CSR renewal thresholds
The renewal number on a CSR ship is built, not read off a percentage. This table holds the whole chain: the corrosion addition grid, how t_c is assembled from it, the renewal thickness and the band above it, and which ships the rules catch. Every value carries its clause and its PDF page.
- table
- T10
- last verified
- 2026-08-04
- verified by
- —
- cycle
- each CSR edition, and each January
"Corrosion addition for one side of a structural member" — t_c1 or t_c2, in mm
These are one-side values. Two of them make a member — see the next dataset for how they are combined. Values in mm. 28 rows · every value carries its clause and PDF page
| Compartment · structural member | Oil tankersdouble hull, L_LL ≥ 150 m | BC-A / BC-Bbulk carriers with L_LL ≥ 150 m | Other BCall other bulk carriers |
|---|---|---|---|
| "Ballast water tank, bilge tank, drain storage tank, chain locker" · note (1)"Face plate of PSM" — inside the 3 m band under the tank top · note (4) | 2.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 2.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 2.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Ballast water tank, bilge tank, drain storage tank, chain locker" · note (1)"Face plate of PSM" — the "Elsewhere" row, below that band | 1.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Ballast water tank, bilge tank, drain storage tank, chain locker" · note (1)"Other members", notes (2) and (3) — inside the 3 m band under the tank top · note (4) | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Ballast water tank, bilge tank, drain storage tank, chain locker" · note (1)"Other members", notes (2) and (3) — the "Elsewhere" row, below that band | 1.2 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.2 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.2 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Cargo oil tank, slop tank""Face plate of PSM" — inside the 3 m band under the tank top · note (4) | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Cargo oil tank, slop tank""Face plate of PSM" — the "Elsewhere" row, below that band | 1.4 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Cargo oil tank, slop tank""Inner-bottom plating / bottom of tank" | 2.1 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Cargo oil tank, slop tank""Other members" — inside the 3 m band under the tank top · note (4) | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Cargo oil tank, slop tank""Other members" — the "Elsewhere" row, below that band | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Dry bulk cargo hold" · note (5)"Transverse bulkhead" — upper part · note (6) | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 2.4 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Dry bulk cargo hold" · note (5)"Transverse bulkhead" — lower stool: sloping plate, vertical plate and top plate · note (7) | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 5.2 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 2.6 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Dry bulk cargo hold" · note (5)"Transverse bulkhead" — other parts | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 3.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Dry bulk cargo hold" · note (5)"Sloped plating of hopper tank, inner bottom plating" | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 3.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 2.4 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Dry bulk cargo hold" · note (5)"Other members" — upper part · note (6), and the row "Webs and flanges of the upper end brackets of side frames of single side bulk carriers", which shares this value | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.8 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Dry bulk cargo hold" · note (5)"Other members" — the row "Webs and flanges of lower brackets of side frames of single side bulk carriers" | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 2.2 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.2 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Dry bulk cargo hold" · note (5)"Other members" — other parts | N/A Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 2.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.2 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Exposed to atmosphere""Weather deck plating" | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Exposed to atmosphere""Other members" | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 102 |
