Do heat transfer fluids like those within transformers or fluid filled cables come under the regulations?
No. The oil within transformers is being used rather than stored. However, bulk tanks for storing these oils are regarded as oil in storage and will come under the requirements of the regulations unless otherwise exempt. Some transformer header tanks may come into this category if they are connected directly to the transformer by means of a ‘one way – tank to transformer’ feed pipe. If the transformer has an expansion tank (where oil leaves the tank and enters the transformer and on expansion leaves the transformer and re-enters the tank), the container is regarded as being part of the transformer with oil in use and is therefore not stored and does not come under the regulations. However, in order to minimise the risk of polluting the water environment we recommend following the requirements of the regulations where possible. Transformers in storage awaiting installation or disposal are not generally regarded as oil storage containers for the purposes of these regulations but it is go
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