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Start with the ship’s class status and previous defects, control every enclosed-space entry, inspect the hull and each hold in a repeatable route, test hatch covers for both operation and weather-tightness, measure steel loss against the applicable class criteria, and escalate significant findings before the vessel loads or sails.
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Why bulk-carrier inspection concentrates on structure and water ingress
Bulk carriers have large holds, deep side structures and extensive hatch openings. A local defect can therefore affect cargo containment, longitudinal strength or the ship’s ability to resist flooding. IMO’s Bulk Carrier Safety guidance identifies the forward cargo-hold region as particularly vulnerable: the bulkhead between numbers 1 and 2 holds and the adjacent double bottom are the most critical areas. If that structure fails, progressive flooding can develop quickly.
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An inspection is not just a search for visible rust. It must determine whether plating, stiffeners, brackets, bulkheads, hatch covers, closing appliances, drainage and detection systems still perform their designed functions. IACS Recommendation 76 (Revision 2, Corrigenda 1, September 2007) provides guidance for surveying, assessing and repairing bulk-carrier hull structures, including common damage mechanisms in cargo-hold regions.
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Who performs which kind of inspection?
Routine observations and statutory surveys have different authority, scope and acceptance criteria. Treating a crew walk-through as a substitute for class or statutory work is unsafe and can leave certificates or loading permissions at risk.
| Inspection type | Typical personnel | Main purpose | Close-up and measurement scope | Acceptance basis |
|---|---|---|---|---|
| Routine shipboard or terminal check | Master’s crew, cargo superintendent or terminal personnel trained under the vessel’s procedures | Find obvious damage, leakage, coating failure, unsafe access or operational defects before and after cargo work | Visual examination of accessible areas; report suspected wastage or cracking for further survey | Vessel procedures, cargo-operation instructions and open class or company defects |
| Class or RO survey, including ESP work | Surveyor from the flag Administration or a recognized organization acting under authorization | Verify structural condition and compliance with class and applicable convention requirements | Survey plan defines close-up areas, thickness-measurement extent, access and required tests; defects can trigger expanded examination | Current class rules, approved survey plan, diminution limits and strength criteria |
| Flag-State statutory survey | Flag Administration or an authorized RO and nominated surveyor | Establish compliance for statutory certificates and applicable codes | Scope and timing follow the relevant convention, code and flag requirements, often coordinated with class | Applicable international instruments and flag-State requirements |
IMO’s crew and terminal guidance (Resolution A.866(20), 1997) recommends regular checks by crews and terminal operators while assigning periodic ESP hull-structure inspections to the flag Administration or an RO. The surveyor’s report, not a routine checklist alone, determines whether a class- or statutory-significant condition is accepted, repaired or restricted.
1. Plan and control the inspection before entering a hold
Planning prevents a hurried walk-through from becoming an unrecorded confined-space entry. Assemble the documents and people needed to make a defensible decision before opening a hatch.
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- Check class status, survey due dates, conditions of class, memoranda, outstanding recommendations and previous survey reports.
- Read repair records, thickness-measurement reports, cargo damage reports and records of recurring leaks or hatch failures.
- Review the intended cargo, loading sequence, density and distribution. The plan identifies which structures will see the highest pressure and whether access will remain available after loading.
- Confirm corrosion-control records, coating specifications, anode or cathodic-protection records where fitted, and recent ballast-tank or hold-cleaning history.
- List open defects and temporary repairs. A temporary doubler, crop-and-renewal area, plugged drain or isolated alarm must be visible to the inspector and tracked to closure.
Set the permit and rescue controls
Cargo holds, ballast tanks, double bottoms and some adjacent spaces are enclosed spaces. Follow the ship’s enclosed-space entry procedure, including a permit, atmosphere testing with a calibrated instrument, ventilation, communications, lighting, fall protection, standby personnel and a rehearsed rescue arrangement. Do not enter solely because a hold was recently ventilated or previously found safe; conditions can change with cargo residues, adjacent tank operations or weather.
Coordinate the master, terminal representative, cargo interests and class or RO surveyor when their attendance is required. Stop work if ventilation fails, readings change, lighting is inadequate, access is damaged or a rescue team cannot reach the entrant. Never improvise a rescue by sending another unprotected person into the space.
