Document Z4jq1LyNdJ34y2VDwK5KEoa9Y

American Society of Heating and Ventilating Engineers Guide, 1937 Table 7. Coefficients of Transmission (U) for Pipes Insulated with Corrugated Asbestos Type Insulation (4 Plies 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 Nominal Pipe Size (Inches) K K l ik IK 2 2K 3 3K 4 4K 5 6 8 10 12 120 F 50 F 0.890 0.803 0.73i; 0.671 0.63S 0.595 0.567 0.544 0.527 0.513 0.502 0.490 01480 0:462 0.447 0.441 Hot Water 150 F 180 F 210 F Steam 227.1 F | 297.7 F (5 Lb) ! (50 Lb) 80 F Temperature Difference 110 F 140 F j 157.1 F 227.7 F 0.919 0.829 0.756 0.693 0.656 0.615 0.586 0.562 01544 01530 0.518 0.507 01496 0.477 0.462 0.456 0.949 0.857 0.780 0.716 0.677 0.635 0.605 0.580 0.561 0.548 0.535 0.523 01512 0.493 0.476 0.470 0.978 0.883? 0.804 0.738 0.698 0.656 0.624 0.598 0.578 0.565 0.551 0.539 0.528 0.508 0.491 0.485 0.995 0.898 0.818 0.751 0.710 0.667 0.635 0.608 0.588 0.575 0.561 0.549 0.538 0.517 0.500 0.493 1.065 0.961 0.876 0.804 0.760 0.715 0.680 0.652 0.631 0.616 0.601 0.588 0.577 0.554 0.537 0.529 ' 337.9T~ (100 Lb) 267.9 F" 1.106~ 0.997 0.909 0.834 0.788 0.742 0.705 0.677 0.654 0.639 0.624 0.611 0.599 0.575 0.557 0.550 K K 1 IK IK 2 2K 3 3K 4 4K s 6 8 10 12 0.737 0.657 0.594 0.542 0.507 0.471 0.443 0.421 0.403 0.393 0.383 0.372 0.362 0.343 0.328 0.323 0.762 0.679 0.614 0.559 0.524 0.487 0.458 0.435 0.417 0.405 0.394 0.384 0.374 0.354 0.339 0.334 0.787 0.702 0.634 0.577 0.541 0.503 0.473 0.449 0.430 0.418 0.407 0.397 0.387 0.366 0.351 0.346 0.812 0.7?5 0.654 0.596 0.558 0.519 0.488 0.463 0.443 0.432 0.420 0.409 0.399 0.378 0.362 0.357 0.826 0.737 0.666 0.606 0.568 0.528 0.497 0.472 0.451 0.439 0.428 0.417 0.406 0.385 0.369 0.364 0.884 0.790 0.713 0.649 0.609 0.565 0.533 0.506 0.483 0.471 0.460 0.447 0.436 0.413 0.397 0.391 0.918 0.820 0.740 0.673 0.632 0.587 0.553 0.525 0.502 0.489 0.476 0.463 0.452 0.429 0.413 0.407 K 0.648 0.670 0.692 0.713 0.726 0.779 0.810 K 0.578 0.598 0.617 0.637 0.648 0.694 0.720 1 0.518 0.535 0.552 0.570 0.580 0.622 0.645 IK 0.469 0.485 0.501 0.517 0.527 0.566 0.587 IK 0.438 0.452 0.467 0.481 0.490 0.526 0.545 2 0.404 0.417 0.430 0.444 0.452 0.483 0.502 2K 0.379 0.391 0.403 0.415 0.422 0.451 0.466 3 0.356 0.367 0.378 0.390 0.397 0.425 0.440 2 3K 0.339 0.350 0.361 0.373 0.380 0.406 0.421 4 0.328 0.339 0.350 0.360 0.367 0.392 0.406 4K 0.318 0.328 0.339 0.350 0.357 0.381 0.395 5 0.308 0.318 0.329 0.340 0.346 0.370 0.384 6 0.299 0.309 0.319 0.329 0.335 0.358 0.371 8 0.282 0.291 0.301 0.310 0.315 0.336 0.349 10 0.267 0.276 0.285 0.294 0.299 0.319 0.332 12 0.263 0.272 0.280 