M
- M
- Main Earthing Terminal (MET)
- Maintainability (IEV 191-02-07)
- Maintenance
- Major Accident Hazard
- Malware
- Man-in-the-Middle Attack
- Management of Change
- Management System
- Manhole/Manway
- Manifold (Production)
- Manufacturer / Supplier
- Manufacturing Procedure Specification
- Maximum Allowable Differential Pressure
- Maximum Allowable Pressure (Art. 1, 2.3)
- Maximum Allowable Speed
- Maximum Allowable Temperature
- Maximum Allowable Vacuum
- Maximum Allowable Working Pressure
- Maximum Continuous Speed
- Maximum Discharge Pressure
- Maximum Sealing Pressure
- Maximum Surface Temperature
- May
- Mean Time Between Failures (MTBF) (IEV 191-12-09)
- Mean Time to Failure (MTTF) (IEV 191-12-07)
- Mean Time to Repair (MTTR) (IEV 191-13-08)
- Measurement Uncertainty / Overall Analyser Uncertainty
- Measuring Distance
- Measuring Surface
- Measuring Surface Zone
- Mechanical Shoe Seal
- Metal Seated Plug Valve
- Method Statement
- Mimic
- Minimum Allowable Speed
- Minimum Allowable Temperature
- Minimum Continuous Stable Flow
- Minimum Continuous Thermal Flow
- Mistake/Human Error (IEV 191-05-25)
- Mitigation
- Mound
- Multi-Stream Systems