Prepare a repeatable route and record system
Use the ship’s frame numbering, strake marks, hold numbers and member names in every note. Prepare a sketch or digital form with fields for frame, side, elevation, member, defect dimensions, photographs, readings, risk, immediate control and responsible party. Number photographs so that each image can be matched to a location and a finding.
2. Examine the external hull, deck and forward vulnerable region
Begin outside where access is safe, then compare external evidence with hold and tank observations. Walk the accessible shell, main deck, hatch-coaming tops, forecastle and deck fittings. Use the same direction and frame sequence on every inspection so a change is detectable later.
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Shell and deck observations
- Look for general corrosion, isolated pitting, grooving at welds, coating breakdown, scale blisters and corrosion runs from leaking fittings.
- Identify cracks in plating or welds, buckling, dents, permanent set, distortion around openings and impact damage from grabs, bulldozers, grabs or grabs’ contact points.
- Check boundaries for water tracks, salt deposits, cargo leakage and damaged or missing sealants.
- Inspect deck fittings, guardrails, ladders, vents, air pipes, sounding pipes and freeing ports for damage that could admit water or obstruct drainage.
- Examine hatch-coaming tops and corners from the deck side, including weld toes, brackets, drain outlets and transitions at hatch ends.
Give the No. 1 and No. 2 hold boundary special attention
Inspect the forward hold, the bulkhead between the two foremost holds and the adjacent double-bottom structure as a connected system. Compare shell deformation, bulkhead plating, lower-stool condition, tank-top evidence and any water or cargo ingress. A defect in one space can be a symptom of loading damage or flooding in another. Escalate buckling, a fracture, a leaking boundary or unexplained water immediately; do not wait for the end of the route.
Compare observations with the vessel’s class records and IACS hull-survey guidance. If access is restricted by cargo or permanent structure, record the inaccessible area and arrange an approved alternative inspection method rather than marking it “satisfactory” without evidence.
3. Inspect each cargo hold from top to bottom
Enter only after the enclosed-space controls are active. Work hold by hold and follow a fixed route so that upper structures are not overlooked when attention shifts to the tank top.
Upper stool, hatch end and transverse bulkhead
Start at the upper stool and hatch-end structure. Examine plating, stiffeners, brackets, welds and transitions for fractures, corrosion grooves, distortion and cargo impact. Continue down each transverse bulkhead, checking vertical and horizontal members, bracket toes, access openings, ladders and handholds. Pay attention to crack-prone changes in stiffness and to areas where cargo can remain trapped against steel.
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Side shell, frames, hopper and topside areas
Inspect side shell plating and frames for wastage, detached brackets, frame tripping, buckling, dents and coating failure. In a single-side-skin hold, examine the exposed shell frames and their connections; in a double-side-skin arrangement, inspect the accessible inner boundary and note any space that cannot be seen without a separate tank entry. Check hopper and topside tanks, longitudinal connections and brackets for corrosion concentration at drainage paths and welds.
Tank top, brackets and lower structure
Walk the tank top where safe. Look for plate grooving, local dents from cargo equipment, cracks at stools or brackets, loose fittings and standing water. Check longitudinal members, lower stools, bracket toes and the areas around bilge wells. Cargo residues can conceal small fractures, so cleaning may be necessary before a close-up examination.
Bilge wells, piping and drainage
Verify that bilge wells are clear, covers or strainers are fitted, suction arrangements are intact and alarms or level indicators operate as designed. Inspect drain lines, non-return arrangements, sounding pipes, air pipes and exposed cargo-hold piping for corrosion, leakage, unsupported spans and impact damage. IRS checklist guidance calls for examination of piping in cargo holds, ballast and adjacent spaces and operational testing to working pressure where applicable.
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Corrosion protection and ingress evidence
Record coating breakdown by location and extent, not merely as “rusty.” Distinguish light surface corrosion from deep pitting, grooving or scale that reduces section. Look for wet cargo, salt streaks, rust weeps, mud lines and fresh water marks that indicate leakage through a boundary or hatch. Photograph representative good and poor areas to support repair planning.
When to expand to close-up examination
A general examination that reveals fractures, substantial corrosion, deformation, detached brackets or repeated coating failure requires a closer look at the affected shell frames and adjacent plating. The survey may also require close-up examination in other holds, depending on the survey plan, the vessel’s age and the pattern of damage. Mark the limits of the affected area and measure its dimensions before cleaning or temporary repair changes the evidence.
