Chapter 2 Survey Requirements of Steel Ship
2.7 Special Surveys
2.6.7 Intermediate survey – liquefied gas carrier See 2.10.2.
2.6.8 Intermediate survey – chemical carrier See 2.11.2.
2.6.9 Intermediate survey – general dry cargo ships See 2.12.2.
2.6.10 Intermediate survey – double hull oil tankers See 2.13.2.
2.6.11 Intermediate survey – passenger ships See 2.14.2.
2.6.12 Intermediate survey – double skin bulk carriers See 2.15.2.
2.6.13 Barges - hull
In addition to the applicable requirements of 2.6.1, the intermediate survey is also to include the following:
(a) Salt water ballast spaces
In lieu of 2.6.1, an overall survey of three representative salt water ballast spaces including one rake tank and one upper wing tank, if applicable, and one additional space selected by the Surveyor.
(b) Deck cargo barges
At each intermediate survey after special survey No.3 – hull, in addition to the required salt water ballast spaces, at least two void spaces are to be examined internally, as considered necessary by the attending Surveyor.
(c) Dry cargo barges
At each intermediate survey after special survey No.3 – hull, in addition to the required salt water ballast spaces, at least two cargo holds are to be examined and dealt with, as deemed necessary by the attending Surveyor. Where extensive corrosion or structural damage is found, the remaining holds may also be required to be examined and dealt with.
(d) Oil/fuel oil tank barges and chemical tank barges - hull
At each intermediate survey after special survey No.2 – hull, in addition to the required salt water ballast spaces, at least three cargo tanks: one center tank, one port wing tank and one starboard wing tank, are to be examined internally and dealt with, as deemed necessary by the attending Surveyor. Thickness gauging and means of access to the upper part of the tanks may be required. Where extensive corrosion or structural damage is found, the remainder of the cargo tanks may be required to be examined.
2.6.14 Fishing ships - hull
In addition to the applicable requirements of 2.6.1, at each intermediate survey after special survey No.3 – Hull, an overall survey of at least two of the fish holds.
2.7 Special Surveys
2.7.1 Special survey No.1 - hull
All annual survey requirements together with the following are to be complied with:
2.7 Special Surveys
(a) The examinations of the hull are to be supplemented by thickness measurements and testing as deemed necessary, to ensure that the structural integrity remains effective and are to be sufficient to discover Substantial Corrosion, significant deformation, fractures, damages or other structural deterioration. The close ceiling in holds of single bottom ships is to be lifted to such an extent that at least two strakes on each side (one strake being at the bilge) and all portable hatches in holds and flooring plates in machinery and boiler spaces are to be removed for examination of the structure below. Where a double bottom is fitted, a sufficient ceiling is to be lifted from the inner bottom to enable the Surveyors to satisfy themselves as to the condition of the tank top plating, and if necessary, all ceiling is to be removed for ascertaining the condition. The cement or other composition on the inner space of the bottom plating is to be carefully examined. The removal of this covering may be dispensed with provided that it is tested by beating or chipping, and found sound and adhering satisfactorily to the steel plating.
(b) Internal examinations of spaces and tanks
(i) At special surveys, paying due attention to (1) through (8) below, examinations of structures and fittings such as piping, etc. in tanks and spaces are to be carried out carefully.
(1) Structural members, piping, hatch covers, etc. sensitive to corrosion in the cargo holds where high-corrosive cargoes to steel such as logs, salt, coal, sulfide ore, etc. have been lo aded.
(2) Portions sensitive to wearing down by heat such as plating under boilers.
(3) Structurally discontinuous portions such as corners of hatchway openings on deck, openings including side scuttles, cargo port, etc. on shell.
(4) Condition of coating and corrosion prevention system if applied.
(5) Condition of striking plates under sounding pipes.
(6) Condition of cement or deck composition, if fitted.
(7) Locations on which defects such as cracking, buckling, corrosion, etc. have been found in similar ships or similar structures.
(8) Critical structural areas which may effect the strength and structural are to be examined.
(ii) At special surveys, paying attention to (i) above, internal examinations of tanks or spaces listed in Table I 2-1A are to be carried out. In case where postponement of the special survey, a kind of the special survey to be applied to the ship is to be determined based on the original expiry date of the Certificate of Classification of the ship.
(iii) At special surveys for tankers, in addition to (i) and (ii) above, an internal examination of tanks and spaces listed in Table I 2-1B is to be carried out.
