Metal Pipe Table 8. Ductile Iron Pipe Specifications Machinery's Handbook, 31st Edition
2766
Pressure Class, psi Special Thickness Class 150 200 250 300 350 50 51 52 53 54 55 56 Nominal Wall Thickness, inch Nominal Wall Thickness, inch
Outside Diameter inches
Nom. Size
3 3.96 … … … … 0.25 … 0.25 0.28 0.31 0.34 0.37 0.40 4 4.80 … … … … 0.25 … 0.26 0.29 0.32 0.35 0.38 0.41 6 6.90 … … … … 0.25 0.25 0.28 0.31 0.34 0.37 0.40 0.43 8 9.05 … … … … 0.25 0.27 0.30 0.33 0.36 0.39 0.42 0.45 10 11.10 … … … … 0.26 0.29 0.32 0.35 0.38 0.41 0.44 0.47 12 13.20 … … … … 0.28 0.31 0.34 0.37 0.40 0.43 0.46 0.49 14 15.30 … … 0.28 0.30 0.31 0.33 0.36 0.39 0.42 0.45 0.48 0.51 16 17.40 … … 0.30 0.32 0.34 0.34 0.37 0.40 0.43 0.46 0.49 0.52 18 19.50 … … 0.31 0.34 0.36 0.35 0.38 0.41 0.44 0.47 0.50 0.53 20 21.60 … … 0.33 0.36 0.38 0.36 0.39 0.42 0.45 0.48 0.51 0.54 24 25.80 … 0.33 0.37 0.40 0.43 0.38 0.41 0.44 0.47 0.50 0.53 0.56 30 32.00 0.34 0.38 0.42 0.45 0.49 0.39 0.43 0.47 0.51 0.55 0.59 0.63 36 38.30 0.38 0.42 0.47 0.51 0.56 0.43 0.48 0.53 0.58 0.63 0.68 0.73 42 44.50 0.41 0.47 0.52 0.57 0.63 0.47 0.53 0.59 0.65 0.71 0.77 0.83 48 50.80 0.46 0.52 0.58 0.64 0.70 0.51 0.58 0.65 0.72 0.79 0.86 0.93 54 57.56 0.51 0.58 0.65 0.72 0.79 0.57 0.65 0.73 0.81 0.89 0.97 1.05 60 61.61 0.54 0.61 0.68 0.76 0.83 … … … … … … … 64 65.67 0.56 0.64 0.72 0.80 0.87 … … … … … … … Casting Tolerances : Sizes 3 to 8, 0.05 inch; sizes 10 to 12, 0.06 inch; sizes 14 to 42, 0.07 inch; size 43, 0.08 inch; sizes 54 to 64, 0.09 inch. Table 9. Temperature Coefficient, Y
Temperature
≤ 900 °F ≤ 482 °C
950 °F 510 °C
1000 °F 538 °C
1050°F 566 °C
1100 °F 593 °C
1150 °F 621 °C
1200 °F 649 °C
1250+°F 677+ °C
Material
Cast Iron Nonferrous Ferritic Steel Austenitic Steel Nickel Alloys: N06617, N08800, N08810, N08825
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0.4 a 0.4 a
0.5 0.4 0.4
0.7 0.4 0.4
0.7 0.4 0.4
0.7 0.5 0.4
0.7 0.7 0.4
0.7 0.7 0.5
0.7 0.7 0.7
0.4
D i D i D o + = ---------- .
a If D
o ÷ t < 6, calculate Y
Face (RF), and Flat Face (FF). RTJ facings use ring type metal gaskets and are for the most severe duties, such as with high pressure gas piping. Raised face flanges have a nonmetal lic gasket that fits within the bolts of the flange. The face has a series of grooves into which the gasket flows upon compression. A flat face flange also uses a series of grooves, but the nonmetallic gasket fits over the entire face of the flange. Flat face flanges are used for the lowest pressure duties. The way in which the flange is attached to the pipe determines the flange type. Weld-Neck (WN) flanges are butt-welded to the pipe, and are used on high pressure and hazardous applications. Socket Weld (SW) flanges are fillet welded onto the pipe and are also suitable for high pressures, but are limited to pipe sizes of 1 1 ⁄ 2 inch or less. Slip-On Weld (SO) flanges are used for low pressure, low hazard applications. The pipe is welded both to the hub and the bore of the flange. This weld configuration makes it impractical to radiographically inspect the welds. Composite lap joint flanges are used to save material expense on alloy pipe systems, where a backing flange of an inexpensive material is added to a hub welded to the pipe. Swivel ring flanges, like composite lap joint flanges, use a hub welded to the
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