FLASH TANK CALCULATION  
Give Inputs in Yellow colour cells only  
S.NO Description Values UOM  
1 Flash Tank Inlet Juice Quantity (M ) T/hr  
2 Juice inlet temperature ( Ti ) oC  
3 Juice outlet temperature (To ) oC  
4 Specific Heat of the juice (Cp) Kcal/Kg  
4 Juice density (ρL) kg/M3  
5 Flash Vapour Density(ρV) kg/M3  
6 Juice inlet velocity m/sec  
7 Juice outlet velocity m/sec  
8 Flash vapour velocity in vent m/sec  
11 C = coefficient
Author:
Refer peter rein page no. 214
 m/sec  
9 Specific volume of vapour
Author:
Take Specific volume for Avg temp. of vapour and juice
 M3/kg  
10 Latent Heat of flash vapour ( λ )
home:
Taken for juice inlet temperature
 Kcal/Kg  
Result  
S.NO Description Values UOM  
1 Velocity of flash vapour in flash tank
Author:
Umax = C x [ (ρ L – ρV)/ ρV]0.5
 m/sec  
2 Flash vapour Quantity
Author:
[ M x Cp x (Ti-To)]/ λ
Its comes in T/hr than it is to be converted into M3/sec by using specific volume of vapour
 M3/sec  
3 Flash Tank Juice inlet Dia
Author:
By using general formula Q = AV ( V = juice inlet velocity and Q = Qty of juice inlet)
 mm  
  Say mm  
4 Flash tank Dia
Author:
By using general formula Q = AV ( V = Velocity of flash vapour in flash tank and Q = Qty of flash vapour)
 mm  
  Say mm  
5 Flash tank Vapour Vent Pipe Dia
Author:
By using general formula Q = AV ( V = flash vapour velocity in vent pipe and Q = Qty of flash vapour)
 mm  
  Say mm  
6 Flash tank juice outlet Dia
Author:
Q = AV ( Q= Qty of juice and V = Velocity of juice outlet) or can be calculate
D > 1.116 (Q)0.4
mm By D > 1.116 (Q)0.4
  mm By Q = AV
  Say mm