What Regulation 14 actually requires
Regulation 14 of the revised MARPOL Annex II, adopted by Resolution MEPC.118(52) and in force from 1 January 2007, does one thing: it makes the Procedures and Arrangements Manual mandatory and binding. The operative text requires that every ship certified to carry noxious liquid substances in bulk shall be provided with a Manual approved by the Administration, that the Manual shall have a standard format set by the Standards developed by the Organization, and that the crew shall operate in accordance with the procedures the Manual contains. Those three clauses carry the whole weight of the regulation: a Manual must exist, it must match an approved standard form, and people must follow it.
This is a documented-procedures regulation, not a hardware or a discharge regulation. It’s the difference between a wiring diagram, a fuse rating, and the operator’s manual that tells you which switch to throw and in what order. The fuse rating lives in Regulation 12: pumping, piping, stripping arrangements, and the residue ceiling. The discharge rules live in Regulation 13: prewash, at-sea discharge conditions, ventilation in lieu of prewash. Regulation 14 is the operator’s manual that binds those two into a sequence a cargo officer can execute and a surveyor can audit.
The reason the regulation exists separately is practical. Annex II sets generic duties, but no two chemical tankers are identical. A 19,000-deadweight stainless-steel parcel tanker with 40 segregated tanks, deepwell pumps, and a programmable tank-cleaning system runs a different prewash sequence than a 6,000-deadweight coated-tank product carrier with a handful of tanks. The Manual is where the generic duty becomes a specific, executable procedure for one hull. Get the chemical-tanker right at the document level and the Annex II regime becomes operable; get it wrong and the crew has no defensible procedure to point to during a port-state inspection.
The Manual is not advisory. The phrase “operate in accordance with” is the enforcement language. A crew that deviates from the approved procedure, even toward a stricter outcome, is operating outside the approved document and exposes the ship to a finding. The correct path when the approved procedure can’t be followed is to record the deviation and the reason in the Cargo Record Book, not to improvise a substitute procedure that the Administration never saw.
The standard format: MEPC.18(22) and MEPC.119(52)
The format the Manual must follow is not freeform. Two IMO resolutions set it. Resolution MEPC.18(22), adopted at the 22nd session of the Marine Environment Protection Committee in 1985, established the original Standard format for the Procedures and Arrangements Manual under the pre-2007 Annex II. The “(22)” in the identifier marks the session number, the convention IMO uses across the whole MEPC resolution series. That original standard governed P&A Manuals through the A/B/C/D category era.
The revision came in October 2004. Resolution MEPC.119(52), adopted at the 52nd MEPC session alongside the revised Annex II in MEPC.118(52), updated the standard for the Manual to match the new X/Y/Z/OS category structure, the new residue limits, and the revised Cargo Record Book. MEPC.119(52) replaced the legacy category-based residue limits in the Manual with the pumping and stripping efficiency test that now defines the maximum allowable residue: 75 liters in a tank and its associated piping for a ship built on or after 1 January 2007. The revised standard format is carried as Appendix 4 of the consolidated Annex II.
The format is prescriptive about what the author may and may not change. Where the standard text is printed in roman type, it must be copied into the Manual without modification: this is the generic regulatory frame, identical on every ship. Where the standard text is printed in italics, the author must replace it with ship-specific information: tank capacities, pump types, machine positions, cargo lists. Where a section doesn’t apply to a particular ship, “N/A” is entered rather than deleted, so the numbering stays fixed across the whole fleet. That fixed numbering is what lets a port-state inspector or a transferring class surveyor open any compliant Manual and find the prewash procedure in the same section every time.
This roman-versus-italic discipline matters for approval. A class surveyor reviewing a draft Manual checks first that the roman boilerplate is verbatim and the section numbering is intact, then that every italic placeholder has been filled with information consistent with the ship’s plans and its IBC Code certificate. A Manual that paraphrases the roman frame, or that renumbers sections to suit a particular shipyard’s preference, fails the format check before the technical review even starts.
