156
JT920/JT920L - APPENDIX
B. ENTRY PITCH, SETBACK, AND DEPTH
156
JT920/JT920L - APPENDIX
B. ENTRY PITCH, SETBACK, AND DEPTH
B. ENTRY PITCH, SETBACK, AND DEPTH
Entry pitch, setback, and depth work together with bend limits to
determine bore path. Entry pitch is drilling unit slope compared to
level ground. Setback is distance from entry to horizontal.
Minimum depth is measured at point bore becomes horizontal.
JT920 Power Pipe Drill Pipe
EA
SB
d
D
-18
24 ft 9 in (7.54 m)
1 ft 1 in (.34 m)
2 ft 9 in (.84 m)
-20
26 ft 9 in (8.14 m)
1 ft 3 in (.37 m)
3 ft 3 in (1.00 m)
-22
28 ft 8 in (8.74 m)
1 ft 4 in (.41 m)
3 ft 10 in (1.16 m)
-24
30 ft 7 in (9.32 m)
1 ft 6 in (.44 m)
4 ft 4 in (1.33 m)
-26
32 ft 5 in (9.90 m)
1 ft 7 in (.48 m)
4 ft 11 in (1.51 m)
-28
34 ft 4 in (10.46 m)
1 ft 8 in (.51 m)
5 ft 7 in (1.70 m)
-30
36 ft 2 in (11.02 m)
1 ft 10 in (.55 m)
6 ft 3 in (1.90 m)
Based on:
1. 105’ (32 m) minimum bend radius
2.
L
= beacon housing, EZ-Connect, and transition sub, and 1/3 of first
drill pipe (totalling 6’t 3” [1.9 m]) in the ground before steering
B. ENTRY PITCH, SETBACK, AND DEPTH
Entry pitch, setback, and depth work together with bend limits to
determine bore path. Entry pitch is drilling unit slope compared to
level ground. Setback is distance from entry to horizontal.
Minimum depth is measured at point bore becomes horizontal.
JT920 Power Pipe Drill Pipe
EA
SB
d
D
-18
24 ft 9 in (7.54 m)
1 ft 1 in (.34 m)
2 ft 9 in (.84 m)
-20
26 ft 9 in (8.14 m)
1 ft 3 in (.37 m)
3 ft 3 in (1.00 m)
-22
28 ft 8 in (8.74 m)
1 ft 4 in (.41 m)
3 ft 10 in (1.16 m)
-24
30 ft 7 in (9.32 m)
1 ft 6 in (.44 m)
4 ft 4 in (1.33 m)
-26
32 ft 5 in (9.90 m)
1 ft 7 in (.48 m)
4 ft 11 in (1.51 m)
-28
34 ft 4 in (10.46 m)
1 ft 8 in (.51 m)
5 ft 7 in (1.70 m)
-30
36 ft 2 in (11.02 m)
1 ft 10 in (.55 m)
6 ft 3 in (1.90 m)
Based on:
1. 105’ (32 m) minimum bend radius
2.
L
= beacon housing, EZ-Connect, and transition sub, and 1/3 of first
drill pipe (totalling 6’t 3” [1.9 m]) in the ground before steering
Summary of Contents for JT920
Page 54: ...54 JT920 JT920L SAFETY SAFETY ALERTS 54 JT920 JT920L SAFETY SAFETY ALERTS...
Page 68: ...68 JT920 JT920L PREPARATION 68 JT920 JT920L PREPARATION...
Page 75: ...JT920 JT920L TRANSPORTATION 75 TOW JT920 JT920L TRANSPORTATION 75 TOW...
Page 76: ...76 JT920 JT920L TRANSPORTATION TOW 76 JT920 JT920L TRANSPORTATION TOW...
Page 167: ......
Page 168: ......
Page 169: ...JT920 JT920L 169 JT920 JT920L 169...