| "Exposed to seawater"The row "Shell plating between the minimum design ballast draught waterline and the scantling draught waterline" | 1.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 1.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 1.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 |
| "Exposed to seawater""Shell plating elsewhere" | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 1.0 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 |
| "Fuel and lube oil tank"The compartment type carries one value; the source names no member breakdown | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 |
| "Fresh water tank"The compartment type carries one value; the source names no member breakdown | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 |
| "Void spaces" · note (8)Spaces the crew does not routinely go into. The rule's own examples: a space reachable only through a bolted manhole, a pipe tunnel, and the inside face of a stool that does not border a dry bulk cargo hold or a ballast cargo hold. The list is open-ended. | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.7 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 |
| "Dry spaces"Structure inside the machinery space, the pump room, the store rooms and the steering gear space, among others. | 0.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 | 0.5 Pt 1 Ch 3 Sec 3 Table 1 · PDF p. 103 |
| Footnote addition (1) — chain lockerThe office adds this on the plate surface, in the 3 m band measured up from the upper face of the chain locker bottom | +1.0 Pt 1 Ch 3 Sec 3 Table 1, note (1) · PDF p. 103 | +1.0 Pt 1 Ch 3 Sec 3 Table 1, note (1) · PDF p. 103 | +1.0 Pt 1 Ch 3 Sec 3 Table 1, note (1) · PDF p. 103 |
| Footnote addition (2) — ballast / heated cargo oil boundary, plateGoes on the ballast-side face of a plate that divides a water ballast tank from a heated cargo oil tank or a heated slop tank. A tank counts as heated once it is fitted with any form of heating capability — coils are the usual case. | +0.5 Pt 1 Ch 3 Sec 3 Table 1, note (2) · PDF p. 103 | +0.5 Pt 1 Ch 3 Sec 3 Table 1, note (2) · PDF p. 103 | +0.5 Pt 1 Ch 3 Sec 3 Table 1, note (2) · PDF p. 103 |
| Footnote addition (2) — stiffener on a heated-oil boundaryGoes on both faces of the web and both faces of the face plate, for a stiffener that sits in a ballast tank and lands on such a boundary — whether the far side is a heated cargo oil tank, a heated fuel or lube oil tank, or a heated slop tank | +0.3 Pt 1 Ch 3 Sec 3 Table 1, note (2) · PDF p. 103 | +0.3 Pt 1 Ch 3 Sec 3 Table 1, note (2) · PDF p. 103 | +0.3 Pt 1 Ch 3 Sec 3 Table 1, note (2) · PDF p. 103 |
| Footnote addition (3) — ballast / heated fuel or lube oil boundaryGoes on the ballast-side face of a plate that divides a water ballast tank from a heated fuel oil or lube oil tank | +0.7 Pt 1 Ch 3 Sec 3 Table 1, note (3) · PDF p. 103 | +0.7 Pt 1 Ch 3 Sec 3 Table 1, note (3) · PDF p. 103 | +0.7 Pt 1 Ch 3 Sec 3 Table 1, note (3) · PDF p. 103 |
- (4)
- The band exists only where the weather deck forms the tank top, so it reaches cargo tanks, slop tanks and ballast tanks and no other compartment. Measure the 3 m straight down from the tank top, on a line running parallel to it. Pt 1 Ch 3 Sec 3 Table 1, note (4) · PDF p. 103
- (5)
- The category covers any hold built to carry dry bulk cargo, and the hold stays in the category even where it also takes water ballast. Pt 1 Ch 3 Sec 3 Table 1, note (5) · PDF p. 103
