Guideline H-07
All the reasonably foreseeable conditions shall be taken into account, which occur during operation (starting, operation, stop) and standby (storage, transport, maintenance, emptying, blanketing or inerting). Note 1:The operating instructions shall identify the reasonably foreseeable hazards arising from misuse which were not possible to eliminate during the design (see Annex I section 1.3). Note 2:The maximum […]
Guideline E-10
No, this is aiming at the slow decomposition of unstable fluids occurring without ignition source and resulting in a slow increase in pressure. Examples for gases which slowly decompose are Diborane (CAS No. 19287-45-7, UN No. 1911) and Germane (CAS No. 7782-65-2, UN No. 2192). Such gases also have specific requirements with regard to the […]
Guideline A-42
Yes. Reason:Even though discharge piping will be only momentarily pressurised, and such piping is open at the discharge end, it fulfils the definition of piping in Article 2 (3). Note 1:A silencer installed in the discharge piping is excluded according to Article 1 paragraph 2 (p). Note 2:The location where the pressure PS is specified […]
Guideline A-48
Yes, when the maximum allowable pressure PS they can be exposed to is above 0,5 bar, flame arresters and flash back arresters are covered by the PED and, in general, should be considered as pressure accessories. Such flame arresters are generally also covered by ATEX directive. In that case, they are excluded from PED if […]
Guideline A-56
No. Reason:The classification under the PED is based on PS in normal or foreseeable operating conditions. When the manufacturer classes an explosion as an incident, rather than as operation as intended, the explosion pressure shall not determine the classification according to the PED. When an explosion is considered included as part of the intended operation […]
Guideline B-21
An unstable gas in this context is a gas that is able to decompose either slowly or explosively. In case of the former, the decomposition reaction usually occurs homogeneously over the entire volume whereas in case of the latter, the decomposition reaction –after having been triggered locally by an ignition source– propagates as a self-sustaining […]