The Tokyo MoU issued a Safety Bulletin informing that there have been numerous observations by PSCOs where the “simulated blackout” testing of the Emergency Generator is demonstrated as fully functional, but during an actual power blackout, the system does not meet the requirements of SOLAS Ch. II-1, Reg. 42 / 43.
PSCOs have observed an alarming number of ships that were able to demonstrate a satisfactory test of the emergency generator utilizing a Sequence Test or RTS. In particular, when tested by opening the Main Switch Board (MSB) Bus Tie (controlled blackout), the emergency generator was unable to:
1) automatically start; or
2) provide transitional power; or
3) automatically connect to the emergency switchboard.
As such, these simulated blackout tests of the emergency generator may not meet the requirements of SOLAS Ch. II-1, Reg. 43.7, and more importantly, give ships’ engineers a false sense of readiness of the ship’s emergency systems in the case an emergency. This may endanger life, ship, and the environment.
..the Tokyo MoU stressed.
Use of “Sequence Test” or “Routine Test Switch (RTS)” for testing emergency generator
In meeting the requirements of SOLAS Chapter II-1 Regulation 42.7 / 43.7, many if not most ships, in undertaking routine testing in accordance with their preventative maintenance procedures, make use of a “Sequential test” selector and/or “Routine Test Switch” (RTS) for the testing of the emergency generator. It has been identified these simulated blackouts use a different logic than when a ‘controlled’ blackout is performed. Therefore, the actual circuits, relays, and Printed Circuit Boards when used in a real situation are not tested during routine maintenance to demonstrate SOLAS operational requirements.
- Ensure that any device such a “Sequential test” selector and/or “Routine Test Switch” (RTS), fitted to the ship for the purposes of testing the simulation blackout test are designed and wired in such a way as to use the actual circuit paths used to meet the requirements SOLAS is Chapter II-1, Reg 42.3.1.2 / 43.3.1.2, so as to test the system completely;
- Update Company Safety Management Procedure (SMS) for emergency generator test procedures to include periodic ‘Controlled blackout tests’ (i.e. not using sequence test) to ensure the actual circuit paths required by SOLAS is Chapter II-1, Reg 42.3.1.2 / 43.3.1.2, can be accomplished a safe and practical manner, while assuring functionality of the system.Example: ‘Controlled blackout’ may be accomplished by opening MCR bus-tie (aka transfer line) circuit breaker, while the switch is in normal mode, and operation switches are in auto such as to be in a sea-going state.
- Be aware that “Sequential test” selector and/or “Routine Test Switch” (RTS), may not meet the requirements of SOLAS Chapter II-1 Reg. 42.5.4 / 43.5.4 if it sends a signal to disconnect the inter-connector instead of automatically disconnecting on loss of main source of power, and do not meet Chapter II-1 Reg. 42.7 / 43.7 when not testing the complete system.
- Taking into account the information above, during routine inspections, surveys, and/or ISM audits, ensure that the emergency generator functionality is tested both by utilizing any “simulated blackout” routine/sequential test switch and a controlled a blackout. If a discrepancy is noted – i.e. test is satisfactory during simulated black out during use “test switch” but unsatisfactory during controlled blackout – then appropriate actions should be taken either through amending emergency generator test procedure or assuring test switch circuit paths allow for a full and complete test of the emergency generator.
- If modifications of routine/sequential test switch circuit paths are required to ensure proper functionality, these modifications should be approved by Classification Society / Recognized Organization. Any amendments to the emergency generator testing procedure should be documented through the ship’s safety management system and preventative maintenance system.
- Take note that electrical system design and approval is the responsibility of the cognizant Recognized Organization / Classification Society, to ensure that at a minimum the system complies with the requirements of SOLAS.
In an exclusive interview to SAFETY4SEA last year, Kubota Hideo, Tokyo MOU Secretariat confirmed that the number of ship inspections has now returned to pre-pandemic levels. The Tokyo MoU has also released more safety bulletins to raise awareness over important issues: read about the risks of lifting slings with plastic sheathing on freefall lifeboats here.
Also, click here to get informed about the risks of improperly rigged pilot ladders.
EXPLORE MORE about the emergency power supply testing here
