Marine News
US COAST GUARD ISSUES WARNING ABOUT RELIEF VALVE TESTING ON PNEUMATIC SYSTEMS
Due to a mishap from improper testing of a vapor safety relief valve on a compressed air system, the Coast Guard Office of Commercial Vessel Compliance (CG- CVC) reminds all those concerned of the risks and best practices in conducting or witnessing the testing of relief valves. While this information is based on testing compressed air systems using vapor relief valves, the guidance is also relevant to safety valves in other pressure systems, except boilers.
In summary, Marine Inspectors should be aware of the following:
1) A Marine Inspector should not allow removal or alteration of a secondary safety device to facilitate a test of the intended safety device2;
2) All systems are different, and the attending Marine Inspector should become familiar with each system and the valve settings before testing;
3) The attending Marine Inspector is observing the test only, and the appropriate vessel representative should perform all functional tests; and
4) The attending Marine Inspector should verify that all relief valves meet the design, installation, and performance criteria in 46 CFR Subchapter F.
Mishap summary: While preparing for a test, the relief valve on the associated compressor was removed because it had a lower set-point than the relief valve on the air receiver being tested. Unfortunately, the isolation valve between the compressor and the air receiver was mistakenly left closed during the test, resulting in a dead-head situation, causing the compressor to rupture, and sending shrapnel throughout the space. Fortunately, no one was injured.
Full story: https://www.
iims.org.uk/us-coast-guard- issues-safety-bulletin-vapor- pressure-relief-valve-testing- pneumatic-systems/
REPORT ON THE LOVE FOR LYDIA CARBON MONOXIDE DEATHS TRAGEDY PUBLISHED BY MAIB
Between 7 and 9 June 2016, the two occupants of the motor cruiser Love for Lydia died from carbon monoxide poisoning. The boat was moored alongside Wroxham Island, River Bure, Norfolk, and their bodies were found during the afternoon of 9 June in the boat’s forepeak cabin.
The MAIB investigation identified that:
• The source of the carbon monoxide was exhaust fumes from the boat’s eight-cylinder petrol engine, which contained high levels of the gas even when the engine was ‘idling’.
• The engine was probably being run to charge the boat’s 12v batteries and the occupants did not recognise the danger from the exhaust fumes.
• The carbon monoxide from the ‘wet’ exhaust at the stern of the boat spread under the canvas canopy on the aft deck and then into the forepeak cabin, where it quickly reached lethal concentrations.
• The boat’s habitable spaces were not adequately ventilated; the forepeak cabin’s deck hatch and port holes were shut.
• The boat’s occupants were not alerted to the danger because a carbon monoxide alarm was not fitted.
In January 2015, the MAIB made several recommendations in an attempt to improve carbon monoxide safety on board recreational craft following its investigation into the double fatality on
board the motor cruiser Arniston on Windermere. It is disappointing that a recommendation intended to require new recreational craft to be fitted with a carbon monoxide alarm was not accepted and that the action that resulted from a recommendation aimed at providing a co- ordinated and focused awareness campaign was short-lived.
MAIB statement: The Marine Accident Investigation Branch has investigated four accidents in four years where seven people have tragically died as a result of carbon monoxide poisoning on boats. Carbon monoxide is a silent killer and there are many sources of it on boats, including engines, cookers, heaters and even barbecues.
A number of organisations continue to raise the awareness of leisure boaters to the dangers of carbon monoxide, but more needs to be done. A recommendation has been made to the Maritime and Coastguard Agency intended to re- energise various industry bodies into agreeing a co-ordinated and concerted campaign. Recommendations have also been made to the Boat Safety Scheme and British Marine which are intended to realise the mandatory fitting of carbon monoxide alarms on board new recreational craft and on board existing recreational craft using inland waterways. Marine surveyors have their part to play too and IIMS urges its members to remind vessel owners of the importance of fitting a suitable alarm.
Read the report in full:
https://www.iims.org.uk/ wp-content/uploads/2017/05/ MAIBInvReport9_2017.pdf
The Report • June 2017 • Issue 80 | 7
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