U
- U
- UK Offshore Operators Association
- Ultraviolet Protection
- Umbilicals
- Unaccepted
- Uncertainty (ASTM E456)
- Uncertainty Component (ASTM E456)
- Undetected Fault
- Uni-directional Valve
- United Kingdom Accreditation Service
- Universal Serial Bus
- UOE
- Upper Control Limit (ASTM E456)
- Upper Flammable Limit
- Upper Warning Limit
- Upstream Seated Valve
- User Inspectorate (Art. 14)