At a plant running two daily visits, the second operator arrives to a situation defined by what the first operator found and documented — or didn't. If the morning visit logged "copertura parziale" surnatanti in the primary clarifier and set the ricircolo fanghi taratura down two notches, the afternoon operator needs to know that before touching anything. Without a structured handoff record, they're reading the basin visually and making assumptions.
What Gets Lost Between Shifts
The Porchiano template's dual-visit structure isn't administrative formality. Ora ingresso and Ora uscita for both visits, with Operatore 1 and Operatore 2 per slot, create an unambiguous accountability record. When the carroponte raschiatore shows vibration anomaly at the afternoon visit, the log tells you whether the morning check was rated clean by the same operator or a different one, and whether the weather shifted between visits — the Condizioni meteo field catches the common scenario where a gelo entry explains why equipment that ran fine at 8 AM is stiff and noisy at 15:00.
The redox potential, dissolved oxygen, and sludge concentration readings don't mean much in isolation. In sequence across forty daily entries, they describe the plant's biological behaviour under varying organic load and seasonal temperature. The Imhoff cone volume measurement is the daily sludge production indicator — elevated readings sustained over a week mean the wasting rate needs adjustment before the sludge age drifts out of spec.
The Mechanical Checks That Prevent the Expensive Events
Verifica funzionalità, rumorosità e vibrazione runs through mixers, pumps, and the clarifier bridge drive. These are 1-to-5 ratings, which makes them fast to enter and trend-readable across entries. A mixer that scores 4 for six weeks and then drops to 2 on two consecutive visits is a bearing on its way out. The rating history is the maintenance trigger, not the catastrophic failure event.
Bypass verification — attivo, non attivato dalla precedente visita, attivato dalla precedente visita — documents one of the more legally sensitive process events at a permitted facility. A bypass activation that isn't logged is a discharge event with no paper trail. The field exists because the regulatory consequence of undocumented bypass activation is significantly worse than a documented one with a corrective note.
Big-bag fill level at the screen — vuoto through pieno — governs the replacement decision. A bag at 3/4 full on a Friday afternoon means ordering a replacement before the weekend, not arriving Monday to a bag that ran over into the channel.