They are equipped with a collection tank with a capacity of 50% of the total content of the tank, a service ladder starting from 5,000 liters, and a protective roof *.
The tanks and collection tanks are made of S235JR quality carbon steel, according to UNI EN 10025-2, and treated externally with two coats of primer and subsequent finishing with two coats of metallic gray synthetic enamel. They are equipped with a drain or cleaning sleeve with 1 ″ galvanized cap, upper recirculation sleeve, connection for earth cable connection, manhole 400mm diameter, complete with bolts and gasket with 3 ″ filling port with quick lockable bayonet cap and 90% load limiting valve, vent with brass flame-stop terminal, mechanical level indicator with float, removal pipe with non-return valve with calibrated spring, closing ball valve (useful for maintenance operations) and galvanized TEE fitting.
* the protective roof is optional and is made of galvanized tubular with galvanized corrugated sheet metal cover. Consisting of four poles designed for insertion into the supports of the collection tanks, upper frame, and cover plate.