NBN ISO 13577-3:2021

This part of ISO 13577 specifies safety requirements for generation and use of protective and reactive
atmosphere gases that are part of industrial thermo-processing equipment (TPE).
NOTE The general safety requirements common to TPE are provided in ISO 13577-1 (see Introduction).
This part of ISO 13577 deals with significant hazards, hazardous situations and events relevant to the
generation and use of protective and reactive atmosphere gases created by thermochemical reactions
and their use in TPE that are part of TPE as listed in Clause 4 and Clause 5, when used as intended and
under the conditions foreseen by the manufacturer.
This part of ISO 13577 covers
— pipework downstream of and including the manual isolating valve,
— equipment for the generation of atmosphere gases,
— additional equipment for the use of atmosphere gases in TPE,
— safety devices, and
— functional requirements for safety related control system
for the generation and use of protective and reactive atmosphere gases.
It applies to the supply of atmosphere gas, source gas, inert gas and process liquids to TPE and their
removal from TPE, confined to equipment integrated in the TPE.
This part of ISO 13577 also details the anticipated significant hazards associated with atmosphere gas
systems and their use in TPE and specifies the appropriate preventative measures for the reduction or
elimination of these hazards.
The pressure hazard of the piping and components covered by this standard is within the maximum
pressure/size relationship of group I as described in Annex C.
This part of ISO 13577
— specifies the requirements to be met to ensure the safety of persons and property during installation,
commissioning, start up, operation, shutdown and maintenance,
— does not cover the relevant risks involved in the flue gas ducting system when it is not considered a
part of TPE,
— is not applicable to utility supply upstream of the TPE main disconnects,
— does not apply to TPE for semi-conductor devices,
INTERNATIONAL STANDARD ISO 13577-3:2016(E)
© ISO 2016 – All rights reserved 1

ISO 13577-3:2016(E)
— does not apply to TPE with atmosphere, such as air and flue gas from an over stoichiometric
combustion,
— does not cover the decommissioning of the TPE,
— does not cover vacuum furnaces,
— does not deal with the hazard of noise which is covered in ISO 13577-1,
— is not applicable to generation and use of atmosphere gas in TPE and associated plant which is
manufactured before the date of its publication, and
— gives the necessary requirements for the information for use.
A TPE designed according to this part of ISO 13577 does not create any potentially explosive atmosphere
in the area around the TPE and is not designed to be located in an area with a potentially explosive or
hazardous atmosphere.
A table of typical protective and reactive gases is given in Annex B.