Hazardous Installations Directorate (HID)

HID’s internal instructions & guidance are arranged in a set of permanent manuals & two series of circulars:

HID permanent manuals are classified under:

• Enforcement (permanent)
• Permissioning (permanent)
• Technica (permanent)l

HID semi-permanent circulars (SPCs) are arranged under the same headings:

• Enforcement (semi-permanent)
• Permissioning (semi-permanent)
• Technical (semi-permanent)

• HID short life circulars (SLCs)
• Discipline information notes (DINs)
• Back to Operational Index