The cleanliness standard a bulk carrier’s hold must meet depends on the next cargo, not on the chief officer’s judgment. Grain requires a different standard from fertiliser, and fertiliser requires a different standard from steel coils. The charter party determines who pays for cleaning; the cargo inspector determines whether it passes.
This article covers the established cleanliness grades, how they are inspected, which cargo transitions are the hardest to clean, and what the chief officer prepares before the inspector boards.
What is hold cleaning, and what standard applies?
Hold cleaning is the removal of all cargo residues, dust, scale, rust, moisture, odour, and biological contamination from a bulk carrier’s cargo hold between voyages. There is no single regulatory standard — the applicable cleanliness grade is set by the next cargo’s requirements, the charter party, and the shipper’s or receiver’s trade association rules.
SOLAS Chapter VI Part A Regulation 5 requires that cargo spaces be suitable for the safe carriage of the intended cargo. For grain specifically, SOLAS Chapter VI Part C and the International Grain Code impose additional requirements on hold structural condition and cleanliness before loading. These regulatory requirements set a floor — the charter party and trade association rules typically sit above them.
The chief officer is operationally responsible for the cargo hold condition. The master signs the mate’s receipt and the bill of lading on the basis of hold cleanliness. A clean bill of lading issued for a hold that failed inspection, or that the chief officer knew was not clean, creates a direct liability for the carrier that the P&I club may not cover.
What are the hold cleanliness grades on bulk carriers?
The three working grades used across the dry bulk trades are grain clean, hospital clean, and shovel clean. These are not formally defined in IMO instruments — they are trade practice standards recognised by inspectors, charterers, and cargo insurers. The applicable grade is typically specified in the voyage charter party fixture note.
What is grain clean?
Grain clean is the standard required for loading grain, oilseeds, and food-grade commodities. It requires the hold to be free of all visible cargo residue, dust, loose rust, and any contamination from the previous cargo. The bilge suction must be tested, the bilge wells must be clean, and the hold must be dry. No odour from the previous cargo should be detectable.
Grain clean does not mean the hold is rust-free. Surface rust that is tight and not scaling is acceptable. Loose scale, flaking paint that would fall onto the cargo, and pitting corrosion with loose rust product are not acceptable — they represent a contamination risk to food-grade cargo.
For US grain exports, the National Cargo Bureau (NCB) conducts hold suitability surveys under USDA requirements. The NCB inspector’s certificate is required before loading at most US Gulf and Pacific Coast grain terminals. NCB standards broadly align with grain cleaning but include specific requirements on bilge suction system testing and the condition of hold fittings.
What is hospital clean?
Hospital clean is the highest practical standard required for pharmaceutical ingredients, certain food additives, malt, and some speciality grain cargoes. It requires the hold to be not just free of residue and contamination but odour-free, demonstrably free of pest infestation, and with no biological growth anywhere in the hold structure, including in the bilge wells and around frame bases.
Chemical washing with food-grade detergents, steam cleaning of bilge wells, and fumigation of the empty hold are typically required to achieve hospital clean. The inspection is conducted with laboratory-grade swab testing in some trades — visual inspection alone does not satisfy the standard. Hospital clean holds command a freight premium because the preparation cost is significant.
What is shovel clean?
Shovel clean — also called grab clean — requires only that all bulk cargo is removed to the extent achievable by mechanical grab or bulldozer. Minor residue on the tank top plating and frames is acceptable. This standard applies for loading non-sensitive bulk commodities: steel products, aggregates, heavy minerals, and some industrial cargoes.
Shovel clean does not protect against contamination of sensitive subsequent cargoes. A hold discharged to shovel clean standard after iron ore cannot load grain on the next voyage without a full clean to grain standard. The sequence matters — a shovel clean acceptance for one voyage does not define the standard for the next.
Who is responsible for hold cleaning under the charter party?
Hold cleaning responsibility depends on the charter party terms. Under a standard voyage charter on the Gencon form, the ship is delivered with holds suitable for the intended cargo — meaning the owner bears cleaning costs to achieve the required standard. Under a time charter, the charterer delivers the holds back to the owner in the same condition as received, making the charterer responsible for cleaning between voyages.
