Document 4vLGJJJGmRaOzB7jBRZk75JYG

596 S CHAPTER 22 Table 1. Column-Type Cast-Ibon Radiator 1958 Guide Height Generally Accepted Rating per Section* One Column Two Column Three Column Sq Ft Btu/hr Sq Ft Btu/hr Sq Ft Btu/hr 15 D4 360 w18 540 m20 360 2 480 i .22 2)4 540 3 720 23 400 2H 560 26 2 480 ' -2H . . 640 .' 3M ' 900 32 2)4 600 3M 800 4)4 1080 38 3 720 4 960 5 1200 45 5 1200 6 1440 Four'C/olumn Five Column Six Column Sq Ft . Btu/hr Sq Ft . Btu/hr Sq Ft Btu/hr - 13 3 720 16 .-354 900 18 3 720 4)4 1120 Hi 1080. 20 5 1200 -22 -4 960 26 5 1200 7 1680 32 6)4 1560 38 8 1920 10 ' 2400 45 10 2400 * These ratings are .based.on steam at 215 F and air at 70 F. They apply only to installed radia tors exposed in a normal manner; not to radiators installed behind enclosures, grilles, or under shelves. For Btu per hour ratings at other temperatures, divide table values by factors found in Table 7. Table 2. Large-Tube Cast-Iron Radiators Sectional, cast-iron, tubular-type radiators of the large-tube pattern, that is, having tubes approximately 1H in- in diameter, 2)4 in. on centers. Number op Tubes per Section Catalog Rating per Section* Sq Ft Btu/hr . -Height In. Width In. SectionCenter; Spacing1* Leg Height To Tapping In. In. . . 1)4 420 20 an 4)4 ' 2M2 480 23 ' ` 2)4 " 4H 3 2)4 560 .26 4H 4)4 3 720 32 3)4 840 38 , maw 4)4 :. 4)4 2)4 540 . 20 - h2 600 23 ,, H4 2 660 26 ` 34)H4 840 1020 32 38 2mmH 4)4 4)4 4)4 2)4 4)4 2)4 640 20 mi Hi 3 720 ' 23 4)4 H5 3}* 840 26 8-8H 2^1 4)4 4 1040 ` 32 4)4 5 1200 38 . 2Hd 4)4 26 3 720 20 ' 3)4 840 23 2tf 4 960 26 9-IOH 2H 5 1200 32 . * . 2a 6 1440 38 2H Hi 4)4 4)4 4)4 4)4 2)4 600 14 7 3 720 17 3M ' 880 20 2H ... 2M 2W 3 33 or 4)4 "These ratings are based .on-steam at 215 F-and air at 70 F. They apply-only, to installed radia tors exposed in a normal maimer; not'to radiators installed behind enclosures, grilles, or under snei For Btu per hour ratings at other .temperatures; divide table values'by factors found in Table 7. h Maximum assembly 60 sections.- Length equals number of sections times 2H in. e Where greater standard leg heights are required, thisdimension shall be 6 in., except for 7-tub sections, in heights from 13 to 20 in., inclusive, for which this dimension shall be 4)4 in. Radiators may furnished without legs. d For 5-tube hospital-type radiation, this dimension is 3 in. Radiators, Convectors, Baseboard and Finned Tube Units 597 hr (Btuh), 1000 Btu per hr (Mbh), or in square feet equivalent direct radi ation (EDR) (e.g., 240 Btuh for steam = 1 sq ft EDR). . . RADIATORS Column and large-tube radiators are no longer manufactured, but since many of these units are still in use, Tables 1 and 2 are included to provide principal dimensions and average ratings. The small-tube type radiators, with a spacing of If in. per section, occupy less space than the older column and large-tube radiators, and are particu larly suited for installation in recesses. After a study of the demand for various sizes of radiators, the Institute of s Table 3. Small-Tube Gast-Iron Radiators Number op Tubes per Section Catalog Rating ' PER Section* Section Dimensions AB C Width Height Spacing1* Minimum Maximum D Leg Height Sq Ft Btu/hr In. In. In.- In. In. 8O 3d 1.6 384 25 m m 1H . 2H 4d 1.6 1.8 ' 384 432- . 19 22 4M 41M m 4^fl m 2)4 2)4 2.0 480 25 4M m 2H 5d 2.1 504 22 5)4 6M m. 2)4 2.4 576 25 5)4 6M 2.3 552 19 6'M 8 3.0 720' 25 6M 8 3.7 888 32 . 6>M 8 1)4 2H 1)4 2)4 1)4 2)4 1)4 . 2H i "i inlii These ratings are based on steam at 215 F and air at 70 F. They apply only to installed radia tors exposed in a normal manner; not to radiators installed behind enclosures, grilles, or under shelves, or Btu per hour ratings at other temperatures, divide table values by factors found in Table 7. Length equals number of sections times in. _ Overall height and leg height, as produced by some manufacturers, are one inch greater than shown m Columns A and D. Radiators may be furnished without legs. Where greater than standard leg heights are required this dimension h.n be 4)4 in. d Or equal. Boiler and Radiator Manufacturers, in cooperation with the Division of Simplified Practice, National Bureau of Standards, established Simplified Practice Recommendation R174-47, Cast Iron Radiators, for small-tube cast-iron radiators. Table 3 shows the size and dimensions now being manufactured. Yradiators are hung from wall brackets and are well adapted to use m tactory buildings. Tests have shown that the heat emitted from a wallype radiator may be reduced from 5 to 10 percent if the radiator is placed ceed' with the bars horizontal and in an air temperature exInstallation of wall radiators at the ceiling is not recom- anH u- ecause the resulting large temperature gradients between floor sion C61"j1f. ma^e *.t difficult to heat the living zone satisfactorily. Dimen... .an<l neat emission rates of wall radiators for normal wall installations are given m Table 4. Pipe Coils undffe C'^S 416 sometimes used in factory buildings and are usually placed nirvD r w,mdows or along heavily-exposed walls. The heat emission of such Pipe coils may be obtained from Table 5.