Commercial identity controls pump classification, with concessional tax available only when pump and motor are sold inseparably.

Monoblock pumping sets were treated as "centrifugal pumps" because the motor and pump formed an inseparable commercial unit on a common shaft, so the concessional tax rate under the notification applied. Coupled pumping sets were covered only when the pump and motor were sold together as one inseparable commercial commodity; if sold separately as distinct items, the composite character was lost and the notification did not apply. Classification therefore depended on the goods' commercial identity and the actual mode of sale.

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Issues: (i) Whether monoblock pumping sets sold by the assessee fell within the expression "centrifugal pumps" and were taxable at the concessional rate of 3 per cent under the notification dated March 31, 1979; (ii) whether coupled pumping sets sold along with the motor were covered by the expression "centrifugal pumps" for the same notification, and whether such classification depended on whether the pump and motor were sold as an inseparable unit or as distinct items.

Issue (i): Whether monoblock pumping sets sold by the assessee fell within the expression "centrifugal pumps" and were taxable at the concessional rate of 3 per cent under the notification dated March 31, 1979.

Analysis: The notification granted reduced tax to centrifugal pumps. Monoblock pumping sets were treated as a single commercial commodity in which the motor and pump were attached on a common shaft and were inseparable. On that basis, and consistent with the commercial description of the goods, monoblock sets answered the description of centrifugal pumps.

Conclusion: The monoblock pumping sets were covered by the notification and were liable to tax at 3 per cent. The finding was in favour of the assessee.

Issue (ii): Whether coupled pumping sets sold along with the motor were covered by the expression "centrifugal pumps" for the same notification, and whether such classification depended on whether the pump and motor were sold as an inseparable unit or as distinct items.

Analysis: Coupled sets were treated as centrifugal pumps only where the pump and motor were sold together as one commercial unit and retained an inseparable identity. Where the motor was sold separately as a distinct item, the combined set would not retain the same character. The question was thus dependent on the factual manner of sale and was treated as a mixed question of fact and law.

Conclusion: Coupled pumping sets sold along with the motor as an inseparable unit were covered by the notification, but they were not covered if the pump and motor were sold separately as distinct items. The finding was partly in favour of the assessee and partly in favour of the Revenue depending on the factual mode of sale.

Final Conclusion: The reference was answered by holding that monoblock pumping sets qualified for the concessional rate, and coupled pumping sets qualified only when sold as an inseparable unit with the motor; otherwise they were outside the notification.

Ratio Decidendi: Goods are to be classified for sales tax purposes according to their commercial identity and actual mode of sale, and a composite pumping set remains a centrifugal pump only when the pump and motor are sold as one inseparable commercial unit.

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