Schedule 3 of the Pipelines Safety Regulations (Northern Ireland) SR 1997/193 sets out the requirements for emergency shut-down valves.

The requirements are as follows:

• an emergency shut-down valve must be incorporated in the riser of a pipeline:
  • in a position in which it can be safely inspected, maintained and tested, and
  • so far as this is consistent with the sub-paragraph above, as far down the riser as is reasonably practicable;

and such a valve must comply with the following requirements;

• an emergency shut-down valve must be held open by an electrical, hydraulic or other signal to the mechanism for actuating...

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