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American Society of Heating and Ventilating Engineers Guide, 1928 riser as given in Column K and not Column G, determines the size of some sections of the riser. Part of System Riser D U U ** ** Branch Section of Pipe /to S t to / 4 to c c to d b to c o to 6 to Riser D Radiation Supplied, Sq. Ft. 200 300 400 500 600 700 700 Pipe Size, Inches 2 2 2H 2H .3 3 Size riser C in manner similar to that used for riser D. The equivalent length of run from the source of steam supply A to the farthest radiator supplied by main BF (or the radiator on floors g riser F) is between 400 and 500 ft.--therefore size the entire run from B to top of riser F, according to Column F, Table 16, observing Note 4 as regards maximum capacity of up-feed supply risers given in Column K. Part of System Riser F u U II u m "" Branch Main Section of Pipe- / tog e tof d to e e to d b to c a to b to Riser F B to F Radiation Supplied, Sq. Ft. 400 600 800 1000 1200 1400 1400 1600 Pipe Size. Inches 2H 2H 3 3 3H 3H 4 3K The equivalent length of run from the farthest radiator served by any return main (or that on floor g return riser G) to the vacuum pump is between 600 and 800 ft.-- therefore size entire run according to Column U. Part of System ReUturn. RiUser CU aa u aa u aa u au Branch Return Main ua U II Section of Pipe g to/ /to to d d to c c to b b to c to Return Riser G G to H H to J / to / J to L Radiation Served, Sq. Ft. 400 600 800 1000 1200 1400 1400 1600 2400 3200 4800 Pipe Size. Inches X H 1 1 1 \y< in IK 2 2 2H The equivalent length of run from the farthest radiator served by return riser H to the vacuum pump L is between 500 and 600 ft.--therefore size return riser H accord ing to Column T. Part of System Return Riser H u aa u av a aa Branch Section of Pipe e to/ / to e e to d d to c c to b 6 to a to Return Riser H s Radiation Served. Sq. Ft. 200 300 400. 500 600 700 700 Pipe Size. Inches X X X^ X' X X 1 The equivalent length of run from the farthest radiator served by riser / to the vacuum pump is between 300 and 400 ft.--therefore size that riser according to ColumriH?. Size the return riser / in a manner similar to that used for riser H. 108 Chapter III--Steam Heating Systems and Piping if JgMgL ^LJgL JglJgL Igli JtfJX JgU JtEl Si JE3,- R jHE-- JE~L SU JEl J3U J5L J3L JE~L $:JQ Q+ JEL &, JS jgiJjgL J3iL! % 4kU iii -4ktoo 1 too 1 too 1 v N-- Source o/SfeamSo&o/y A&~xSL - /OO* * Vacuum tp Fig. 8 Layout of Vacuum Pump System The equivalent length of run from the farthest radiator served by return main JK to the vacuum pump is between 400 and 500 ft.--therefore size entire run from top of return riser K to J according to Column 5. Part g* ' System Return u Riser Ku mu u au u ua u mu Branch Return Main Section of Pipe t to/ to Return Riser 'K K to J Radiation Served, Sq. Ft. 400 600 800 1000 1200 1400 1400 1600 Pipe Size, Inches X 1 1 1 l IX IX RESULTS OF LABORATORY EXPERIMENTS The Research Laboratory of the American Society, of Heating and Ventilating Engineers has investigated this subject1, and has found the limiting velocity for one and two-pipe risers (that is where all the `Reports by Houghten, Ebin & O'Connell, Transactions, American Society or Heating and Ventilating Engineers. Vols. 28-33, inclusive. 109