ISO 80079-37:2016 爆発性雰囲気—パート37：爆発性雰囲気用の非電気機器—非電気タイプの保護構造上の安全性「c」、発火源の制御「b」、液浸「k」 | ページ 5

3.1

constructional safety “c”

ignition protection where constructional measures are applied so as to protect against the possibility of ignition from hot surfaces, sparks and adiabatic compression generated by moving parts

3.2

mechanically generated sparks

sparks produced by mechanical impact or friction burning particles, as well as showers of particles, produced by impact or friction between two solid materials

3.3

control of ignition source “b”

ignition protection where mechanical or electrical devices are used in conjunction with nonelectrical equipment to manually or automatically reduce the likelihood of a potential ignition source from becoming an effective ignition source

Note 1 to entry: This might for example be a level sensor used to indicate loss of oil, a temperature sensor to indicate a hot bearing or a speed sensor to indicate over-speed.

3.3.1

automatic control measure

action taken without manual intervention, to reduce the likelihood of a potential ignition source from becoming an effective ignition source

3.3.2

manual control measure

action taken by a person as a result of a warning, indication, or alarm, to reduce the likelihood of a potential ignition source from becoming an effective ignition source

3.3.3

ignition prevention devices/systems

arrangement that converts signals from one or more sensors into an action, or indication, to reduce the likelihood of a potential ignition source from becoming an effective ignition source

3.3.4

safety devices

devices intended for use inside or outside explosive atmospheres but required for or contributing to the safe functioning of equipment and protective systems with respect to the risks of explosion

3.4

liquid immersion “k”

type of protection where potential ignition sources are made ineffective or separated from the explosive atmosphere by either totally immersing them in a protective liquid, or by partially immersing and continuously coating their active surfaces with a protective liquid in such a way that an explosive atmosphere which may be above the liquid, or outside the equipment enclosure, cannot be ignited

3.4.1

protective liquid

a liquid which prevents the explosive atmosphere from making direct contact with potential ignition sources and thereby ensures the explosive atmosphere cannot be ignited

3.4.2

equipment with a sealed enclosure

totally enclosed equipment that limits the ingress of an external atmosphere during the expansion and contraction of the internally contained protective liquid during use in service

Note 1 to entry: Such equipment includes any pipework associated with it and often contains an overpressure relief device.equipment with a sealed enclosureequipment with a sealed enclosure

3.4.3

equipment with a vented enclosure

enclosed equipment that allows the ingress and egress of an external atmosphere through a breathing device or constricted opening during the expansion and contraction of the internally contained protective fluid during normal operation

Note 1 to entry: Such equipment includes any pipework associated with it.

3.4.4

open equipment

equipment that is immersed, or has its components immersed, in a protective liquid that is open to the external atmosphere

Note 1 to entry: For example, an open top vessel with immersed moving components. Such equipment includes any pipework associated with it.