Technical classification of petroleum residue as Residual Fuel Oil allowed exemption despite separate notification entry.

Heavy Petroleum Stock was treated as Residual Fuel Oil because the tariff term was undefined and had to be given its technical meaning. Technical sources described Residual Fuel Oil as refinery residue or topped crude petroleum, which brought Heavy Petroleum Stock within that description. Its separate mention in the notification did not exclude it from the residual fuel category, and the later nil-rate entry for use as fertilizer feed stock did not change that position. The exemption was therefore available and the differential demand was set aside.

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Issues: Whether Heavy Petroleum Stock was classifiable as Residual Fuel Oil and, if so, whether it was entitled to the concessional exemption available to Residual Fuel Oil under the relevant notifications.

Analysis: Heavy Petroleum Stock was found to be a product obtained after refining crude petroleum and therefore a leftover residue of petroleum oils. The expressions used in the tariff and the notifications did not define Residual Fuel Oil, so the term was construed in its technical sense. Technical dictionaries and reference works described Residual Fuel Oil as topped crude petroleum or viscous residuums obtained in refinery operations, which supported the view that Heavy Petroleum Stock fell within that description. The Board's clarification was also read as treating Residual Fuel Oil broadly enough to include such residuums, and the later notification did not alter that position merely because Heavy Petroleum Stock was separately named with a nil rate when intended for use as fertilizer feed stock. The separate mention of Heavy Petroleum Stock did not mean it was outside the ambit of Residual Fuel Oil.

Conclusion: Heavy Petroleum Stock was held to be Residual Fuel Oil and therefore eligible for the benefit of the exemption. The demand based on differential treatment was set aside.

Ratio Decidendi: Where a tariff term is undefined, classification of a petroleum residue must follow its technical meaning, and a separately named product that remains within that technical description cannot be excluded from the exemption merely because it is also specifically mentioned in the notification.

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