4. Inspect hatch covers and coamings for strength, operation and sealing
Hatch-cover inspection is both structural and functional. A panel that looks intact can still leak if compression is uneven, drains are blocked or securing appliances do not hold the cover down.
Cover panels and primary structure
- Inspect plating, stiffeners, webs, brackets and welds for corrosion, cracks, buckling, dents and permanent set.
- Check panel edges, landing pads, wheels or rollers, hinges, guides, stoppers and end plates for wear or distortion.
- Examine drain channels, drain holes, non-return arrangements, compression bars and adjacent coaming surfaces for blockage, wastage or damage.
- Look for cargo residue or paint build-up on landing surfaces that prevents correct fit.
Coamings and corners
Inspect coaming plating, stays and brackets, with special attention to corners and hatch-end transitions where stress and corrosion commonly concentrate. Check weld toes, scallops, drain outlets and areas where deformation can stop a cover from landing evenly. IACS Unified Requirement S21 addresses scantling evaluation of hatch covers and coamings; use the vessel’s approved design and class requirements when judging wastage or deformation.
Closing appliances, drives and stowage
Operate mechanically driven covers through their full safe travel under controlled conditions. Confirm that hydraulic cylinders, wire drives, chains, wheels, tracks, hinges, guides, cleats, locking devices and stoppers move without binding or abnormal noise. Verify that panels align, close evenly and stow in the designated position without overloading a stop or damaging a neighboring panel.
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Gaskets and weather-tightness
Inspect gasket condition, joints, hardness, cuts, permanent set and continuity around each panel. Confirm that compression bars contact the gasket consistently and that drains are open. Use the class or manufacturer procedure for proving sealing effectiveness. A hose test or chalk test alone may not satisfy the survey plan or reveal every failure mode; do not substitute one test for another without approval.
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5. Take hull-thickness measurements that class can use
Thickness measurement quantifies steel loss; it does not replace visual examination. The approved survey plan identifies the members, frames, strakes, number of readings and any representative or suspect areas that must be measured.
Select an accepted instrument and qualified operator
A portable ultrasonic thickness gauge for ship hulls is commonly used when its range, probe and calibration are suitable for marine steel and accepted by the class or RO. Verify calibration traceability, probe condition, coating-compensation capability, data logging and the operator’s qualification before taking readings. The instrument certificate alone does not make a report acceptable; the survey plan and the attending organization determine what is recognized.
Prepare the measurement point
- Identify the frame, strake, member and side on the sketch or digital form.
- Remove loose scale, marine growth, cargo residue or coating as required by the instrument and survey procedure.
- Check that the surface is stable and that access, lighting and fall protection allow the probe to be placed squarely.
- Calibrate or verify the gauge with the specified reference block and record the settings, probe and date.
- Take readings at the prescribed locations, repeating anomalous values and recording the surface condition.
Interpret loss against the correct criteria
Compare each result with the applicable diminution limits and longitudinal-strength criteria in the building rules or current class rules identified by the survey plan. A percentage loss calculated against an outdated scantling can produce the wrong decision. Where readings approach a limit, increase the measurement density as directed by the surveyor and assess the surrounding structure, not just the single lowest value.
Record original or rule thickness where available, measured thickness, calculated diminution, location and uncertainty. Link every reading to a photograph or sketch when practical. Unreadable, inaccessible or unverified points must be identified as such and resolved through an approved method.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.6. Test detection, bilge, drainage and hatch systems
Structural condition and system operation are interdependent. A sound hold can still become unsafe if water detection or drainage fails.
- Test water-level detection devices and alarms where fitted, using the vessel’s approved test method and recording the alarm response.
- Operate hatch-cover hydraulic, electrical, wire or chain drives and verify controls, emergency stops, indicators and abnormal leakage.
- Check bilge pumps, suctions, strainers, non-return valves and remote indications; confirm that discharge arrangements are not blocked.
- Test relevant piping for tightness or working-pressure performance when class or the survey plan requires it.
- Verify sounding arrangements, pipe caps, air pipes and drain paths, including discharge points that could be obstructed by paint or cargo.
Keep people clear of moving panels and pressurized equipment. Isolate energy before reaching into a drive, track or hinge. Record the test medium, pressure or operating condition where the procedure requires it, along with any leak, slow movement or alarm delay.
