AT 150/130 air whistle, suitable for vessels with a LOA 75m till 200m.
Regulations Before and After COLREG 1972
Before “COLREG 1972” (International Regulations for Preventing Collisions at Sea), low-pitched tones were often used for smaller vessels. However, the principle of reserving low tones for large vessels was not strictly enforced. The IMO regulations now reserve very low tones exclusively for the largest ships. For middle-sized and smaller vessels, there are broader frequency options available.
Signal Preferences and Frequency Range
IMO regulations prioritize signals that maintain audibility even at a distance. Vessels between 75 and 200 meters (246 – 656 feet) should use whistles with frequencies ranging between 130 and 350 Hz. These frequencies ensure effective communication and compliance with maritime safety standards.
Installation Instructions for AT 150/130
Mounting the AT 150/130
Secure the AT 150/130 whistle with four M16 bolts to an outrigger or similar construction. Ensure the structure is stable to prevent any operational issues.
Cleaning the Supply Pipe
Before connecting the supply pipe to the whistle, blow the pipe thoroughly clean. This step is crucial to avoid any functional troubles caused by debris or contaminants in the pipe.
Installing a Primary Filter
If the pipeline above deck exceeds 100 meters (328 feet), install a primary FILTER TP 15/2 at the base of the mast. This filter protects the whistle from water condensate and rust particles, ensuring reliable operation.
Maintaining the Filter
Regular maintenance is essential for ensuring optimal performance. To begin with, it is recommended to drain the filter approximately once a month. By doing so, you can effectively prevent blockages while also maintaining the integrity of the signaling system.
Valve Unit Specifications
The VALVE UNIT TV 784 is designed for efficient air flow, featuring thermostatic heating, exchangeable choke flanges, and filters. It includes two coils for normal and emergency operation, as well as a lanyard, providing reliable functionality.
Contact Us for More Information
If you have any questions or require spare parts for your Kockum Sonics system.
Technical Data
- Frequency: 130 Hz
- Sound Pressure Level (1m):
Total: 148 dB
1/3 octave IMO limit: 138 dB - Air consumption: 35 – 45 I/s
- Air supply pressure with choke regulation:
0,6 – 3 MPa (6 – 30 bar) - Electric power:
Thermostat heating: 24 W
Valve: 27 W - Weight: 65 kg
- For wiring diagram: see Valve Unit TV 784.
