BW NW HW PW SW Casing Tubes

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Geological Casing Tubes
W Series Casing
Flush-jointed casing: each casing tube has a male thread at one end and female thread at the other end. The heavy wall section provides internal and external mating shoulders for the threaded portion to butt-up against, providing twice the contact area of coupled casing and helping to prevent the threads climbing under heavy torque loads. This is by far the most popular type of casing used in geotechnical applications.
X Series Casing
Flush-coupled casing: each casing tube has a box thread at both ends and lengths are connected together by a pin-to-pin coupling. This allows couplings to be replaced when pin threads become worn or damaged. It also means that the casing tube can have a thinner wall than the coupling, allowing the overall weight of casing string to be minimized. This can be important when drilling to greater depths.Casing tubes are available in DCDMA sizes BW, NW, HW, PW and SW and Metric Sizes 46 -146 mm.

Size

Flush-Jointed W Series Casings

Size

Outer Diameter

Inner Diameter

 

inch

mm

inch

mm

BW

2.874

73.0

2.374

60.3

NW

3.500

88.9

3.000

76.2

HW

4.500

114.3

4.000

101.5

PW

5.500

139.7

5.000

127.0

SW

6.625

168.3

5.937

150.8

Flush-Coupled X Series Casings

NX

3.500

88.9

3.000

76.2

HX

4.500

114.3

4.11

104.4

PX

5.500

139.7

4.870

123.7

* Casing thread: 4 threads per inch.   * Casing length: generally supplied with length 3.0m, 1.5m & 0.75m.

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