R&D (Research and Development)
Radiation Protection Instrument
Radiation Therapy (or Radiotherapy)
Radio Frequency Interference (RFI)
Radioactive Decay (Disintegration)
RAM (Reliability, Availability and Maintainability) Study
Rate of Reaction (or Reaction Rate)
RCM (Reliability Centred Maintenance)
RE 100 (Renewable 100 Percent)
Reactive Power (Volt-Ampere Reactive (VAR))
Reclamation
Recognized and Generally Accepted Good Engineering Practice (RAGAGEP)
Reformulated Gasoline Blendstock for oxygenate Blending (RBOB)
Regenerative or Reverse Fuel Cell (RFC)
Regional Comprehensive Economic Partnership (RCEP)
Regionalisation (or Regionalization)
Regulation: Cost of Service (RCS)
Regulation: Social and Political (RSP)
Reinforced Concrete Specification
Relative Density (or Specific Gravity)
Relief and Safety Device Index
Remotely Operated Shut-Off Valve (ROSOV)
Removal and Abandonment (R & A)
Renewable Portfolio Standard (RPS)
Requisitions for Structural Steelwork
Residence Time (or Retention Time)
Residential Energy Services Network (RESNET)
Resource Constrained Scheduling
Respiratory Protective Equipment (RPE)
Respiratory Tract (or Respiratory System)
Responsibility Assignment Matrix (RAM)
Restricted Area (Controlled Area)
RFID (Radio Frequency Identification)
Risk Based Process Safety (RBPS)
Risk Classification (or Risk Response)
Risk Management Program (RMP) Rule
ROM (Reliability Operability Maintenance)