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Ballast Water Management Standards: D-1, D-2, D-3 2026 Guide

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Category: Enseñanzas náuticas, formación, cursos
Published on Tuesday, 27 January 2026 07:27
Written by Administrator2
Hits: 369

 

 

 

M. PUBLIC

Mastering Exchange Methods, Treatment Systems, and Compliance Planning

 

QUICK ANSWER: BALLAST WATER MANAGEMENT METHODS

Regulatory Standards:
► D-1 Standard: Ballast water exchange in open ocean achieving 95% volumetric replacement
► D-2 Standard: Treatment system performance limits for viable organisms and indicator microbes
► D-3 Standard: Approval for alternative ballast water management methods proving equivalent environmental protection

Exchange Methods (D-1 Compliance):
• Sequential Method: Empty tank completely, then refill with ocean water for 95% volumetric exchange
• Flow-Through Method: Pump replacement water through tank with overflow, requires 3x tank volume pumped
• Dilution Method: Fill from top while displacing from bottom, achieves mixing and replacement simultaneously

Key Compliance Differences:
► D-1 allows ballast water exchange as compliance method until specified renewal survey dates
► D-2 requires treatment systems meeting organism concentration limits regardless of exchange location
► D-3 permits alternative methods approved by IMO MEPC demonstrating equivalent or better protection
► Ships constructed after September 2017

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D G Shipping Advised to Revoke Circular on Crew Certifications

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Category: Enseñanzas náuticas, formación, cursos
Published on Tuesday, 27 January 2026 06:36
Written by Administrator2
Hits: 165
  •  India, Maritime News, Seafarers
  • By Associate Editor

In India, approximately 80% of seafarers work on foreign-flagged ships, making the recent directive from the Directorate General of Shipping (DGS) controversial. A circular issued on July 18 prohibits Indian seafarers with certificates from non-recognized maritime administrations from sailing on these vessels, a move intended to address what the DGS termed “fraudulent” practices in obtaining maritime certifications.

This directive has incited intense backlash from the maritime community, particularly as many fear losing their jobs. The Forward Seamen’s Union of India (FSUI) has led demonstrations to demand the withdrawal of the circular, describing it as a severe threat to employment for thousands of Indian seafarers. The FSUI calls into question the validity of only allowing certifications from Indian maritime authorities or from

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Anchor and Anchor Chain Tests: SOLAS, Class Requirements

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Category: Enseñanzas náuticas, formación, cursos
Published on Monday, 26 January 2026 07:35
Written by Administrator2
Hits: 500

 

 

 

 

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Marine Law

 

Proof loads, breaking tests and certification for maritime anchors


QUICK ANSWER: ANCHOR AND CHAIN TESTING ESSENTIALS

Anchor Tests Required:
► Proof load test for all anchors exceeding 76 kg
► Drop test for cast steel anchors where required by Class
► Material tests on sample pieces per approved standards
► Visual and dimensional inspection after testing
► Freedom from cracks, deformation or defects confirmed

Chain Cable Testing:
• Proof load test on entire 27.5 m shackle length
• Breaking load test on additional sacrificial links
• Applies to chain cables 12.5 mm diameter and above
• Dimensional verification of link length, breadth and diameter
• Two successive link failures result in rejection
• Material quality verification before mechanical testing

Anchor Certificate Contents:
► Anchor type and weight excluding stock
► Stock

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Different Stages of Ship Design Explained

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Category: Enseñanzas náuticas, formación, cursos
Published on Monday, 26 January 2026 08:44
Written by Administrator2
Hits: 204

marine Insight

BySubhodeep Ghosh
 
February 17, 2025Naval Architecture
 

Ship design is a convoluted process that involves multiple steps before the construction and fabrication work is commenced. When we use the word convoluted, it not only means complex but also a roadmap where with each stage, the methodology becomes more specific and refined and the shipbuilding process gets closer to being commenced. 

The various stages of ship design are discussed below.

Concept Design 

Unlike a car or a commercial aircraft, a ship is designed specifically based on the exact requirements of the mission and the optimization of various parameters and resources. 

This is the preliminary stage at the outset of the entire design cycle, where the vessel’s operational requirements are identified. Operational or mission requirements essentially mean a study

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Dynamic response analysis of alternative mooring system designs for a 15 MW floating wind turbine with an emphasize on different limit states

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Category: Enseñanzas náuticas, formación, cursos
Published on Saturday, 24 January 2026 05:03
Written by Administrator2
Hits: 143

https://www.sciencedirect.com/science/article/abs/pii/S0029801824031251

 

, , Yang Yang a, , , , 
 
 
https://doi.org/10.1016/j.oceaneng.2024.119787Get rights and content
 

Highlights

  • •
    Fully coupled numerical model of a large-scale three-column 15 MW semi-submersible floating wind turbine.
  • •
    Different catenary mooring line lengths, lumped weights, buoyancy cans, horizontal mooring angle, fairlead height etc. are studied for optimized mooring system solution.
  • •
    Dynamics of various mooring system designs are comprehensively investigate with emphasizes on different design limit states.
  • •
    Further dynamic response analysis of an optimized design is performed to verify the feasibility of the mooring system under various design limit states.

 

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