Page 616 - Air and Gas Drilling Manual

11-54 Air and Gas Drilling Manual
1 750 ft
.
Over the length of the drive shaft passage the surface roughness is
e L sp 0 00015 ft
.
p
With the above, Equation 6-73 becomes
2
1
f isp 0 125
.
.
2 log 114
.
0 00015
f isp 0 021
.
Equations 6-67 and 6-68 become, respectively,
.
10
a isp
.
53 36
a 0 019
.
isp
and
2 2
.
.
2 635)
0 021 53 36 (.
b isp 2
232 2 . ) 10 . 5
(
0 125)
(.
4
,
b 334 500
isp
Equation 6-72 becomes
. 05
2 (. 0 019 ) ( . 1 750 )
2 2
. )
,
31
(,330 ) (334 500 ) (604 41 e 604 .41 1
P
isp
2 (. 0 019 ) ( . 1 750 )
e 604 .41
2
P isp 31 540 lb/ft abs
,