DRAWORKS

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.
HOISTING
SPEED
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

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