Material selection
shall be optimized, considering investment and operational costs, such that
Life Cycle Costs (LCC) are minimized while providing acceptable safety and
reliability. The following key factors apply to materials selection:
• Primary consideration
shall be given to materials with good market availability and documented
fabrication and service performance.
• The number of
different material types shall be minimized considering costs,
interchangeability and availability of relevant spare parts.
• Design life.
• Operating conditions.
• Experience with
materials and corrosion protection methods from conditions with similar
corrosivity.
• System availability
requirements.
• Philosophy applied
for maintenance and degree of system redundancy.
• Weight reduction.
• Inspection and
corrosion monitoring possibilities.
• Effect of external
and internal environment, including compatibility of different materials.
• Evaluation of failure
probabilities, failure modes, criticalities and consequences. Attention shall
be paid to any adverse effects material selection may have on human health,
environment, safety and material assets.
• Environmental issues related to corrosion
inhibition and other chemical treatments.
• For main systems
where materials/fabrication represent significant investments and/or
operational costs, an LCC analysis shall be basis for material selection (Ref.
Annex A).
Deviation from
specified material selections
Where an overall
evaluation of LCC, safety and reliability shows that it is more cost effective
to deviate from the specific materials selections and corrosion protection
principles given in this document and the NORSOK standards referenced herein
the alternative solution should be implemented. Such deviations may include
replacement of CRAs with carbon steel where CRAs are specified in this
standard.
Suppliers standard
materials shall be used for equipment, provided that:
• This is cost
efficient.
• The supplier can
document previous successful experience.
• The materials satisfy
the general requirements given in this document with respect to corrosion
resistance and/or maintenance and replacement.
sumber :
https://books.google.co.id/books?isbn=0080445667
http://www.standard.no/PageFiles/1174/M-DP-001r1.pdf
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