Document XO2z2QRrBzQ13kZaaXaJKxzDg

Heating Ventilating Air Conditioning Guide 1938 UTable 9. Coefficients of Transmission ( ) for Pipes Insulated ' with 85 Per Cent Magnesia 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 atr at 70 F Thickness or !\ :. Insulation /(Inches) Nominal : ... Pipe ... . .Size / (Inches); / . 120 F Hot Wateb . 150 F. 180 F 210 F 227.1 F (5 Lb) ; Temperature DirrsHENCs 50 F 80T 110 F 140 F 157.1 F i.-L. ` * .' V ..... . ` ; - . - 1 -- - J' > 'x %' 1 1)4 " .-: 1)4 .2 2)4 3 3)4 4 4)4 ..... 5 . 6 10 12 0.744 0.672 0.613 0.562 0.532 ,0.500 0.475 :0.455 0.4410.429 0.420 0.411 0.402 0.387 0.375 .0.369 0.754 0.681 0.621 0.570 0.539 0.506 0.481 0:461 0.447 " 0.435 0.425 0.416 0.408 0.392 0.380 0.374 0.764 0.689 0.629 0.577 0.546 .0.512 0.487 ' 0.467 0.452 0.441 0.431 0.422 0.413 0.397 0.385 0.378 0.774 0.697 0.637 0.585 0.553 0.519 0.493 0.474 0.458 0.446 0.437 0.427.. 0.419 0.403 0.390 0,383. 0.779 0.701 0.641 0.589 0.557 0.523 0.497 0.477 0.462 0.449 0.440 0.430 01422 0.405 0.393 0.386 Steam 297.7 F (50 Lb) 227.7 F 0.802 0.721 0.659 0.606 0.573 0.538 0.512 0.492 0.475 0.463 0.453 0.443 0.435 0.418 0.405 0.398 337.9 F (100 Lb) 267.9 F 0.814 0.731 0.670 0.617 0.582 0.547 0.520 0.500 0.483 0.471 0.460 0.450 0.442, 0.425 0.412 0.405 ! i)4 )^4 - - ,1 -- 1)4 1)4 . 2 ' ... 23 )4 . 3)4 4 4)4 5 . .6 . 8 '' 10 ' 12 0.617. 0.550 0.496 0.453 .0.424. 0.394 0.371 0.3520:339 0.328 0.320 0.312 0.303 0.287 0.276 0.272 0.625. 0.558 0.503 0.459 0.430 0.400 0.376 0.357 0.343 0.333 0.324 0.316 0.307 0.291 0.280 0.275 0.633 0.566 0.511 0.465 0.436 0.405 0.382 0.362 0.347 0.337 0.328 0.320 0.311 0.295 0.284 0.279 0.642 0.573 0.518 0.472 . 0.442 0.410 0.386 0.367 0.351 0.341 0.332 0.324 0.315 0.299 0.288 0.283 0.646 0.577 0.522 0.475 0.445 0.413 0.389 0.370 0.354 0.343 0.334 0.326 0.318 0.301 0.290 6.285 0.665 0.596 0.540 0.490 0.459 0.427 0.401 0.380 0.364 0.353 0.343 0.336 0.328 0.311 0.299 0.294 0.676 0.606 . 0.549 " 0.498 0.467 0.434 0.408 0.387 0.370 0.359 0.350 6.342 0.333 0.316 0.304 0.299 H~ : 0.543 0.551 0.558 0.565 0.569 0.587 0,597. % 01484 0.490 0.497 0.503 0.507 0.523 0.532 . 1 0.433 0.439 0.445 0.451 0.454 0.467 0.476 1)4 1)4 2 0.393 0.365 0.338 0.398 0.370 0.343 0.403- 0.409 0.376 0.381 0.347 0.351 0.412 0.384 0.354 0.424 0.432 0.397. 0.402 0.364 0.370 2)4 3 0.316 0.320 0.324 0.328 1.0.331:. ,0.341: 0.347 0.297 0.301 0.305 0.309 10.312" 0.321 . 0.326 '"2 3)4 0.284. 0.288 0.292 0.295 0.297 0.306 0.311 .- : 4 0.275 0.278 0.282 0.285 0.287 0.296 0.301 , 4)4 0.266 0.270 0.273 0.276 0.278 0.286 0.290 5 ' 0:258 0.262 0.265 . 0.268 0.270 0.278 0.283. 6 0.250 0.254 0.257 0.260` | 0.262 0.270 0.274 . 8 ' 0.236 0.239 0.242 0.245 0.247 0.255 0.258 10 0.224 0.227 0.230 0.233 0.235 0.242 0.246 12 0.219 0.222 , 0.225 0.228 1 0.230 0.237 0.240 724 Chapter 39. Piping and Duct Insulation UTable 10. Coefficients of Transmission ( ) 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 . 2 * , -.:j .. -.7 1 Nominal Pipe Size' (Inches) )4 % l IK 1)4 2 . 2)4 .. 3 - ; 3)4 . 4 4K 568 10 . :12 120 F 50 F 0.890 0.803 0.731 0.671 0.635 0.595 0.567 0.544 6.527 0.513 0.502 0.490 0.480 0.462 0.447 0.441 Hot Wateb 1 150 F 180 F 210 F 227.1 F U (5 Lb) Temperature Dipperencb 80 F 110 F 140 F g 157.1 F 0.919 0.829 0.756 0.693 0.656 0.615 0.586 0.562 0.544 0.530 0.518 0.507 0.496 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 0.512 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 Steam 297.7F (50 Lb) 227.7 F 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 0.529 337.9 F (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 )4 K l IK 1)4 2 2)4 3 3)4 4 . 4K 5 "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 0.725 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 )4 K - 1 IK 1)4 2 2)4 3 4' 4)4 5 6 8 10 ; 12 0.648 0:578 0.518 : 0.469 0.438 0.404 0.379 0.356 ' 0.339 0.328 0.318 0.308 0.299 0.282 0:267 0.263 0.670 0.598 0.535 0.485 0.452 0.417 0.391 0.367 0.350 0.339 0.328 0:318 0.309 0.291 0.276 0.272 0.692 0.617 0.552 0.501 0.467 0.430 0:403 0.378 0.361 0.350 0.339 0.329 0.319 0:301 0:285 0:280 0.713 0.637 0.570 0.517 0.481 0.444 0.415 0.390 0.373 0.360 0.350 0.340 0.329 0:310 0.294 0.289 0.726 0.648 0.580 6.527 0:490 0.452 0.422 0.397 0.380, 0.367 0.357 0.346. 0.335. 0.315 0.299: 0.294 0.779 0.694 0.622 0.566 0.526 0.483 0.451 0.425. 0.406 0.392 0.381 0.370 0.358 0.336 0.319 0.314 0.810 0.720 0.645 0.587 0.545 0.502 0.466 0.440 0.421 0.406 0.395 0.384 0.371 0.349 0.332 0.325 725 1