Page 343 - Air and Gas Drilling Manual

8-26 Air and Gas Drilling Manual
For this example, the length of the blooey line, L b, is
= 200 ft
L
b
The inside diameter of the blooey line, D b, is
d = 8 097 inches
.
b
d b
D b =
12
.
D = 0 668 ft
b
The blooey line is fabricated of commercial steel pipe, therefore, the inside surface
roughness is
e p = 0 00015 ft
.
The Fanning friction factor for flow in the blooey line is determined from

  2
 
 1 
f b =   (8-4)
  D  
b
+1 14


 2 log. 
   e   
p
Equation 8-4 becomes
  2
 
f =  1 
b   0 668  
.
2 log   +114 
.
   0 00015   
.
.
f b = 0 014
The inside cross-sectional area, A b, of the blooey line is
π
A b =   D b 2
 
4