3.1.1 In addition
to cases where direct calculations are specifically required by the
Rules, LR will consider alternative arrangements and scantlings which
have been derived by direct calculations in lieu of specific Rule
requirements. All direct calculations are to be submitted for examination.
3.1.2 Where
calculation procedures other than those available within ShipRight
are employed, supporting documentation is to be submitted for appraisal
and this is to include details of the following:
- calculation methods, assumptions and references;
- loading;
- structural modelling;
- direct criteria and their derivation, e.g. permissible stresses,
factors of safety against plate panel instability, etc.
3.1.3 LR will
be ready to consider use of Builders' programs for direct calculations
in the following cases:
-
Where it can be
established that the program has previously been satisfactorily used
to perform a direct calculation similar to that now submitted.
-
Where sufficient
information and evidence of satisfactory performance is submitted
to substantiate the validity of the computation performed by the program.