This standard specifies terms and definitions, model and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of downhole drill hammers and bits.
This standard is applicable to downhole drill hammers (hereinafter referred to as hammers) and downhole drill bits (hereinafter referred to as bits) powered by compressed air or a mixed medium of compressed air and water. Hammers and bits, as downhole drill tools, are used for drilling blast holes and deep holes for various applications in all kinds of mine engineering and other construction projects.
2 Normative references
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 22512.2-2008 Petroleum and natural gas industries—Rotary drilling equipment—Part 2: Threading and gauging of rotary shouldered thread connections (ISO 10424-2:2007, MOD)
JB/T 3576 General specification for rust-preventing of rock drilling machines and pneumatic tools
JB/T 7302 Rock drilling machines and pneumatic tools—General specifications for packing of products
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
low pressure hammer
a hammer with working pressure below 0.8 MPa
