Q & A > Question Details
In technically evaluating any crude prior to its processing at a hydroskimming refinery, what is the significance of following properties of the crude:
Its Reid vapor pressure (RVP)
Total acid number (TAN)
Mercaptans sulfur
Pour point
Calorific value (Gross)
Copper strip corrosion
Conradson carbon residue
Kinematic viscosity @ 40C
02/07/2010 A: RENE AGA, SECOT, renelaga@telefonica.net
High RVP means higher light ends contents and more possible losses during handling, but on the other hand means more valuable light hydrocarbons. Also important to know for pumping because vaporization at the suction.
Mercaptan sulfur indicates sourness. High amounts require more severe sweetening and/or desulfurization capacity or severity.
H2S is toxic. If in crude oil it will go with into the gas recovery and increases the need of treatment.
Pour point means the cold behaviour of the crude. High pourpoint means that pumping problems may occur at low temperatures.
Calorific value is a measure of the energy content. it is higher when the H/C ratio of the crude is higher. For instance paraffinic versus nephtenic crudes.
13/09/2009 A: Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
Assuming the question relates to existing units, the listed data would be used:
- TAN affects metallurgy required
- viscosity of the resid cut could affect the heat exchanger or cooler capacity
- RSH affects hydrotreater capacity
- Pour Point affects desalter capacity