60

1.6012

VD" = 9.44 X 1.601 = 15.2 ft/s X in V = 13;6„ X 3.54 = 2.88 m/s

4.0892

VD = 2.88 X 0.04089 = 0.118 m/s X m (VD" = 0.118 X 129.2 = 15.2 ft/s X in) From Figure 33, Re = 1.5 X 104, and from Figure 31, f = 0.030. From Eq. 16

300 X 12 9.442 in USCS units hfd = 0.030 X 2 Xg4.17 = 9.29 ft

91.5 2.882

in SI units hfd = °.°3° 004089 X 2X9807 = 28.39 m

The valve and fitting losses from Tables 5 and Eq. 20 are 2-in (51-mm) bellmouth, K = 0.05:

In USCS units In SI units

In SI units

2-in (51-mm) gate valve, In USCS units

5.732

hf1 = 0.05 2X321T

1.752

u 5.732

0.026 ft 0.0078 m

In SI units

1g-in (38-mm) gate valve, In USCS units

In SI units

1^-in (38-mm) swing check valve, In USCS units

In SI units

1 752

9.442

The total pipe, valve, and fitting losses are

In USCS units nhf = hfs + hfd + hfi + hf 2 + hf 3 + hf4 + hf5

= 1.84 + 92.9 + 0.026 + 0.48 + 0.082 + 0.263 + 3.46 = 99.05 ft Total variation = ± (0.14 + 0.021 + 0.066 + 1.0) = ± 1.23 ft nhf = hfs + hfd + hf1 + hf 2 + hf 3 + hf4 + hf

= 0.56 + 28.39 + 0.0078 + 0.044 + 0.0250 + 0.0803 + 1.06 = 30.17 m Total variation = ± (0.044 + 0.0062 + 0.02 + 0.32) = ± 0.39 m example 13 Solve Example 12 using resistance coefficients from Tables 6.

Suction pipe:

In SI units

In USCS units In SI units

Discharge pipe,

In USCS units In SI units

(same as in Example 12) (same as in Example 12)

(same as in Example 12) (same as in Example 12)

Valve and fitting losses from Tables 6 and Eq. 20: 2-in (51-mm) bellmouth, K = 0.04

5.732

In USCS units In SI units

2-in (51-mm) SR 90° elbow, In USCS units h1 = 0.04 2X3217 = 0.020 ft

1.752

hf1 = 0.04 ^XSTSÔT = 0.0062 m K = 30 fT fT = 0.019

(from Table 6A)

fs fs

In SI units

In USCS units In SI units

In USCS units

In SI units h

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Renewable Energy 101

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