Section
3 Shell envelope
3.1 General
3.1.1 This
Section contains local scantling requirements applicable to the shell
envelope. Each applicable sub-Section is to be evaluated to determine
the governing scantling requirement as follows:
- All shell envelope structure over the length of the ship is to
be evaluated according to Vol 1, Pt 6, Ch 4, 3.2 Requirements due to design pressures and Vol 1, Pt 6, Ch 4, 3.3 Additional minimum requirements.
- All bottom structure in way of a single bottom is to be evaluated
against the requirements of Vol 1, Pt 6, Ch 4, 3.4 Single bottom.
- All bottom structure in way of a double bottom is to be evaluated
against the requirements of Vol 1, Pt 6, Ch 4, 3.5 Double bottom.
- Where applicable, bottom and side shell structure below the waterline
is to be evaluated against the slamming requirements in Vol 1, Pt 6, Ch 4, 3.6 Strengthening due to bottom slamming.
- Side shell above the waterline is to be evaluated against the
requirements of Vol 1, Pt 6, Ch 4, 3.7 Slamming above the waterline.
3.2 Requirements due to design pressures
3.3 Additional minimum requirements
3.3.2 If the
Complementary Rules are the Rules for Ships then the scantlings of
plating and stiffeners are not to be less than those given in:
3.3.3 If the
Complementary Rules are the Rules for Naval Ships then the scantlings
of plating and stiffeners are not to be less than those given in Table 3.2.1 Minimum structural
requirements in Vol 1, Pt 6, Ch 3
of the Rules for Naval Ships.
3.3.4 If the
Complementary Rules are the Rules for Special Service Crafts then
the scantlings of plating and stiffeners are not to be less than those
given in Table 3.2.1 Minimum thickness
requirements in Vol 1,
Pt 6, Ch 3 of the Rules for Special Service Craft.
3.4 Single bottom
3.4.1 The
requirements of this sub-Section are applicable to the bottom structure
of vessels having a single bottom.
3.4.2 If the
Complementary Rules are the Rules for Ships then the scantlings of
plating and stiffeners are not to be less than those given in:
3.5 Double bottom
3.5.1 The
requirements of this sub-Section are applicable to the bottom structure
of vessels having a double bottom.
3.5.3 If the
Complementary Rules are the Rules for Ships then the scantlings of
plating and stiffeners are not to be less than those given in:
3.5.4 If the
Complementary Rules are the Rules for Special Service Craft then the
scantlings of plating and stiffeners are not to be less than those
given in Pt 6, Ch 4, 6 Double bottom structure of the Rules
for Special Service Craft.
3.6 Strengthening due to bottom slamming
3.6.1 If the
Complementary Rules are the Rules for Naval Ships then the scantlings
of plating and stiffeners are not to be less than those given in Vol 1, Pt 6, Ch 3, 1.4 Equivalents of the Rules
for Naval Ships using the pressure, IP
bi,
calculated according to Vol 1, Pt 5, Ch 5, 2.4 Bottom impact pressure.
Note that for calculation of h
s according
to Vol 1, Pt 6, Ch 3, 14.2 Strengthening of bottom forward 14.2.8 of
the Rules for Naval Ships:
where
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= |
f
DLF is to be taken as 1,0.
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3.7 Slamming above the waterline
3.7.1 If the
Complementary Rules are the Rules for Naval Ships then the scantlings
of plating and stiffeners are not to be less than those given in Vol 1, Pt 6, Ch 3, 15 Strengthening for wave impact loads above waterline of the Rules for
Naval Ships using the pressure, IP
wi, calculated
according to Vol 1, Pt 5, Ch 5, 2.5 Wave impact pressure above waterline.
Note that for calculation of h
s according
toVol 1, Pt 6, Ch 3, 15.2 Strengthening against bow flare wave impacts 15.2.2 of
the Rules for Naval Ships:
where
|
|
= |
f
DLF is to be taken as 1,0.
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3.7.2 If the
Complementary Rules are the Rules for Ships then the scantlings of
plating and stiffeners are not to be less than those given in Pt 3, Ch 5, 1.6 Strengthening against bow flare slamming, Pt 4, Ch 2 Ferries, Roll On-Roll Off Ships and Passenger Ships and Pt 4, Ch 8 Container Ships of the Rules for Ships, depending on the particular
ship type, using the pressure, IP
wi, calculated
according to Vol 1, Pt 5, Ch 5, 2.5 Wave impact pressure above waterline.
Note that for calculation of h
s according
to Pt 4, Ch 2 Ferries, Roll On-Roll Off Ships and Passenger Ships of the Rules for Ships:
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