Mandatory contents of the Manual
The Manual’s contents follow the Appendix 4 standard format. Each section answers a specific operational question, and together they cover the full cargo cycle from loading through residue disposal. The list below names what the Manual must carry; the prewash and stripping detail lives in Regulation 13 and Regulation 12 respectively and isn’t repeated here.
- Main features of MARPOL Annex II. The roman-type frame: the category definitions, the discharge criteria, the prewash trigger logic. This is the part copied verbatim so that the ship-specific procedures sit inside the correct regulatory context.
- Description of the ship’s equipment and arrangements. Tank-by-tank capacities, coatings, the cargo-handling pipe system, the pumps, the stripping system, the tank-washing machines and their positions, the slop-tank arrangement, the reception-facility connection point, and the ventilation fans. This is the ship-specific platform every later procedure references.
- Cargo unloading and tank-stripping procedures. The line-up, the unloading sequence, the stripping run that brings residue down to the Regulation 12 ceiling. The numbers (75 liters for post-2007 hulls, the legacy tiers for older ships) come from Regulation 12; the Manual records how this ship achieves them.
- Prewash procedures. For Category X cargoes and for high-viscosity and solidifying Category Y cargoes: the wash pattern, cycle count, wash-water temperature, expected wash-water volume, and the route to the slop tank or reception manifold. The trigger logic is Regulation 13’s; the executable sequence is the Manual’s.
- Ventilation procedures. For non-soluble Category Y and Z residues eligible for ventilation in lieu of prewash under Regulation 13.3: which fans, the certified air-flow rate, the duration, and the dryness-verification method.
- Discharge procedures and the list of NLS the ship may carry. The conditions for any at-sea discharge of tank washings, and the cargo annex: the substances the ship is certified to carry, drawn from the IBC Code Chapter 17 list and matched to the Certificate of Fitness.
The list of NLS is the section a cargo officer checks first on receiving a fixture nomination. A substance on the bill of lading that doesn’t appear in the Manual’s cargo annex can’t be loaded. The annex isn’t a wish list of trades the owner might enter; it’s the operative, approved set, and it has to agree with the certificate cargo annex line for line.
The stripping-quantity and procedure section
The Manual’s stripping section is where Regulation 12 and Regulation 14 meet. Regulation 12 fixes the ceiling: a ship built on or after 1 January 2007 may leave no more than 75 liters of residue in a cargo tank and its associated piping after unloading and stripping, verified by the performance test in Appendix 5 of Annex II. Ships built between 1 July 1986 and 31 December 2006 are held to 100 liters for Category X or Y and 300 liters for Z; ships built before 1 July 1986 to 300 liters for X or Y and 900 liters for Z. Those are the numbers. The Manual is where the ship-specific stripping procedure that hits them is written down.
The performance test result goes into the Manual. During the build or conversion survey, the recognized class society runs the Appendix 5 test with water as the test medium, measures the residual quantity left after the prescribed stripping run, and compares it against the build-date ceiling. The measured figure and the test conditions are recorded in the Manual’s stripping section. That record is the commissioning baseline: it states what the cargo system achieved on the day it was certified, against which in-service performance is judged.
In service, meeting the ceiling is an operational duty, and the Manual is the procedure that discharges it. The stripping section describes the line-up, the order in which tanks and lines are cleared, the educator or stripping-pump operation, and the cargo-control-room checks that confirm the system was run to completion. A cargo officer who follows the documented stripping procedure has a defensible basis for the residue figure entered in the Cargo Record Book; one who improvises does not. The tanker stripping calculator gives a working tool for checking residue quantities against the 75-liter standard, but the governing figures for any specific ship are the ones in its approved Manual.
The stripping section also feeds the prewash decision downstream. Whether a Category X residue needs a prewash, and how many cycles that prewash runs, depends on how much residue the stripping run left behind. A cargo system that strips well leaves less for the prewash to remove; one that strips poorly pushes the prewash past its nominal cycle count. The Manual’s stripping and prewash sections are written to be read together, which is why the standard format keeps them adjacent.
Tank-washing and prewash procedures
The prewash section is the operational core of the Manual for a Category X trade. Regulation 13.1 requires that a tank used to carry a Category X NLS be prewashed before the ship leaves the port of unloading, with the effluent landed to a reception facility until the concentration of the substance at the facility inlet is at or below 0.1 percent by volume. Regulation 14’s Manual is where that duty becomes an executable wash procedure for the specific tank and the specific machine arrangement.
