This standard specifies the shape, color, light, sound and radio signals of underwater buildings (structures) in China's sea areas. This standard applies to buildings (structures) with fixed positions and underwater buildings (structures) in navigable waters in China's sea areas. This standard does not apply to buildings (structures) specially set up as navigation aids, nor to cross-sea bridges. GB 17380-1998 Regulations on underwater buildings (structures) in China's sea areas GB17380-1998 Standard download decompression password: www.bzxz.net

GB17380--1998
This standard is formulated in accordance with the principles of the International Association of Navigational Aids to Marine Buildings (IALA) and the relevant provisions of GB4696-84 "Water Aids to Navigation in China's Sea Areas". From the date of implementation of this standard, newly built underwater buildings (structures) in sea areas must comply with the provisions of this standard; existing underwater buildings (structures) in sea areas must comply with the provisions of this standard two years after the implementation of this standard. Appendix A of this standard is a reminder appendix.
This standard is proposed by the Ministry of Transport of the People's Republic of China. This standard is under the jurisdiction of the Safety Supervision Bureau of the Ministry of Transport of the People's Republic of China. This standard is drafted by the Safety Supervision Bureau of the Ministry of Transport of the People's Republic of China, the Institute of Standards and Metrology of the Ministry of Transport, the Tianjin Maritime Safety Supervision Bureau of the Ministry of Transport, and the Shanghai Maritime Safety Supervision Bureau of the Ministry of Transport. The main drafters are: Zhang Guowei, Hu Jiangshan, Meng Qingzhong, Dong Shujiang, Liu Yuyu, Zhang Fushun. This standard is interpreted by the Safety Supervision Bureau of the Ministry of Transport of the People's Republic of China. 50
1 Scope
National Standard of the People's Republic of China
The regulation for the marking of offshore structures in ChinaGB17380—1998
This standard specifies the shape, color and light, sound and radio signals of marking of offshore structures in China's offshore areas. This standard applies to offshore structures with fixed positions in the navigable waters of China's offshore areas. This standard does not apply to structures specially set up as aids to navigation, nor to cross-sea bridges. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB4696-84 Aids to navigation in China's offshore areas 3 Definitions
This standard adopts the following definitions.
3.1 Offshore structures in the sea area [hereinafter referred to as offshore structures] refers to permanent or temporary fixed-position structures in the sea area. Such as drilling platforms, oil production platforms, data platforms for collecting marine hydrological data, and external auxiliary structures of oil wells. 3.2 Effective intensity of rhythmic light Under the same environment and equipment conditions, if the luminous intensity of a fixed light source and a rhythmic light source is equal, the luminous intensity of the fixed light source is the effective intensity of the rhythmic light. 4 Technical requirements
4.1 Main lights
4.1.1 Any building (structure) should be equipped with one or more flashing white lights working synchronously at appropriate locations to ensure that when a ship sailing at night approaches it from any direction, at least one flashing white light can be seen. 4.1.2 The installation height is: between 6 and 30 meters above the average high tide level of the building (structure). 4.1.3 The flash rhythm shall meet the requirements of Morse code U (··--), with a cycle of 15s. The composition of Morse code shall meet the following requirements:
a) short light (dot) 0.5s, the duration of darkness between two lights (dots and dots or dot and dash) is equal to that of the dot, b) the duration of long light (dash) is three times that of the dot; c) the duration of darkness between two adjacent Morse codes is 8 to 12s. 4.1.4 The effective luminous intensity of each main lamp shall not be less than 1200cd, and the beam angle width shall not be less than 2.5° between two points of 10% of the maximum luminous intensity on the vertical plane luminous intensity distribution curve. 4.1.5 The main lamp shall remain on from 15 minutes before sunset to sunrise, and at other times when the atmospheric visibility in any direction is not greater than 2nmile.
