 to 40 Laminations Per Inch Thickness) These coefficients are expressed in Btu per hour per square foot of pipe surface per degree Fahrenheit difference in temperature between pipe and surrounding still air at 70 F Thickness or Inbulatiom Nominal Pipe Size (Inches) i . ,,r . i V IX 2 ; ! ___ k X i IX IX 2 2X 3 3K 4 4K 5 6 8 10 12 X X 1 IK IK 2 2X 3 3K 4 4K S 6 8 10 M2 X X 1 IK IK 12 2X 3 3X 4 4K 5 6 8 10 12 120 F . 50 F 0.605 0.546 0.498 0.457 0.432 0.406 0.385 0.370 0.359 0.349 0:341 0.334 0.327 0.314 0.304 0.301 Hot Water 150 F 180 F 210 F 227.1 F (5 Lb) Temperatube Difference 80 F. 110 F 140 F ] 157.1 F 0.620 0.560 0.510 0.468 0.442 0.416 0.395 0.379 0.367 0.358 0.350 0.342 0.335 0.322 0.312 0.308 0.635 0.573 0.522 0.480 0.453 0.426 0.405 0.389 0.376 0.366 0.359 0.351 0.343 0.330 0.320 0.316 0.650 0.586 0.534 0.491 0.464 0.437 0.415 0.398 0.385 0.375 0.367 0.359 0.351 0.338 0.328 0.324 0.658 0.594 0.541 0.497 0.470 0.442 0.420 0.403 0.390 0.380 0.372 0.364 0.356 0.343 0.332 0.328 Steam 297.7 F (SO Lb) 227.7 F 0.695 0.627 0.570 0.525 0.496 0.467 0.443 0.425 0.413 0.402 0.393 0.384 0.376 0.362 0.350 0.346 337.9 F (100 Lb) 267.9 F 0.716 0.645 0.587 0.540 0.511 0.481 0.457 0:438 0.426 0.414 0.405 0.395 0.387 0.373 0.361 0.356 0.502; 0.450 0.405 0.369 0.343 0.321 0.301 0.286 0.274 0.267 0.259 0.253 0.247 0.234 0.223 0.221 0.514 0.461 0.415 0.378 0.352 0.329 0.309 0.293 0.281 0.273 0.266 0.260 0.253 0.240 0.229 0.227 0.526 0.473 0.426 0.387 0.361 0.337 0.317 0.301 0.288 0.280 0.272 0.266 0.260 0.246 0.235 0.232 0.539 0.484 0.436 0.396 0.370 0.345 0.324 0.308 0.295 0.287 0.279 0.272 0.266 0.252 0.241 0.238 0.546 0.490 0.442 0.401 0.375 0.350 0.330 0.313 0.300 0.291 0.283 0.276 0.269 0.255 0.245. 0.241 0.577 0.517 0.466 0.423 0.397 0.369 0.348 0.330 0.316 0.307 0.299 0.291 0.284 0.270 0.258 0.255 0.595 0.532 0.480 0.435 0.409 0.380 0.358 0.340 0.326 0.317 0.308 0.300 0.293 0.279 0.266 0.263 0.442 0.392 0.352 6.319 0.297 0.274 0.256 0.243. 0.231 0.223 0.216 0.210 0.203 0.191 0.182 0.178 0.453 0.402 0:360 0.327 0.304 0.280 0.262. 0.249 0.236 0.228 0.222 0.215 0.208 0.196 0:187 0.183 0.464 0.475 0.481 0.412 0.422 0.428 0.369 0.378 0.383 0.335 0.343 0.348 0.311 0.319 0.323 0.287 0.294 0.298 0.269 0.275 0.279 0.254 0.260 0.264 0.242 0.248 0.251 0.234 0.240 0.243 0.227 0.233 0.236 0.220 0.225 0.228 0.213 0.218 0.221 0.201 0.206 0.209 0-1192 0:196 0.199 0.187 | 0.192 1 0.195 0.508 0.452 0.405 0.367 0.341 0.314 6.293 0.277 0.265 0.257 0.249 0.241 0.233 0.220 0.210 0.205 0.523 0.465 0.417 0.379 0.352 0.324 0.302 0.285 0.273 0.265 0.256 0.248 0.240 0.227 0.215 0.210 Chapter 36--Insulation of Piping Table 10. Coefficients of Transmission (I/) for Pipes Insulatedwith Laminated Asbestos Type Insulation (Approximately 20 Laminations Per Inch Thickness) These coefficients are expressed in Btu per hour per square foot of pipe surface per degree Fahrenheit difference in temperature between pipe and surrounding still air at 70 F ' Thickness or Insulation (Inches) i IK 2 Nominal Pipe Size . (Inches) K X l IK IK 2 2K 3 3K 4 4K 5 6 8 10 12 120 F 50 F 0.910 0.823 0.748 0.686 0,649 0.610 0.581 0.558 0.539 0.524 0.514 0.503 0.492 0.473 0.458 0.452 Hot Water Steam 150 F 180 F 210 F 227.1 F (5 Lb) 297.7 F (50 Lb) Temperature Difference 80 F 110 F 140 F 157.1 F 227.7 F 0.925 0.836 0.760 0.698 0.659 0.620 0.590 0.567 0.548 0.532 0.522 0.511 0.500 0.480 0.465 0.459 0.940 0.850 0.773 0.710 0.671 0.630 0.600 0.576 0.557 0.541 0.530 0.519 0.509 0.488 0.473 0.467 0.956 0.863 0.785 0.721 0.682 0.640 0.609 0.585 0.566 0.551 0.539 0.528 0.517 0.497 0.481 0.475 0.964 0.871 0.792 0.728 0.688 0.647 0.615 0.591 0.571 0.556 0.544 0.533 0.522 0.502 0.485 0.478 1.001 0.902 0.823 0.756 0.716 0.671 0.638 0.613 0.592 0.577 0.564 0.553 0.542 0.521 0.504 .0.497 337.9 F (100 Lb) 267XF 1.022 0.921 0.840 0.771 0.731 0.685 0.6510.626 0.604 0.589 0.575 0.565 0.553 0.532 0.514 0,507 K X 1 IKIK 2 2K 3 3K 4 4K 5 6 8 10 12 0.755 0.767 0.780 0.674 0.685 0.697 0.607 0.618 0.628 0.553 0.562 0:572 0.517 0.527 0.536 0.481 0.490 0.499 0.453 0.460 0.469 0.429 0.436 0.444 0.412 0.419 0.427 0.400 0.407 0.415 0.390 0.396 . 0.402 0.380. 0.386 0.393 0.369 0.375 0.382 0.351 0.358 0.364 0.337 0.344 0.350 0.332 0.338 0.344 0.793 0.708 0:639 0.581 0.545 0.508 0.477 0.452 0.434 0.422 0.409 0.400 0.389 0.370 0.356 0.350 0.800 0.715 0.645 0.587 0.550 0.513 0.481 0.456 0.438 0.426 0.413 0.403 0.392 0.374 0.359 0.353 0.831 0.743 0.670 0.610 . 0.572 0.535 0.500 0.475 0.456 0.443 0.429 0.418 0.408 0.388 0.373 0.367 0.848 0.759 0.684 0.622 0.584 0.547 0.511 0.485 0.465 0.453 0.437 0.427 0.417 0.397 0.382 0.375 K X- l IK : IK 2 2X .3 3K 4 4K 5 6 8 ' UP 12 0.664 0.591 0.529 0.480 0.445 0.412 0.385 0.364 0..346 0.336 0.325 0.316 0.306 0.288 0.275 0.269 0.675 0.601 0.538 0.488 0.453 0.420 0.392 0.370 0.352 0.342 0.332 0.322 0.312 0.293 0.279 0.274 0.687 0.611 0.547 -0.497 0.462 0.427 0.398 0.376 0.358 0.348 0.338 0.327 0.317 0.298 0:284 0.278 0.698 0.621 0.557 0:505 0.470 0.434 0.405 0.382 0.365 0.354 0.343 0.333 0.323 0.303 0:289 0.283 0.704 0.627 0.562 0.510 0.475 0.438 0.409 0.385 0.368 0.357 0.346 0.336 0.326 0.306 0.292 0.286 0.732. 0.652 0.584 0.529 0.494 0.455 0.425 0.400 0.382 0.371 0.360 0.349 0.338 0.317 0.302 0.296 0.747 0.665 0.597 0.540 0.504 0.464 0.434 0.408 0.390 0.378 0.367 0.356 0.345 0.324 0.308 0.302 661