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Can anyone explain the different types of pumping arrangements on small to MR tankers?
I know Japanese MR tankers are called Pumproom designs and they typically have like 3 large pumps, while Korean MR tankers are called Deepwell designs and they typically have like 12 different deepwell pumps of smaller capacity.
I also know Korean deepwell designs can carry IMO cargoes while Japanese pumproom MR tankers only carry either DPP or CPP cargoes, but the obvious question that arises is why would anyone ever prefer the Japanese design if it can't ever carry IMO cargoes? Are the big pumps better for thicc dirty cargoes?
I have the same question for smaller product tankers. Some bunkering tankers are Japanese vessels with 2-3 large screw pumps, while others have framo pumps of no more than 200 CBM/hr capacity each. But they're all coiled, so they can heat up the cargo to make it less viscous and discharge it even through small framo pumps, no? Why do owners prefer the screw pump designs so much?
