Page 51 - Ship Construction.DJ Eyres 6Ed

Ch04-H8070.fm Page 40 Wednesday, October 18, 2006 6:52 AM
40 Ship Construction
paid to the shell plating, stern frame and rudder, external and through hull
fittings, and all parts of the hull particularly liable to corrosion and chafing,
and any unfairness of bottom.

IN-WATER SURVEYS The society may accept in-water surveys in lieu of
any one of the two dockings required in a five-year period. The in-water
survey is to provide the information normally obtained for the docking
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survey. Generally consideration is only given to an in-water survey where a
suitable high resistance paint has been applied to the underwater hull.
1. Special survey of ships – five years old ์ฝกพาณิชย์นาวี
SPECIAL SURVEYS All steel ships classed with Lloyds Register are
subject to special surveys. These surveys become due at five yearly intervals,
the first five years from the date of build or date of special survey for classi-
fication and thereafter five years from the date of the previous special survey.
Special surveys may be carried out over an extended period commencing
not before the fourth anniversary after building or previous special survey,
but must be completed by the fifth anniversary.
The hull requirements at a special survey, the details of the compartments
to be opened up, and the material to be inspected at any special survey are
listed in detail in the Rules and regulations (Part 1, Chapter 3). Special sur-
ึ
vey hull requirements are divided into four ship age groups as follows:
งานห้องสมุด ศูนย

2. Special survey of ships – ten years old
3. Special survey of ships – fifteen years old
4. Special survey of ships – twenty years old and at every special survey
thereafter

In each case the amount of inspection required increases and more mate-
rial is removed so that the condition of the bare steel may be assessed. It
should be noted that where the surveyor is allowed to ascertain by drilling
or other approved means the thickness of material, non-destructive meth-
ods such as ultrasonics are available in contemporary practice for this pur-
pose. Additional special survey requirements are prescribed for oil tankers,
dry bulk carriers, chemical carriers and liquefied gas carriers.
When classification is required for a ship not built under the supervision
of the Society’s surveyors, details of the main scantlings and arrangements
of the actual ship are submitted to the Society for approval. Also supplied are
particulars of manufacture and testing of the materials of construction
together with full details of the equipment. Where details are not available, the
Society’s surveyors are allowed to lift the relevant information from the ship.
At the special survey for classification all the hull requirements for special
surveys (1), (2), and (3) are to be carried out. Ships over 20 years old are
also to comply with the hull requirements of special survey (4), and oil