ROYAL DUTCH <RD> UNIT RAISES HEAVY FUEL PRICES Scallop Petroleum Corp, a subsidiary of Royal Dutch/Shell group, said today it raised contract prices for heavy fuel 25 cts to 1.75 dlrs a barrel, effective today. The increase brings the price for 0.3 pct sulphur to 22.50 dlrs, up 1.75, 0.5 pct sulphur to 21.50 dlrs, up 1.50, 0.7 pct sulphur to 20.25 dlrs, up 75 cts, one pct sulphur to 19.50 dlrs, up 25 cts, two pct sulphur to 18.75 dlrs, up 75 cts, 2.2 pct sulphur to 18.50 dlrs, up 75 cts, 2.8 pct sulphur to 18.00 dlrs, up 75 cts.