Introducción

5.1 General

5.1.1 The different types of periodical surveys are summa-rised in Tab 1.

5.2 Annual surveys

In the five-year period of class, five annual surveys are to be carried out. The first to fourth annual surveys have a six-month window, i.e. from three six-months before to three months after each anniversary date, while the fifth annual survey has only a three-month window, i.e. from three months before to the fifth anniversary date.

5.3 Intermediate surveys

5.3.1 An intermediate survey, where applicable, is to be carried out within the window from three months before the second to three months after the third anniversary date.

5.3.2 The intermediate survey is applicable at any period of class to ships with the service notations oil tanker, chem-ical tanker, FLS tanker, liquefied gas carrier, combination carrier/OBO and combination carrier/OOC.

5.3.3 The intermediate survey is applicable at any period of class to ships other than those indicated in [5.3.2] which are five years old and over.

5.3.4 (1/7/2002)

The internal examination of ballast spaces, overall and/or close-up survey of ballast spaces and cargo holds or tanks, as applicable, carried out at the 2^nd or 3^rd annual survey are also credited towards the intermediate survey.

5.3.5 (1/1/2009)

Concurrent crediting to both intermediate survey and class renewal survey for surveys and thickness measurements of spaces is not acceptable.

5.4 Bottom survey

5.4.1 Bottom survey means the examination of the outside of the ship’s bottom and related items. This examination may be carried out with the ship either in dry dock (or on a slipway) or afloat: in the former case the survey will be referred to as dry-docking survey, while in the latter case as in-water survey.

5.4.2 The Owner is to notify the Society whenever the out-side of the ship’s bottom and related items can be exam-ined in dry dock or on a slipway.

5.4.3 (1/7/2005)

There is to be a minimum of two examinations of the out-side of the ship’s bottom and related items during each five-year class renewal survey period. One such examination is to be carried out in conjunction with the class renewal sur-vey. In all cases the interval between any two such exami-nations is not to exceed 36 months. An extension of examination of the ship's bottom of three months beyond the due date may be granted in exceptional circumstances (see [2.1.7]).

Note 1: Attention is drawn to the relevant requirements of Ch 1, Sec 1, [3.1], concerning application of national and international regulations.

5.4.4 (1/1/2012)

Examinations of the outside of ship’s bottom and related items of ships are normally to be carried out with the ship in drydock. However, consideration may be given to alternate examination while the ship is afloat as an In-water Survey, subject to the provisions of Ch 3, Sec 6, [3]. Special consid-eration is to be given to ships of 15 years or over before being permitted to have such examinations. For ships with ESP notation of 15 years of age and over, such examinations are to be carried out with the ship in drydock.

5.4.5 (1/7/2001)

The interval between examinations of the outside of the ship's bottom and related items for ships operating in fresh water and for certain harbour or non-self-propelled craft may be greater than that given above, as approved by the Society.

For ships of unusual characteristics or engaged on special services, means of underwater inspection equivalent to the bottom survey in dry condition may be considered as an alternative by the Society, particularly when a suitable high resistance paint is applied to the underwater portion of the hull or an approved system of impressed current for external cathodic protection is fitted.

5.4.6 (1/7/2003)

For ships with the ESP notation and those ships subject to the requirements of Ch 4, Sec 8, a bottom survey in dry condition is to be part of the class renewal survey.

5.4.7 (1/7/2003)

Compliance with the requirements of [5.4] and Ch 3, Sec 6 does not absolve the Owner from compliance with the requirements of SOLAS as amended, especially when shorter intervals between examinations of the ship's bottom are required for certain types of ships.

5.5 Tailshaft survey

Tailshaft survey means survey of propeller shafts and tube shafts (hereafter referred to as tailshafts) as well as survey of other propulsion systems.

5.5.2 Tailshaft complete survey(1/7/2007)

Unless alternative means are provided to ensure their con-dition, tailshafts are to be sufficiently drawn to permit full examination at the periodicity specified below and summa-rised in Fig 2, based on the type of shaft and its design, but with a maximum interval between successive examinations not exceeding the periodicity according to items a), b) and c) below by more than six months. Consideration may be given at the discretion of the Society to any special circum-stances justifying an extension of these intervals.

a) Where the tailshaft is fitted with continuous liners, or approved oil sealing glands, or made of corrosion-resist-ant material, the periodicity of complete surveys is:

1) 3 years for single shafting arrangements, 2) 4 years for multi-shafting arrangements;

b) these periodicities may be increased to 5 years in the following cases:

1) where the propeller is fitted keyless to the shaft taper, the shaft is protected from sea water, the design details are approved, and a non-destructive examination of the forward part of the aft shaft taper is performed at each survey by an approved crack-detection method,

2) where the propeller is fitted to a keyed shaft taper the design details of which comply with the applica-ble requirements in Pt C, Ch 1, Sec 7, and a non-destructive examination of the after end of the cylin-drical part of the shaft (from the after end of the liner, if any), and of about one third of the length of the taper from the large end is performed at each survey by an approved crack-detection method,

3) where the propeller is fitted to a solid flange cou-pling at the aft end of the shaft, the shaft and its fit-tings are not exposed to corrosion and the design details are approved. Non-destructive examination of the fillet radius of the aft propeller shaft flange may be required if the visual examination of the area is not satisfactory;

c) in all other cases the periodicity of complete surveys is two years and six months (2,5 years).

