The Drawworks is an integrant part of the drilling rig and represents the main element of the hoisting system. Depending on its place of installation (either on the working floor or at a lower level ), the drawworks works along with a cathead shaft, a sand drum, a gear box, a separate or integral rotary table drive unit or it does not include them. If equipped with one or two drums, the drawworks will be also provided with an auxiliary hydromatic or electromagnetic brake coupled to the drum shaft through a free running coupling; the said auxiliary brake belongs to the drawworks assembly as well the mechanical one does.
An inertia brake attached to one of the drawworks shaft provides protection to the clutch jaws as well as safe and fast shifting of the jaw clutches when the speed is shifted. The drawworks assembly is also equiped with an automatic bit feeding device ( either pneumatically or hydraulically operated ), a block travel limiter and a grooved wrapper permitting the line to be correctly wound. See the drawworks specifications as shown below.
| Specifications |
UM | TYPE | ||||||||||
| TF-68EU | TF55 | TF55E | TF44 | TF44E | TF38 | TF38E | TF25 | TF25E | TFI20 | TFI15 | ||
| MAX. INPUT POWER | HP | 3,500 | 3,000 | 3,000 | 3,000 | 3,000 | 2,000 | 2,300 | 1,350 | 1,600 | 700 | 400 |
| MAX. LINE PULL |
Metric t | 62 | 55 | 55 | 44 | 44 | 38 | 38 | 25 | 25 | 20 | 15 |
| ton | 68 | 61 | 61 | 49 | 49 | 42 | 42 | 28 | 28 | 22 | 17 | |
| HOISTING SPEEDS |
- | 4+4R | 4+2R | 4+4R | 4+2R | 4+4R | 4+2R | 4+2R | 2+2R | 4+4R | 2+1R | 2+1R |
| LINE SIZE | mm | 42 | 38 | 38 | 35 | 35 | 35 | 35 | 32 | 32 | 28 | 25 |
| AUXILIARY BRAKE TYPE | - | FE1900 | FE1900 | FE1900 | FH60 | FE1700 | FH60 | FE1400 | FH46 | FE1400 | FH560 | FH560 |
|
MAX. |
m/s | 20 | 22 | 20 | 22 | 19.6 | 22 | 23 | 20 | 20 | 20 | 20 |
| WEIGHT | kg | 50,200 | 46,600 | 46,600 | 35,900 | 37,790 | 33,282 | 32,591 | 24,000 | 28,287 | 8,000 | 7,500 |
Related pages
