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5. Examples of mistakes to avoid when sizing valves
Non-exhaustive list:
request a valve setting of 110% of the PS of the container or pipe. The valve must operate at maximum PS. Its flow calculation is carried out at 110% PS, corresponding to the initial transient phase of pressure relief;
do not take into account the correct temperature data for hot gases, and the associated thermodynamic values;
do not check the air flow rate (valve supplier data) corresponding to the hot LPG flow rate;
forget the calculation of valves in a degraded operating situation (n – 1 valves) for maintenance or inspection;
forget to take back pressure into account (or assess it incorrectly) in the case of valves collected in a capacity.
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Examples of mistakes to avoid when sizing valves
Conclusion
Bibliography
Also in our database
Websites
Legislative texts (French administration website) http://www.legifrance.gouv.fr
INERIS. AIDA regulatory database http://www.ineris.fr/aida
SNCT (Syndicat national de la chaudronnerie et de la tuyauterie)
Standards and norms
- Dispositifs de sécurité pour protection contre les pressions excessives - NF EN ISO 4126-1 à 7 -
- Industries du pétrole, de la pétrochimie et du gaz naturel. Systèmes de dépressurisation et de protection contre les surpressions - NF EN ISO 23251 -
- Soupapes de sécurité pour réservoirs GPL - NF EN 14129 -
- Soupapes de sûreté des réservoirs de gaz de pétrole liquéfié (GPL). Équipement auxiliaire...
Regulations
Decree no. 99-1046 of December 23, 1999 on pressure equipment
Decree of December 21, 1999 on the classification and conformity assessment of pressure equipment
Order of March 15, 2000 on the operation of pressure equipment
BSEI circular no. 06-80 of March 6, 2006 on the conditions for application of the order of March 15, 2000
...
Technical documentation
INERIS BADORIS : Document de synthèse relatif à une barrière technique – Safety valve – 2007
Manual for the storage of propane and butane. Léon Hérenstein – Société du Journal des Usines à Gaz – 1976
Technical documentation from valve manufacturers
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