- (6)
- Where the hold has a topside tank, the upper part is everything above the line at which that topside meets the inner hull, or the side shell. Where there is no topside, the upper part is instead the top third of the hold height — and the rule carries a plane bulkhead in a dry bulk cargo hold inside that same sentence, so the upper part of such a bulkhead is set the same way, off the hold height and not off a topside connection. Pt 1 Ch 3 Sec 3 Table 1, note (6) · PDF p. 103
- (7)
- Some bulkheads carry no lower stool — the rule's own examples are the engine room bulkhead and the fore peak bulkhead — and a plane bulkhead has none either. In those cases the rule says the addition should carry up to the height of the stool on the bulkhead facing it across the hold; the source writes should, not shall. If the facing bulkhead has no stool either, run the zone from the inner bottom up to the level of the top of the hopper sloping plate beside it, and stop at 3 m even where that level sits higher. Pt 1 Ch 3 Sec 3 Table 1, note (7) · PDF p. 103
- (8)
- When the corrosion addition for outer shell plating is worked out, a pipe tunnel lying behind that plating is treated as though it were a water ballast tank. Pt 1 Ch 3 Sec 3 Table 1, note (8) · PDF p. 103
How t_c is built, and the offered thicknesses around it
One column. The corrosion addition is assembled from the one-side values above; the gross and net definitions come from the section before it. 22 rows · every value carries its clause and PDF page
| Compartment · structural member | Value or ruleCSR 1 Jan 2024 version |
|---|---|
| Reserve thickness t_resA flat figure, independent of member and of as-built thickness | 0.5 mm Pt 1 Ch 3 Sec 3, Symbols · PDF p. 101 |
| Total corrosion addition, member between two compartmentsEach side takes its own one-side value from Table 1 | t_c = Roundup_0.5 (t_c1 + t_c2) + t_res Pt 1 Ch 3 Sec 3 [1.2.1] · PDF p. 101 |
| Total corrosion addition, internal member within one compartmentt_c1 is the Table 1 value for one side exposure to that compartment | t_c = Roundup_0.5 (2 t_c1) + t_res Pt 1 Ch 3 Sec 3 [1.2.1] · PDF p. 101 |
| RoundingApplies to the sum of the one-side values, before the reserve is added | Roundup_0.5 (t) takes t up to the next half millimetre Pt 1 Ch 3 Sec 3 [1.2.1] · PDF p. 101 |
| Minimum total corrosion additionGeneral case | 2 mm Pt 1 Ch 3 Sec 3 [1.2.2] · PDF p. 102 |
| Minimum total corrosion addition, reduced caseStiffener webs and face plates, and structure sitting inside dry spaces | 1.5 mm Pt 1 Ch 3 Sec 3 [1.2.2] · PDF p. 102 |
| Stainless steel or aluminiumCompartment boundaries and internal members made from these materials carry the reserve alone. Stainless clad steel is handled separately, two rows down. | t_c = t_res = 0.5 mm Pt 1 Ch 3 Sec 3 [1.2.1] · PDF p. 101 |
| Minimum values, exceptionThe 2 mm and 1.5 mm minimums do not apply to these materials | Neither minimum bites on stainless steels, stainless clad steels or aluminium alloys Pt 1 Ch 3 Sec 3 [1.2.2] · PDF p. 102 |
| Stainless clad steel, carbon steel sideWhere the carbon steel face of a clad structure is left exposed, it is treated as ordinary steel | t_c1 is the Table 1 figure for whichever compartment that face looks into Pt 1 Ch 3 Sec 3 [1.1.1] and [1.2.1] · PDF p. 101 |
| Stainless clad steel, stainless side | t_c2 = 0 Pt 1 Ch 3 Sec 3 [1.2.1] · PDF p. 101 |
| Materials coveredCorrosion additions for other materials are set by the Society | Carbon-manganese steels, stainless steels, stainless clad steels, aluminium alloys Pt 1 Ch 3 Sec 3 [1.1.1] · PDF p. 101 |
| Stiffener, which value appliesNot where the web sits — where the stiffener lands | It follows where the stiffener lands on its attached plating, not where the web runs Pt 1 Ch 3 Sec 3 [1.2.3] · PDF p. 102 |
