Pipe Sizing Tables

The following table is expressed as imperial values. To view this page in SI metric units, click here.Steam Pipe Capacity at 30 psig - Schedule 40 Pipe

Pipe Size

Pressure drop per 100 ft of pipe length

(IN)

1/8

1/4

1/2

3/4

1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12

7
16
32
70
110
223
368
675
990
1,420
2,625
4,315
9,000
16,400
26,350

10
22
45
99
156
316
520
953
1,405
2,020
3,720
6,100
12,700
23,200
37,250

14
32
64
142
220
446
735
1,340
2,010
2,850
5,260
8,650
18,000
33,300
52,500

17
39
79
174
270
546
900
1,652
2,470
3,490
6,450
10,600
22,000
40,250
64,500

19
45
91
202
312
630
1,040
1,905
2,850
4,025
7,450
12,200
25,420
46,500
74,500

28
64
129
283
440
892
1,472
2,690
4,020
5,700
10,550
17,300
36,000
65,750
105,500

Click on the red dots for more information.

Above

Velocities Less Than

Violet

Yellow

Blue

Red

Green

6,000 fpm

8,000 fpm

10,000 fpm

12,000 fpm

15,000 fpm

Each of these tables lists pipe capacity at specific supply pressures.

The flow rate is read at the intersection of the size and pressure drop.

The color coding on the chart provides information on the flow velocity within the pipe at the rated flow. All velocities in any colored area are less than the maximum listed for the color.

The pressure drop per 100 ft of pipe length is listed across the top row.

Various pipe diameters (for schedule 40 pipe) are listed down the left column.

The pressure drop per 100 ft of pipe length
is listed across the top row.