This standard was last reviewed and confirmed in 2013. Therefore this version remains current.
Specifies the material for and dimensions of equipment for drilling in solid or weakly fissured medium hard or hard formations to depths of 1200 m to 1500 m. Applies to equipment with outer bit diameters of 46 mm, 59 mm, 76 mm and 93 mm with corresponding core diameters from 24 mm to 59 mm.
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|std 1 145|
|std 2 145||Paper|
A standard is reviewed every 5 years
Stage: 90.20 (Under review)
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