5.5.3 Tailshaft modified survey

A modified survey of the tailshaft is an alternate way of examination whose scope is given in Ch 3, Sec 7. It may be accepted at alternate five-yearly surveys for tailshafts described in [5.5.2] provided that:

• they are fitted with oil lubricated bearings and approved oil sealing glands

• the shaft and its fittings are not exposed to corrosion

• the design details are approved

• the clearances of the aft bearing are found to be in order

• the oil and the oil sealing arrangements prove effective

• lubricating oil analyses are carried out regularly at inter-vals not exceeding six months and oil consumption is recorded at the same intervals.

Figure 2 : Periodicity of complete survey of tailshaft

(a) : with shaft withdrawn, subject to modified survey at 5 years (b) : with shaft in place, subject to modified survey at 5 years Note 1 :

Shafts protected against corrosion are those:

• made of corrosion resistant material, or

• fitted with continuous liners or systems considered as equivalent, or

• fitted with oil lubricated bearings and oil sealing glands.

Note 2 :

Suitable sealing glands are glands which are type approved by the Society with regard to protection of the sterntube against ingress of water.

5.5.4 Tailshaft Monitoring System (MON-SHAFT) Where, in addition to the conditions stated in [5.5.3] for modified survey, the additional class notation MON-SHAFT is assigned, the tailshaft need not be withdrawn at both the complete and modified survey provided that all condition monitoring data is found to be within permissible limits and the remaining requirements for the respective surveys are complied with.

5.5.5 Other propulsion systems

Driving components serving the same purpose as the tailshaft in other propulsion systems, such as directional propellers, vertical axis propellers, water jet units, dynamic positioning systems and thruster assisted mooring systems,

are to be submitted to periodical surveys at intervals not exceeding five years.

5.6 Boiler survey

Water tube boilers used for main propulsion, including reheat boilers, all other boilers for essential service, and boilers for non-essential service having working pressure exceeding 0,35 N/mm² and a heating surface exceeding 4,5 m², are to be surveyed internally. There is to be a minimum of two internal examinations during each 5-year class renewal survey period. In all cases the interval between any two such examinations is not to exceed 36 months.

Shaft protected against corrosion (see Note 1)

YES

connection of propeller with - keyway of an approved design - solid flange coupling, or - fitted keyless to shaft taper

YES

shaft fitted with oil lubricated bearings and suitable sealing gland (see Note 2 )

oil analysis and oil consumption recorded at intervals not more than 6 months and satisfactory

temperature of stern tube aft bearing monitored (notation MON-SHAFT assigned)

YES

YES

YES

YES NO

NO

NO

NO

NO

single shaft

shaft made of 304 stainless steel

10 years (a)

YES

NO

10 years (b) 5 years 4 years 3 years 2,5 years

NO

5.6.2 For ships of eight years of age and over fitted with one single boiler supplying steam for main propulsion, the interval between two boiler surveys may be specially con-sidered.

5.6.3 (1/7/2006)

External survey of boilers including test of safety and pro-tective devices and test of safety valves using their relieving gear, is to be carried out annually, within the window of the Annual Survey.

For exhaust gas heated economisers, the safety valves are to be tested by the Chief Engineer at sea within the annual sur-vey window. This test is to be recorded in the llog-book for review by the attending Surveyor prior to crediting the Annual Survey of Machinery.

5.6.4 (1/7/2006)

An extension of the internal examination of the boiler up to 3 months beyond the due date can be granted in excep-tional circumstances (see Note 1). The extension may be granted by the Society provided a survey is carried out in accordance with the provisions given in Ch 3, Sec 8, [1.1.6].

Note 1: "Exceptional circumstances" means, for example, unavaila-bility of repair facilities, unavailaunavaila-bility of essential materials, equip-ment or spare parts, or delays incurred by action taken to avoid severe weather conditions.

5.7 Links between anniversary dates and annual surveys, intermediate surveys and class renewal surveys

5.7.1 The link between the anniversary dates, the class renewal survey (when carried out according to the normal system), and the annual and intermediate surveys is given in Fig 3.