 |
...........The
design of the E.S.Bit enables the Guide Bit to perform most of the
...........drilling directly while the
expanded Bit Heads perform the reaming.
...........This minimizes loss of hammer
energy and maintains a high drilling efficiency.
........... Since E.S.Bit Heads expand
and retract concentrically, they will drill
............and maintain a round hole.
...........The E.S.Bit system has no
tendency to wander, or to produce an offset.
...........This feature assures a straight,
round hole, equivalent to that drilled with
...........a conventiomal bit.
...........Afer drilling to the required
depth, the E.S.Bit Heads are retracted by
...........rotating in the reverse direction
when the Bit body is lifted.
..........
//
//
//
| Type |
Wing |
Bit
Gauge |
Applicable
Casing pipe |
Guide
Bit |
Hammer
Tupe |
Extended
D1(mm) |
Retracted
(mm) |
Max.
O.D.
D2(mm) |
Min.
I.D.
D3(mm) |
Normal
Size
(In.) |
O.D.
D4(mm) |
315 |
4 |
373 |
318 |
355.6 |
336.6 |
14" |
320 |
SD12,
DHD112, N120, K270 |
365 |
4 |
425 |
363 |
406.4 |
387.4 |
16" |
365 |
SD12,
DHD112, N120, K320 |
410 |
4 |
478 |
412 |
457.2 |
435.0 |
18" |
414 |
SD15,
K350 |
460 |
4 |
530 |
461 |
508.0 |
482.6 |
20" |
463 |
SD15, K370,
SD18, N180 |
510 |
4 |
580 |
509 |
558.8 |
533.4 |
22" |
511 |
SD18, N180 |
560 |
4 |
630 |
559 |
609.6 |
584.2 |
24" |
561 |
SD18, N180,
K470 |
600 |
4 |
685 |
600 |
660.4 |
631.8 |
26" |
603 |
K520, N240 |
|
|