For each cargo group, the prewash section specifies the wash machines used and their positions, the cycle pattern (number of cycles, nozzle positions, cycle time), the wash-water temperature where elevated temperature is required, the expected wash-water volume, and the route the effluent takes from the tank through the cargo system to the slop tank or directly to the reception-facility manifold. The end-point sampling point is named, so the surveyor attending the discharge knows where to draw the sample that demonstrates the 0.1 percent concentration.
For high-viscosity and solidifying Category Y cargoes, the prewash section carries heating detail. A solidifying cargo is heated throughout the loaded passage, and the prewash is performed with heated wash water to keep residue mobile and reach the end-point in the certified cycle count. The 2019 amendments under MEPC.315(74), in force 1 January 2021, extended the prewash regime to persistent floating products: substances with a viscosity at or above 50 mPa.s at 20 degrees C, or a melting point at or above 0 degrees C, are treated as high-viscosity or solidifying substances for prewash purposes in named sea areas, and the amendment revised the Appendix 4 standard format to suit. A Manual that lists a solidifying cargo without a documented heating procedure for it isn’t a complete approval for that cargo.
The prewash detail isn’t repeated here because Regulation 13 carries the full treatment of the prewash trigger logic, the 0.1 percent end-point, the reception-facility-not-available exemption, and the at-sea discharge conditions. What matters for Regulation 14 is that the procedure exists in the Manual, that it’s been approved, and that the crew executes it as written. The tanker purging calculator supports the operational planning side of tank preparation, but the binding cycle counts and volumes are the ones in the approved Manual.
Ventilation procedures for high-viscosity and solidifying substances
The Manual’s ventilation section covers two distinct uses, and the standard format keeps them apart. The first is the ventilation procedure that Regulation 13.3 permits in lieu of prewash for non-soluble Category Y and Z residues: a residue that won’t dissolve but will evaporate can be removed by ventilating the tank atmosphere to open air rather than by washing and landing effluent. The Manual records which fans are used, the certified air-flow rate (typically expressed as a minimum number of air changes per unit time per cubic meter of tank atmosphere), the procedure duration, and how dryness is verified at the end. This option is common for low-viscosity volatile aromatics such as toluene and the xylenes; it’s ruled out for vegetable oils and aqueous solutions, where low vapor pressure and water-solubility make ventilation ineffective.
The second use is the heating-and-ventilation context for high-viscosity and solidifying substances. These cargoes don’t qualify for the ventilation-in-lieu-of-prewash route, because they solidify rather than evaporate, so they go through the heated prewash described above. But the Manual still carries ventilation detail for them: the tank-ventilation arrangement used to gas-free a tank for entry, the fan ratings, and the interaction with the cargo-heating system. The standard format places the ventilation arrangement description in the equipment section and the operational ventilation procedure in its own section, so the two readings of “ventilation” don’t get confused on the page.
The certified air-flow rate is the figure a port-state inspector checks. A Manual that claims a ventilation procedure under Regulation 13.3 must state the fan capacity that supports it, and that capacity must match the ship’s actual fans as recorded in the equipment section and confirmed at survey. A ventilation procedure that names an air-flow rate the installed fans can’t deliver is a documentary defect, and the residue then has to be prewashed instead. The dryness-verification step, normally a visual inspection at the conclusion of ventilation, is logged in the Cargo Record Book under the code for cleaning other than mandatory prewash.
Discharge procedures and the list of NLS the ship may carry
The discharge section ties the Manual to the at-sea operational discharge regime. Where a standard Category Y or Category Z residue may lawfully be discharged at sea, Regulation 13 sets the cumulative conditions: the ship en route at a speed of at least 7 knots if self-propelled (4 knots if not), discharge below the waterline through an underwater discharge outlet, in water at least 25 meters deep, and at least 12 nautical miles from the nearest land. The Manual’s discharge section describes how this ship meets those conditions: the underwater discharge outlet location, the line-up, the dilution arrangement, and the control-room monitoring. The conditions are Regulation 13’s; the ship-specific execution is Regulation 14’s.