| One plate touched by more than one valueThe strake rule | The heaviest of the competing values governs the whole strake Pt 1 Ch 3 Sec 3 [1.2.4] · PDF p. 102 |
| Exception to the strake rule, oil tankersVertical corrugations arranged by vertical seams | Each part may keep its own figure — the addition for above the 3 m line on the part above it, the addition for below that line on the part below Pt 1 Ch 3 Sec 3 [1.2.4] · PDF p. 102 |
| Gross required thicknesst_req is the net required thickness | t_gr_req = t_req + t_c Pt 1 Ch 3 Sec 2 [1.2.1] · PDF p. 98 |
| Gross offered thicknessWhat the yard actually fitted, less any voluntary extra | t_gr_off = t_as_built − t_vol_add Pt 1 Ch 3 Sec 2 [1.2.2] · PDF p. 98 |
| Net offered thickness | t_off = t_gr_off − t_c = t_as_built − t_vol_add − t_c Pt 1 Ch 3 Sec 2 [1.2.3] · PDF p. 98 |
| Voluntary addition t_vol_addSteel the owner or the yard put on over and above t_c, as their own cushion against wastage | It is stripped out before the scantlings are checked — the Rule compliance check never sees it Pt 1 Ch 3 Sec 2, Symbols · PDF p. 97, and [1.3.2] · PDF p. 99 |
| As-built thickness t_as_built | The thickness the yard actually fitted Pt 1 Ch 3 Sec 2, Symbols · PDF p. 97 |
| Net required thickness, rounding | t_req is the Rule net thickness taken to the closer half millimetre — up or down, unlike t_c, which only ever goes up Pt 1 Ch 3 Sec 2 [1.3.1] · PDF p. 99 |
| Why net and gross are kept apartThe source states the purpose; it names no coating credit either way | t_c is set on its own, with no reference to what the strength calculation happens to need, so at any point in the ship's life the wastage can be read straight off against a fixed reference Pt 1 Ch 3 Sec 2 [1.1.1] · PDF pp. 97–98 |
| Items outside the net scantling approachGross scantlings, identified by the suffix "gr" | Superstructures and deckhouses, scantled per Ch 11 Sec 1; and massive pieces, meaning steel forgings and steel castings Pt 1 Ch 3 Sec 2 [1.1.3] · PDF p. 98 |
Renewal criteria: local corrosion, the band, and the hull girder
Local and global are both acceptance criteria. Steel renewal follows if either is exceeded. 17 rows · every value carries its clause and PDF page
| Compartment · structural member | CriterionCSR 1 Jan 2024 version |
|---|---|
| Renewal thicknessThe number a measured thickness is compared against | t_ren = t_as-built − t_c − t_vol_add Pt 1 Ch 13 Sec 2 [2.1.1] · PDF p. 722 |
| Renewal triggert_m is the measured thickness in mm | The plate has to come out once t_m falls below t_ren Pt 1 Ch 13 Sec 2 [2.1.1] · PDF p. 722 |
| Which members the criterion covers | Both local supporting members and primary supporting members count as local structural elements here Pt 1 Ch 13 Sec 2 [2.1.1] · PDF p. 722 |
| Thickness of the insert on a renewed areaThe insert does not go back at the renewal thickness | t_repair = t_as-built − t_vol_add, and not less than that Pt 1 Ch 13 Sec 2 [2.1.2] · PDF p. 723 |
| Material of the insert | The insert has to match the grade and yield stress of what came out, or beat it Pt 1 Ch 13 Sec 2 [2.1.2] · PDF p. 723 |
| The band above t_renFixed width, whatever the member and whatever the as-built thickness | t_ren ≤ t_m < t_ren + t_res Pt 1 Ch 13 Sec 2 [2.1.3] · PDF p. 723 |
| Width of the bandt_res as defined in the section symbols | 0.5 mm Pt 1 Ch 13 Sec 2, Symbols · PDF p. 721 |
| What the band triggersIt is not a renewal, and it is not a clean reading | Inside this band nothing is renewed automatically: the Society may take an alternative solution instead, under its own rules and documents carrying IACS UR Z10.2, Z10.4 and Z10.5 Pt 1 Ch 13 Sec 2 [2.1.3] · PDF p. 723 |
| Local and global corrosion, definitionsBoth have to be satisfied | Local corrosion is the even wasting of one element — a single plate, a single stiffener. Global corrosion is what a bigger region has lost on average: a primary supporting member, or the hull girder taken whole Pt 1 Ch 3 Sec 2 [1.1.2] · PDF p. 98 |
