Page 579 - Air and Gas Drilling Manual

pp
L
12
L pp l 0 667 ft Chapter 11: Specialized Drilling Equipment 11-17
.
pp
Over the length of the passages the surface roughness is
e p 0 00015 ft
.
With the above, Equation 6-73 becomes
2

1
f
ipp 0 0521
.
.
2 log 114
.
0 00015
.
f ipp 0 026
Equations 6-67 and 6-68 become, respectively,
.
10
a
ipp
53 36
.
.
a ipp 0 019
and
2
2
2 635)
(.
2
.
.
0 026 53 36 3
b ipp
(
232 2 . ) 10 . 2 5
(.
0 0521)
4
b ipp 14 910 000
,
,
Equation 6-72 becomes