O
- Glossary
- Glossary
- Glossary
- Glossary
- Glossary
- Glossary
- Glossary
- Glossary
- O
- Obturator
- Octave Bands
- On-Stream
- On-Stream Examination
- Operating Procedure
- Operations Authority
- Operator
- Operator Response Time
- Out of Commission
- Out of Service
- Overall Time Lag
- Overpressure (with respect to Safety Valves)
- Override, Bypass, Inhibit
- Owner
- Oxidising Chemical