JT/T 321-2020 in English

Background of Standard Evolution

This standard replaces JT/T 321-1997 version. The main technical changes include:

Core technical requirements

1. Lighthouse classification system

Using dual dimensions for classification:

• Class A lighthouse: isolated islands/islands below the township level
• Class B lighthouse: mainland/islands above the township level

Lighting range classification standards:

2. Main structure specifications

Key parameter requirements:

• Tower height: ≥8m (including lantern)
• Staircase form: inward spiral stairs are preferred, and the vertical span of straight ladders is ≤3m
• Door and window standards: dual requirements of watertightness and anti-theft

The newly added color specification requires that the color of the tower and the lantern must ensure conspicuousness during the day.

3. Upgrade of intelligent facilities

Reflect the changes in modern navigation needs:

• Mandatory configuration of automatic switching system for main and standby lights
• New requirements for telemetry and monitoring facilities (Article 12.5)
• Allow expansion to integrated maritime information platform (Article 12.6)

Implementation suggestions

1. Connection between old and new standards

Special attention should be paid to reconstruction projects:

• The power supply system must comply with the natural energy power supply requirements of Article 8.3
• The deleted mechanical water supply facilities (1997 version 8.1.2) need to be replaced
• The additional helicopter platform must comply with the MH 5013 standard

2. Configuration of key facilities

Differentiated configuration according to lighthouse type:

3. Key Points of Safety Management

Articles to Pay Attention to:

• Article 6.6: A manned elevator is required for towers >16m
• Article 11.1.2: A 1.1m guardrail is required for height differences >1.2m
• Article 12.3: Fire-fighting facilities must comply with GB 50016