It is crucial that safety critical valves on offshore installations close on demand to reduce the consequences of external hydrocarbon leakages. To ensure this such valves are normally tested periodically. During valve tests an internal leakage can occur meaning that there is a flow of hydrocarbons through the valve in closed position. Today the industry commonly applies acceptance defined by American Petroleum Institute recommended practice. These are fixed criteria defining the maximum acceptable flow rate through a closed valve. An alternative methodology is presented in this paper. The basic idea ofthe methodology is that only leaks through a closed valve that do not have significant consequential effects on a release to the atmosphere in terms offire and/or explosion scenarios should be accepted. Based on evaluations of such potential consequences, internal leakage rate can be established by use ofthe proposed methodology. In this paper the methodology is applied to well valves. It is, however, general and can also be applied to other safety critical valves.
Consequence based methodology to determine acceptable leakage rate through closed safety critical valves
2008
7 Seiten, 2 Bilder, 1 Tabelle, 12 Quellen
Aufsatz (Konferenz)
Englisch
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