Document p2pOMgDG0NL88vydDazGv8MjB

American Society of Heating and Ventilating Engineers Guide, 1934 II l 1 --/ . 1 1^ 1 1_ 1 t f '! t it 1 / (a) 1\ Supply .Supply 11 . Supply t1 J C&o3aO.. ^ tI 1 t 1 i T 1 1 / (6) g| 1 1 1 S1 i I1 1 1 /> yL<> 1 -^ y I >s a. CC3OL --> 1 \ aa3>*. 00 1 i1 1 Tf / /<? <c) Fig. 6. Methods of Arranging Hot Water Circulation Lines water risers which do not have the combined up- and down-travel which the hot water must make. In the third and most common arrangement all of the water is carried from the tank or heater directly to the top of the building and is there distributed to the risers which are down-feed and may be sized in the regular down-feed manner if the total equivalent run either from the street main or house tank is taken into consideration. The return circulation lines from the botton of each riser should be arranged in the manner already outlined and any riser not going to the basement to Table 9. Summary of Riser Sizes to Give Main Sizes Riser No. 1 Fixtures GPM PER Fixture 12 W. C. 6 U. 18 31 Fixt. 50 40 29 W. C. 5 U. 50 40 52 2 29 Fixt. 60 6 W..C. 50 58 10 Fixt. 3 70 Riser GPM 600 240 840 186 1450 200 2490 177 363 300 2790 . 36 - --- 399 Probable Use (Per Cent) Probable GPM Allowable Drop (Lb per 100 Ft) Size op Main (Inches) 18 151 37 69 220 3.3 4 8 199 33 120 319 3.3 4 7 195 33 131 326 3.3 4 562 Chapter 39--Water Supply Piping Table 10. Typical Calculation of Pipe Sizes on Up-Feed Riser with Flush Valve Water-Closets and Urinals Floor of Bldg. Fixtures on Floor Gras PER Fixt. Max. Fixt. GPM tProbable Use (per cent ) iProbabli Fixt. GPM Probable Riser GPM Allowable Drop (Lb per 100 ft) Pipe Size In. 8th 4 W. C. 2 U. 6 3 Lav. 7th 4 W. C. 2 U. , 12 3 Lav. 6 6th 4 W. C. 2 U. 18 3 Lav. 9 5th 4 W. C. 2 U. 24 3 Lav. 12 4th 24 W. C.* and U. 10 Lav. 22 3rd 24 W. C.* and U. 1 S. S. 23 2od 24 W. C. and U. 1 S. S. 24 1st 24 W. C. and U. 1 S. S. 25 Prom floors above. 50 40 3 50 40 3 50 40 3 50 40 3 3 4 4 4 Riser No. 1 200 80 280 9 200 80 560 9 18 200 80 840 9 27 200 80 1120 9 36 40 80 25 55 18 50 15 47 112 7 119 140 10 150 151 14 165 16S 17 185 1120 15 30 66 40 168 27 195 1120 4 70 15 40 168 28 196 1120 15 4 74 40 168 30 198 1120 4 78 15 40 168 31 199 8.5 8.5 8.5 2 8.5 3 8.5 3 8.5 3 8.5 3 8.5 3 " ---------------------- ---- Y /i