Miscelleneous

What is IMO performance standard requirements for BNWAS?

IMO performance standard for BNWAS are as follows:

Operational modes

The BNWAS shall incorporate the following operational modes:

  • Automatic (Automatically brought into operation whenever the ship’s heading or track control system is activated and inhibited when this system is not activated)
  • Manual ON (In operation constantly)
  • Manual OFF (Does not operate under any circumstances)
  • Operational sequence of indications and alarms
Dormant period

Once operational, the alarm system shall remain dormant for a period of between 3 and 12 min (Td). At the end of this dormant period, the alarm system shall initiate a visual indication on the bridge.

BNWAS

Figure:   Alarm  Sequence Without  Acknowledgements.
First stage alarm

If not reset, the BNWAS shall additionally sound a first stage audible alarm on the bridge 15 s after the visual indication is initiated.

Second stage alarm

If not reset, the BNWAS shall additionally sound a second stage remote audible alarm in the back-up officer’s and/or Master’s location 15 s after the first stage audible alarm is initiated.

Third stage alarm

If not reset, the BNWAS shall additionally sound a third stage remote audible alarm at the locations of further crew members capable of taking corrective actions 90 s after the second stage remote audible alarm is initiated.

Alarm alternatives

In vessels other than passenger vessels, the second or third stage remote audible alarms may sound in all the above locations at the same time. If the second stage audible alarm is sounded in this way, the third stage alarm may be omitted.

In larger vessels, the delay between the second and third stage alarms may be set to a longer value on installation, up to a maximum of 3 min, to allow sufficient time for the back-up officer and/or Master to reach the bridge.

Facilities shall be provided to inhibit the third stage alarm and to increase the delay between the second and third stage alarms to 3 min.

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Amit Sharma

Graduated from M.E.R.I. Mumbai (Mumbai University), After a brief sailing founded this website with the idea to bring the maritime education online which must be free and available for all at all times and to find basic solutions that are of extreme importance to a seafarer by our innovative ideas.

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