The freight terms FIOS (Free In and Out, Stowed), FIO (Free In and Out), and FI (Free In) define who pays for cargo handling — not hold cleaning specifically. Hold cleaning costs are usually addressed separately in the charter party as either owner’s or charterer’s expense. Disputes arise most frequently on consecutive voyage charters where the charterer nominates successive incompatible cargoes.
A charterer who nominates coal followed by grain on a consecutive voyage charter without allowing adequate time for cleaning to grain standard creates a delay claim against the vessel if loading is rejected by the cargo inspector. The allocation of costs for hold cleaning and re-cleaning is a recurring subject in ship chartering disputes, and the charter party language on hold condition at delivery and redelivery is the primary reference document.
What is the correct hold cleaning sequence after discharge?
The cleaning sequence runs from coarse to fine: cargo residue removal, mechanical sweeping, high-pressure fresh water washing, chemical treatment where required, ventilation and drying, and final inspection. Skipping or rushing any stage means the next stage cannot compensate. Chemical treatment applied over unswept residue produces a slurry that dries into a hard deposit.
Step-by-step hold cleaning procedure
- Stage 1 — Mechanical removal: bulldoze, sweep, or vacuum all remaining bulk cargo from tank top, frames, and bilge wells. Remove all loose debris through the hatch opening before washing begins.
- Stage 2 — Pre-soak: apply fresh water to the hold surfaces to loosen dried residue and dust. Allow 15–30 minutes before washing. Do not use seawater — salt contamination of a grain hold is a rejection ground.
- Stage 3 — High-pressure washing: wash all surfaces — tank top, frames, longitudinals, transverse bulkheads, hatch coaming internals, and ladder rungs — at 150–200 bar. Work top to bottom to prevent re-contamination of cleaned surfaces.
- Stage 4 — Chemical treatment (if required): apply appropriate cleaning agent for the previous cargo type. For coal and petcoke: alkaline detergent. For oils and grease: caustic solution. For sulphur: rinse with sodium carbonate solution to neutralise acidity. Allow contact time per manufacturer’s instructions.
- Stage 5 — Final fresh water rinse: remove all chemical residue. Verify drainage from bilge wells — blocked bilge suctions cause pooling that will fail any inspection.
- Stage 6 — Bilge well cleaning: manually clean bilge wells and suction strainers. Remove all debris, silt, and residue. Test bilge suction operation — this is a mandatory inspection item.
- Stage 7 — Ventilation and drying: open all ventilators and hatches. In humid conditions, run mechanical ventilation. The hold must be visually dry — no pooling, no condensation on surfaces — before inspection.
- Stage 8 — Final visual check by chief officer before the inspector boards.
Ventilation after washing is not optional. Moisture retained in the hold after cleaning contributes to sweat conditions during the voyage. For hygroscopic cargoes such as grain, fertiliser, and sugar, a hold that is technically clean but retains absorbed moisture in the tank top plating creates a micro-climate that promotes caking and moisture damage. Cargo hold ventilation management during the voyage must begin with a dry hold at loading.
Which cargo transitions require the most intensive cleaning?
The most demanding cargo transitions are those where the previous cargo is toxic, reactive, odorous, or leaves fine contaminating dust. The transition from any of these cargoes to grain or food-grade commodities requires the most intensive cleaning regime and carries the highest rejection risk at inspection.
Coal and petcoke to grain
Coal dust penetrates into pitting corrosion, weld seams, and any surface irregularity in the hold. It is virtually impossible to remove completely from a corroded hold by pressure washing alone. Chemical treatment with alkaline detergent is required, followed by light abrasive cleaning of any areas where coal dust is embedded in rust pockets.
Petcoke is harder to remove than coal — its waxy, low-moisture composition causes it to bond to steel surfaces under pressure. Steam cleaning or chemical dissolution is required for petcoke residue in hold corners and bilge wells. A hold that carried petcoke on the previous voyage should be allocated at least 48 hours for cleaning to grain standard.
Sulphur to any subsequent cargo
Sulphur residue reacts with moisture to form sulphuric acid, which attacks the hold structure and contaminates any subsequent cargo with sulphur compounds. After discharging sulphur, the hold requires neutralisation with a sodium carbonate (soda ash) solution before water washing. The bilge water from a sulphur hold is acidic — many ports require it to be retained on board rather than pumped overboard.
