Tetra Therm®Lacta Dairy pasteurisation unit Application Tetra Therm Lacta is a dairy pasteurisation unit designed for continuous processing and pasteurisation of market milk, cheese milk, yoghurt milk, cream, ice-cream mix and other low acid liquid dairy products. Working principle Tetra Therm Lacta is as standard automated to safeguard production. Production is strictly controlled by production recipes with processing parameters. Main process sequences can be divided into the following main steps: • Pre-sterilisation • Filling • Production / circulation • Intermediate cleaning • Emptying • Cleaning-In-Place Before production can commence it is necessary to sterilise the unit by circulating hot water for 20 minutes. After pre-sterilisation, the unit is cooled down and stabilised to production temperatures. If there is a time gap between pre-sterilisation and production, the unit could be set in hibernation mode. This is an energy conservation mode in which the energy consumption is decreased up to 85% compared to the hot water circulation mode by reducing the power, steam and water consumption. When downstream equipment is ready, production can start. Production starts by filling the unit with product via the balance tank. The product displaces the water/product mix to drain, white water tank or reject tank. The balance tank includes level control and CIP device, which sefeguards the gentle treatment of the product and ensures a high degree of cleanability.

Before being homogenised in a Tetra Alex homogeniser (option), the product is regeneratively pre-heated in a Tetra Plex plate heat exchanger (PHE) by the outgoing pasteurised product. Other matching optional sub-units includes functions like deaeration, separation and fat-standardisation. To ensure even heating on the product, final heating takes place in the PHE by means of an indirect hot water circuit. The product is held in a continuously climbing holding tube for the required period of time. If the pasteurisation temperature gets too low, an automatic flow diversion valve, placed downstream...

Standard units with fixed capacities. Highercapacities available. Main unit with • Product balance tank (BTD) with level positioner, product bowl • Centrifugal product feed pump • Flow control (frequency controlled pump, or homogeniser as timing device) • Free-standing Tetra Plex plate heat exchanger (PHE) with cooling, regenerative, and heating sections, including protec- tion sheets • Holding tube, continuously climbing, mounted as a sub-unit at the backofthe main unit • Hot water unit, incl. brazed PHE, pump, steam valve andtrap, expansion vessel, shut-off valves, etc. • Control panel in stainless...

Technical Data Approx. consumption data for Tetra Therm Lacta 10, 5 000 - 35 000 l/h and per 1 000 l or market milk Steam, 3 bar: Ice water, 3 bar, 2°C (outlet 7°C): 13 kg/h, 50 kg/h (peak during sterilisation) 1 300 l/h during production No water consumption during pre-sterilisation 1 100 l/h 50 Nl/m, total not depending of capacity 7 - 15 kW, at 5 000 l/h and depending on options excl. homogeniser Rinsing water during CIP, 3 bar: Instrument air: Electricity: Approx. measurements including required service are in mm. Dimensional drawing shows additional sub-units such as Tetra Alex homogeniser,...