Page 114 - 2010-2022 hose manufactureing ability and guide

The flow of air through hose can be treated similarly to the flow The pressure loss in the charts is listed for certain volumes of free
of liquids, the main difference being the consideration for air that have been compressed to one of several gauge pressures,
compressibility of the air. then passed through the hose.
Table 11-4A and 11-4B show the relationship between rate of Example: What is the pressure loss through 100’ of 1” I.D. hose
flow, hose size and pressure loss for various operating pressures. connected to a compressor rated at 100 cubic feet per minute and
They can be used for general problems but are especially adapted 90 psi?
to problems involving air compressors. Compressors are rated in
cubic feet of free air at a certain discharge gauge pressure. Solution: On Table 11-4B, find 100 cubic feet per minute in the
top row of values. Read down that column until opposite 90 psi
in the 1” I.D. group. The pressure loss value is 2.4 psi

TABLE 11-4A
*Frictional Loss of Air Pressure in Hose
Gauge Cubic Feet Free Air Per Minute (SCFM)
2
Hose Pressure .25 .50 .75 1.0 2.0 3.0 4.0 5.0 10.0
I.D. At Line
(In.) (psi) 3 Loss of Pressure (psi) in 100’ Lengths of Hose
1
10 .12 .48 1.08
20 .09 .34 .77 1.37
30 .07 .27 .60 1.06
40 .05 .22 .49 .87 3.48
50 .05 .18 .41 .74 2.94
60 .04 .16 .36 .64 2.54
70 .04 .14 .32 .56 2.24 5.05
1/4 80 .03 .13 .28 .50 2.01 4.52 8.03
90 .03 .11 .26 .45 1.82 4.09 7.26
100 .03 .10 .23 .41 1.66 3.73 6.63 10.36
110 .02 .10 .21 .38 1.52 3.43 6.10 9.53
125 .02 .08 .19 .34 1.36 3.06 5.44 8.51
150 .02 .07 .16 .29 1.15 2.60 4.62 7.21
200 .01 .06 .13 .22 .89 1.99 3.54 5.53 22.14
10 .04 .15 .33 .60
20 .03 .11 .24 .42 1.70
30 .02 .08 .18 .33 1.32 2.96
40 .02 .07 .15 .27 1.08 2.42
50 .01 .06 .13 .23 .91 2.05 3.64
60 .05 .11 .20 .79 1.77 3.15 4.92
5/16 70 .04 .10 .17 .69 1.56 2.78 4.34
80 .04 .09 .16 .62 1.40 2.48 3.88
90 .04 .08 .14 .56 1.26 2.25 3.51
100 .03 .07 .13 .51 1.15 2.05 3.21
110 .03 .07 .12 .47 1.06 1.89 2.95 11.79
125 .03 .06 .11 .42 .95 1.68 2.63 10.53
150 .02 .05 .09 .36 .80 1.43 2.23 8.93
200 .02 .04 .07 .27 .62 1.10 1.71 6.85
10 .01 .06 .13 .23 .91
20 .04 .09 .16 .65 1.46
30 .03 .07 .13 .50 1.14 2.02 3.15
40 .03 .06 .10 .41 .93 1.65 2.58
50 .02 .05 .09 .35 .78 1.39 2.18
60 .02 .04 .08 .30 .68 1.21 1.89
3/8 70 .02 .04 .07 .27 .60 1.07 1.66 6.66
80 .02 .03 .06 .24 .54 .95 1.49 5.95
90 .01 .03 .05 .22 .48 .86 1.35 5.39
100 .03 .05 .20 .44 .79 1.23 4.92
110 .03 .05 .18 .41 .72 1.13 4.52
125 .02 .04 .16 .36 .65 1.10 4.04
150 .02 .03 .14 .31 .55 .86 3.42
200 .01 .03 .11 .24 .42 .66 2.63
Note: Losses too high for efficient
2 tool operation
*Tabulated Data based on ∆Ρ 100 = . 6 25× 10− 5× 520 × (SCFM )
P d . 5 257

∆P
100 = pressure drop/100’ hose
P = absolute pressure, psia
2
SCFM = standard ft /min of air flow
d = I.D. of hose
F
1 or longer or shorter lengths, the pressure drop is directly proportional to the given value here.
2 Free Air — 14.7 psi and 80 F.
3 These pressure drop figures are accurate for hose with smooth I.D. tube and full-flow couplings.
Greater pressure drops will occur when hose has a rough I.D. tube or restrictions at the fittings.
.

RMA/IP-2/2003 93