| Global check, when it runsUses thicknesses measured, renewed and reinforced as appropriate | The hull girder is re-checked at each special survey once the ship is past 10 years old Pt 1 Ch 13 Sec 2 [2.2.1] · PDF p. 723 |
| Deck and bottom zones — section modulusNot to be less than, so at or above the figure | Work the current section modulus at deck and at bottom out of the measured thicknesses. Neither may drop under 90% of the same modulus figured per Ch 5 Sec 1 on the gross offered thickness Pt 1 Ch 13 Sec 2 [2.2.2] a) · PDF p. 723 |
| Deck and bottom zones — area alternativeOffered as an alternative to the modulus check | Or work it by area: add up the measured item areas in the bottom zone, then in the deck zone. Neither total may drop under 90% of that same zone worked on the gross offered thickness Pt 1 Ch 13 Sec 2 [2.2.2] a) · PDF p. 723 |
| Neutral axis zoneExpressed as an absolute deduction, not a percentage | Add up the measured plating areas in the neutral axis zone. The total may not drop under that zone worked on the gross offered thickness less 0.5 t_c Pt 1 Ch 13 Sec 2 [2.2.2] b) · PDF p. 723 |
| Screening rulePasses the section without running the zone-area calculations | A section can pass without any zone-area arithmetic. Take every item in it that carries hull girder strength: where each has lost under 10% of its gross offered thickness for the deck and bottom zones, and under 0.5 t_c for the neutral axis zone, the section is through and the zone areas need never be worked from the measurements Pt 1 Ch 13 Sec 2 [2.2.2] · PDF p. 723 |
| Which items belong to which zoneSide shell plating is not in every list — see the note | The deck zone and the bottom zone each get their own list for bulk carriers and a second for oil tankers; the neutral axis zone runs a single list covering both ship types the two deck lists are qualified with "such as" and the neutral axis list with "as for example", so an item not named still belongs to the zone if it carries hull girder strength; the bottom zone lists carry no such qualifier and read as the items the zone holds. Side shell plating sits in the deck list for bulk carriers but not for oil tankers, whose deck list names the sheer strake and the uppermost strake of the inner hull and plane longitudinal bulkheads and stops there — both deck lists name the sheer strake, so that is not what separates them. Side shell plating is in the bottom zone and the neutral axis zone for both ship types. Pt 1 Ch 13 Sec 2 [1.2.1] to [1.2.3] · PDF pp. 721–722 |
| Inclined longitudinal members | Where a longitudinal member that forms part of the hull girder web is set at an angle, only its projection onto the vertical plane counts towards the zone area Pt 1 Ch 13 Sec 2 [1.2.3] · PDF p. 722 |
| Gross offered thickness for the global check | As defined in Ch 3 Sec 2, that is t_as_built − t_vol_add Pt 1 Ch 13 Sec 2 [2.2.2] · PDF p. 723, with Ch 3 Sec 2 [1.2.2] · PDF p. 98 |
Which ships are CSR ships
The three conditions of [1.1.1] apply together, then the size limit for the ship type. If a ship is not a CSR ship, nothing in this table applies to it. 17 rows · every value carries its clause and PDF page
| Compartment · structural member | RequirementCSR 1 Jan 2024 version |
|---|---|
| Ship typesCondition a) | Bulk carriers and double hull oil tankers Pt 1 Ch 1 Sec 1 [1.1.1] a) · PDF p. 21 |
| Propulsion and serviceCondition b) | Self-propelled ships with unrestricted navigation Pt 1 Ch 1 Sec 1 [1.1.1] b) · PDF p. 21 |
| Contract dateCondition c) — the contract date decides, not the keel date and not the delivery date | Contracted for construction on or after 1 July 2015 Pt 1 Ch 1 Sec 1 [1.1.1] c) · PDF p. 21 |
| Unrestricted navigation, definitionNote 1 to [1.1.1] | No geographical restriction is placed on the ship: any ocean, any season. The one limit the rule allows is whatever the ship's own ice capability imposes Pt 1 Ch 1 Sec 1 [1.1.1] Note 1 · PDF p. 21 |