The list of NLS the ship may carry is the section with the most operational consequence. It’s drawn from the IBC Code Chapter 17 cargo list and must be consistent with the cargo annex of the Certificate of Fitness or the NLS Certificate. Each entry carries the substance name as listed in Chapter 17, its MARPOL category, and any ship-type or carriage condition that applies. A cargo officer treats this list as the authoritative answer to “can we load this?” The answer is binary: on the list, with the tank and coating that suit it, the cargo can be loaded; off the list, it can’t, until the Manual and the certificate are reissued.
The cargo annex isn’t a static document. As an owner enters new trades, cargoes are added; as a coating ages or a tank is repurposed, cargoes may be dropped. Each change requires a class-society review against the standard format and a reissue of both the Manual and the certificate. The discipline that keeps this honest is the cross-check: the Manual’s cargo annex, the certificate’s cargo annex, and the cargo on the most recent bill of lading must all agree. A mismatch among the three is the most common Annex II documentary finding in port-state inspections of chemical tankers.
Approval by the flag Administration
Regulation 14 vests approval of the Manual in the flag Administration. In the great majority of cases the Administration delegates that approval to a recognized organization, which for chemical tankers means an IACS member classification society acting under a delegation agreement with the flag state. The class society reviews the draft Manual against the standard format in MEPC.18(22) as revised by MEPC.119(52), checks the ship-specific content against the ship’s approved plans, runs or witnesses the Appendix 5 stripping performance test, and on satisfactory review issues the approval that lets the Manual enter service.
Approval is not a one-time event. The Manual is approved against a defined basis: a set of plans, a coating schedule, a pump and machine arrangement, a cargo annex. When any element of that basis changes, the approval no longer covers the ship as it now stands, and the Manual must be reissued and re-approved. A new cargo on the certificate, a cargo dropped, a tank recoated, a tank-washing machine replaced, a structural modification to the cargo block: each triggers a fresh class review and a new revision number on the Manual. The same applies when the standard itself is amended, as it was by MEPC.315(74) in 2019 (in force 1 January 2021), which brought persistent floating products into the prewash regime and revised the Appendix 4 standard format; operators reissuing Manuals to that standard need class review of the affected prewash and discharge procedures for the cargoes concerned.
The class societies maintain harmonized review procedures so that an approval issued by one society is recognized when a ship transfers to another, subject to flag-state confirmation. This harmonization rests on the IACS Unified Interpretation set for Annex II, which aligns the societies on the format check, the stripping-test method, and the prewash and ventilation procedure content. DNV reviews chemical tankers under its Chemical Product Tankers rule set; Lloyd’s Register under Part 7 of its classification rules; ABS under Part 5 of the Steel Vessel Rules; Bureau Veritas under NR 482; and the other IACS members under their equivalent chemical-tanker chapters. A Manual that passes one society’s harmonized review carries across to another without re-doing the underlying engineering, which is what makes secondhand chemical-tanker transfers workable without a fresh build-survey-grade review of the cargo system.
The link to the Certificate of Fitness and the NLS Certificate
An approved P&A Manual is a precondition of the ship’s pollution-prevention certification, which is the mechanism that gives Regulation 14 its teeth. Two certificate regimes are in play, depending on what the ship is. A dedicated chemical tanker built to the IBC Code carries an International Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk, issued under SOLAS Chapter VII and the IBC Code, with a cargo annex listing the substances the ship may carry. A ship that carries NLS but isn’t a full IBC Code chemical tanker carries an International Pollution Prevention Certificate for the Carriage of Noxious Liquid Substances in Bulk, the NLS Certificate, under Annex II.
In both cases, the certificate can’t be issued or endorsed without an approved Manual. The surveyor issuing the Certificate of Fitness confirms that the ship has a current, approved P&A Manual whose cargo annex matches the certificate’s cargo annex. The two documents are a matched pair: the certificate states what the ship is permitted to carry, and the Manual states how it carries and discharges it lawfully. A certificate without a backing Manual is incomplete, and a Manual whose cargo annex has drifted out of step with the certificate is a finding.
