Document jyJwYdqeejVzExRp1oY9K2jyZ

Heating Ventilating Air Conditioning Guide 1939 i i i Ii Tt^00000000 O'OO'OO'-'-'-iMMO OO n-i CM fO 4OXJ0 i:jII OOOQO Cw-iMOoOi -Oo oO v-l fO ooin j j is* xs: ^ X 55 190 450 990 1,500 3,000 190 570 ....... 450 976 ....... 990 1,547 ....... 1,500 3,256 ....... 3,000 5,453 ........ 8.710 ....... 13,0201....... ! 17.910 ____ 50,450| ....... 700 1,200 1,900 4.000 6,700 10.700 16.000 22,000 38.700 62,000 190 450 990 1,500 3,000 190 1.400 450 2.400 990 3,800 1,500 8,000 3,000 13.400 21.400 32.000 44.000 77.400 124,000 1,977 3,390 5,370 11,300 18,925 30,230 45,200 62,180 109,300 175,100 1 AH tmaeiirim jc.anP ipSioncoieatnyd oMp rHCeaa tnidnitiom ianndQ CVoenntrtialctaotrinNg atEionngialneAettroseia'iion 7 xN,-o t t o b o, R e p r , n t o d W i t h o u t S p e c ia l oP _e_r__m_ i<s. .s ii_o__nf Chapter 16. Piping for Steam Heating Systems 3 For up-feed steam risers carrying condensation backfromtheradiators, use Column J. 4 For down-feed systems the main risers of which do not carry any radiator con densation, use Column H. 5 For the radiator valve size and the stub connection, use Column K. g For the dry return main, use Column U. 7 For the wet return main use Column T. On systems exceeding an equivalent length of 200 ft, it is suggested that the total drop be not over x/i lb. The return piping sizes should correspond with the drop used on the steam side of the system. Thus, where ii4-lb drop is being used, the steam main and dripped runouts would be sized from Column C; radiator runouts and undripped riser runouts from Column L; up-feed risers from Column J; the main riser on a down-feed system from Table 10. Pipe Sizes foe One-Pipe Up-feed System Shown in Fig. 2 Pabt or System Section or Pipe Branches to radiators.. Branches to radiators.. Pirrr Riser............... ................ Riser............................... Riser--......... Riser............................... Branch to riser...-:........ Supply main................. Branch to supply main Dry return main.......... Wet return main.......... Wet return main.......... Wet return main.......... ____ a to b b to c c to d d toe e to / / tog g to h h to j f to k k to m m to n n to p Radiation Supplied (Sq Ft) Tbeo&btical Pipe size (Inches) Practical Pipe size (Inches) 100 2 2 50 200 2IK 2IK 300 m 2 K 400 2K 500 3 3 .600 3 3 600 3 H 3K 600 3 3 600 3 600 IK 2 600 1 2 600 1 2 600 1 2 Fig. 2. Riser, Supply Main and Return Main of One-Pipe System Column C (it will be noted that if Column H is used the drop would exceed the limit of K4 lb); the dry return from Column R; and the wet return from Column Q. With a %-lb drop the sizing would be the same as for lb except that the steam main and dripped runouts would be sized from Column B, the main riser on a down-feed system from Column B, the dry return from Column 0, and the wet return from Column N. ' Size the one-pipe gravity steam system shown in Fig. 2 assuming that this is all there is to the system or that the riser and run shown involve the longest run on the system. Solution. The total length of run actually shown is 215 ft. If the equivalent length oi run is taken at double this, it will-amount to 430 ft, and with a total drop of M lb tne drop per 100 ft will be slightly less than Me lb. It would be well in this case to use 724 lb, and this would result in the theoretical sizes indicated in Table 10. These theo-