Xylem Bell & Gossett Hoffman Speciality Series, Инженерный справочник данных

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Steam Flow in Pipes
15
REASONABLE VELOCITIES for fluid flow through pipes
Pipe Size, Inches
1
⁄
2
3
⁄
4
1 1
1
⁄
4
1
1
⁄
2
2 2
1
⁄
2
3 3
1
⁄
2
4 4
1
⁄
2
5 6 7 8 9 10
Capacity Factor 2.0 3.5 5.5 10.0 13.5 22.5 31.5 48.5 65.0 84.0 105. 131.5 190. 255. 329. 430. 539.
COMPARATIVE CAPACITIES of different sizes of pipe
STEAM PRESSURE PSI (Gauge)
Pounds Condensed Per Hour, Per Lineal Foot of Pipe
1 2 4 6 8 10 20 30 40 50 75 100 125 150 200
.11 .13 .14 .14 .15 .15 .16 .18 .20 .22 .26 .29 .32 .35 .40
.15 .15 .16 .16 .17 .18 .20 .23 .25 .27 .31 .35 .39 .42 .49
.21 .21 .22 .23 .23 .24 .28 .33 .36 .39 .45 .50 .55 .60 .69
.24 .25 .26 .27 .27 .29 .33 .38 .42 .46 .54 .61 .68 .74 .81
.30 .31 .32 .33 .34 .36 .41 .46 .51 .55 .65 .73 .81 .88 .97
.38 .39 .40 .41 .43 .44 .50 .56 .61 .66 .77 .86 .94 1.03 1.19
.46 .47 .48 .49 .51 .53 .61 .68 .76 .83 1.04 1.11 1.23 1.33 1.50
.55 .56 .59 .60 .62 .64 .74 .83 .91 1.00 1.24 1.32 1.46 1.59 1.81
.34 .35 .36 .37 .39 .41 .47 .53 .59 .65 .73 .81 .90 1.00 1.15
CONDENSATION RATES at 70°F. (for bare steel pipe with natural movement of air)
Pipe
Size
(Inches)
3 ⁄
4
1
1
1 ⁄
2
2
2
1 ⁄
2
3
4
5
Per Sq. Ft.
Heat. Surface
Sq. Ft. of
Surface =
to 1 Lineal
Ft. of Pipe
.275
.345
.497
.622
.752
.917
1.179
1.459
EXAMPLE: To get size of pipe to serve a 1 ⁄
2
" and 3 ⁄
4
" pipe, add factors: 1 ⁄
2
" factor (2) + 3 ⁄
4
" factor (3.5) = 5.5 (1" factor).
Condensation in Pipes
Fluid Pressure PSI (Gauge) Service Velocities—FPM
SATURATED STEAM 0-15 Heating Mains 4000-6000
SATURATED STEAM 50-up Miscellaneous 6000-8000
SUPERHEATED STEAM 200-up Turbine and Boiler Leads 10000-15000
WATER 25-40 City Service 120-300
WATER 50-150 General Service 300-600
WATER 150 Boiler Feed 600
Pipe Size
PRESSURE PSI (GAUGE)
(Inches) 5 10 15 30 50 75 100 125 200 250
1 ⁄
2
30 40 45 60 90 120 150 180 270 330
3 ⁄
4
55 70 80 110 160 220 280 340 510 620
1 90 110 125 180 270 390 460 560 840 1020
1 1 ⁄
4
160 200 225 325 480 650 820 990 1490 1830
1
1
⁄
2
220 270 300 450 650 900 1100 1300 2060 2550
2 370 455 520 750 1100 1500 1900 2300 3450 4200
2
1
⁄
2
525 650 750 1050 1600 2175 2750 3300 4950 6050
3 800 950 1350 1600 2500 3350 4250 5150 7700 9450
3 1 ⁄
2
1100 1350 1550 2200 3300 4550 5700 6900 10200 12700
4 1450 1800 2000 2900 4300 5850 7400 8900 13450 16400
5 2300 2800 3200 4600 6900 9300 11700 14100 21200 26000
6 3200 3900 4500 6400 9800 13200 16800 20300 30800 36900
8 5700 7000 8000 11400 17200 23300 29300 35400 53100 65200
10 9300 11400 13000 18900 28200 38000 48100 58100 87100 106500
12 13500 16600 18900 27000 40800 55300 69700 84200 126500 154700
SATURATED STEAM (lbs/hr) at 6000 ft/min (velocity) in iron or steel pipe
DIAMETER OF PIPE IN INCHES
3 ⁄
4
1 1
1 ⁄
2
2 2
1 ⁄
2
3 4 5 6 8 10 12
2 3 3 4 4 5 6 7 8 11 13 15
2 3 3 4 4 5 6 7 9 11 14 15
3 3 4 4 5 5 6 7 10 12 14 17
3 3 4 4 5 5 7 9 11 13 15 18
3 3 4 5 5 5 8 10 12 15 18 21
3 4 5 5 6 7 9 11 13 16 20 24
CONDENSATION (lbs/hr) per 100 ft. pipe with 2-in. thick 85% magnesia insulation
Pressure
PSI
(Gauge)
1
3
5
10
20
30
DIAMETER OF PIPE IN INCHES
3 ⁄
4
1 1
1 ⁄
2
2 2
1 ⁄
2
3 4 5 6 8 10 12
4 4 5 6 7 9 11 13 16 19 24 28
4 5 6 7 8 10 13 15 18 22 27 32
5 5 7 8 9 12 15 18 20 25 31 37
5 6 7 8 9 13 16 19 22 28 35 41
6 6 8 9 10 14 17 21 24 31 38 45
6 7 8 9 11 15 19 24 28 35 44 51
Pressure
PSI
(Gauge)
50
70
100
125
150
200
Condensation in 3" and larger pipe are corrected for heat loss due to friction. Velocity taken at 8000 ft./min. Based on standard formulas.