5 replies to this topic

[process16]

hello

suppose that we have volumique flow of a crude oil at standard condtion =200m3/h

well to determinate the masse folw we multiply  volumique flow  by specifique gravity

for example if  our specifique gravity is 840 kg/m3 so its easy to get the flow mass

= 840*200

how i can determinate the mass flow of the crude oil in other conditions of temperature and pressur

for exmple 13 bar and 35°c

Edited by tarek12, 27 May 2015 - 01:23 AM.

[samayaraj]

Tarek12,

 

Simply determine the density of crude oil at required pressure and temperature and multiply with flow rate, you will get mass flow rate.

 

 

well to determinate the masse folw we multiply  volumique flow  by specifique gravity

for example if  our specifique gravity is 840 kg/m3 so its easy to get the flow mass

= 840*200

 

Its not specific gravity. Its density and has unit of kg/m^3. Specific gravity is the ratio density of liquid/ density of water and it has no unit.

[P.K.Rao]

Use ASTM D 1250 Table 5A and 6A

[process16]

samayaraj

well this is what i did

but what i didnt understund why in the case of gas we should determinate the flow rate of gas in the new conditions of pressure and temperature but  here we always multiply by the same flow rate

is it including in the meaning of comressible and incompressible fluid????

[samayaraj]

Tarek12,

 

For a constant mass flow rate of gas, volumetric flow rate will vary based on the pressure and temperature since its compressible in nature. Lesser the pressure & more is the temperature for gas, specific volume will be more and vise versa.

 

For liquids, compressibility is negligible against the pressure and volume will change according to the change in temperature. So for a given temperature and any pressure, volumetric flow rate will be nearly constant for liquids. Hence for liquids, we do not take pressure in to account.

[process16]

Tarek12,

 

For a constant mass flow rate of gas, volumetric flow rate will vary based on the pressure and temperature since its compressible in nature. Lesser the pressure & more is the temperature for gas, specific volume will be more and vise versa.

 

For liquids, compressibility is negligible against the pressure and volume will change according to the change in temperature. So for a given temperature and any pressure, volumetric flow rate will be nearly constant for liquids. Hence for liquids, we do not take pressure in to account.

 

Tarek12,

 

For a constant mass flow rate of gas, volumetric flow rate will vary based on the pressure and temperature since its compressible in nature. Lesser the pressure & more is the temperature for gas, specific volume will be more and vise versa.

 

For liquids, compressibility is negligible against the pressure and volume will change according to the change in temperature. So for a given temperature and any pressure, volumetric flow rate will be nearly constant for liquids. Hence for liquids, we do not take pressure in to account.

mmmmm well let me distrub you again hhhh

1/ whene we say that we talk just about temperatur in the case of liquide, if we  take a crude oil from 10bar to 100 bar we will not get the smae volume , so pressur has an effect???so why  we dont consider  pressur variation  in our estimation or calcul