NIMASA STCW Tanker Familiarization Practice Questions - NIMASA STCW Tanker Familiarization Examination (Nigeria) Exam

Why is solid stainless steel preferred over coated mild steel for cargo tanks carrying high-purity chemical cargoes?

Stainless steel is non-porous and chemically inert, making it easy to clean and highly resistant to aggressive acids, whereas coatings can degrade or absorb chemical residues. Stainless steel is much cheaper to construct and weld on a large scale than epoxy-coated mild steel. Stainless steel naturally eliminates static electricity without requiring grounding cables. Coated mild steel tanks must be completely replaced after carrying a single cargo of alcohol.

Correct Answer:

Stainless steel is non-porous and chemically inert, making it easy to clean and highly resistant to aggressive acids, whereas coatings can degrade or absorb chemical residues.

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