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Heating Ventilating Air Conditioning Guide 1939 Table 13. Coefficients of Transmission (17) 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 Thickness Insuolartion (Inches) Nominal Pip Sees (Inches) Vi Vi l l Vi l Vi 2 Hi 3 i Hi 4 Hi 5 6 8 10 12 Vi Vi 1 ; Hi Hi 2 m 3 Hi 3Vi <4 4M 5 6 8 10 12 Vi Vi 1 Hi m 2 2Vi 3 2 3Vi 4 4Vi 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 0.755 0.674 0.607 0.553 0.517 0.481 0.453 0.429 0.412 0.400 0.390 0.380 0.369 0.351 0.337 0.332 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 Hot Water ISO F 180 P 210 F 227.1 F (5 Lb) Temperature Difference 80 F no f 140 F 157.1 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 0.767 0.685 0.618 0.562 0.527 0.490 0.460 0.436 0.419 0.407 0.396 0.386 0.375 0.358 0.344 0.338 0.780 0.697 0.628 0.572 0.536 0.499 0.469 0.444 0.427 0.415 0.402 0.393 0.382 0.364 0.350 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 0.675 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 Steam 297.7 F (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 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 0.732 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 0.296 337.9 F (100 Lb) 267XF 1.022 0.921 0.840 0.771 0.731 0.685 0.651 Of. 626 0.604 0.589 0`. 575 0.565 0.553 0.532 0.514 0.507 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 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 0.302 744 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) NoPmipineal She (Inches) Vi Vi 1 Hi Hi 2 4 2Vi 3 1 3Vi 4 4Vi 5 6 8- 10 12 Vi Vi 1 . Hi 1 Vi 2 tVi 3 lVi 3Vi 4 4Vi 5' 6 '8 10 12 Vi Vi 1 Hi Hi 2 2Vi 3 2 3Vi 4 4Vi 5 6 8 10 12 120 F 50F 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 ISO F 180 F 210 F 227.1 F (S Lb) Temperature Difference 80 F 110 F 140 F | 1S7.1 F 0.644 0.581 0.529 0.486 0.460 0.431 0.411 0.394 0.381 0.371 0.363 0.356 0.348 0.335 0.324 0.320 0.658 0.593 0.541 0.497 0.470 0.441 0.420 0.402 0.389 0.379 0.371 0.364 0.356 0.342 0.331 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 Stram 297.7 F (SO Lb) 337.9 F (100 Lb) 227.7 F 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 0.355 267.9 F . 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 6.383 0.359 0.333 0.314 0.296 0.286 0.278 0:270 0.263 0.257 0.244 0.235 0.230 0.534 0.477 0.430 0.391 0.366 0.340 0.320 0.302 0.291 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 0.265 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 0.463 0.415 0.377 0.351 0.323 0.302 0.284 0.272 0.262 0.255 0.247 0.239 0.225 0.214 0.210 0.534 0.475 0.427 0.387 0.360 0.331 0.310 0.292 0.280 0.269 0.262 0.253 0.245 0.231 0.220 0.216 745