arpadveress 
Mitigations which reduce the potential for the formation of a flammable mixture:
Where possible, it may be preferable to locate hydrogen process equipment in the open air, with natural ventilation to dissipate any leaked hydrogen.
Alternatively, the hydrogen equipment may be located in an enclosure to permit detection of leaks and instigate forced ventilation to prevent accumulation.
The following mitigations may reduce the frequency or probability of a release:
— equipment designs which minimise the number of connections, are leak-free by design or use
inherently safe equipment design;
— control of operating pressure to prevent over-pressurisation;
— in-process leak detection such as the ability for isolated systems to hold pressure;
— regular inspections and maintenance.
The following mitigations may reduce the frequency of scenarios related to gas accumulation (delayed
ignition scenarios):
— ventilation (e.g. passive or active ventilation);
— hydrogen detectors to provide detection and automatic shutdown/isolation if flammable mixtures
present, particularly in enclosed spaces;
— permanent inert atmosphere (for instance, in small electrical equipment enclosures).
Where the source of release is situated outside an area or in an adjoining area, the penetration of a significant quantity of flammable gas or vapour into the area can be prevented by suitable means such as:
— physical barriers;
— maintaining a sufficient overpressure in the area relative to the adjacent hazardous areas, so
preventing the ingress of the flammable gas; purging the area with sufficient flow of fresh air, so ensuring that the air escapes from all openings where the flammable gas or vapour may enter.
Keep up good work!
Arpad
