R
RA Righting Arm (of a ship hull)
RACH Reliability Assessment for Containment of Hazardous Materials UK/Norway research project
RADAR  Riser Active Data Acquisition Recorder 
RAI Redundant Analogue Input
RAM Reliability, Availability, Maintainability (analysis)
RAO Response Amplitude Operator
RATC Recallable Available Transmission Capability
RBI  Risk Based Inspection
RCCB Residual Current Circuit Breaker
RCSSMRS Regional Centre for Services in Surveying, Mapping and Remote Sensing  
RCU Remote Control Unit
RD  flame Detector
RDEW  Early Warning Detector of smoke
RDFP  Fusible Plug
RDH  Heat Detector ­ thermostatic
RDHR  Heat rate of Rise Detector
RDIR Infra Red flame Detector
RDIS  Ionic Smoke Detector
RDOS  Optical Smoke Detector
RDS  Smoke Detector
RDUI  UV/IR flame Detector
RDUV  UV/UV flame Detector
Re Reynold number (experimental number used in fluid flow to predict the flow velocity at which turbulence will occur)
RE Righting Energy (of a ship hull)
REMPEC  Regional Marine Pollution Emergency Response Centre, Malta (Mediterranean)
REMPEITC Regional Marine Pollution Emergency, Information and Training Centre - Wider Caribbean
REP Risk Evaluation & Profiling
RF Raised Face
Radio Frequency
RFC Ready For Commissioning
RFD Fire Damper
RFH  Ready for Handover
RFO  Ready For Operation
RFP  Request for Proposal 
RFSU  Ready For Start-Up
RFT  Repeat Formation Tester
RGD Rapid Gas Decompression 
RGIT  Royal Gordon Institute of Technology
RGPS  Relative Global Positioning System
RGPFV  (electric cable) 
RH  Relative Humidity 
RHI  Rigid Hull Inflatable
RHS  Fire Push Button 
RIA  Robotics Industries Association (USA) www.website 
RIN Real-time Information Network
RINEX  Receiver Independent Exchange Format 
RJ  Ring Joint 
RK  Fire audible alarm 
RL  Fire visual alarm 
Return Loss
RLS Repulsive Least Squares (algorythm)
R&LE  Repair & Lifetime Extension 
RMAC  Manual Alarm Call point  
RMO Rules for (planning and execution of) Marine Operations 
RMP Risk Management Program
RMR  Riserless Mud Recovery 
RMS Root Mean Square 
RNLI  Royal National Lifeboat Institute (UK) 
ROBLINK Long Range Shallow Water ROBust Acoustic Communication LINKs
ROCC Regional Oil Combating Centre
ROCE Return On (average) Capital Employed
ROCRAM  Operative Network of Regional Co-operation among the Maritime Authorities of South America, Cuba, Mexico and Panama
ROCRAM-CA Regional Co-operation on Maritime Matters (covers Central America and the Dominican Republic) see ROCRAM
RODC Regional Oceanographic Data Centre  
RODS  Reliable Operation of Downhole Systems UK/Norway research project
ROE Returne On (average) Equity
ROIC Return On Invested Capital
ROP  Rate Of Penetration 
ROPME Regional Organisation for the Protection of the Marine Environment (Arabian Gulf)
ROR  Rate Of Rise 
ROT  Remote Operated Tool  
ROV  Remote Operated Vehicle 
ROW  Right Of Way 
RP  Responsible Party
RPC  Remote Power Controller
RPE  Registered professional Engineer
RPM  Rotation Per Minute 
Relative Permeability Modifier
  Reservoir Performance Monitoring
RPS  Riser Protection Structure
RQD  Rock Quality Designation of Rock Core
RRF  Risk Reduction Factor 
RRT Regional Response Team 
RSAHC ROPME Sea Area Hydrographic Commission  www.webpage
RSC Residual Stress Control
RSDP  Reduced Surface Demand Package 
RSES Responsible  for Safety and Environment on Site 
RSS  Rotary Steerable System 
RT  Radiographic Testing 
RTCM  Radio Technical Commission for Maritime resource 
R&T  Rods & Tubing
RTCM-
SC104
 (Recommended format for GPS in differential mode.
Differential corrections are often referred to as simply as RTCM corrections
)
RTD  Resistance Temperature Detector 
RTG Regional Transmission Group
RTDGPS  Remote Differential GPS
RTK Real-Time Kernel  (computer operating system)
RTM  Resin Transfer Moulding 
  Riser Turret Mooring
RTU Remote Telemetry Unit
  Real Time Unix (computer operating system)
RUP  Riser Utilities Platform 
R/V  Research Vessel 
RV  Retainer Valve 
RVD  Rotary Vacuum Dryer 
RVP  Reid Vapour Pressure 
RWDC Restricted Work Day Case
RWMA Resistance Welder Manufacturers Association (USA) www.website 
RXT  Reservoir Exploration Technology