ISO 8866:1991 pdf free download.Rotary core diamond drilling equipment System C.
ISO 8866 specifies the material for and the dimensions of rotary core diamond drilling equipment, system C.
NOTE 1 Cutting materials other than diamond may be used.
It applies to
— single- and double-tube core barrels. including diamond core bits, reaming shells, core lifters, core-lifter cases, core tubes (outer and inner) and heads;
— drill rods and couplIngs;
— casing tubes and couplings.
The casing tubes are not designed for drilling, and the casing string is only employed for casing-oil the hole.
The range of equipment covers diamond core drilling of holes from 35 mm to 112 mm in diameter (outer bit diameter) with the corresponding core dl. ameters from 21 mm to 92 mm.
Single- and double-tube core barrels provide a means of coring compact rocks (types M and DM core barrels), fissured and fractured rocks (types T and DT core barrels) and fractured and broken-down rocks (type DP core barrels).
2 DesIgnation
The designation of items complying with this International Standard comprises
— the name of the item;
— the letter(s) identifying the core barrel type (not applicable to drill rods and coupling, casing tubes and casing couplings):
— the nominal outside diameter of the item;
— the letter C (denoting system C).
EXAM PLES
Reaming shell DT59C
Drill rod 54C
3 MaterIal
The equipment shall be manufactured from materials which, in the manufactured Items, provide mechanica properties not less than those given In table 1.
4 DimensIons and tolerances
The main dimensions of system C equipment are given in toble2. Other dimensions and tolerances are given in figure 3 to figure 44. Tube ovality should be kept within outer diameter tolerances.
The maximum deviation from straightness should not exceed
1:2000 of the tube length, for drill rods and core tubes of outer diameter < 73 mm
1:1 200 of the tube length, for casing tubes and core tubes of outer diameter> 73 mm
The curvature over 250 mm of each drill rod and core tube ends should not exceed 0,5 mm. See figure 1.
All dimensions are given in millimetres.