Learn More about Compressed Air Whistle

MAIN PERFORMANCE DATA

The main technical data such as sound pressure level at 1/3 rd band level & sound frequency are fully are fully complied to the International Regulation for preventing Collision at Sea (COLREG)1972 and the regulation of Legal Inspection for Vessel at Sea issued by Chinese Vessel Inspection Bureau. The site inspection by inspector of Guangzhou Vessel Inspection Bureau had been done, and certificate has been issued.

TECHNICAL DATAS

WORKING CONDITION

• Ambient temperature:-25˜+55℃ 

• Ambient relative humidity:92%~98% 

• When oscillation-frequency is 2~13.2Hz, the displacement range is+1mm; 

When the frequent is13.2~80Hz, The acceleration range is+0.7g.

CONSTRUCTION & PRINCIPLE

The power source of air whistle is the compressed air. The whistle combines with pronouncing body, control valve, magnetic valve and thermal device complete. It can be whistled by manners of magnetic valve or manual pull rope. Please see Fig about the construction of WD-2A . The thermal device complete is applicable for navigation at icing period, which is controlled by the heating switch. When the power is switched on, the body temperature of whistle is always kept above 0℃, in order to prevent for icing up at low temperature, which maybe affect the sound quality.

INSTALLATION & MAINTENANCE

● The whistle shall be placed as high as practicable on a vessel, such as foremast, in order to reduce interception of the emitted sound by obstruction and also to minimize hearing damage risk to the personnel. The sound pressure level of a vessel’s own signal at listening posts shall not exceed 110 dB(A), and so far as practicable should not exceed 100dB(A).

● The whistle shall be installed according to holes dimension shown in Fig the total center of gravity of whistle shall be at the back of the horn. The installation must be firm & reliable enough. The connection of parts and fixtures must be checked during installation. 

● A rod spring (not indicated in construction figure) is provided at delivery. It should be placed at the pull rope, ensuring tone is accurate when controlled by manual pull rope.

● It is better to equip with a special air tank, whose volume shall be ≥1.7*10m3 (440*1100mm). The compressed air pipe should be made of seamless steel tube (inner diameter is 25mm). The air pipeline shall be set with less zigs, in order to keep the air flow unblocked.

● After the installation of whistle and air pipe, the output cables of the controller located in steering house are connected to the magnetic valve & thermal device. A whistle test can be done via pulling pull rope. If the sound and other function have met the requirement, the whistle can be finally use for navigation.

● The whistle shall be inspected every a year or half a year, in order to give early warning of any faults that may develop. The normal trouble-shooting may be as following:

1) The electric switch fails. Cause: The coil of magnetic valve is short circuit and cut off, or the coil is overheat. Action: To replace the magnetic valve. 

2) The resident time of pronouncing switch is too long. Cause: The 1 hole is blocked; The active spring is transmutative or the screw is too tight. Action: Remove the M8 which fixed magnetic valve and replace the spare parts or the complete magnetic valve. 

3) The whistle released sound by itself. Cause: The air is leaked from the magnetic valev; The spring of valve is transmutative; the rubber ring of control valve is damaged or the iron housing of magnetic valve is broken or leakage. Action: Remove the M8 which fixed the magnetic valve and replace the spare parts or the complete magnetic valve. 

4) The sound cannot be released. Cause: The distance between the film and the whistle body is has changed; The film is broken; The piston or air valve is blocked. Action: Re-adjust the film or replace the film; Check the piston. When the air valve is block, take out the flow bolt and pull the rod by hand, to vent out the rust or dust inside pipe by compressed air.

THE FOLLOWING SPARE PARTS WILL BE APPENDED WHEN DELIVERY:

(1) Valve spring of magnetic valve :2 

(2) Spring of piston :2 

(3) Rubber ring of control valve :2 

(4) Film :1 (2pieces for WD-1A) 

(5) M12 Bolt :4 

(6) Washer for air inlet :2 

(7) Thermal tube :1 

(8) Spring of rod :1

If you happen to also need this product, please feel free to contact Deyuan Marine at any time.