Approved by the State Administration of Quality and Technical Supervision on May 18, 1998, and implemented from February to January 1999
GB17380-1998
4.1.6 All buildings (structures) shall be equipped with a backup light system. When the main light fails, the backup light system automatically starts working. The power supply of this system, which is independent of the main light, shall be able to work continuously for at least 96 hours; the performance and installation requirements of the backup light shall be consistent with those of the main light. 4.1.7 In special circumstances, when the platform height of a permanent building (structure) makes it impossible to install the main light below 30m above the average high tide level, the installation height may be appropriately increased with the approval of the navigation aids management authority in the sea area. In this case, the beam axis shall be aligned with the ground plane. 4.1.8 An alarm system shall be installed in the main control room of the building (structure) to warn the operator when the main light fails. 4.2 Auxiliary lights
4.2.1 Flashing red auxiliary lights shall be installed around the building (structure). The location and method of installing each auxiliary lamp should be able to clearly mark the horizontal edges of the building (structure), unless these edges have been clearly marked by the main lamp. 4.2.2 Each auxiliary lamp should emit light with the largest possible beam arc in the horizontal direction of its position, and the range should not be less than 3nmile. 4.2.3 The flash characteristics of the auxiliary lamp should be the same as the main lamp, and the auxiliary lamps should work synchronously. 4.2.4 The effective luminous intensity of each auxiliary lamp should not be less than 15cd, and the beam angle width should not be less than 2.5° between the two points of 10% of the maximum luminous intensity on the vertical plane luminous intensity distribution curve. 4.2.5 The auxiliary lamp should remain on from 15 minutes before sunset to sunrise. 4.3 Fog Signal
The competent authority for buildings (structures) may implement the requirements of each clause in this article according to specific circumstances. 4.3.1 One or more synchronous foghorns shall be installed on the building (structure). The foghorn sounder shall be installed between 12 and 35 meters above the average high tide level at the location where it is located, and ensure that its normal hearing range is not less than 2 nmi in any direction. 4.3.2 The sound characteristics of the foghorn shall meet the requirements of Morse code U (··一). Its characteristics are as follows: Sounding
4.3.3 When the atmospheric visibility in any direction is less than 2 nmi, the foghorn shall automatically start to sound. 4.3.4 A backup foghorn system must be equipped on the building (structure). The normal hearing range of the sounder of this system in any direction shall not be less than 0.5 nmi; when the main foghorn is completely damaged or its normal hearing range in any direction is less than 0.5 nmi due to partial failure, the backup foghorn system independent of the main foghorn shall be able to start automatically. 4.3.5 Both the main foghorn and the backup foghorn systems should work independently for at least 96 hours without using the main power supply of the building (structure) and at full load.
4.3.6 An alarm system should be installed in the main control room of the building (structure) to alert the operator when the foghorn fails. 4.3.7 If more than one electromagnetic sounder is installed on the same building (structure), the frequency difference between the sounders should not be less than 10Hz. This requirement does not apply to sounders grouped vertically. 4.4 Signboards
Signboards indicating the registered name or code of the building (structure) should be set up on the building (structure). The signboard is a yellow base with black text and numbers not less than 1m high. The number and installation position of the signboards should ensure that at least one signboard can be seen in any direction. 4.5 Mooring equipment and buoys
4.5.1 When a building (structure) is equipped with a non-luminous buoy to indicate its mooring equipment, it shall be marked in the following manner: at least one lighted buoy shall be set at 0.1 nmi on both sides of the moored buoy distribution surface. Each lighted buoy shall determine its characteristics according to the provisions of Chapter 5 "Direction Markings" of GB4696 based on the direction of the corresponding obstacle, so as to mark the navigable waters. 4.5.2 The effective luminous intensity of the lighted buoy shall not be less than 70cd, and the range shall not be less than 5nmile. The beam angle width between the two points of 10% of the maximum luminous intensity on the luminous intensity distribution curve in the vertical plane shall not be less than 9°; if the roll angle of the buoy exceeds 9° under normal conditions, 52
shall not be less than the roll angle.
4.6 Additional marks
GB 173801998
Due to special reasons for navigation, the navigation aid administration may require additional marks to be set for buildings (structures). These marks include the following three types. bZxz.net
a) High luminous intensity lights with specific performance. b) Radar beacons with specific range and signal characteristics. c) Buoys that comply with the provisions of GB4696.
4.7 Temporary marks when all marks fail If the main system and backup system of the marks installed on the buildings (structures) all fail, temporary marks should be set up as soon as possible. The temporary marks can be set up in one of the following two ways. a) Set up luminous azimuth mark buoys around the buildings (structures), and their characteristics should comply with 4.5. b) A marking system with an independent power supply shall be installed on the building (structure), including: lights that meet the requirements of 4.1.6; fog signals that meet the requirements of 4.3.
4.8 Marking of specific buildings (structures)
When it is necessary to identify a specific building (structure), a radar beacon may be installed. Its range and characteristics shall be determined by the navigation authority according to the specific circumstances. For example, the radar beacon of a building (structure) not marked on the nautical chart shall use Morse code D (··). 53
GB17380—1998
(Appendix of Suggestions)
References
The following documents are approved and issued by the International Association of Lighthouse Authorities and are directly related to this standard. Marine buoy system
Recommendations on marking of offshore buildings (structures)Recommendations on determining the luminous intensity of marine navigation lightsRecommendations on calculating the effective intensity of rhythmic lightRecommendations on radar beacons
Recommendations on radar beacons (Lecon) in sea areas54
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