Assay Parameters

Enter crude oil assay data for quality assessment

Crude Name / ID (optional)

API Gravity (degrees)

Typical range: 10-50 degrees API

Sulfur Content (wt%)

Sweet: <0.5%, Sour: >0.5%

TAN (mg KOH/g)

Total Acid Number

Pour Point (F)

Lowest flow temperature

Viscosity @ 100F (cSt)

Salt Content (PTB)

Pounds per thousand barrels

Nitrogen (wt%)

Vanadium (ppm)

Crude Quality Assessment

Overall Classification

Quality Metrics

Weight Classification -

Sulfur Classification -

Corrosivity (TAN) -

Specific Gravity -

Density (kg/m3) -

Processing Considerations

Desalting Required -

HDS Severity -

Corrosion Concern -

Catalyst Poisoning Risk -

Estimated Yield Potential

Light Ends + Naphtha -

Middle Distillates -

Vacuum Gas Oil -

Residuum -

Enter assay data and click Analyze Crude

Crude Oil Classification Reference

API Gravity Classifications

Classification	API Gravity	Specific Gravity	Description
Extra Light	>45	<0.80	Condensate, very light
Light	35-45	0.80-0.85	High yield, easy processing
Medium	25-35	0.85-0.90	Balanced yield
Heavy	15-25	0.90-0.97	More residuum, needs upgrading
Extra Heavy	<15	>0.97	Bitumen, tar sands

Sulfur Classifications

Sweet Crude: S < 0.5 wt% (Premium pricing) Medium Sour: S = 0.5 - 1.0 wt% Sour Crude: S = 1.0 - 2.0 wt% High Sulfur: S > 2.0 wt% (Significant discount)

TAN (Total Acid Number) Guidelines

Low: TAN < 0.5 mg KOH/g - Minimal corrosion concern Moderate: TAN = 0.5-1.0 - Monitor corrosion High: TAN > 1.0 - Requires corrosion mitigation

Crude Oil Assay Interpreter