Explosive atmospheres - Part 36: Non-electrical equipment for explosive atmospheres - Basic method and requirements

1 Scope

This part of ISO/IEC 80079 specifies the basic method and requirements for design,

construction, testing and marking of non-electrical Ex equipment, Ex Components, protective

systems, devices and assemblies of these products that have their own potential ignition

sources and are intended for use in explosive atmospheres.

Hand tools and manually operated equipment without energy storage are excluded from the

scope of this standard. This standard does not address the safety of static autonomous

process equipment when it is not part of equipment referred to in this standard.

NOTE 1 Static autonomous process equipment includes items such as tanks, vessels, fixed pipework and hand

operated valves which do not have their own source of energy that could create a potential ignition source during

operation.

This standard does not specify requirements for safety, other than those directly related to the

risk of ignition which may then lead to an explosion. The standard atmospheric conditions

(relating to the explosion characteristics of the atmosphere) under which it may be assumed

that equipment can be operated are:

• temperature -20 °C to +60 °C;

• pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and

• air with normal oxygen content, typically 21 % v/v.

Such atmospheres can also exist inside the equipment. In addition, the external atmosphere

can be drawn inside the equipment by natural breathing produced as a result of fluctuations in

the equipment’s internal operating pressure, and/or temperature