(iv) At special surveys for bulk carriers, in addition to (i) and (ii) above, an internal examination of tanks and spaces listed in Table I 2-1C is to be carried out.
(c) Pressure Test
(i) At special surveys, a pressure test of tanks is to be carried out according to (1) through (3) below.
(1) A pressure test is to be carried out under the pressure as specified below:
– For tanks: the pressure corresponding to the maximum head that can be experienced in service.
– For piping: the working pressure.
(2) A pressure test of tanks may be carried out when the ship is afloat, provided that an internal examination of bottom of the tank is also carried out afloat.
(3) At special surveys for ships having many water tanks and oil tanks, some water tanks or oil tanks may be exempted from a pressure test where deemed appropriate by the Surveyor taking account of present ship's condition, ship's age and an interval from the previous testing.
(ii) At special surveys for cargo ships, a pressure test is to be carried out according to (i) above for tanks listed in Table I 2-2A (Requirements of Pressure Tests at Special Survey for Cargo Ships) and Table I 2-2B (Minimum Requirements of Pressure Test at Special Survey of Oil Tankers, Ore/Oil Carriers and etc.), and Table I 2-2C (Requirements of Pressure Tests at Special Survey of Bulk Carriers).
2.7 Special Surveys
(d) Decks, casings and superstructures are to be examined, especially the corners of openings and other discontinuities in way of strength decks and top sides. Wood decks or sheathings are to be examined and sections to be removed to ascertain the condition of the plating if found not adhering closely to the platin g.
(e) The requirements for thickness measurement are given in Table I 2-3A and the structural members in any locations proved to be rapidly wasted or showing excessive corrosion are to be measured in accordance with the requirements of Table I 2-4A which is to be carried out by an appropriate ultrasonic equipment or other approved means.
(f) The equipment required by the Rules is to be verified. The anchors and chain cables are to be ranged, examined and the required complement and condition verified. The chain locker holdfasts, hawse pipes and chain stoppers are to be examined and pumping arrangements of the chain locker tested.
(g) All bilge and ballast piping systems are to be examined and operationally tested to working pressure to attending Surveyor's satisfaction to ensure that tightness and condition remain satisfactory.
(h) When spaces are insulated in connection with refrigeration, hatches and limbers are to be removed and the condition of the structural members examined.
(i) Hatch covers and coamings are to be examined as follows:
(i) A thorough inspection of the items listed in 2.5.1(b) is to be carried out.
(ii) Random checking of the satisfactory operation of mechanically operated hatch covers is to be made, including:
(1) Storage and securing in open condition;
(2) Proper fit and efficiency of sealing in closed condition;
(3) Operational testing of hydraulic and power components, wires, chains, and link drives;
(iii) The effectiveness of sealing arrangements of all hatch covers by hose testing or equivalent is to be checked.
(j) Engine room structure is to be examined. Particular attention is to be given to tank tops, shell plating in way of tank tops, brackets connecting side shell frames and tank tops, and engine room bulkheads in way of tank top and bilge wells. Where wastage is evident or suspect, thickness measurements are to be carried out, and renewals or repairs made when wastage exceeds allowable limits.
(k) A bottom survey in dry dock in accordance with the requirements of 2.2.1 of this P art is to be carried out as part of the special survey.
(l) For all ships except for passenger ships, automatic air pipe heads are to be completely examined (both externally and internally) as indicated in Table I 2-28. For designs where the inner parts cannot be properly inspected from outside, this is to include removal of the head from the air pipe. Particular attention is to be paid to the condition of the zinc coating in heads constructed from galvanized steel.
(m) Survey planning
Survey planning is to be carried out for ESP ships in accordance with 2.1.5(a).
(n) Gangways, accommodation ladders with accessory wires, winches and gears are to be load tested and operationally tested with maximum operational load.
(o) Bow doors, inner doors, side shell doors and stern doors are to be surveyed as per IACS UR Z24 "3.
Special Survey."
2.7.2 Special survey No.2 hull
All items specified in 2.7.1 together with the following are to be complied with:
2.7 Special Surveys
(a) A sufficient amount of ceiling in the holds is to be lifted from bilges and satisfy themselves as to the condition of the structure in bilge, the inner bottom plating, the pillar feet, the lower end plating of bulkheads and the tunnel side. In ships having a single bottom, the close ceiling in holds is to be lifted to such an extent that at least 3 strakes on each side (one strake being at the bilge) and all portable hatches in holds and flooring plates in machinery and boiler spaces are to be removed for examination of the structure below. But in either case the whole of the ceiling may be lifted for examination of the structure below when considered necessary by the Surveyor.
