(1) Where the amount calculated in accordance with section 421(a) is insufficient to pay the claims mentioned in that paragraph in full, the amount calculated in accordance with section 421(b) shall be available for payment of the unpaid balance of claims under section 421(a) and such unpaid balance shall rank rateably with claims mentioned under section 421(b).
(2) Without prejudice to the right of the claim referred to in section 421(a) for loss of life or personal injury, claims referred to in section 424 shall have priority over the claims referred to in section 421(b).
(3) The limits of liability for any salvor not operating from any ship or for any salvor operting solely on the ship to, or in respect of which the salvor is rendering salvage services, shall be calculated according to a tonnage of 1.500 tons.