Hi
Maby this can help you:
EN 1992-3:2009
Part 3 of Eurocode 2 covers the design of structures constructed from plain or lightly reinforced concrete, reinforced concrete or prestressed concrete for the containment of liquids or granular solids and other liquid retaining structures.
Or
EN 14944-3:2008
This European Standard specifies a method to determine the migration of substances from factory made cementitious products into test waters after contact with the products.
This European Standard is applicable to factory made cementitious products, e.g. cement mortar linings to metallic pipes, tanks, concrete pipes etc., intended to be used for the transport and storage of water intended for human consumption, including raw water used for the production of drinking water.