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ICHCA International <strong>Safe</strong>ty Panel Briefing Pamphlet No 30<br />
5.4.1.7 Whilst most liquid tank containers are fitted with a butterfly valve as the<br />
external valve, other types may be encountered including ball valves, fire<br />
safe, plug valves, gate valves, diaphragm valves etc. Also, whilst the<br />
threaded cap or blind flange represent what is fitted to the majority <strong>of</strong> tank<br />
containers intended for liquids other connections/closures may be found<br />
such as various proprietary makes <strong>of</strong> quick couplings or dry-break<br />
couplings. They are acceptable alternatives on dangerous goods tank<br />
containers if they will totally prevent liquid flow when closed.<br />
5.4.2 Remote Operating Devices<br />
5.4.2.1 When three shut <strong>of</strong> devices are required<br />
the first (foot valve) must be fitted with a<br />
remote operating device. This device<br />
consists <strong>of</strong> steel cable, <strong>of</strong>ten plastic<br />
coated stainless steel, or a rod which<br />
leads from the foot valve along one side <strong>of</strong><br />
the container (arrowed in Picture 34).<br />
Should there be an incident where the<br />
loading / discharge process should be<br />
halted, then the steel wire is pulled hard.<br />
The action <strong>of</strong> pulling the wire, or rod, will<br />
lift the foot valve operating handle over the<br />
cam position snapping the valve closed.<br />
Picture 34<br />
Picture 35 Picture 36<br />
5.4.2.2 Picture 36 shows a second example <strong>of</strong> a spring loaded grab handle fitted<br />
behind the top access ladder that can be used to remotely close the foot<br />
valve. Picture 35 shows the connection <strong>of</strong> the remote operating cable to the<br />
foot valve.<br />
5.4.2.3 The international dangerous goods regulations have not always required<br />
tank containers to be fitted with a remote closure. It only became<br />
compulsory to fit them on tank containers constructed from around 2001 –<br />
2002 onwards, i.e. second generation UN portable tanks. There may be first<br />
generation tank containers constructed in the last century still in service<br />
without remote closures. There is no requirement in the international<br />
regulations for these older tank containers to be retro-fitted with them.<br />
Page 16 ©ICHCA International Limited