The sulphur smell persists in the hold structure even after visual cleaning is complete. A grain inspector who detects sulphur odour will reject the hold regardless of visual cleanliness. Adequate ventilation time — 24 to 48 hours in good weather — is required between chemical cleaning and inspection.
Fertiliser (ammonium nitrate, urea) to grain
Fertiliser cargoes leave fine, highly soluble residues in the hold. Urea and ammonium nitrate dissolve readily with fresh water washing, but their hygroscopic residues absorb moisture from the air and can cause caking and clumping in the next grain cargo if even trace quantities remain. Hygroscopic cargo behaviour in the presence of fertiliser contamination is well documented in cargo damage claims — even sub-visible contamination levels cause measurable quality deterioration.
What do GAFTA and FOSFA inspect when approving holds for loading?
GAFTA (Grain and Feed Trade Association) and FOSFA (Federation of Oils, Seeds and Fats Associations) are the primary trade association bodies whose survey standards govern hold suitability for grain and edible oils respectively. Their inspectors assess holds independently of the shipper, the receiver, and the vessel’s P&I club. A GAFTA or FOSFA rejection is a serious commercial event with significant cost and delay consequences.
The GAFTA inspection standard for hold suitability assesses visible cleanliness, odour, bilge condition, structural integrity, and the absence of contamination from previous cargoes. The inspector examines the hold by physical entry — not from the hatch rim. All areas accessible by ladder, including under the frames and in the bilge well corners, are inspected.
FOSFA maintains a list of acceptable previous cargoes for vessels loading vegetable oils and fats. The FOSFA acceptable previous cargoes list specifies which cargo transitions are permissible and which require additional cleaning measures or are prohibited entirely. A charterer who nominates an edible oil cargo on a vessel whose previous cargo does not appear on the FOSFA approved list must resolve the issue before the vessel arrives at the load port.
What does the bilge suction test involve?
The bilge suction test confirms that the bilge suction system in each hold is operational — suction pipes are clear, the strainer is clean, and the bilge pump draws down the bilge well to dry. NCB inspectors in the United States require a witnessed bilge suction test before issuing a suitability certificate. GAFTA inspectors check bilge well condition visually and by physical inspection of the strainer.
A bilge suction failure at inspection — blocked pipe, inoperative pump, or debris-filled bilge well — results in immediate hold rejection regardless of the visual cleanliness of the rest of the hold. The bilge suction test must be completed and confirmed before the inspector boards. The chief officer should witness the test and confirm the result in the cargo log.
What does the chief officer prepare before the hold inspector boards?
The chief officer’s role before a hold inspection is to confirm the hold meets the required standard independently — before the external inspector makes the same assessment and finds it does not. A rejection that the chief officer could have anticipated by a thorough pre-inspection check is a management failure, not an unforeseen event.
Pre-inspection checklist for the chief officer
- Enter every hold physically — inspect tank top, frames, bilge wells, ladder rungs, and hatch coaming internals from inside
- Check for residual dust in structural pockets — use a torch; coal dust and sulphur residue in weld seams is invisible from the hatch opening
- Smell test — detect any residual odour from the previous cargo; if detectable by the chief officer, it will be detectable by the inspector
- Bilge suction test — operate the bilge pump for each hold and confirm the well draws dry; note result and time in the cargo log
- Hatch cover drain channel check — confirm drains are clear and plugs are in place; pooled water in the coaming area contaminates cargo at loading
- Loose rust check — rap all surfaces with a gloved hand; loose scale that would fall onto cargo must be removed before inspection
- Bilge well cover condition — confirm covers are intact and properly seated; a missing or damaged cover is a hold rejection item
- Hold fittings — bilge suction strainers, sounding pipes, and ventilator covers must be present, intact, and clean
Hatch cover condition is assessed as part of the cargo hold inspection. A defective hatch cover that would admit water during the voyage affects cargo integrity independently of how clean the hold is at loading. Hatch cover weathertight integrity is tested separately by ultrasonic or hydraulic hose test — the hold inspector and the hatch cover inspector may be different people appointed by different principals.
What happens when a hold is rejected and who bears the cost?
