. kyHygienic Double Wall Plates Increase Production Safety FrontLine™ - Gemini Plate Heat Exchangers Gemini plate . Application Pasteurization and general cooling/heating of dairy, brewery, beverage and food products, when a mixproof design is required. Also applicable for cooling/heating in the pharmaceutical industry. Working principle A plate heat exchanger consists of a pack of corrugated metal plates with port holes for the passage of two fluids between which heat transfer will take place. The plate pack is assembled between a fixed frame plate and a movable pressure plate and compressed by tightening bolts. The plates are fitted with a gasket which seals the inter-plate channel and directs the fluids into alternate channels. The number of plates is determined by the flow rate, physical properties of the fluids and the temperature program. Connections may be located in frame plate and pressure plate and if multi section PHE, also in connection plate Frame The plates and the pressure plate are suspended from an upper carrying bar and located by a lower guiding bar, both of which are fixed to the support column. The tightening bolts are equipped with ball bearing washers in order to facilitate opening and closing of the unit. The frame and support column have adjustable feet. One unit may contain several heat exchangers, separated by connection plates with interchangeable connections. The Gemini plate The Gemini plates consist of two sheets formed together in order to minimize the inter-sheet air gap reducing the heat transfer. The gap between the two sheets is in direct contact with the atmosphere and is not in contact with any of the liquids. In order not to trap any liquid between the two sheets, contact to the atmosphere is safeguarded around the whole periphery of the plate. The Gemini double wall plates will increase the production safety, as a crack in a plate do not result in mixing of the two media.

The plate pack The chevron corrugation of the plates provides a passage between the plates and supports each plate against the adjacent one. It also enhances the turbulence, resulting in efficient heat transfer. Different chevron angles are available to reach the optimal high heat transfer at a given pressure drop. A unique distribution area provides an efficient flow over the plate surface. The Alfa Laval hanging system enables easy handling of the plates in the frame. Furthermore the corner guiding provides a strong plate pack. The plates are reversible and have parallel flow, which means that...

Inspection and external indication guarantee - Sheets have to be split open regularly in order to inspect for cracks not indicated externally. - Media will not be mixed if a crack appears in one of the sheets. - External indications of leakage have to be monitored by regular inspections. - Cracked plates must be replaced as soon as possible: - Product between sheets possible source for re-infection and corrosion. - Second sheet may also be cracked or corroded. - Humidity and dust may be sucked in between the sheets: - Risk of contamination. - Difficult to split sheets. Single plate sheet in port...

. ESE00255EN 1001 The information contained herein is correct at the time of issue, but may be subject to change without prior notice. How to contact Alfa Laval Contact details for all countries are continually updated on our website. Please visit www.alfalaval.com to access the information direct.