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Bulk carriers are the largest employment segment in shipping. The Chief Officer's standing challenge between voyages is preparing holds to a standard that will pass the NCB or nominated surveyor's pre-loading inspection. Failure means the Notice of Readiness is invalid + the ship is off-hire until re-inspection — on a Panamax at $25k/day, hours matter. This page covers the four standard grades, the procedure per grade, the worst cargo transitions, and the master + Chief Officer duties from cargo discharge to NOR-ready.
| Grade | Requirement | Typical use |
|---|---|---|
| Load-on-top (LOT) / Cargo-clean | No residue that will damage the next cargo | Same-cargo continuous voyage; coal-to-coal, iron-ore-to-iron-ore |
| Normal-clean | Swept + hosed + dry; visible cargo residue removed | Cross-cargo but not sensitive (coal-to-fertilizer, non-food) |
| Shovel-clean | Normal-clean + no visible bilge / paint damage / rust flakes | Sensitive but not food (fertilizer-to-wood, some concentrates) |
| Grain-clean | Swept + washed + fresh-water rinsed + fully dry + no rust + clean bilge suctions | Grain, sulphur, wood pellets, non-food concentrates for premium markets |
| Hospital-clean (or food-grade) | Grain-clean + solvent-degreased + chlorine-tested + odour-free | Human-consumption grain, rice, edible oils (rare) |
Bilge testing is the single most common failure point in grain-clean inspection. Standard test: fill the bilge with fresh water; sound it; drain via bilge suction; sound again. Any oil sheen, sludge, or residual water = fail. If bilge suction is blocked, the entire hold fails. Chief Officer should test every bilge before the surveyor arrives + arrange emergency dredging/rodding if needed. On a Panamax with 7 holds + 2 bilge wells per hold, this is 14 bilge tests per pre-load inspection cycle.
Load-on-top / Cargo-clean (lowest): no residue that will damage the next cargo. Normal-clean: swept clean of previous cargo, hosed down, dry. Shovel-clean: as normal + no visible bilge or paint damage. Grain-clean (highest): swept + washed + rinsed with fresh water + fully dry + no rust flakes + all bilge suctions clean + hatch coamings + bulkheads free of residue. Additional grades (e.g. hospital-clean for foods) impose stricter tests. NCB (US) + BIMCO panel surveyors set the market standard.
Typical Panamax (7 holds) grain-clean after a coal cargo: 3-5 days of continuous work with 8-crew hold-cleaning team. Includes: hold sweep (~4 hours per hold), high-pressure hose down (~6 hours per hold), fresh-water rinse + drain (~4 hours per hold), dry + touch-up of paint damage (~8 hours per hold), inspection (~2 hours per hold). Weather + steaming schedule + water availability all affect the actual time. Add 1-2 days after cement or petcoke.
If NCB or a nominated surveyor rejects any hold at pre-loading inspection, the Notice of Readiness (NOR) is invalid + the ship becomes off-hire (or laytime does not commence) until re-inspection passes. On a Panamax at $25k/day, 24 hours off-hire is a real cost. Chief Officer + Master should ALWAYS request a joint pre-load inspection with the surveyor + reach the pass BEFORE tendering NOR — do not let the receiver reject after NOR is tendered.
Coal to grain is a well-known bad transition (fine coal dust adhering to hold structures + rust). Cement to any wet or foodstuff is worse (cement residue sets on damp steel + is nearly impossible to remove without chipping). Petcoke to grain is one of the hardest — petcoke staining requires solvent-degreasing that most bulkers cannot do at sea. If a bad transition is unavoidable, plan a mid-voyage cleaning stop or accept an extended prep time at the load port.
Rust flakes from the deckhead (previous cargo dislodged them + they landed on the hold-top). Paint damage from stevedore grabs (steel visible + rust risk). Cargo residue in bilge wells + under floors. Standing water anywhere. Ventilator screens obstructed. Bulkhead ladders + rungs still with previous cargo residue. Chief Officer's pre-inspection walk should catch all of these before the surveyor arrives.
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