What is the meaning of IADC code for the tricone drill bits
IADC code is short for “International Association of Drilling Contractors”.
The IADC Code for Tricone Bits defines its bearing design and other design features ( SHIRT TAIL, LEG, SECTION, CUTTER).
IADC Codes make it easier for drillers to describe what kind of rock bit they are looking for to the supplier .
Far Eastern follows the IADC bit classification system in which the first three digits classify the bit according to the formation it is designed to drill and the bearing/seal design used.
IADC code explanation for First digit:
1,2,and 3 designate Steel Tooth Bits with 1 for soft, 2 for medium and 3 for hard formations.
4,5,6,7 and 8 designate TUNGSTEN CARBIDE INSERT BITS for varying formations hardness with 4 being the softest and 8 the hardest.
IADC code explanation for the Second digit:
1,2,3 and 4 are further breakdown of formation with 1 being the softest and 4 the hardest.
IADC code explanation for Third digit:
1 and 3: standard open bearing (non -sealed roller bearing) roller bit
2: Standard open bearing for air drilling only
4 and 5: roller sealed bearing bit
6 and 7: journal sealed bearing bit
Note:
*Difference between 1 and 3:
3 with carbide insert on heel of cone, while 1 without
*Difference between 4 and 5:
5 with carbide insert on heel of cone, while 4 without.
*Difference between 6 and 7:
7 with carbide insert on heel of cone, while 6 without.
IADC code explanation for Fouth digit:
The following letter codes are used in the fourth digit position to indicate additional features:
A. Air Application
R. Reinforced Welds
C. Center Jet
S. Standard Steel Tooth
D. Deviation Control
X. Chisel Insert
E. Extended Jet
Y. Conical Insert
G. Extra Gage Protection
Z．Other Insert Shape
J. Jet Defiection
Bearing Types:
There are primarily four (4) types of bearing designs used in trcione drilling bits:
1) Standard Open Bearing Roller Bit:
On these bits the cones will spin freely.This type of bit has a front row of ball bearings and a back row of roller bearings.
2）: Standard Open Bearing Roller Bit for Air Drilling
Cones are similar to #1 ,but have air injection directly to the cones to cool the bearings. Air flows into the cone through the passage ways inside the pin.(Not for mud applications)
3）Sealed Bearing Roller Bits
These bits have an O-Ring seal with a grease reservoir for bearing cooling.
The seals acts as a barrier against mud and cuttings to project the bearings.
4) Journal Bearing Roller Bits
These bits are strictly oil/grease cooled with nose bearings,O-ring seal and a race for maximum performance.
Far Eastern Tricone Bits have rubber sealed bearing and metal sealed bearing.