This pairing is why a cargo addition is never a single-document change. Adding a cargo to a chemical tanker’s trade means the class society reviews the tank, the coating, and the cargo-handling arrangement for that substance; updates the Manual’s cargo annex and any prewash or ventilation procedure the cargo needs; and the flag Administration or its delegate reissues the Certificate of Fitness with the substance added to its annex. The Manual and the certificate move together, and the Cargo Record Book then records the first carriage of the new cargo against the revised pair. The IBC Code sets the construction and equipment standard the certificate attests to; the Manual is how the procedures that match that construction are documented.
Crew obligation: operating in accordance with the Manual
The phrase “the crew shall operate in accordance with the procedures contained in the Manual” is the operative duty of Regulation 14, and it’s what separates an approved document from an enforced one. The Manual isn’t a reference shelf-copy. It’s the procedure the officer of the cargo watch is required to follow during loading, unloading, stripping, prewash, ventilation, and discharge. A deviation from the approved procedure is a deviation from the regulation, and the burden is on the ship to show that what it did was either within the Manual or a properly recorded and justified exception.
The Cargo Record Book is where compliance with the Manual is evidenced. Each operation the Manual governs is logged under the relevant operation code: loading, internal transfer, unloading, mandatory prewash, other cleaning and ventilation, at-sea discharge of washings, ballasting, deballasting, and exceptional discharge. The prewash entry records the cycle pattern, wash-water volume and temperature, the end-point sample concentration, and the reception-facility receipt: the same parameters the Manual specifies. An entry that matches the Manual’s procedure is self-corroborating; one that doesn’t invites the inspector to ask why the crew departed from the approved procedure. The master’s countersignature on each entry is the personal attestation that the recorded operation is true, and falsification under that countersignature is a criminal offense under most flag-state legislation and under the United States Act to Prevent Pollution from Ships, 33 U.S.C. section 1908.
Where the approved procedure can’t be followed, the rule is to record and justify, not to substitute. If a wash-water heater fails on a solidifying cargo and the prewash can’t meet specification, the master logs the failure and retains the residue until heating is restored or a shore-side heated-water supply is available, rather than running an unapproved cold-wash procedure. If the reception facility at the unloading port can’t accept the prewash effluent, the master seeks the Regulation 13 exemption in writing from the flag Administration and records it, rather than discharging the residue at sea. The Manual defines the lawful procedures; the lawful response to a procedure that can’t be executed is documented in the Cargo Record Book, not invented on the cargo deck.
The training implication is direct. A crew can only operate in accordance with a Manual they know, so familiarization with the ship’s specific P&A Manual is part of the cargo officer’s handover. The Manual a new chief officer joins is not generic Annex II text; it’s the procedure for this hull, with this tank arrangement, this machine set, and this cargo annex. The officer who treats it as boilerplate and runs a remembered procedure from the last ship is the officer who produces the Cargo Record Book entry that doesn’t match the approved Manual.
How Regulation 14 differs from Regulations 12 and 13
The three regulations are easy to conflate because they all concern the same cargo cycle, but they answer different questions, and the distinction is the heart of understanding Regulation 14. Regulation 12 is about hardware and quantity: it sets the pumping, piping, and stripping arrangements and the maximum residue a tank and its piping may retain after stripping (75 liters for post-2007 hulls). It answers “how much residue may be left, and what equipment achieves that?”
Regulation 13 is about discharge control: the mandatory prewash for Category X and high-viscosity solidifying Category Y residues, the 0.1 percent end-point, the ventilation procedure in lieu of prewash, and the cumulative conditions for any at-sea discharge of washings. It answers “what may be discharged, where, and after what treatment?”
Regulation 14 is about documentation and execution: it requires that the Regulation 12 quantities and the Regulation 13 procedures be written into one approved, ship-specific Manual, in the standard format, and that the crew operate by it. It answers “where is the approved procedure, and who is bound to follow it?” The numbers come from Regulation 12; the discharge rules come from Regulation 13; the Manual that holds both and binds the crew is Regulation 14.
