Document bGnEx5zNkx2nradqOmbVVRJ1

Heating Ventilating Air Conditioning Guide 1938 Table 13. Coefficients of Transmission (U) for Pipes Insulated with 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 Thxcenbbb InHUOLAfTIO` N (Inches) Pipe . Size* . (Inches) a lA im ia 2 2A 3 . i 3% i4 *A ,5 6 8 10 : 12 Hot Water I 120 F 1 150 P 180 F 210 F | 227.1 F (5 Lb) Temperature Difference 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 *0F 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 0.459 110 F 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 140F 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 6.475 157.1 F 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 Steam 297.7 K (50 Lb) 227.7 F 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) 267.9 F 1.022 0.921 0.840 0.771 0.731 0.685 0.651 0.626 0.604 0.589 0.575 0.565 0.553 0.532 0.514 0.507 A 6.755 . .0.767 0.780 0.793 0.800 0.831 0.848 *A 0.674 0.685 0.697 0.708 0.715 0.743 0.759 l 0.607 0.618 0.628 0.639 0.645 0.670 - 0.684 \A > 0.553 0.562 0.572 0.581 0.587 0.610 0.622 ; XA 5 2 ci 0.517 .0.527 6.481 0.490 0.536 0.499 0.545 0.508 0.550 0.513 0.572 0.535 0.584 0.547 IA ' .0.453 0.460 0.469 0.477 0.481 0.500 0.511 : 3. 0.429 0.436 .0.444 0.452 0.456 0.475 0.485 \a 314 A 0.412 0.419 0.427 0.434 0.438 0.456 0.465 0.400 0.407 0.415 0.422 0.426 0.443 0.453 \ AA 0.390 0.396 0.402 0.409 0.413 0.429 0.437 5 0.380 0.386 0.393 0.400 0.403 0.418 0.427 6 0.369 0.375 0.382 0.389 0.392 0.408 0.417 ; :8 0.351 0.358 0.364 0.370 0.374 0.388 0.397 i 10 0.337 0.344 0.350 6.356 0.359 0.373 0.382 .12 , 0.332 0.338 0.344 0.350 0.353 0.367 0.375 : 14 % 1 tu ia .2 ; .214 !3 2 3)4 4. : IA r 5 . . -i 6 4 r. -8 io / 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 6/370 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 0.302 728 Chapter 39. Piping and Duct Insulation Table 14. Coefficients of Transmission (U) for Pipes Insulated with Rock Wool Type Insulation 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 ` Of Insulation (Inches) i - . 2 Nominal Pipe Size (Inches) )4 % 1 m lA 2 m 3 ^/4 .4 . AA .5 ' 6. 8 : 10 12 = A 1 U4 114 2 VA 3 3)4 4 i'A 5 6 "8 . 10 12 - -A ZA l 1M lA 2 2A '3 iA . 4 4A 5 .6 8 10 12 120 F 50 F 0.631 0.569 0.518 0.476 0.450 0.422 0.402 0.385 0.373 0.363 0.355 0.348 0.341 '0.327 0.317 0.313 Hot Water Steam 150 F 180 F 210 F r'227.1 F 1 (5 Lb) 297.7 F 1 337.9 F (50 Lb) (100 Lb) Temperature Difference 80 F 110 F . 140F 157.1 F 227.7 F . 267.9 , 0.644 0.658 0.581 0.593 0.529 0.541 0.486 0.497 0.460 0.470 0.431 0.441 0.411 0.420 0.394 0.402 0.381 0.389 0.371 0.379 0.363 0.371 0.356 0.364 0.348 0.356 0.335 0.342 0.324. 0.331 0.320. 0.327 0.672 0.606 0.552 0.507 0.480 0.450 0.428 0.411 0.398 0.387 0.379 0.371 0.363 0.349 0.338 .0.334 0.680 0.613 0.559 0.513 0.485 0.456 0.434 0.415 0.402 0.392 0.383 0.376 0.368 0.353 0.343 0.338 . 0.712 0.642 0.585 0.537 0.508 0.478 0.455 0.435 0:421 0,411 0.402 0.394 0.386 0.372 0.360 0.355 0.730 0.659 0.600 0.551 0.522 0.490 0.466 0.446 0.432 0.422 0.413. 0.404 0.396 0.381 0.369 0.364 0.523 0.468 0.421 0.383 0.359 0.333 0.314 0.296 0.286 0.278 0.270 0.263 0.257 0.244 O'. 235 0.230 0.534 0.477 0.430 0.391 0.366 0.340 0.320 0.302 0 i 291 0.284 0.276 0.269 0.262 0.249 0,240 0.234 0.545 0.487 0.440 0.399 0.375 0.348 0.327 0.310 0.298 0.290 0.282. 0.275 0.267 0.254 0.245 0.239 0.556 0.497 0.449 0.407 0.383 0.356 0.335 0.317 0.304 0.296 0.287 0.280 0.273 0.260 0.250 0.245 0.563 0.503 0.455 0.412 0.387 0.360 0.339 0.321 0.307 0.300 0.291 0.284 0.277 0.263 0.253 0.247 0.590 0.528 0.477 0.433 0.407 0.378 0.355 0.337 0.323 0.315 0.305 0.298 0.290 0.276 ' 41.265; 0.260 0.606 0.542. 0.490 0.444 0.419 0.389, 0.365 0.347 0.332 0.323 0.313 0.305 0.297 0.283 0.272. 0.267 0.461 0.409 0.366 0.333 0.310 0.286 0.268 0.252 0.241 0.232 0.225 0.218 0.213 0.200 0.189 0.185 0.471 0.418 0.374 0.340 0.316 0.292 0.274 0.257 0.246 0.237 0.230 0.223 0.217 0.204 0.193 0.190 0.481 0.427 0.382 0.347 0.323 0.298 0.279 0.262 0.251 0.242 0.235 0.228 0.221 0.208 0.197 0.194 0.491 0.436 0.390 0.355 0.330 0.304 0.285 0.268 0.257 0.247 0.240 0.233 0.226 0.213 0.-201 0.198 0.496 0.441 0.395 0.359 0.334 0.308 0.289 0.272 0.260 0.250 0.243 0.236 0.228 0.215 0.204 . 0.200 0.520 0.534 0.463 0.475 0.415 0.427 i 0.377 0.387 0.351 0.360 0.323 0.331 : 0.302 0.310 : 0.284 0.292 0.272 . 0.280 0.262 0:269 0.255 0.262 0.247 0.253 0.239 0.245 0.225 0.231 0.214 0.220 0.210 0.216