Requirements for dual valves in foreign projects
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I am currently working on a project abroad, involving a 30% sodium cyanide solution with a pH value greater than 10. Domestic standards require that isolation valves be equipped with two valves. I wonder, do international standards also have such a requirement?
International standards also have similar requirements regarding the installation of isolation valves, especially when dealing with hazardous chemicals or solutions with a high pH value. Typically, to enhance safety and reliability, a dual-valve configuration (one operating valve and one backup valve) is recommended to ensure that the system can still operate safely in the event of a failure of one valve. For specific requirements, refer to relevant international standards such as the US API standards and the European EN standards. It is recommended to consult in detail the specific regulatory requirements applicable to the area where the project is located. .
Check according to the relevant standards referenced in the project’s specifications for equipment, instruments, etc. Domestic projects are also carried out in accordance with the standards referenced in the specification documents. Generally speaking, the origin of the dual-valve concept is not objective.
There is certainly no dispute regarding the dual-valve requirement; may I ask which standard, API or EN, is mentioned in the international standards?