A short way to hold the distinction: Regulation 12 is the fuse rating, Regulation 13 is the discharge rule, and Regulation 14 is the operator’s manual that puts both into the cargo officer’s hands. A ship can satisfy the Regulation 12 hardware standard and still fail Regulation 14 if its Manual is out of date, unsigned by the Administration, or inconsistent with the certificate. The hardware can be compliant while the document is not, and the document is what the crew operates by.
Where Regulation 14 sits in the Annex II document set
Regulation 14 is one of four document-and-procedure regulations that a chemical tanker’s officers work with daily, and it helps to see how they connect. The P&A Manual (Regulation 14) is the approved procedures instrument. The Cargo Record Book (Regulation 15) is the running operational log that records compliance with those procedures. The Shipboard Marine Pollution Emergency Plan for NLS (Regulation 17) is the spill-response plan. The reception-facility regime (Regulation 18) sets the shore-side infrastructure the prewash duty depends on. The four are separate documents that reference one another, and a port-state inspection of a chemical tanker samples all of them.
The Manual also sits on top of the construction and categorization framework. The IBC Code sets the tank arrangement, materials, and equipment standard the ship is built to, and Chapter 17 of the IBC Code carries the authoritative cargo list with each substance’s MARPOL category assigned from GESAMP hazard profiling. The category an NLS receives, and so the prewash and discharge procedure the Manual must carry for it, isn’t a judgment the cargo officer makes; it’s fixed in Chapter 17. The Manual’s cargo annex is a subset of that list: the substances this particular ship’s construction and coatings can safely carry, certified on the Certificate of Fitness.
This layering is why a P&A Manual review touches several documents at once. The class surveyor approving a Manual revision is checking it against the ship’s IBC Code plans, the Chapter 17 categories, the Certificate of Fitness cargo annex, and the standard format. A change in any of those can force a Manual revision, and a Manual revision can in turn force a certificate reissue. The documents form a chain, and Regulation 14 is the link that holds the executable procedures.
PSC inspection of the P&A Manual
Port-state control treats the Manual as a primary documentary target on chemical tankers. Inspections under the Tokyo MoU, the Paris MoU, the USCG, and the parallel regional regimes run three tests against Regulation 14 and its neighbors. The first is Manual currency: the inspector verifies that the Manual on board is the current approved revision, that its cargo annex matches the Certificate of Fitness or NLS Certificate cargo annex, that the most recently loaded cargo appears on both, and that the Manual’s revision number tracks the most recent flag or class approval letter. A Manual that wasn’t reissued after a structural modification, a recoating, or a certificate cargo addition is the most common Regulation 14 finding.
The second test is consistency between the Manual and the Cargo Record Book. The inspector samples a recent prewash entry and traces it back to the procedure in the Manual: did the cycle count, the wash-water volume and temperature, and the end-point sampling point match what the Manual specifies? A Cargo Record Book entry that records a procedure the Manual doesn’t contain is a high-severity finding, because it shows either that the crew departed from the approved procedure or that the Manual doesn’t reflect how the ship actually operates. Either way, the “operate in accordance with the Manual” duty has been broken.
The third test is operability. In a more detailed inspection the officer may be asked to demonstrate or describe the prewash or stripping procedure from the Manual, confirming that the named machines, fans, and pumps exist and work as the Manual claims. A Manual that describes a tank-washing arrangement the ship doesn’t have, or a ventilation air-flow rate the fans can’t deliver, fails this test. Across Annex II detentions, findings cluster on Manual currency and Cargo Record Book consistency rather than on operability, because the documentary defects are visible without running cargo equipment, and they’re the ones an inspector can establish in a port call. The SIRE tanker inspection regime adds a commercial vetting layer that checks the same documents, so a Manual that’s out of step with the certificate fails both the regulatory and the commercial review.
Commercial and operational consequences of the Manual
The Manual’s cargo annex sets the commercial envelope of the ship. An owner can only fix cargoes that appear on the annex, so the breadth of the annex is a direct measure of the ship’s earning flexibility in the chemical-parcel trade. A tanker certified for a wide range of Category X and high-viscosity Category Y cargoes commands a different market position than one whose annex is limited to a handful of clean petrochemicals. Adding a cargo to the annex is therefore a commercial decision with an engineering cost: the class review, the procedure development, the Manual revision, and the certificate reissue all have to be done before the first parcel can be lifted.
