本帖最后由 江海直达 于 2017-9-14 17:04 编辑
IMO Resolution: alert code A.1021 (26)
6.6. On mobile offshore drilling units (MODUs), where supplemental visual indicators are installed for general emergency alarms, the colour of these supplemental indicators may be amber, provided they flash with a pulse frequency of at least 4 Hz.
5.9. The general emergency alarm, fire alarm (if not incorporated in the general emergency alarm system), fire-extinguishing medium alarm and machinery alarm should be so arranged that the failure of the power supply or the signal-generating and amplifying equipment (if any) to one will not affect the performance of the others. Where common audible signals and call devices are installed in accordance with 5.1, arrangements should be provided to minimize the effect of such devices’ failure.
5.10. The performance standards and functional requirements of the general emergency alarm are specified in the LSA Code, chapter VII, section 7.2[/url]. In addition, the sound pressure level should be in the 1/3-octave band about the fundamental frequency. In no case should the level of an audible signal in a space exceed 120 dB(A).
5.11. With the exception of bells, audible signals should have a signal frequency between 200 Hz and 2,500 Hz.
5.12. For the audible presentation of alerts on the navigation bridge, the requirements of resolution MSC.191(79)[/url], MSC/Circ.982, resolution A.694(17) resolution MSC.252(83)[/url] where applicable to ships with Integrated Navigation Systems (INS), and, where fitted, the requirements of a bridge alert management system, should be observed.
5.13. For the audible presentation of navigational alerts on the bridge the sound pressure should be at least 75 dB(A) but not greater than 85 dB(A) at a distance of one metre from the systems. Alternatively, it may be allowed to adjust the sound pressure to at least 10 dB(A) above the ambient noise level instead, if the ambient sound pressure on the bridge can be determined. The upper noise level should not exceed 85 dB(A).
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