Document 9O5pXXLYB3EpD6BLkjzyJjpe

American Society of Heating and Ventilating Engineers Guide, 1932 either; cast-iron, cast-steel or .some of the steel alloys are employed. Practically all iron or steel valves intended for steam or water work are, bronze-mounted or trimmed, while valves for acids, ammonia and cocr rosive gases are of iron throughout. Pressure Requirement . Brass, bronze and iron valves are generally designed for standard or extra heavy service, the former being used up to 125 lb and the latter up to 250 lb saturated steam working pressure, although most manufac turers also make valves for medium pressure up to 175 lb steam working Table 4. Dimensions of Tees and Grosses (Straight Sizes) for 125 Lb Cast Iron Flanged Fittings [U*/Ti 3X fmm-iFb-Ar-M --A-- i 4A___ A hJL |-A-. -a-a TEE SIDE OUTLET CROSS Nominal Pipe A Center to Face Tees and Crosses b-c AA ; Face to Face Tees and Crosses b-c Diameter or Flange Thickness or Flange, Min. Metal Thickness or Bodt, Min. i iK \14 '2 2K 3 3H 4 5 6 8 10 12 14 O.D. 16 O.D. 18 O.D. 20 o.d: 24 O.D. 30 O.D. 36 o.d: 42 O.D. 48 O.D. 3K 3K 4 4H 5 5K 6 6K 7K 8 9 11 12 14 15 16K 18 22 25 28 31 34 7: 7J4 8 9 10 11 .12 13 15 16 18 .22 ' )24 ' 28 30 33 36 44 50 56 62 68 4K 4% 5 6 7 m SH... 9 10 11 13K 16 19 21 23H 25 2714 32 3854 46 53 5914 Kb He Ye : `Kb ; K' `Ks. `Kb ;1Kb 1 IK 1Kb IK m IKb 1Kb l`M6 ' iK 2H 2% -2% 2% Kb Kb Kb Y\e He y\e Kb XA. A He : K H `Kb : */8 ,1 1H6 ' iK IK . 1Kb iK 1`Kb ; 2 AH dimensions given in inches. Size of aH fittings listed indicates nominal inside diameter of .port. bTees. side outlet tees, and crosses. 16 in. and smaller, reducing on the outlet, have the same dimensions center to face, and face to face as straight size fittings, corresponding to the size of the P*P?P$- Sizes 18 in. and larger, reducing on the outlet, are made in two lengths, depending on the size of the outlet. cTees and crosses, reducing on run only, carry same dimensions center to face and face to face as a straight size fitting of the larger opening. 184 f Chapter 11--Pipe, Fittings, Valves and Pipe Welding ' pressure and cast-iron flanged valves for working pressures up to 25.1b steam. In practically all cases these valves are tested at a cold water pressure of twice the steam pressure, and may be used on cold water lines with a pressure 40 per cent in excess of the allowable rated steam pressure. Some manufacturers rate their standard valves at 150 lb steam working pressure instead of 125 lb. The more common types are gate valves or straightway valves, globe valves, angle valves, check valves and. auto matic valves, such as reducing and back-pressure valves. A special class of valves is required for controlling the steam and hot water supply to radiators. These valves are of brass, usually of the angle Table 5. Dimensions of Elbows for 125 Lb. Cast-Iron Flanged Fittings REDUCING SIOE OUTLET Nominal Pipe Size* A Bc Center to Face Elbow, b-o-d Center to Face Long Radius Elbow b-o-d Center to Face 45 Deg Elbow c . Diameter or Flange Thickness or Flange, Min. Metal Thickness or Body. Min. i IK . IK .2 214 3 3K 4 5 6 8 10 12 14 O.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D. 30 O.D. 36 O.D. 42 O.D. 48 O.D. 3K 3K 4 4K 5 5K 6 6K 714 8 9 11 12 14 15 1614 18 22 25 28 31 34 5- ` 514 6 614 7 7K 814 9 10K ni4 14 16 K 19 2114 24 26K 29 34 41K 49 56K 64 IK 4K 2. y2K 2, .3 4K 5 ?6 ... ' 3 314 7K 814 49 4 K 10 5 11 5K 13K 614 16 714 19 7K 21 8 2314 8K 25 914 27 K 11 32 15 38K 18 46 21 53 24 5914 Kb 14 Kb K `Kb K `Kb `Kb `Kb 1 IK 1Kb IK m 1Kb 1Kb 1`Kb IK 2ys 2K 2K 2K Kb Kb Kb Kb Kb Kb Kb K K Kb K K `Kb K 1 1Kb IK IK 1Kb IK 1`Kb 2 ! All dimensions given in inches. Size of all fittings listed indicates nominal inside diameter of port. ^Reducing elbows and side outlet elbows carry same dimensions center to face as straight size elbows, corresponding to the size of the larger opening. . Special degree elbows, ranging from 1 .to 45 deg, inclusive,' have the same center to face dimensions pveirin 45 deg elbows and those over 45 deg and up to 90 deg inclusive, shall have the same center to face dimensions given for 90 deg elbows.. -; The angle designation of an elbow is its deflection from straight; hne flow and is the angle between the flange faces. <*Side outlet elbows shall have all openings.on intersecting center-lines. 185 4