The Manual also governs how a multi-cargo parcel voyage is sequenced. The prewash, ventilation, and discharge procedures the Manual carries determine the order in which cargoes can be loaded into a given tank, which tanks can carry which substances, and where the residues from each must be landed. A cargo planner building a multi-leg parcel itinerary works inside the Manual’s procedures: the load-on-top and intermediate-cleaning sequences the Manual permits, the slop-tank capacity the Manual describes, and the reception-facility connections the Manual specifies. A plan that can’t be executed within the Manual’s approved procedures isn’t a plan the ship can lawfully carry out.
When something goes wrong, the Manual and the Cargo Record Book together form the evidentiary record. If a cargo claim or a flag-state prosecution later disputes whether the ship handled a residue correctly, the question is whether the crew followed the approved procedure, and the answer is reconstructed from the Manual revision in force at the time and the matching Cargo Record Book entries. The supporting document set, the cargo certificate of quality, the bill of lading, the surveyor’s prewash sample report, and the reception-facility receipt, is preserved alongside the Cargo Record Book through its three-year retention period. That set is the chain of evidence that proves, or fails to prove, operation in accordance with the Manual.
Amendments to the standard: MEPC.315(74) and persistent floating products
The standard format the Manual follows was amended after the 2004 revision to bring a new class of cargo into the prewash regime. Resolution MEPC.315(74), adopted 17 May 2019 and in force from 1 January 2021, recognized persistent floating products: substances that float on the sea surface and resist dispersal, including some vegetable oils and paraffin-like cargoes that solidify or thicken under ambient conditions. The amendment treats a persistent floating product with a viscosity at or above 50 mPa.s at 20 degrees C, or a melting point at or above 0 degrees C, as a high-viscosity or solidifying substance for prewash purposes.
MEPC.315(74) added prewash and discharge-to-reception requirements to Regulation 13 for these products in named sea areas: North West European waters, the Baltic Sea area, Western European waters, and the Norwegian Sea. The residue and water mixture generated during the prewash must be discharged to a reception facility at the port of unloading until the tank is empty. Because the requirement is procedural and ship-specific, the amendment also revised the Appendix 4 standard format for the Procedures and Arrangements Manual, so a Manual approved to the pre-2021 format may not cover a ship that carries persistent floaters into the affected areas.
The practical effect for an operator is that a Manual approved before 1 January 2021 may not satisfy a current inspection if the ship carries persistent floating products in the listed waters. A reissue to the MEPC.315(74) standard needs class review of the prewash and discharge procedures for each affected cargo and the matching update to the cargo annex. Operators should always work to the consolidated edition of Annex II current at the date of any audit and check the latest MEPC session for resolutions adopted but not yet incorporated into the printed consolidation. The standard the Manual follows is a moving target, and a Manual is only as current as its last approved revision.
A worked sequence: Category X discharge governed by the Manual
Consider how the Manual governs a single Category X discharge, to make the abstract duty concrete. A parcel tanker discharges an acrylonitrile cargo, a Category X NLS, at a terminal. Before the ship leaves, Regulation 13.1 requires a prewash with the effluent landed to reception until the facility-inlet concentration is at or below 0.1 percent by volume. The cargo officer doesn’t decide the prewash procedure on the spot; the officer opens the Manual to the prewash section for that cargo group and reads the approved procedure: the wash machines and positions, the cycle count, the wash-water temperature, the expected volume, and the route to the slop tank or reception manifold.
The officer runs the stripping procedure from the Manual’s stripping section first, bringing residue down to the Regulation 12 ceiling, then runs the prewash cycles the Manual specifies. An attending surveyor draws the end-point sample at the facility inlet named in the Manual, confirming the 0.1 percent concentration. The reception facility issues a receipt for the landed effluent. Every parameter, the cycle pattern, the cumulative wash-water volume, the temperature, the end-point sample concentration, and the reception-facility receipt details, is entered in the Cargo Record Book under the mandatory-prewash code, signed by the officer in charge, and countersigned by the master.
