Dry bulk does not only move inside the plant — it has to be loaded onto supply vessels and received back from them, and that quayside transfer has its own rate, pressure and venting constraints that catch out operators who treat it like an internal conveying job. This page covers how barite and bentonite cross the quay in both directions.
Loading bulk to the vessel
Bulk is loaded by dense-phase pneumatic conveying from the plant's silos: material is metered into a sender or pressure pot, pressurised, and conveyed under pressure through the transfer hose into the vessel's bulk tanks. The vessel's tanks must vent the conveying air as fast as they fill, and the sender cycles — fill, pressurise, convey, vent — to move batch after batch across the quay.
Receiving bulk back
The same path runs in reverse to back-load bulk from the vessel into plant silos, recovering unused material or repositioning inventory. Receiving relies on the vessel's own blowers and pressure pots and on the plant being ready with free silo space, a clear conveying route and a working bin vent on the receiving silo to handle the displaced air.
Rate is set by pressure and venting
Transfer speed is governed by conveying pressure, line and hose size, and — most often the real limit — how fast the receiving tank can vent the conveying air. A vessel tank that cannot vent quickly enough throttles the whole transfer regardless of available pressure, which is why slow bulk loading is so frequently a venting problem misdiagnosed as a pressure one.
Segregation and dust control at both ends
Bulk transfer respects the same segregation as fluids — the right material to the right, clean, correct tank — and controls dust at both ends, since connecting and disconnecting bulk lines and venting receiving tanks are prime dust-release points. Drip and dust management at the connection keeps the quay clean and the product contained.
Ship-shore discipline
Because it is a two-party operation across a moving vessel, bulk transfer runs under the same ship-shore discipline as fluid loading: a completed checklist, agreed rates, continuous communication and a means of emergency shutdown in place before transfer starts, all within defined weather and sea-state limits.
Bulk crosses the quay under pressure
Loading and back-loading both run on dense-phase conveying between plant silos and vessel tanks, and the binding constraint is usually receiving-tank venting rather than available pressure. Run with proper segregation, dust control and ship-shore discipline, bulk transfer is fast and clean; ignore the venting limit and it crawls.
Key takeaways
Bulk transfer to and from vessels moves dry barite and bentonite by dense-phase pneumatic conveying between plant silos and vessel bulk tanks in both directions, through senders and pressure pots, governed by conveying pressure, line size and — usually the binding constraint — receiving-tank venting. It follows the same segregation, dust-control and ship-shore discipline as fluid loading. Slow bulk transfer is most often a venting limit, not a pressure one.