Hydrotesting with fuel oil

[IanMiller]

Alright i have another hydrotesting question. We will need to perform a hydrotest with product as our media, does anyone know the relationship of the density of fuel oil to elevated pressure, and the relationship between the density and temperature?

Thanks
Ian

 

[TD2K]

Variation with temperature is available through the API data books or the GPSA data books (I'd just use the standard HC tables at your fuel oil specific gravity). The compressibility is a little harder to get, let me think about this one.

 

[1969grad]

If you testing to the B31 codes you had better check to see if testing with a flammable liquid is permitted.

 

[25362]

One source quotes compressibilities for lube oils in the range of 1-1000 bar at 40 centigrades, to fall between 4.5-5.0 x 10^-5/bar.

Using the CRC Handbook compressibility and thermal expansion values for C14/C15 alkanes, indicates that the developed pressures on heating would be around 10 atm/^oC.

 

[hacksaw]

Leak testing is one thing, ASME pressure testing is another.

Use water for the hydro. It tends to be a messy operation when leaks develop and you don't shut down the exercise because of a fire hazard.

 

[aybee]

maybe I am missing something but if the temperature during the test does not change ..and its not likely to unless the vessel is in the sun and filled overnight and can heat up with the sun enough to heat the oil which would not be easy, then the effect of temperature change on the oil can be ignored. The density for determination of the static head can be estimated from the SG of the oil at whatever temp is gets put into the vessel.
Dont see that compressibility is a drama.. oil is used more on hydraulic systems under pressure than water. using oil (fuel oil, diesel etc) on systems which cannot be contaminated with oil is common practice..AYBEE

 

[chicopee]

What type of vessel are you hydrotesting? Is it a high pressure vessel? fuel storage tank? process piping?