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Core Tube/Casing


Geological Casing Tubes

Standard lengths are 3.0m, 1.5m, 1m, and 0.5m. Other lengths are available on request.
Casing tubes are available in DCDMA sizes BW, NW, HW, PW, SW & Chinese standard sizes  and metric sizes 46 -146 mm.

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.

Metric Casing Tubes
Metric Casing Tubes are available in diameter range 46mm – 146mm. They are manufactured from thin wall cold drawn steel tubes of a very high mechanical specification. The tubes are flush-jointed with a male thread at one end and a female thread at the other (thread pitch 4 t.p.i).

The casing tubes are designed to be used in conjunction with TT, T2 and T6 series metric core barrels. For example, a T2-86 core barrel will fit inside 101 metric casing, and a T6-101 core barrel will fit inside 116 metric casing, etc.

The clearance between the core barrel and the inside of the casing tube is quite small, reducing the volume of water that is required for flushing, and creating a high up-hole fluid velocity which facilitates efficient removal of rock cuttings from the borehole.

Size

DCDMA W Series Casings

Size

Outer Diameter

Inner Diameter

Inch

mm

Inch

mm

BW

2.874

73.03

2.374

60.3

NW

3.500

88.90

3.000

76.2

HW

4.500

114.30

4.000

101.6

PW

5.500

139.7

5.000

127.0

SW

6.626

168.30

6.123

155.7

Flush-Coupled X Series Casings

NX

3.5000

88.9

3.172

80.57

HX

4.5000

114.3

4.110

104.39

PX

5.459

138.66

4.933

125.30

Metric Series Casings

46

44.5

37.15

56

54.15

47.15

66

64.25

57.25

76

74.25

67.25

86

84.25

77.25

101

98.00

88.30

116

113.00

103.30

131

128.00

118.30

146

143.00

133.30

Chinese Standard Coupling Series Casings

73

73

64

89

89

80

108

108

99

127

127

116

146

146

136

168

168

155



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