The Colcrete Eurodrill Reverse Circulation (RC) Drilling System has been designed to operate with DTH RC hammers and RC rock bit assemblies as detailed below.
Required where rotating power swivel contacts to the stationary return hose.
Lower side inlet swivel
Located below power swivel, allows air circulation to drill rod whilst allowing return cuttings to pass through swivel to upper swivel and return hose.
Reduces wear on side inlet swivel threading, inner cross-over also provided with sub.
Double tube drill rod provided with inner tube and friction
welded and nitrided tool joints. Screwing rods together
automatically seals the inner tube without the need to provide further connection parts.
Reverse circulation DTH hammer
It is necessary to have a cross-over sub connecting RC drill rods to backhead connection on hammer. All RC DTH hammers can be accommodated to this system.
|Outside Diameter Outer Rod (mm)||Inside Diameter Inner Rod (mm)||Thread Type|