MIL-HDBK-1003/8A

a) Steam Flow Charts. For pressures of 30 psig (206.7 kPa),

50 psig (344.5 kPa), 100 psig (689.4 kPa), and 150 psig (1033.5 kPa), see

Figures 3 through 6. These charts show weight-rate pressure drop and

velocities of saturated steam in Schedule 40 steel pipe. By selecting all

pipe sizes on an optimum pressure drop, the total pressure drop of a pipeline

may be estimated from an equivalent length, irrespective of pipe size. The

charts are based on the rational flow formula (Darcy) shown below. For higher

pressures, refer to Piping Handbook, by Crocker and King.

b) Rational Flow Charts. The simplified rational flow formula

(Darcy) is used for compressible fluids for all pressures:

EQUATION:

P100 =

W2(0.000336f) v/d5 = C1 x C2 x v

(2)

Where:

P100 = pressure drop per 100 feet of equivalent length of pipe

(psi)

C1

= W210-9

(for values, see Figure 7)

C2

= 336000f/d5

(for values, refer to Table 8)

W

=

rate of flow, pounds per hour (pph) (0.454 Kg/h)

f

=

friction factor

d

=

inside diameter of pipe (in)

v

=

specific volume of fluid (ft3 per lb) at average pressure

c)

Velocities.

(Refer to Table 9.)

EQUATION:

3.06W

V =

(3)

d2

Where:

V

=

velocity of flow (fpm)

R

=

density (pcf)

30

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