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DNV-OS-C201 Structural Design of Offshore Units (WSD method)
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Sec.4
B. Temperatures for Selection of
Material
Sec.4
B 100 General
Sec.4 B
101 The design temperature for a unit is the reference temperature
for assessing areas where the unit can be transported, installed
and operated.The design temperature shall be lower or equal to the lowest mean daily temperature in
air for the relevant areas. For seasonal restricted operations the lowest mean daily temperature in
air for the season may be applied.
Sec.4 B
102 The service temperatures for different parts of a unit apply
for selection of structural steel.
Sec.4 B
103 The service temperature for various structural parts is given
in B200 and B300. In case different service temperatures are defined
in B200 and B300 for a structural part the lower specified value
shall be applied. Further details regarding service temperature
for different structural elements are given in the sections for different
types of units.
Sec.4 B
104 In all cases where the temperature is reduced by localised
cryogenic storage or other cooling conditions, such factors shall
be taken into account in establishing the service temperatures for
considered structural parts.
Sec.4
B 200 Floating units
Sec.4 B
201 External structures above the lowest waterline shall be designed
with service temperature not higher than the design
temperature for the area(s) where the unit is to operate.
Sec.4 B
202 External structures below the lowest waterline need not be
designed for service temperatures lower than 0°C. A higher service
temperature may be accepted if adequate supporting data can be presented
relative to the lowest mean daily temperature applicable to the
relevant actual water depths.
Sec.4 B
203 Internal structures in way of permanently heated rooms need
not be designed for service temperatures lower than 0°C.Sec.4
B 300 Bottom fixed units
Sec.4 B
301 External structures above the lowest astronomical tide (LAT)
shall be designed with service temperature not higher than the design temperature.
Sec.4 B
302 Materials in structures below the lowest astronomical tide
(LAT) need not be designed for service temperatures lower than of
0°C. A higher service temperature may be accepted if adequate supporting
data can be presented relative to the lowest
mean daily temperature applicable for the relevant water
depths.
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