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Class Notations in Shipping

Class notation is a symbol or description assigned by a classification society to indicate that a ship complies with specific rules regarding design, construction, machinery, and special features.

It is mentioned in the ship’s Certificate of Classification.

Classification societies:

  • Lloyd's Register

  • DNV

  • American Bureau of Shipping

  • Bureau Veritas

  • Indian Register of Shipping

Types of Class Notations

1️⃣ Main Class Notation

Indicates that:

  • Hull is constructed as per class rules

  • Machinery complies with class standards

  • Surveyed and maintained properly

Example:

  • ✦ +1A1 (Hull)

  • ✦ MC (Machinery Class)

(Notation symbols vary between societies.)

2️⃣ Additional Class Notations

Given for special ship features or enhanced standards.

🔸 Structural Notations

  • Ice Class (Ice strengthened hull)

  • CSR (Common Structural Rules)

🔸 Machinery Notations

  • AUT / AUT-UMS (Unattended Machinery Space)

  • E0 (DNV notation for unmanned engine room)

🔸 Environmental Notations

  • CLEAN DESIGN

  • ECO

  • Green Passport

🔸 Cargo Related Notations

  • Oil Tanker

  • Bulk Carrier

  • Chemical Carrier

  • LPG / LNG Carrier

🔸 Dynamic Positioning

  • DP1 / DP2 / DP3

3️⃣ Statutory Notations

Issued when class acts on behalf of flag state for conventions such as:

  • SOLAS

  • MARPOL

  • Load Line

Under authorization of the flag state and complying with IMO regulations.

(IMO = International Maritime Organization)

Why Class Notations Are Important?

✔ Indicates ship capability
✔ Required for insurance
✔ Required for port entry
✔ Enhances vessel value
✔ Shows compliance with international standards

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