Magnetic flow meters can be used to measure the flow rate. Magnetic Flow Meter and Centrifugal Pump Arrangements
#Pasteurization unit calculator free
Free circulation from outlet to inlet is required and the speed of the homogenizer must be greater than the rate of flow of the timing pump. It is a positive pressure pump if not, then it cannot supplement flow. The homogenizer may be used as timing pump. It must be used in conjunction with pressure differential controlling device and shall operate only when timing pump is operating, proper pressures are achieved in regenerator, and system is in forward flow. It is centrifugal "stuffing" pump which supplies raw milk to the raw regenerator for the balance tank. It ensures that nothing downstream is creating suction on the pasteurized side. It must be located greater than 12 inches above the highest point of raw product in system. This FDD can be cleaned in place and is more suited for automation.Īt the pasteurized product discharge is a vacuum breaker which breaks to atmospheric pressure.
#Pasteurization unit calculator series
Single Stem - An older valve system that has the disadvantage that it can't be cleaned in place.ĭual Stem - Consists of 2 valves in series for additional fail safe systems. It is important to note that the FDD operates on the measured temperature, not time, at the end of the holding period. At temperatures less than 72° C, the valve recloses to the normal position and diverts the milk back to the balance tank. It is essentially a 3-way valve, which, at temperatures greater than 72° C, opens to forward flow. The operator is responsible for recording the date, shift, equipment, ID, product and amount, indicating thermometer temperature, cleansing cycles, cut in and cut out temperatures, any connects for unusual circumstances, and his/her signature.Īlso called the flow diversion valve (FDV), it is located at the downstream end of the upward sloping holding tube. There are both pneumatic and electronic types of controllers. It monitors, controls and records the position of the flow diversion device (FDD) and supplies power to the FDD during forward flow. The STLR records the temperature of the milk and the time of day. The probe should sit as close as possible to STLR probe and be located not greater than 18 inches upstream of the flow diversion device. It is the official temperature to which the safety thermal limit recorder (STLR) is adjusted. The indicating thermometer is considered the most accurate temperature measurement. in direction of flow to eliminate air entrapment so nothing flows faster at air pocket restrictions. A centrifugal pump with magnetic flow meter and controller may also be used. It also must be interwired so it only operates when FDD is fully forward or fully diverted, and must be "fail-safe". It must be a positive displacement pump equipped with variable speed drive that can be legally sealed at the maximum rate to give minimum holding time in holding tubes. It governs the rate of flow through the holding tube. The timing pump draws product through the raw regenerator and pushes milk under pressure through pasteurized regenerator. increaseįor example: Cold milk entering system at 4° C, after regeneration at 65° C, and final temperature of 72° C would have an 89.7% regeneration: Its efficiency may be calculated as follows: Heating and cooling energy can be saved by using a regenerator which utilizes the heat content of the pasteurized milk to warm the incoming cold milk. The balance tank provides a means for recirculation of diverted or pasteurized milk. The balance tank also prevents air from entering the pasteurizer by placing the top of the outlet pipe lower than the lowest point in the tank and creating downward slopes of at least 2%.
It, therefore, helps to maintain a higher pressure on the pasteurized side of the heat exchanger. The overflow level must always be below the level of lowest milk passage in regenerator. It is equipped with a float valve assembly which controls the liquid level nearly constant ensuring uniform head pressure on the product leaving the tank.
0 kommentar(er)
