ii) If the forepeak is divided to hold two kinds of liquids, the collision bulkhead may be pierced below the bulkhead deck by two pipes, each of which is fitted as required by 4-6-2/9.7.3(a)i), provided there is no practical alternative to the fitting of such a second pipe and that, having regard to the additional subdivision provided in the forepeak, the safety of the vessel is maintained.