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il volume di accumulo deve essere compreso fra un livello minimo, sempre presente in vasca, per garantire l’immersione e l’innesco delle pompe, e un livello massimo, pari alla quota di fondo tubo del condotto in entrata.
the accumulation volume shall vary from a minimum level – which is always granted in the tank to facilitate the pump immersion and start – to a maximum level – which is equal to the immediate lower water area underneath the entrance pipe.