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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).

Standard lengths are 3.0m, 1.5m, and 0.75m. Other lengths are available on request.

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.


Advantages:

  • Lighter and stronger than DCDMA casing tubes (W and X series)
  • Designed specifically for use with metric core barrels
  • Close fit between core barrel and casing tube results in efficient flushing 

 

Technical Data

Specification

Nominal Diameter (mm)

46

56

66

76

86

101

116

131

146

O.D. of Casing Tube (mm)

44.0

54.0

64.0

74.0

84.0

98.0

113.0

128.0

143.0

I.D. of Casing Tube (mm)

37.0

47.0

57.0

67.0

77.0

89.0

104.0

119.0

134.0

O.D. of Casing Shoe (mm)

46.0

56.0

66.0

76.0

86.0

101.0

116.0

131.0

143.0

I.D. of Casing Shoe (mm)

37.0

47.0

57.0

67.0

77.0

88.0

103.0

118.0

133.0

 

Mechanical Specification:

Cold Drawn Steel Tube Grade N80 or above.
Minimum Yield Strength 550 MPa,  Minimum Tensile Strength 690 MPa, Elongation 18% min.

 

Technical Standards:

Manufactured in accordance with International Standard ISO 3552-1: 1992 Rotary core diamond drilling equipment. System B. Metric units

 

Accessories:

Casing Drive Heads and Casing Clamps are available for each diameter.

Casing Shoes are supplied with Tungsten Cardbide (T.C.) crowns or Diamond Impregnated crowns.
Please refer to our Casing Shoes page for further details.