Flash volume calculations regarding TPV

[limeister]

Thank you for your previous help.

Part 1

Is this equation correct?

Flash Ratio =
HL(into tank) - HL(of tank)
___________________________

HV(of tank) - HL(of tank)

HL = Enthalpy of sat.liquid
HV = Enthalpy of sat.vapor

into tank = flow of Oxygen liquid into tank
of tank = conditions of liquid oxygen already in tank.

Finding this ratio would give me the flash per hour if I times by the flow rate?


Part 2

We have a pump @ 85 KW and 21500 Sm3/hr flow rate.
I can find the enthalpy of the liquid before pump.
To find enthalpy of liquid after pump do I just do the following?

Convert power into Kal/hr = 73100 Kcal/hr
and then divide by enthalpy of liquid before pump (45 Kcal/Sm3) to get about 3.4 Kcal/Sm3
and finally add this number (3.4) to the "enthalpy of liquid before pump". to get enthalpy of liquid after pump? (48.5 Kcal/Sm3).

After this I can plug in the numbers using the ratio above to calculate % flash?

I was wondering I have missed anything

Have I confused everyone?

Your response would be appreciated