GOST 31440.1-2011 Reciprocating internal combustion engines. Safety requirements for design and construction of engines for use in potentially explosive atmospheres. Part 1. Group II engines for use in flammable gas and vapour atmospheres
2011GOST 31440.1-2011 Reciprocating internal combustion engines. Safety requirements for design and construction of engines for use in potentially explosive atmospheres. Part 1. Group II engines for use in flammable gas and vapour atmospheres