CHIMNEYS

AVIATION OBSTRUCTION LIGHTS ON CHIMNEYS APPLICATIONS

A chimney is a typical cylindrical and vertical structure that provides ventilation for hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside atmosphere.

In the special case of chimneys, cooling towers, and flare stacks lights may be displayed as low as 20 feet (6-m) below the top to avoid the obscuring effect of deposits and heat generally emitted.

BASIC RULES

  • The number of light levels recommended depends on the height of the structure;
  • The number and arrangement of light units at each level should be placed so the lighting is visible from every angle in azimuth;
  • Lights are applied to display the general definition of an object or a group of buildings;
  • The top obstruction lights should be placed sufficiently below the top so as to minimize contamination by smoke, etc
  • The diameter of the structure determine the number of obstruction lights installed at the top and at each light level.
Aviation obstruction system Chimney

LIGHTS SPECIFICATIONS

  • Low intensity lights should be used for structure with H ≤ 45 m during night time, if those are considered inadequate, than medium – high intensity lights should be used.
  • Medium intensity lights type A,B or C should be used to lit extensive object (group of buildings or tree) or structure with 45 m < H ≤ 150 m.
  • Note: Medium intensity lights, type A and C should be used alone, whereas medium intensity lights, Type B should be used either alone or in combination with LIOL-B.
  • High intensity type A, should be used to indicate the presence of an object if its H > 150 m and an aeronautical study indicates such lights to be essential for the recognition of the object by day.

AVIATION OBSTRUCTION LIGHT MARKINGS

There is 3 option for lighting a chimney with aviation obstruction light systems.

  1. If the chimney is to be lighted only at night with red light
    • If the authorities state that there is no need to light the day
    • If the chimney marked with paint (white-red strip)
  2. If the chimney is to be lighted day and night with white light
  3. If the chimney is to be lighted with white light at daytime and with red light at night time
    • If the authorities state that white light is too much discomfortable at night

1 – IF THE CHIMNEY IS TO BE LIGHTED ONLY AT NIGHT

HEIGHT N° OF LEVELS
H ≤ 45m Only one level: Low intensity
 

45m < H ≤ 105m

2 levels:

Top level: Medium intensity – B Type;

Intermediate level: Low / Medium intensity – B Type.

 

 

105m < H ≤ 210m

4 levels:

Top level: Medium intensity – B Type;

First Intermediate level: Low / Medium intensity – B Type;

Second Intermediate level: Medium intensity – B Type;

Lower Intermediate level: Low / Medium intensity – B Type.

Number of Levels According to Height

chimney red aviation obstruction light

N° of lights depends on the diameter

chimney aviation obstruction light diameters

2 – IF THE CHIMNEY IS TO BE LIGHTED DAY AND NIGHT WITH WHITE LIGHTS

Number of Levels According to Height

chimney white aviation obstruction light.png
HEIGHT N° OF LEVELS
H ≤ 105m Only one level: Medium intensity – A Type
 

105m < H ≤ 210m

2 levels:

Top level: Medium intensity – A Type;

Intermediate level: Medium intensity – A Type.

 

210m < H ≤ 315m

3 levels:

Top level: Medium intensity – A Type;

Intermediate level: Medium intensity – A Type;

Lower Intermediate level: Medium intensity – A Type.

3 – IF THE CHIMNEY IS TO BE LIGHTED WITH WHITE AND RED LIGHTS

HEIGHT N° OF LEVELS
 

H ≤ 105m

2 levels:

Top level: Medium intensity – AB Type;

Intermediate level: Low / Medium intensity – B type.

 

 

 

105m < H ≤ 210m

4 levels:

Top level: Medium intensity – AB Type;

First Intermediate level: Low / Medium intensity – B Type;

Second Intermediate level: Medium intensity – AB Type;

Lower Intermediate level: Low / Medium intensity – B Type;

Number of Levels According to Height

chimney white red aviation obstruction light.png