Fuel oil

[rocio74]

Hi all,

I need to know the vapor pressure for the fuel oil at 80ºC but I do not have the composition of this fuel.

The pressure and temperatutre design conditions for this fuel are:

Pd = 18 bar (a)
Td = 80ºC


Thanks in advance,
Rocio Rodriguez

 

[JLSeagull]

Which fuel oil?

ASTM D 975 describes seven grades of Diesel including Numbers 1-D S15, S500, S5000 and numbers 2-D S15, S500 and S5000. The S number reflects the ppm sulfur level. ASTM D 396 adds ASTM D 1655 describes aviation turbine fuel, D 6615 covers Jet B and D 6985 covers other marine distalates. ASTM D 396 adds number 4, 5 and 6 residual fuel descriptions. D 6751 covers bio diesel. Knowing which fuel oil is of interest wiykd be helpful for someone to advise the potential vapor pressure ranges.

 

[jmw]

With an 80degC temp it might be an intermediate fuel, e.g. IF30 (30cst at 50degC)
The main standard for marine fuels these days seems to be ISO 8217 2005E.
You might try web sites like Viswalab for data.

JMW

http://www.ViscoAnalyser.com

 

[rocio74]

The client doesn´t want to us the composition of the fuel. The project is a "biomasa plant". The fuel line will be with steam traced under a client requirement and in order to avoid the solidification of the fuel and keep the fluidity.

The operation conditions for this fuel are:

Pop = 7 bara
T op = 50ºC

 

[Drexl]

Do you know density/viscosity of the fuel? If you need trace heating, do you have heavy fuel oil? If so the vapor pressure must be low.
Do you need an good estimate or is it enough that you know the vp is below a certain value?

 

[BigInch]

see thread378-253326


**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[TD2K]

If the client doesn't want you to know the composition ask them to provide a vapor pressure. I don't know what the accuracy you want/need but anything is likely to have a pretty wide error band without more information than you have provided. The design pressure and temperature for example don't provide any clue to what the vapor pressure is.

 

[JLSeagull]

Lacking adequate process data, and if I am sure that something is unlikely to flash or cavitate; sometimes I use 1.0 psia for the vapor pressure in control valve sizing, etc. Such cases are reviewed if data improves.