A hold rejection by the cargo inspector suspends loading for that hold. The vessel does not earn freight on unloaded cargo, and time lost to re-cleaning and re-inspection is counted against the vessel as laytime — or as off-hire on a time charter — until the hold passes. The cost of re-cleaning, additional inspections, and any cargo delays flows back to the party responsible for hold condition under the charter party.
Where the owner bears the cleaning obligation and the hold fails, the owner funds the re-clean and the time loss. Where the charterer has instructed a cargo sequence that makes cleaning to the required standard practically impossible in the available port time, the charterer bears the delay cost. Charter party language on hold condition standards and cleaning obligations determines the allocation — disputes are resolved in GAFTA arbitration or London maritime arbitration depending on the governing law.
P&I club cover for cargo damage caused by hold contamination is contingent on the owner having exercised due diligence to present the holds in a condition suitable for the cargo. A hold that fails inspection and is loaded anyway — under commercial pressure — typically results in the P&I club declining cover for resulting cargo damage. The chief officer who allows loading into a hold that has not passed inspection accepts personal liability exposure alongside the commercial exposure of the shipowner.
Frequently Asked Questions
What does grain clean mean for a cargo hold?
Grain clean means the hold is free of all visible cargo residue, dust, loose rust and scale, contamination from previous cargo, and detectable odour. The bilge wells must be clean and the bilge suction operational. The hold must be dry. Grain clean does not require a rust-free surface — tight, stable rust is acceptable provided it is not scaling onto the tank top.
What is the bilge suction test and why does it matter?
The bilge suction test confirms the bilge pump draws down each hold’s bilge well to dry — no blockage in the suction pipe and no debris in the strainer. NCB inspectors require a witnessed bilge suction test before issuing a US grain suitability certificate. A failed bilge suction is an automatic hold rejection regardless of the visual cleanliness of the rest of the hold.
Does SOLAS require holds to be cleaned to grain standard?
SOLAS Chapter VI Regulation 5 requires cargo spaces to be suitable for the safe carriage of the intended cargo, and Chapter VI Part C and the International Grain Code set specific conditions for grain loading. However, the detailed cleanliness grades — grain clean, hospital clean, shovel clean — are trade practice standards set by charter parties and trade associations such as GAFTA and FOSFA, not directly by IMO instruments.
Can seawater be used for hold washing?
Seawater should not be used for hold washing on a vessel loading grain or any food-grade commodity. Seawater leaves a salt residue that is hygroscopic — it absorbs moisture from the atmosphere and creates a damp surface that promotes cargo damage. Some trades prohibit seawater washing explicitly in the charter party. Fresh water is the correct medium for all stages of hold cleaning preceding a grain inspection.
How long does hold cleaning take after a coal cargo?
A hold cleaned after coal to grain standard typically requires 24–48 hours of work in normal conditions, depending on the hold’s structural condition and the crew size. A corroded hold with significant pitting will take longer because coal dust embeds in the rust pockets and cannot be removed by pressure washing alone. Port scheduling must allow for this — a hold presented for NCB or GAFTA inspection after four hours of cleaning on a corroded surface will fail.
What is the difference between GAFTA and NCB hold inspections?
GAFTA inspections apply to grain and feed trade cargoes loaded under GAFTA contracts, primarily in European and international trades. NCB (National Cargo Bureau) inspections are required for US grain exports under USDA regulations and are conducted at US Gulf, East Coast, and Pacific ports. Both assess visual cleanliness, bilge suction, and hold condition, but NCB has specific procedural requirements including a witnessed pump test that GAFTA does not mandate in the same form.
For vessels loading oilseeds and vegetable oils, the FOSFA acceptable previous cargoes assessment applies instead of GAFTA. The FOSFA previous cargoes list classifies previous cargoes into approved, conditionally approved, and prohibited categories. A vessel whose last cargo appears in the prohibited category for the intended FOSFA commodity cannot load that cargo regardless of hold cleanliness.
Who pays for hold cleaning on a voyage charter?
On a standard voyage charter, the owner is responsible for presenting holds in a condition suitable for the agreed cargo — cleaning costs to achieve the required standard are the owner’s account. The charter party may modify this by specifying cleaning as charterer’s risk or by including a ‘holds to be passed clean by inspector at charterer’s time and expense’ clause. The specific wording governs — general principles do not override an express charter party term.
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