If a port-state inspector later samples that entry, the test is whether it matches the Manual. The cycle count in the entry should match the Manual’s prewash procedure for acrylonitrile; the wash-water temperature should match; the sampling point should match. A clean match shows the crew operated in accordance with the Manual, which is exactly what Regulation 14 requires. A mismatch, even a benign one, opens the question of why the crew departed from the approved procedure, and that question is the start of a finding. The whole regime, from the IBC Code construction to the Chapter 17 category to the certificate to the Manual to the Cargo Record Book entry, exists to make that single discharge auditable after the fact.
Limitations and practitioner caveats
Regulation 14 makes the Manual mandatory and binding, but the regulation has edges a practitioner should hold in mind. The first is that approval delegation varies by flag. While most flag Administrations delegate Manual approval to recognized class societies, the delegation isn’t universal, and some Administrations retain approval or impose additional national requirements on top of the standard format. An operator should confirm the specific flag’s delegation arrangement rather than assuming the class society’s approval is the final word; the regulation vests approval in the Administration, and the Administration can reclaim or condition that approval.
The second is that the standard format is a floor, not a ceiling. MEPC.18(22) as revised sets the minimum content and the fixed numbering, but a flag Administration or a class society may require additional ship-specific sections, and a well-run operator may include operational detail beyond the standard minimum. A Manual that contains only the bare standard sections is compliant but may not be the most useful working document for a complex parcel tanker. The standard format defines what must be there, not the limit of what should be.
The third caveat is that the Manual is only as accurate as its last revision, and the revision discipline depends on the operator. The regulation requires reissue when the basis for approval changes, but it relies on the operator and the class society to recognize that a change has occurred and to act on it. A recoating that the technical department doesn’t flag to the class society, or a cargo addition processed against the certificate but not reflected in the Manual, leaves the ship with a Manual that no longer describes it. The most common failure isn’t a missing Manual; it’s a Manual that’s fallen out of step with the ship and the certificate, which is precisely what the port-state currency check is designed to catch.
The fourth is that “operate in accordance with the Manual” assumes the Manual describes a procedure that can actually be executed in the conditions the ship meets. When a reception facility is unavailable, a heater fails, or a cargo behaves outside the Manual’s assumptions, the approved procedure can’t be followed, and the lawful response is the recorded exception, not an improvised substitute. The Manual doesn’t anticipate every operational contingency, and the discipline that holds the regime together is the honest Cargo Record Book entry that records what was done and why when the approved procedure couldn’t be. The regulation governs the documented procedure; professional judgment, recorded and justified, governs the gaps.
See also
- MARPOL Convention
- MARPOL Annex II: Noxious Liquid Substances
- MARPOL Annex II Regulation 6: Categorization of NLS
- MARPOL Annex II Regulation 12: Pumping, Piping, Unloading
- MARPOL Annex II Regulation 13: Cargo Tank Washing
- MARPOL Annex II Regulation 15: Cargo Record Book
- MARPOL Annex II Regulation 11: Cargo Tank Arrangement
- MARPOL Annex II Regulation 16: Measures of Control by Port States
- MARPOL Annex II Regulation 17: SMPEP for NLS
- MARPOL Annex II Regulation 18: Reception Facilities
- IBC Code
- Chemical Tanker
- SIRE Tanker Inspections
- Calculator catalogue
References
- IMO, Resolution MEPC.118(52), Revised Annex II of MARPOL 73/78, adopted 15 October 2004, in force 1 January 2007.
- IMO, Resolution MEPC.18(22), Standard format for the Procedures and Arrangements Manual, adopted 1985.
- IMO, Resolution MEPC.119(52), Revised standard for the Procedures and Arrangements Manual, adopted 15 October 2004.
- IMO, Resolution MEPC.315(74), amendments to MARPOL Annex II on persistent floating products, adopted 17 May 2019, in force 1 January 2021.
- International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code), Chapter 17.
- Tokyo MoU and Paris MoU, port-state control inspection databases.