Reverse Circulation Drilling (RCD), also known as airlifting, is an effective drilling method that exploits compressed air, as it is injected into the drill pipe below water level,
to reduce the density of the internal water column and remove slurries through the circulation.
The mixture of water, air and cuttings is then flushed out through the drill pipe into settling tanks.
Using RCD Rigs is highly efficient, safe, and an environmentally friendly solution for drilling large diameters and deep depths. If you fall into one of the following conditions,
RCD is the best solution to deal with it.
▪ Large Diameter (longer than 800mm).
▪ Deep Depth (higher than 50m).
▪ Hard Rock Drilling (75MPa ~ 250MPa).
▪ Bore Piling in Marine Condition.
R.C.D(Reverse Circulation Drilling) System, also Known as air-lift is that compressed air is injected into the drill pipe below water level just above the drill bit.
This reduces the density of the interna water colimn and starts the circulation. The mixture of water, air and cuttings are then flushed out through the drill pipe into setting tanks.
Working with R.C.D system is highly efficient, safe and environmentally friendly solution for drilling large diameter an depth.
|Max.Drilling Diameter||1,500mm (4.92 ft)||1,500mm (4.92 ft)||2,000mm (6.56 ft)||2,500mm (8.20 ft)||3,000mm (9.84 ft)||3,300mm (10.83 ft)|
|Thrust||88ton (194,007lbf)||88ton (194,007lbf)||88ton (194,007lbf)||122ton (268,964lbf)||122ton (268,964lbf)||122ton (268,964lbf)|
|Pull-up Force||129ton (284,396lbf)||129ton (284,396lbf)||129ton (284,396lbf)||201ton (443,129lbf)||201ton (443,129lbf)||201ton (443,129lbf)|
-Including Clamping Device
|21.8ton (48,061 lb)||27.8ton (61,289 lb)||28.5ton (62,832 lb)||36.0ton (48,061 lb)||21.8ton (79,366 lb)||41.9ton (92.374 lb)|
|Power Pack||P2612C / P3618C / P4214D||P2612C / P3618C / P4214D||P2612C / P3618C / P4214D||P3618C / P5318C / P4218D||P3618C / P5318C / P4218D||P6028C|
Output & rpm
250bar (Max. 350bar)
|P2612C||TIER2, 3, 4F||194kW / 260HP / 2,200rpm||228ℓ/min x 2||1,912W x 4,800L x 2,476H||7.5 ton|
|P3618C||TIER3||268kW / 360HP / 2,100rpm||324ℓ/min x 2||1,912W x 4,800L x 2,476H||8ton|
|P3818C||TIER4F||285kW / 388HP / 1,900rpm||324ℓ/min x 2||1,912W x 4,800L x 2,476H||8ton|
|P4214D||TIER1||307kW / 418HP/ 1,800rpm||252ℓ/min x 2||1,900W x 4,800L x 2,340H||8.5ton|
|P4218D||TIER1||307kW / 41BHP/ 1,800rpm||324ℓ/min x 2||1,900W x 5,400L x 2,300H||8.5ton|
|P5318C||TIER3, 4F||399kW / 535HP / 2,100rpm||324ℓ/min x 2||1,912W x 5,400L x 2,562H||11ton|
|P5418V||TIER3||397kW / 540HP / 1,800rpm||324ℓ/min x 2||1,912W x 5,400L x 2,562H||11ton|
|P5518V||TIER4F||405kW / 551HP / 1,900rpm||324ℓ/min x 2||1,900W x 5,400L x 2,300H||11ton|
|P6028C||TIER3, 4F||447kW / 600HP / 2,100rpm||504ℓ/min x 2||1,912W x 5,400L x 2,562H||11.5ton|
|P6128V||TIER4F||450kW / 612HP / 1,800rpm||504ℓ/min x 2||1,912W x 5,400L x 2,562H||11.5ton|
* Option:Application of differnt engine brand(Volvo, Caterpillar) is availavle.
▪ Basic Drill String
To prevent buckling in the bottom part of the casing and for better verticality, the Basic Drill String is required.
The Basic Drill String is composed of a Drum Stabilizer, a Heavy Duty Space Pipe, a Heavy Duty Stabilizer and a Sub Drill Pipe (Reducing Pipe).
▪ Drill Rod Pipe Stabilizer
To prevent bending of the Drill String and keep verticality, we strongly suggest you use
1 Drill Rod Pipe Stabilizer for every 3 Drill Rod Pipes (1 Drill Rod Pipe = 3m).
▪ TOOTH CUTTER
Designed for drilling soft soil and soft rock layers (0 ~ 75MPa).
▪ TCI BUTTON CUTTER (** TCI: Tungsten Carbide Insertion)
Designed for drilling hard rock layers (80 ~ 250MPa).
▪TCI Button Disc Cutter
Designed for drilling hard rock layers (80 ~ 350MPa).
**Drill bits are designed for use in both soil and rock layers.
|Drill Bit Cutting Diameter||850mm||1,050mm||1,350mm||1,650mm||1,830mm||2,300mm||2,750mm|
|Drill Bit Length||1,500mm||2,000mm||2,000mm||2,000mm||2,500mm||2,500mm||2,500mm|
|Suction Pipe||NW200||NW200||NW200 / NW300||NW300||NW300||NW300||NW300|