(b) The requirements with regard to internal examination, thickness measurement and tank pressure testing same as those stated in 2.7.1(b), (c) and (e) are to be complied with.
(c) Chain cables are to be ranged out and examined, and chain lockers examined internally. When any length of a chain cable is so worn that its mean diameter is 12% below the requirement, it is to be renewed.
2.7.3 Special survey No.3 hull
All items specified in 2.7.2 together with the following are to be complied with:
(a) A sufficient amount of ceiling and lining in the holds and flooring plates in the machinery spaces are to be removed as required by the Surveyor. The ship is to be made free from rust inside and outside in order to expose for examination of the framing and plating together with discharges, scuppers, air and sounding pipes, and the structure is to be examined.
(b) Wood sheathing and deck composition on steel decks are to be removed as required by the Surveyor and plating below examined. Cement chocks on the ship's sides at bilges and decks are to be examined, and portions of them removed so that the condition of the shell plating and adjacent steel work can be ascertained.
(c) The lining in way of side scuttles is to be removed as required by the Surveyor, and the shell plating examined.
(d) The requirements with regard to internal examination, thickness measurement and tank pressure testing same as those stated in 2.7.1(b), (c) and (e) are to be complied with.
2.7.4 Special survey No.4 and subsequent hull
In addition to all items specified in 2.7.3 the requirements with regard to internal examination, thickness measurement and tank pressure testing same as those stated in 2.7.1(b), (c) and (e) are to be complied with.
2.7.5 Special survey additional ESP hull requirements for oil tankers (combination carrier included)/bulk carrier (a) General
(i) All cargo tanks/holds, ballast tanks, pump rooms (for tankers), pipe tunnels, cofferdams and void spaces bounding cargo tanks/holds, decks and outer hull are to be examined, and this examination is to be supplemented by thickness measurement and testing as deemed necessary, to ensure that the structural integrity remains effective. The examination is to be sufficient to discover Substantial Corrosion, significant deformation, fractures, damages or other structural deterioration.
(ii) For both bulk carriers and oil tankers, all piping systems on weather deck and in the above tanks and spaces and only for oil tankers, cargo piping on deck, including crude oil washing (COW) piping, are to be examined and operationally tested under working pressure to attending Surveyor 's satisfaction to ensure that tightness and condition remain satisfactory. When considered necessary by the Surveyor pressure tests and gauging for pipings are to be carried out and results of the gauging are to be reported. For oil tanker, special attention is to be given to any ballast piping in cargo tanks and any cargo piping in ballast tanks and void spaces, and Surveyors are to be advised on all occasions when this piping, including valves and fittings are open during repair periods and can be examined internally.
(iii) The survey extent of combined ballast/cargo oil tanks or combined ballast cargo holds is to be evaluated based on the records of ballast history and the condition of the corrosion prevention system provided and extent of corrosion found.
2.7 Special Surveys
(iv) The survey extent of ballast tanks converted to void spaces is to be specially considered in relation to the requirements for ballast tanks.
(b) Tank corrosion prevention system
Where provided, the condition of coating or corrosion prevention system of ballast tanks and cargo tanks is to be examined. For salt water ballast tanks, excluding double bottom tanks of bulk carriers, where a protective coating is found in Poor condition and it is not renewed, where soft or semi-hard coating has been applied or where a protective coating was not applied from the time of construction, the tanks in question are to be examined at annual intervals. Thickness measurement is to be carried out as considered necessary.
When such breakdown of coating is found in salt water ballast double bottom tanks and it is no t renewed, where a soft or semi-hard coating has been applied, or where a coating was not applied from the time of construction the tanks in question are to be examined at annual intervals. Thickness measurement is to be carried out as deemed necessary by the Surveyor.
(c) Extent of overall and close-up surveys
(i) An overall survey of all tanks and spaces except fresh water, fuel oil, diesel oil and lubricating oil tanks is to be carried out. Fresh water, fuel oil, diesel oil and lubricating oil tanks are to be dealt with according to the requirements of
Table I 2-1A (Minimum Requirements for Internal Examination at Hull Special Surveys), Table I 2-1B (Additional Requirements of Internal Examinations for Oil Tankers), and Table I 2-1C (Additional Requirements of Internal Examinations for Bulk Carrier).
