CSA M424.1:22

1 Scope 1.1 Inclusions This Standard describes construction and test requirements for new non-rail-bound diesel-powered, self-propelled machines for use in gassy underground coal mines. It is supplementary to or amendatory of CSA M424.0 and CSA M424.2. Note: The working environment of gassy mines is characterized by the presence of methane gas and combustible dust. 1.2 Exclusions This Standard does not specify requirements for safety, other than those directly related to the risk of ignition which can lead to an explosion. Braking system performance requirements and proof tests are not included in the scope of this Standard, except from the standpoint of the reduction of fire and explosion hazards. Notes: 1) See CSA M424.0 for general vehicle design, safety, and performance requirements. 2) See CSA M424.2 for diesel engine design, safety, and emissions requirements. 3) See CSA M424.3 for brake construction, stopping performance, and test requirements. 1.3 Standard atmospheric conditions The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that the engine may be operated are: a) temperature: –20 °C to 60 °C; b) pressure: 80 kPa (0.8 bar) to 110 kPa (1.1 bar); and c) air with normal oxygen content, approximately 21% v/v. 1.4 Terminology In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.