P
- P
- Pantograph Seal
- Parallel Slide Valve
- Parallel Tread
- Peaking
- PEEK (polyetheretherketone)
- Performance Action Limit
- Permit-To-Work (PTW)
- PFD (average)
- PFEER
- Phishers
- Physical Screen
- Pipe Mill
- Pipe Support – Examples: Rigid Support, Rigid Hanger, Rod, Sliding, Foot, Pad, Anchor, Stanchion
- Pipeline
- Pipework
- Piping and Instrumentation Diagram
- Planned Maintenance
- Plant
- Plant Operating Period
- Plate Mill
- Platform
- Pontoon
- Precision (ASTM E456)
- Pressure Accessories (Art. 1, 2.1.4)
- Pressure Casing
- Pressure Equipment Directive
- Pressure Equipment Regulations
- Pressure System
- Pressure Systems Safety Regulations
- Pressure Test – Examples: Hydrostatic Test
- Presumption of Conformity (Art. 5)
- Preventive or Proactive Maintenance
- Primary Barrier
- Primary Containment Envelope
- Primary Seal
- Primary Structure
- Primary Wind Girder
- Prior use
- Prioritisation
- Probability of Failure
- Probability of Failure on Demand (PFD)
- Probe
- Process Lag
- Process Safety Time
- Product
- Product Process Plant
- Programmable Electronic System
- Programmable Logic Controller
- Prompt
- Proof Pressure test
- Proof Stress Designed Pressure Equipment
- Proof Testing
- Property
- Protective Barrier
- Protective Conductor
- Protective Extra-Low Voltage (PELV)
- Purchaser
- Purchaser’s Inspection Engineer
- PV Valve