Which type of pump is used in the oily waste transfer system?

Which type of pump is used in the oily waste transfer system?

• A. Sliding Shoe
• B. Piston Pump
• C. Gear Pump
• D. Diaphragm Pump

Answer: (A)

The key idea here is choosing a pump that can handle viscous, dirty liquids with small solids while delivering a smooth, reliable transfer without excessive shear. A sliding shoe pump does this well. It’s a positive-displacement pump that uses rotating shoes sliding against a cam ring to form sealed chambers. As the rotor turns, each chamber traps a fixed amount of oily waste and moves it from suction to discharge. This produces a steady, low-shear flow, which helps maintain the oil-water separation and prevents the liquid from emulsifying under aggressive mixing. It also handles varying viscosities and small particulates typical of bilge sludge and oily waste, and it tends to be robust and easy to service in a marine environment. Other pump types don’t fit as well. Piston pumps deliver high pressure but can create more shear and are less forgiving of dirty, sludgy mixtures. Gear pumps can handle viscous fluids but are more prone to wear or clogging from solids and can impart more shear. Diaphragm pumps handle dirty fluids, but they’re often slower for high-volume transfer and can be stressed by abrasive solids over time. For an oily waste transfer system, the sliding shoe (vane-type positive-displacement) pump offers the best balance of gentle handling, suction performance, and durability.

The key idea here is choosing a pump that can handle viscous, dirty liquids with small solids while delivering a smooth, reliable transfer without excessive shear. A sliding shoe pump does this well. It’s a positive-displacement pump that uses rotating shoes sliding against a cam ring to form sealed chambers. As the rotor turns, each chamber traps a fixed amount of oily waste and moves it from suction to discharge. This produces a steady, low-shear flow, which helps maintain the oil-water separation and prevents the liquid from emulsifying under aggressive mixing. It also handles varying viscosities and small particulates typical of bilge sludge and oily waste, and it tends to be robust and easy to service in a marine environment.

Other pump types don’t fit as well. Piston pumps deliver high pressure but can create more shear and are less forgiving of dirty, sludgy mixtures. Gear pumps can handle viscous fluids but are more prone to wear or clogging from solids and can impart more shear. Diaphragm pumps handle dirty fluids, but they’re often slower for high-volume transfer and can be stressed by abrasive solids over time. For an oily waste transfer system, the sliding shoe (vane-type positive-displacement) pump offers the best balance of gentle handling, suction performance, and durability.