7. Classify findings, apply immediate controls and escalate
Use a defect log that lets another person find the condition without relying on memory.
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| Record field | What to capture |
|---|---|
| Location | Hold or tank, frame, side, strake, panel, member and elevation |
| Description | Crack, wastage, pitting, buckling, dent, detached bracket, leakage, coating failure or operational fault |
| Extent | Length, width, depth, affected area, number of fittings or measured dimensions |
| Evidence | Photograph numbers, sketches, thickness readings, test results and surface condition |
| Risk and control | Immediate hazard, restricted access or loading, isolation, temporary seal, cleaning or monitoring requirement |
| Disposition | Repair recommendation, responsible party, due date, surveyor notification and reinspection requirement |
Tell the master and company promptly when a finding affects watertight or weather-tight integrity, structural strength, safe access, cargo operations or pollution prevention. Refer class-significant or statutory defects to the flag Administration, RO or nominated surveyor. IMO states that these authorities issue certificates after surveys and verification establish compliance with applicable conventions and codes; a shipboard log cannot replace that decision.
Use practical escalation triggers
- Stop and make safe: active flooding, a suspected through-crack, unstable structure, uncontrolled hatch movement, failed atmosphere control or an unsafe access route.
- Restrict operation pending advice: severe hatch leakage, buckled or fractured primary members, major frame detachment, unexplained water in a hold or readings near or below the applicable limit.
- Plan repair and monitor: localized coating breakdown, early pitting, minor gasket damage or noncritical drainage defects that do not compromise current operations, provided the responsible authority accepts the control.
8. Repair follow-up and reinspection
Repairs must match the approved structural design and the surveyor’s instructions. Crop-and-renewal, insert plates, doublers, bracket replacement, weld repairs and hatch-cover alignment can alter load paths; do not choose dimensions or materials solely from a generic catalog.
After repair, remove temporary controls only when the responsible surveyor or company procedure permits. Reinspect welds, surrounding plating, coating, gasket compression, drain paths and operational movement. Repeat thickness readings or non-destructive examinations required by the repair specification. Update drawings, defect logs, photographs, class records and maintenance schedules so the next inspection starts with an accurate history.
Replacement hatch gaskets and securing hardware must match the approved design for dimensions, profile, material and compression. A thicker or softer substitute can prevent proper closure even if it appears to improve sealing.
9. Cargo density and age conditions that can change survey attention
Inspection scope depends on the ship’s design, age, cargo and survey status. A UK Maritime and Coastguard Agency notice, MGN 668 (2022), describes an additional survey condition for certain older single-side-skin bulk carriers carrying solid bulk cargo at or above 1,780 kg/m³. That threshold applies to the specified ships and condition in the notice; it is not a universal loading limit for every bulk carrier.
IMO’s Bulk Carrier Safety material also describes a historical compliance timetable for ships that were 20 years old on 1 July 1999. That date belongs to the historical 1999 amendments and should not be treated as a current blanket age rule. Confirm today’s requirements with the flag Administration, RO and the vessel’s class status.
Quick Recap
10. A field checklist for the inspection team
- Class status, survey plan, previous reports, repair history and open conditions reviewed.
- Cargo and loading plan checked, including density, sequence and access restrictions.
- Master, terminal, company and surveyor responsibilities agreed.
- Enclosed-space permit, atmosphere test, ventilation, communications, lighting, fall protection and rescue arrangements active.
- External shell, deck, fittings and forward No. 1/No. 2 hold boundary examined.
- Each hold inspected from upper stool and hatch end through bulkheads, frames, hopper, topside, tank top, brackets, bilge wells and drains.
- Piping, sounding, drainage, bilge and water-detection arrangements checked and tested as required.
- Hatch panels, coamings, welds, stiffeners, wheels, tracks, hinges, guides, stoppers, cleats, drives, drains, compression bars and gaskets examined.
- Hatch covers operated through safe travel, aligned, secured and stowed correctly.
- Thickness readings taken with calibrated equipment by qualified personnel at plan-defined locations.
- Results compared with current diminution and strength criteria, with expanded readings where defects warrant.
- Every defect linked to a location, dimensions, photographs, readings, risk, control, repair owner and due date.
- Class, RO, flag Administration or nominated surveyor notified whenever the condition is significant or the survey plan requires attendance.
- Repairs verified, records updated and affected areas reinspected before restrictions are lifted.
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