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Section 2 Environmental Conditions
201. General
As a minimum requirement, the design, selection and arrangement of all machinery, instruments and equipment located on board submersibles are required to conform to the environmental conditions stated below. Environmental conditions other than those stated may be approved for submersibles for service only in particular areas.
202. Inclined positions
Satisfactory operation is to be ensured at shaking of 60° , heeling of 30° and trimming of 15° in any direction measured in relation to the as installed datum. Transient inclinations of up to 45 are not to adversely affect operation and not cause damage, particularly to machine mountings.
203. Water
The design of submersibles and components is generally to be based on seawater within the tem- perature range from - 2°C to +32°C, with a salt content of 35 ppm and a density of 1.028 kgĤmĖ, A value of 0.101 bar/m is to be applied when converting diving depth to pressure.
204. Seaways
Submersibles are to be designed for sea states with a significant wave height of at least 2 m, al- lowance being made for accelerations of 2 g downwards and 1 g upwards in the vertical and 1 g each in the longitudinal and transverse directions (Ŷ = 9.81 mĤsË).
205. Climate
In all spaces, allowance is to be made for oil and salt-impregnated air ranging in temperature from 0° to 55°C Atmospheric humidity may attain 100 % in the lower temperature range. Condensation is liable to occur. In specially protected control rooms, a relative atmospheric humidity of 80 % at
a reference temperature of 40°C is to be assumed. Equipment and instruments are to to function satisfactorily despite fluctuations in the air pressure inside the pressure
be continued hull ranging
Pt 1 Submersibles
Ch 4 Design Requirements Pt 1, Ch 4
from 0.7 to 1.3 bar. In the diver's lockout and in compression chambers, equipment and instruments should be designed for 1.5 times the maximum permissible working pressure.
206. Vibrations and shaking
Machinery is not to cause any vibration or shaking which imposes unacceptable stresses on other machines, equipment or the hull of the vehicle and it is to be complied with the Rules separately provided by this Society.