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     Expansion vessels sizing calculator B2  
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    Calculate the volume in liters of expansion vessels  
    system water content C = Litri   DATE  NUMBER ELABORATE  
    pipe   PROJECT  I.D.  
    refrigerating unit   CLIENT   
    boiler   ADDRESS   
    storage tank   DESIGNER  
    other                      
    Total liters circuit   xxx changeable values              
    open expansion vessels C = liter plant maximum temperature °C minimum temperature °C Maximum specific volume Specific minimum volume  E = difference V = expansion tank, liters +/- 10%   Vessel volume in liters   
   
   V = C x E open tank  
    Free input   V = C x E / [1- (Pi / Pf)] closed tank  
    Membrane Closed expansion vessels C = liter plant maximum temperature °C minimum temperature °C Maximum specific volume Specific minimum volume  E = difference Pa tank preload kg/cmq Pma safety valve kg/cmq Pi (Pa+1) kg/cmq Pf (Pma+1) kg/cmq V = expansion tank liters +/- 10%  
   
 
    Free input
 
    V Tank volume in liters  Vaso espansione.jpg    
    C Volume of water contained in the system in liters       
    E Difference between the specific volumes of water measured at the maximum and minimum temperature for the year       
    Pa Static pressure at the level of the tank increased or decreased by the difference between tank and safety valve. Normally we use the pre-charge of the tank.       
    Pma Set pressure of the safety valve       
    Pi Absolute pressure in kg / cm which is preloaded in the gas cushion, pressure that may be no less than the hydrostatic pressure at the point where the tank is connected (absolute pressure = gas pre-charge + 1)       
    Pf Absolute maximum operating pressure at which the safety valve is calibrated in kg / sq cm, reduced by an amount corresponding to the difference in height between the tank and safety valve if it is placed at the bottom or increased if more mail high (Press. plate + 1)