Meaning
Crude oil pricing schedules use density adjustments to settle value differences between delivered crude grades and benchmark specifications. An api gravity differential establishes the per-barrel price increase or deduction applied when a delivered cargo deviates from the baseline API gravity stated in a supply contract. Refineries utilize lighter crude streams to yield higher volumes of high-value transport fuels without heavy secondary processing.
Consequently, contracts establish scaled price penalties for heavier deliveries and premiums for lighter hydrocarbons up to defined technical thresholds.
Yield Adjustment
Refining yield profiles shift directly when incoming density strays from the contractual baseline. Trading agreements account for this physical reality by attaching specific financial adjustments to every degree of deviation on the API scale. A buyer receiving heavier crude incurs higher processing costs to crack the residue into marketable middle distillates, justifying a contractual discount.
Conversely, lighter deliveries reduce secondary processing overhead, though extremely light condensates trigger penalty caps if existing refinery distillation towers cannot capture the excess naphtha fractions efficiently.
Contractual Deduction
Settlement accounting incorporates density deviations through scheduled price adjustments verified against terminal laboratory assays. Sellers agree to debit balances or reduced invoice totals when bill of lading samples show higher density than the agreed standard. These valuation shifts alter the effective landed cost for distribution channels, shifting margin allocations between crude producers and off-takers.
Where contract terms specify strict quality bands, exceeding the maximum allowed gravity variance allows the buyer to reject the shipment entirely or force an immediate price renegotiation.
Refinery Boundary
Technical processing limits define the physical ceiling where density adjustments cease to reflect linear economic value. Pricing tables flatten or invert at high gravity bands, preventing suppliers from claiming premiums on ultra-light streams that generate processing bottlenecks. Commercial agreements specify these operational boundaries to align raw material valuation with actual yield economics at the receiver’s processing unit.