| Contracted for construction, definitionNote 2 to [1.1.1] | The day the intending owner and the yard sign the shipbuilding contract. IACS Procedural Requirement PR No. 29 carries the detail for the awkward cases Pt 1 Ch 1 Sec 1 [1.1.1] Note 2 · PDF p. 21 |
| Bulk carrier size limitSingle side skin and double side skin alike | Freeboard length L_LL of 90 m or above Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 21 |
| Bulk carrier, definition used | A ship of the general build — one deck, a double bottom, hopper side tanks and topside tanks, single or double side skin through the cargo hold region — meant first of all for dry cargo carried in bulk Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 21 |
| Hybrid bulk carriersAt least one hold with hopper and topside tanks, other holds without | They still have to meet the strength criteria these Rules set Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 21 |
| Oil tanker size limit | Double hull oil tankers of freeboard length L_LL of 150 m or above Pt 1 Ch 1 Sec 1 [1.3.1] · PDF p. 22 |
| Oil tanker, definition used | Any ship that falls under Annex I of MARPOL 73/78 Pt 1 Ch 1 Sec 1 [1.3.1] · PDF p. 22 |
| Structural arrangement assumed | Welded steel, built up from stiffened plate panels; framing either longitudinal or transverse, with full transverse bulkheads and web frames between them; a double bottom of the statutory depth; the engine room abaft the cargo tank or hold region Pt 1 Ch 1 Sec 1 [1.1.2] · PDF p. 21 |
| Excluded ship type — ore carriersExcluded even where the length is met | Rules not applicable Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 22 |
| Excluded ship type — combination carriers | Rules not applicable Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 22 |
| Excluded ship type — woodchip carriers | Rules not applicable Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 22 |
| Excluded ship type — cement, fly ash and sugar carriersThe exclusion carries a condition on how the ship is worked | Out, so long as the ship is not worked with grabs over 10 tons, with power shovels, or with anything else able to damage the cargo hold structure Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 22 |
| Excluded ship type — self-unloaders | Out where the inner bottom is built for self-unloading — Rules not applicable Pt 1 Ch 1 Sec 1 [1.2.1] · PDF p. 22 |
| Ships outside the Rules | They fall back on the Society's own rules Pt 1 Ch 1 Sec 1 [1.1.3] · PDF p. 21 |
Edition read. Every value in this table was read from the IACS CSR for Bulk Carriers and Oil Tankers, 1 January 2024 version, which entered into force on 1 July 2024. Registry id iacs-csr-2024. The edition in force is the Consolidated 1 July 2025 edition — the same text with Corrigenda 1 applied. Those corrigenda are not held, so no value here is presented as coming from the consolidated edition; cite each figure as "CSR 1 Jan 2024 version" with its clause. PDF page = printed page + 6 in the file held. One cross-reference in the source is loose: the symbols list of Pt 1 Ch 13 Sec 2 (PDF p. 721) defines t_c as "Corrosion addition in mm, as defined in Ch 3, Sec 2", while the corrosion additions and Table 1 sit in Ch 3 Sec 3. The values in this table are taken from Ch 3 Sec 3. What CSR does not cover. The renewal chapter is two sections only, titled Principles and Survey Requirements and Acceptance Criteria, and the acceptance criteria are local corrosion against t_ren and global corrosion against the hull girder percentages. CSR carries no "substantial corrosion" term and no acceptance criteria for pitting, edge corrosion or grooving. Those sit in the IACS UR Z10 series, and CSR points to them: it hands the survey requirements back to each Society's own rules, which carry Z10.2 for single side skin bulk carriers, Z10.4 for double hull oil tankers and Z10.5 for double side skin bulk carriers. On a CSR ship both apply at once — CSR supplies the strength arithmetic, Z10 supplies the survey.