311.2mm Steel Tooth Tricone Bit , FSG126 , TCI Tricone Bit , Sealed
Journal Bearing
SIZE AVAILABLE
From 5 7/8inch to 18 1/2inch
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
| Types & IADC Code | 116 117 | 126 127 | 136 137 | 216 217 | 246 247 | 326 327 |
| WOB | KN/mm(Bit Dia.) | 0.48~1.0 | 0.48~1.0 | 0.48~1.0 | 0.4~1.0 | 0.4~1.0 | 0.55~0.85 |
| Lb/in. (Bit Dia.) | 2742~5714 | 2742~5714 | 2742~5714 | 2285~5714 | 2285~5714 | 3140~4860 |
| Rotation Speed (Rpm) | 160~80 | 150~70 | 130~60 | 100~60 | 80~50 | 60~45 |
The above chart represents commonly available sizes and types, we
do produce other sizes and types of rock bits which do not appear
on this list. Please contact us for more information.
Roller Cone Bit Bearing Seals
Roller-cone bearing seals operate in an exceptionally harsh
environment. Drilling mud and most cuttings are extremely abrasive.
Drilling fluids often contain chemicals, and operating temperatures
can be sufficiently high to break down the elastomers from which
seals are made. Pressure pulses often occur in downhole drilling
fluids that apply lateral loading on seals that must be resisted.
On a purely practical level, bearing seals have two functions: to
prevent foreign materials, such as mud, cuttings, chemicals, and
water, from entering the bearings and to prevent bearing lubricant
from escaping the bit.
Visualize the difference in the nature of these two duties. On the
interior side, the seal is excluding clean, functional lubricant
from escaping the bit, while on the exterior side, the seal is
excluding dirt and chemicals from penetrating the bit. The
separation of these two extremely different functions takes place
at a small point between the two sides of a seal. If either of
these functions breaks down, the bearings and the bit could be
destined for failure.
