Reverse Circulation RC Hammer 3 Inch 4 Inch 4 1/2 Inch With
Outstanding Reliability
Reverse Circulation Hammer Description
The on-board compressor delivers power to a pneumatic reciprocating
piston. The piston, in turn, drives a tungsten-steel drill bit
which is purpose designed to be able to crush hard rock.
Similar to air core drilling, drill cuttings are returned to
surface inside rods. We achieve this through the use of dual wall
drill rods: an outer drill rod with an inner tube. When compressed
air is blown through the rod, the volume displaces the air, lifting
the samples to the surface.
Once cuttings reach a diverter at the top of the hole, they’re
moved through a hose and around the cyclone, which slows the sample
down. From the cyclone the sample goes over a splitter that
delivers a percentage of the entire sample into a sample bag. The
exploration drilling team then collect the samples aligned to the
hole depth and lay them out for the client to log, and then
transport to the lab for assay.
Reverse Circulation Hammer Parameters
| ROSCHEN RC Hammers Specifications |
| Hammer Size | Hammer | Bit Shank | ROSCHEN Code | Hole Range (mm) | External Diameter (mm) | Length (without bit) mm | Weight (N.W.) kgs | Connection Thread | Working Pressure |
| 3" | RE531 | RE531 | ROS RC 30 | 84-100 | 81 | 1069 | 29 | 3“ Remet | 1.0-3.0Mpa |
| 3" | RE035 | RE035 | ROS RC 35 | 84-105 | 85 | 1075 | 35 | 3“ Remet | 1.0-3.0Mpa |
| 4 1/2" | RE004 | RE004 | ROS RC 40 | 111-127 | 107 | 1252 | 52 | 3.5"-4" Remet 4" Metzke | 1.0-3.0Mpa |
| 4 1/2" | RE540 | RE540 | ROS RC 45 | 111-127 | 107 | 1252 | 52 | 3.5"-4" Remet 4" Metzke | 1.0-3.0Mpa |
| 5" | RE040 | RE040 | ROS RC 50 | 113-130 | 109.5 | 1191 | 57 | 3.5"-4" Remet 4" Metzke | 1.0-3.0Mpa |
| 5" | RE542 | RE542 | ROS RC 50 | 113-130 | 109.5 | 1191 | 57 | 3.5"-4" Remet 4" Metzke | 1.0-3.0Mpa |
| 5" | RE543 | RE543 | ROS RC 50 | 120-135 | 116 | 1191 | 62 | 3.5"-4" Remet 4" Metzke | 1.0-3.0Mpa |
| 5" | RE545 | RE545 | ROS RC 50 | 122-135 | 117.5 | 1261 | 65 | 4"-4.5" Remet 4"-4.5" Metzke | 1.5-3.5Mpa |
| 5 1/2" | RE547 | RE547 | ROS RC 55 | 130-146 | 124.5 | 1270 | 71 | 4.5" Remet 4.5" Metzke | 1.5-3.5Mpa |
| 5 1/2" | RE052 | RE052 | ROS RC 55 | 130-146 | 124.5 | 1270 | 71 | 4.5" Remet 4.5" Metzke | 1.5-3.5Mpa |
| 5 3/4" | RE054 | RE054 | ROS RC 55 | 130-146 | 124.5 | 1270 | 85 | 4.5" Remet 4.5" Metzke | 1.5-3.5Mpa |
| 5 3/4" | RE140 | RE140 | ROS RC 55 | 130-146 | 124.5 | 1270 | 85 | 4.5" Remet 4.5" Metzke | 1.5-3.5Mpa |
| 5" | PR40 | PR40 | ROS RC 50 | 124-142 | 120.5 | 1362 | 80.5 | 3.5"-4.5" Remet 3.5"-4.5" Metzke | 1.5-3.5Mpa |
| 5 1/2" | PR52 | PR52 | ROS RC 55 | 126-142 | 121 | 1227 | 68.5 | 4"-4.5" Remet 4"-4.5" Metzke | 1.5-3.5Mpa |
| 5 1/2" | PR52R | PR52/PR52R | ROS RC 55 | 130-146 | 124 | 1225 | 65 | 4"-4.5"Remet 4"-4.5" Metzke | 1.5-3.5Mpa |
| 5 1/2" | PR54 | PR54 | ROS RC 55 | 135-150 | 130 | 1294 | 84.5 | 4.5" Remet 4.5" Metzke | 1.5-3.5Mpa |
| 6" | MX5456 | MX5456 | ROS RC 60 | 136-150 | 132 | 1362 | 90 | 4.5" Remet 4.5" Metzke | 1.5-3.5Mpa |
| 6"~6 1/2" | RC62/RC62R | RC62/RC62R | ROS RC 65 | 152-190 | 146 | 1320 | 110 | As Request | 1.5-3.5Mpa |
| 8" | RC82/RC82R | RC82/RC82R | ROS RC 80 | 190-250 | 180 | 1395 | 185 | As Request | 1.5-3.5Mpa |
| 10" | RC100/RC100R | RC100/RC100R | ROS RC 100 | 250-370 | 240 | 1528 | 328 | As Request | 1.5-3.5Mpa |
| Notes: |
| Metzke, Remet thread is available! |
| Any special type shank of RC Hammer will be available by requests. |
Reverse Circulation Hammer Details
When using the conventional cross-over system, cuttings first
travel up around the bit before entering the centre tube through
cross-over slots. This method is rapid, cost-effective and
particularly suited for first pass exploration drilling.
In a number of geological scenarios, the large volume of sample
collected by RC systems can be a significant advantage. Exploration
projects dealing with a “nugget effect” (for example, coarse gold
or diamond projects) can often benefit from a larger diameter drill
hole. Roschen generally drills holes with a diameter ranging from 3
⅝” to 4 ½” (92 mm to 114 mm). The sample recovery from a 3 ⅝” (92
mm) diameter hole is approximately 11 lbs/ft (16.4 kg/m) depending
on rock type.
Reverse circulation RC is a drilling method widely used around the
world. The method is unbeatable in areas where water is scarce or
expensive, such as Australia and Western Africa (and, for the same
reason, in northern Canada).
HIGH RATE OF PENETRATION
A big advantage of RC is its high rate of penetration. Penetration
rates often exceed 80 m per shift depending on ground conditions.
The speed of drilling can often mean big cost savings compared to
slower drilling methods.
GOOD IN BAD GROUND
Reverse circulation RC drilling is relatively insensitive to ground
conditions, which may be difficult or slow to penetrate using other
methods. Dual-pipe RC was originally developed as a method to drill
“nightmare” geological formations (such as permafrost, glacial
till, broken rock, etc.) where conventional drilling methods were
costly and ineffective.
Reverse circulation RC drill cuttings are transported to surface
inside the centre tube of the dual pipe. Because of this sample
recovery is usually very good with high recoveries of both fines
and clays.
ENVIRONMENTALLY SOUND
Reverse circulation drilling has several environmental advantages.
First and foremost, RC mostly requires no water for rock drilling.
This is a benefit in areas with limited or sensitive water supply.
In addition, frozen water sources and waterlines can make winter
drilling both tricky and expensive, if not impossible. In certain
areas, like the arctic tundra, environmental permitting is easier
for winter drilling when the ground is frozen and unlikely to be
disturbed. Light-weight RC makes winter drilling in the arctic a
viable option.
