Critical Structural Areas [ A.744(18)/ 1.2.10]:
These are locations which have been identified from
calculations, monitoring or from the service history of the subject ship or
from similar or sister ships to be sensitive to cracking, buckling or corrosion
which would impair the structural integrity of the ship.
Thickness measurements taken during following surveys will
enable specific software programmes developed by the classification societies
to forecast structural soundness of the ship.
1. Bulk Carrier Safety : Cargo
Hold No. 1 with corrugated WT Bulkhead STRENGTH MEMBERS / bulk head plate
thickness / stiffeners scantlings/ stool strength/ DB under hold strength
members.
These readings are taken to determine if the ship can load
cargoes with densities more than 1.78t/m3
2. Strengthening of frames of ‘Other Cargo holds ‘.Readings
are taken to assess strength as per UR S31
3. Thickness measurements at Intermediate, Special Surveys,
CAS surveys to assess longitudinal strength.
4. CAP to carry out Fatigue analysis.
5. Analysis carried out at any structural failure.
Above referred surveys provide input data for structural
analysis carried out by soft ware programmes developed by each Classification
Society.
These inputs acquired are:
- Fatigue Analysis is computed on basis of the design and application of finite element analysis to arrive at fatigue life of various structural strength members. Such theoretically derived data is validated and cross checked by actual results emanating from surveys.
- Results of thickness measurements obtained at instances mentioned above give residual strength.
Above data is used during the surveys by surveyors to
concentrate on areas of concern.
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