Rotary Drills

Reverse circulation (RC) drill pipe is a dual wall pipe used for uncontaminated, representative and continuous samples. It is also used to reduce air requirements and maintain uphole velocity in larger diameter drilling applications. RC Inlet air passes between the inner tube and outer barrel. Cuttings are evacuated through the center tube.

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Mining Tooling: Reverse Circulation Drill Pipe
Reverse circulation (RC) drill pipe is a dual wall pipe used for uncontaminated, representative and continuous samples. It is also used to reduce air requirements and maintain uphole velocity in larger diameter drilling applications. RC Inlet air passes between the inner tube and outer barrel. Cuttings are evacuated through the center tube.

Foremost manufactures a complete range of reverse circulation drill pipe and accessories including air swivels, saver subs, bit subs, interchanges, wear sleeves, blow-down and blow-back subs and open center bits.

Foremost's patented inner barrel suspension and retention system eliminates problems arising from the transfer of vibration and torque loads applied to the outer pipe. The inner pipe is suspended within the outer barrel and is relatively unstressed. The o-ring retainers absorb percussion forces and allow for replacement of the inner barrel in the field if required.

To suit customer requirements, Foremost offers various drill pipe configurations, with or without connector tubes:

Concealed Inner Pipe (CIP) - Incorporates a dual tube design, using both an outer barrel and a concealed inner tube. Connector tubes are not required when using CIP drill pipe. The inner tubes are sealed when the outer barrels are threaded together.

Connector Tube Pipe (CTP) - A dual tube design, incorporating an outer barrel and a concealed inner tube. Connector tubes are required when using CTP and are manually connected.

Protruding Inner Pipe (PIP) - A dual tube design using both an outer barrel and an inner tube, which protrudes from the pin tool joint. Connector tubes are not required when using PIP drill pipe. The inner tubes are sealed when the outer barrels are threaded together.

RC Hammer Pipe - The inner tube protrudes from the box tool joint and connector tubes are not required. The inner tubes are sealed when the outer barrels are threaded together.

Foremost uses advanced production equipment with controlled temperature welding and stress relief of tool joints. Material specifications and welding technique allow for the maximum possible wall thickness and strength of pipe in the tool joint area. Foremost drill pipe passes through extensive quality control inspections prior to customer delivery.

Custom lengths are available upon request.

Quick Refernce Guide

Series

Diameter

Length

Weight

CIP

4 in
(102 mm)

10 ft
(3 m)

146 lbs
(66 kg)

4-1/2 in
(144 mm)

20 ft
(6 m)

421 lbs
(191 kg)

9-5/8 in
(245 mm)

20 ft
(6 m)

1,347 lbs
(611 kg)

10-3/4 in
(273 mm)

20 ft
(6 m)

1,760 lbs
(798 kg)

CTP

4-1/2 in
(114 mm)

20 ft
(6 m)

417 lbs
(189 kg)

5-1/2 in
(140 mm)

20 ft
(6 m)

548 lbs
(249 kg)

7 in
(178 mm)

20 ft
(6 m)

804 lbs
(365 kg)

PIP

3-3/4 in
(95 mm)

10 ft
(3 m)

124 lbs
(56 kg)

5-1/2 in
(140 mm)

20 ft
(6 m)

540 lbs
(245 kg)

Hammer Pipe

6-5/8 in
(168 mm)

10 ft
(3 m)

480 lbs
(218 kg)

9 in
(229 mm)

10 ft
(3 m)

580 lbs
(263 kg)

10-3/4 in
(273 mm)

10 ft
(3 m)

870 lbs
(395 kg)

Foremost Sales Office
Tel: 1-403-295-5800 (Worldwide)
Toll Free: 1-800-661-9190 (Canada/U.S.A.)
Fax: 1-403-295-5810

   
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