0.289 0.294 0.314 0.325 ' Chapter 36--Insulation of Piping Table 8. Coefficients of Transmission (U) for Pipes Insulated with Corrugated Asbestos Type Insulation (8 Plies 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) - 1 IK 2 Pipe Size (Inches) K K l iK IK 2 2K 3 3K 4 4K 5 6 8 10 12 K K l IK iK 2 2K 3 3K 4 4K 5 6 8 10 12 K K l IK IK 2 2K 3 3K 4 4K 5 6 8 10 12 120 F Hot Water 150 F 180 F 1 210 F I 227.1 F (5 Lb) Steam 297.7 F (50 Lb) 337.9 F~ (100 Lb) 50 F 80 F 0.801 0.723 0.658 0.606 0.573 0.538 0.511 0.489 0.474 0.461 0.451 0.442 0.432 0.416 0.402 0.397 0.820 0.739 0.673 0.619 0.586 0.550 0.523 0.501 0.485 0.472 0.462 0.452 0.442 0.426 0.412 .0.406 Temperature Difference 110 F 140 F | 157.1 F 0.838 0.756 0.688 0.633 0.599 0.562 0.534 0.512 0.496 0.482 0.472 0.462 0.452, 0.436 0.421 0.415 0.857 0.868 0.773 0.783 0.704 | 0.713 0.647 0.655 0.612 0.619 0.575 0.581 0.546 0.553 0.524 0.531 0.507 0.514 0.493 0.500 0.482 0.489 0.473 0.479 0.463 0.468 0.446 0.451 0.430 0.435 0.424 0.429 227.7 F 0.913 0.824 0.751 0.688 0.652 0.612 0.582 0.558 0.542 0.527 0.515 0.505 0.493 0.475 0.459 0.452 267.9 F 0.939 0.847 0.772 0.707 0.670 0.629 0.599 0.575 0.557 0.542 0.530 0.520 0.508 0.489 0.473 0.466 0.664 0.593 0.535 0.488 0.457 0.425 0.399 0.378 0.363 0.353 0.343 0.334 . 0.325 0.309 0.295 0.291 . 0.679 0.607 0.547 0.499 0.467 0.434 0.408 0.387 0.371 0.361 0.351 ,0.342 0.333 0.316 0.303 0.298 0.695 0.621 0.560 0.510 0.478 0.444 0.418 0.396 0.380 0.369 0.360 . 0.350 0.341 0.324 0.310 0.306 0.711 0.636 0.573 0.522 0.490 0.455 0.428 0.405 0.388 0.378 0.368 0.358 0.349 0.332 0.318 0.313 0.720 0.643 0.580 0.528 0.496 0.460 0.434 0.411 0.393 0.383 0.373 0.363 0.353 0.336 0.322 0.317 0.759 0.677 0.611 0.556 0.522 0.485 0.457 0.433 0.415 0.403 0.393 0.383 0.373 0.355 0.340 0.335 0.780 0.697 0.629 0.572 0.537 0.499 0.471 0.446 0.427 0.415 0.404 0.394 0.383 0.365 0.350 0.344 0.585 0.520 0.465 0.422 0.394 0.364 0.339 0.319 0.304 0.295 0.285 0.278 0.269 0.253 -0.240 0.236 0.599 0.533 0.476 0.432 0.403 0.372 0.347 0.327 0.311 0.302 0.292 0.284 0.275 0.259 0.245 0.241 0.613 0.545 0.487 0.442 0.412 0.380 0.355 0.334 0.318 0.308 0.299 0.290 .0.282 0.265 0.251 0.247 0.627 0.635 0.558 0.565 0.498 0.504 0.452 0.458 0.422 0.427 0.388 0.393 0.363 0.367 0.342 0.346 0.326 0.330 0.315 0.319 0.306 0.310 0.297 | 0.301 0.288 0.292 0.270~ 0.273 0.257 0.260 0.253 | 0.256 0.668 0.595 0.532 0.483 0.450 0.415 0.387 0.365 0.349 0.336 0.327 0.317 0.307 0.288 0.275 0.270 0.688 0.612 0.547 0.497 0.462 0.427 0.398 0.375 0.358 0.345 0.336 0.326 0.315 0.296 0.282 0.277- 675 /