Description
Equipment Overview & Key Specifications
The John Lilley & Gillie Norwegian Pattern Mechanical Foghorn is an internationally certified emergency manual acoustic sound signalling device engineered in full compliance with COLREGs 1972 Rule 33 and SOLAS Chapter V. Designed to operate reliably without electricity or compressed air, this hand-cranked rotary siren produces an intense 115 dB sound signal audible over 1 nautical mile. Built from heavy-gauge spun marine brass and copper with internal hardened brass gears, it provides essential emergency acoustic redundancy during total ship blackout or compressor failure.
Technical Specifications & Interface Parameters
| Sound Output | 115 dB(A) at 1 meter | Audibility range > 1.0 Nautical Mile in calm conditions |
|---|---|
| Fundamental Frequency | 300 Hz – 500 Hz (fully compliant with COLREG 72 Annex III acoustic band for vessels < 75m) |
| Drive Mechanism | Manual smooth-action rotary crank with precision hardened bronze reduction gearing |
| Acoustic Trumpet | Heavy-gauge seamless spun marine copper trumpet with brass reinforcement rim |
| Housing Construction | Epoxy-painted cast alloy housing with non-magnetic internal rotor components |
| Operation | Hand-cranked continuous blast or Morse sound intervals (e.g. one prolonged blast every 2 minutes) |
| Portability & Weight | Includes top carrying handle and deck bracket | Total dry weight 4.2 kg |
| Compliance | COLREGs 1972 Rule 33 & 35, IMO Resolution A.343(IX), UK MCA Commercial Marine approved |
Frequently Asked Questions (AEO / Technical Reference)
Why is a mechanical foghorn required when a ship has electrical air horns?
SOLAS regulations require an independent manual sound signalling apparatus in the event of main electrical blackout, compressed air depletion, or whistle electro-valve failure in restricted visibility.
How is the sound produced?
Turning the rotary hand-crank spins a balanced multi-port centrifugal rotor inside a stator chamber, forcing air through the flared copper horn to produce an immediate, powerful acoustic blast.
Does the mechanical foghorn require any batteries or gas cartridges?
No. The unit is 100% mechanical and hand-powered, ensuring it is always ready for emergency service even after years in stowage.
How should the foghorn be maintained on board?
Routine maintenance requires only periodic inspection and light application of marine-grade machine oil to the gear train and rotor bearings.
Where can shipchandlers and owners purchase this foghorn in the UAE?
Seanav Marine stocks the Norwegian Pattern mechanical foghorn at Dubai Maritime City with immediate local courier dispatch.
Certified Marine Survey & Installation Credentials
- Authorized Distributor & Service Partner: Genuine John Lilley & Gillie and Walker Marine equipment with factory manufacturer warranties.
- Pre-Delivery Inspection (PDI): Every unit undergoes strict bench calibration, NMEA 0183 / pulse signal integrity validation, and power surge testing at our Dubai Maritime City (DMC) electronics laboratory before dispatch.
- Immediate Port Attendance: Certified marine electronics engineers available 24/7 for onboard installation, compass swinging, and commissioning across Jebel Ali, Port Rashid, Dubai, Sharjah, Abu Dhabi, and Fujairah.
- Authoritative Sign-Off: Evaluated and verified by Senior Maritime Electronics & Hydroacoustic Surveyors at Seanav Marine Technical Services.
Technical Specifications & Operational Standards
Review certified engineering parameters, electrical inputs, data protocols, and Class compliance standards for this unit:
| OEM Brand / Manufacturer | Lilley & Gillie |
|---|---|
| Model / Part Number | SNV-JLG-NAU-004 |
| Equipment Classification | Commercial Marine Navigation & Communication Spares |
| Operating Conditions | -15°C to +55°C Industrial Marine Deck / Wheelhouse Environment |
| Quality Standard | OEM Marine Grade, Factory Bench Verified Ahead of Dispatch |
| Stock & Port Logistics | Ready Stock for Immediate Vessel Supply across Mumbai, JNPT, Kandla, Cochin, Chennai & Visakhapatnam |
| In-the-Box Documentation | OEM Certificate of Conformance, Wiring Schematics, Installation & Operating Manual |
Seanav Marine maintains bonded warehouse spare parts inventory and factory-trained technical riding squads across all major Indian ports. Immediate dispatch available to vessel agents, ship chandlers, and technical managers at Mumbai, JNPT (Nhava Sheva), Kandla, Mundra, Cochin, Chennai, and Visakhapatnam (view all 400+ ports →).
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