MIL-HDBK-1003/8A
Change 2, 30 December 1991
Table 10
Return Pipe Capacities for 30 psig (206.7 kPa) Steam Systems (a)
(Capacity Expressed in lbs/hr)
DROP IN PRESSURE (psi PER 100 ft IN LENGTH)
PIPE SIZE
1/8
1/4
1/2
3/4
1
(in.)
3/4
115
170
245
308
365
1
230
340
490
615
730
1-1/4
485
710
1,025
1,290
1,530
1-1/2
790
1,160
1,670
2,100
2,500
2
1,580
2,360
3,400
4,300
5,050
2-1/2
2,650
3,900
5,600
7,100
8,400
3
4,850
7,100
10,300
12,900
15,300
3-1/2
7,200
10,600
15,300
19,200
22,800
4
10,200
15,000
21,600
27,000
32,300
5
19,000
27,800
40,300
55,500
60,000
6
31,000
45,500
65,500
83,000
98,000
(a) Based on 0-4 psig maximum return pressure.
Table 11
Return Pipe Capacities for 150 psig (1033.5 kPa) Steam Systems (a)
(Capacity Expressed in lbs/hr)
DROP IN PRESSURE (psi PER 100 ft IN LENGTH)
PIPE SIZE
1/8
1/4
1/2
3/4
1
2
(in.)
3/4
156
232
360
465
560
890
1
313
462
690
910
1,120
1,780
1-1/4
650
960
1,500
1,950
2,330
3,700
1-1/2
1,070
1,580
2,460
3,160
3,800
6,100
2
2,160
3,300
4,950
6,400
7,700
12,300
2-1/2
3,600
5,350
8,200
10,700
12,800
20,400
3
6,500
9,600
15,000
19,500
23,300
37,200
3-1/2
9,600
14,400
22,300
28,700
34,500
55,000
4
13,700
20,500
31,600
40,500
49,200
78,500
5
25,600
38,100
58,500
76,000
91,500
146,000
6
42,000
62,500
96,000
125,000
150,000
238,000
(a) Based on 1-20 psig maximum return pressure.
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