(ii) For the purpose of establishing the condition of internal members in cargo tanks/holds and ballast tanks, the requirements for the close-up survey are given in
Table I 2-5A (Minimum Requirements for Close-up Surveys at Hull Special Survey of Oil Tankers, Ore/Oil Carriers and etc.) and
Table I 2-5B (Minimum Requirements for Close-up Surveys at Hull Special Survey of Bulk Carriers).
(iii) For oil tankers, the Surveyor may extend the close-up survey as deemed necessary taking into account the maintenance of the tanks under survey, the condition of the corrosion prevention system and also in the following cases:
(1) in particular, tanks having structural arrangements or details which have suffered defects in similar tanks or on similar ships according to an available information;
(2) in tanks which have structures with reduced scantlings in association with a corrosion prevention system approved by the Society.
(iv) For areas in spaces where coatings are found to be in a Good condition, the extent of close-up surveys according to Table I 2-5A and Table I 2-5B may be specially considered by the Surveyor.
(d) Extent of thickness measurement
(i) The requirements for thickness measurements are given in Table I 2-3B (Minimum Requirements for Thickness Measurements at Hull Special Survey of Oil Tankers, Ore/Oil Carriers and etc. ), and Table I 2-3C (Minimum Requirement for Thickness Measurement at Hull Special Surveys of Bulk Carriers).
(ii) For bulk carriers, representative thickness measurement to determine both general and local levels of corrosion in the shell frames and their end attachments in all cargo holds and ballast tanks is to be carried out. Thickness measurement is also to be carried out to determine the corrosion levels on the transverse bulkhead plating. The thickness measurement may be dispensed with provided the Surveyor is satisfied with the close-up examination, that there is no structural diminution, and the protection coating where applied remains efficient.
(iii) The Surveyor may extend the thickness measurement as deemed necessary. Where Substantial Corrosion is found, the extent of thickness measurements is to be increased in acco rdance with the requirements of
Table I 2-4B (Requirements for Extent of Thickness Measurement in way of Substantial Corrosion at Hull Special Survey of Oil Tankers, Ore/Oil Carriers and etc. within the Cargo Tank Length) and Table I 2-4C (Requirements for Extent of Thickness Measurement in way of Substantial Corrosion at
2.7 Special Surveys
Hull Special Survey of Bulk Carriers within the Cargo Area.), and may be additionally specified in planning document as described in 2.1.5(a).
(iv) For areas in spaces where coatings are found to be in a Good condition, the extent of thickness measurements according to Table I 2-3B and I 2-3C may be specially considered by the Surveyor.
(v) Transverse sections are to be chosen where the largest reductions are suspected to occur or are revealed from deck plating measurements.
(vi) For oil tankers,
(1) Transverse sections are to be chosen such that thickness measurements can be taken for as many different tanks in corrosive environments as possible, e.g. ballast tanks sharing a common plane boundary with cargo tanks fitted with heating coils, other bal last tanks, cargo tanks permitted to be filled with sea water and other cargo tanks, and are to be clear of areas which have been locally renewed or reinforced;
(2) In cases where two or three sections are to be measured, at least one includes a ballast ta nk within 0.5L amidships;
(3) However, ballast tanks sharing a common plane boundary with cargo tanks fitted with heating coils and cargo tanks permitted to be filled with sea water are to be selected where present;
(4) The thickness of each component is to be determined by averaging all of the measurements taken in way of the transverse section on each component;
(5) Where one or more of the transverse sections are found to be deficient in respect of the longitudinal strength, the number of transverse sections for thickness measurement is to be increased such that each tank within the 0.5L amidships region has been sampled. Tank spaces that are partially within, but extend beyond the 0.5L region, are to be sampled; and
(6) Additional thickness measurements are also to be performed on one transverse section forward and one aft of each repaired area.
(e) Extent of tank pressure testing
(i) The requirements for tank pressure testing are given in Table I 2-2B.
Cargo tank testing of oil tankers carried out by the vessel's crew under the direction of the Master may be accepted by the surveyor provided the following conditions are complied with:
(1) A tank testing procedure has been submitted by the owner and reviewed by this Society prior to the testing being carried out;
(2) There is no record of leakage, distortion or substantial corrosion that would affect the structural
(2) There is no record of leakage, distortion or substantial corrosion that would affect the structural