1.1.1 Survey requirements
are given in Vol 1, Pt 1, Ch 3, 4.2 Docking Surveys of
the Rules and Regulations for the Classification of Naval Ships (hereinafter
referred to as the Rules for Naval Ships).
1.1.2 All requests
for postponement of Docking Surveys should be referred to the LR Naval
liaison office.
1.1.3 The relevant
part of the survey checklist is to be used when carrying out these
surveys.
1.1.4 The Docking
Survey required in each six year period should coincide with the Special
Survey. At the Docking Survey, the Surveyor should draw the attention
of the Owner/Naval Authority to the need to examine the chain locker,
anchors and chain cable, and to conduct a thickness determination
of the underwater shell plating as part of the Special Survey, should
it be necessary.
1.1.5 When a ship
is in dry-dock the ballast tanks are normally drained. It is therefore
advantageous that, where possible, the Annual or Intermediate Surveys
should be held at the same time as the Docking Survey to facilitate
any inspection of these spaces which these surveys may require.
1.1.6 At Docking
Surveys particular attention should be paid to any application or
renewal of high resistance paint coating systems to the underwater
portion of the hull. Surveyors should submit particulars of the maker
and coating materials and ensure that a suitable record is made in
the memoranda.
1.1.7 Recognized
high resistance paint coatings fall into the following categories:
-
Epoxide.
-
Coal tar epoxide.
-
Vinyl and vinyl tar.
-
Polyurethane and polyurethane
tar.
-
Chlorinated rubber.
-
Bituminous aluminium.
It is essential that the dry film thickness of the anti-corrosive
coating is of the order of 200 microns (0,20 mm).