Corrosion Doctors site map Corrosion information hub: The Corrosion Doctor's Web site Corrosion engineering consultant



Site index

A to Z listing



Corrosion glossary


Famous scientists

Corrosion course

Distance Ed

Doomsday scenarios



Monitoring glossary

Photo gallery

Rare earths

Search this site

Textbook assignments

Toxic elements

Water glossary



[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]

Corrosion Monitoring & Inspection Glossary - R

  • Radius Bends: The radius of the bend in the pipe as related to the pipe diameter (D). Example: A 3D bend would have a radius of three times the diameter of the pipe measured to the centerline of the pipe.

  • Real-Time Measurements: Refers to measurements that can detect changes in the parameter under investigation essentially as they occur. The changes can be detected because the technique is sufficiently sensitive, and can be made continuously or with sufficient frequency to follow the changes in the parameter.

    Receiver: A pipeline facility used for removing a pig from a pressurized pipeline, may be referred to as trap.

    Recognizable: Producing a signal that can be identified as coming from a particular type of defect, e.g., mechanical damage.

  • Remanent Magnetization: The magnetization level left in a steel pipe after the passage of a magnetic in-line inspection tool.

  • Remediation: An operation or procedure that eliminates the factor or factors causing an imperfection, defect, or critical defect.

  • Remnant Magnetization: The magnetization level left in a steel pipe after the passage of a magnetic in-line inspection tool.

  • Rerounding: The process of changing the dent depth and shape by internal pressure in the pipe. Generally, dents due to third-party contact will reround, while dents due to rocks will not unless the rock causing the dent is removed.

  • Residual Stress: Stress present in an object in the absence of any external loading; results from manufacturing process, heat treatment, or mechanical working of material.

  • RSTRENG: RSTRENG is the preferred technology for determining the remaining strength of externally corroded pipe, as it is less conservative than ASME B31G and provides a more accurate assessment of the corroded area. This results in enhanced pipeline integrity and safety while simultaneously lowering costs to the pipeline owner/operator.

  • RESTRENG 2: An enhanced version of RSTRENG as specified in the American Gas Association project report AGA-PR-218-9205.18

  • RSTRENG 3: A computer program designed to calculate the residual strength or failure pressure of corroded pipe.

  • Reynolds number (Re): A dimensionless number describing the flow of fluid in a pipe, derived from Re=(pvd)/1 or (vd)/v where p = density of fluid v = velocity of fluid d = diameter of pipe rl = dynamic viscosity v = kinematic viscosity.

  • Rupture: The instantaneous tearing or fracturing of pipe material causing large-scale product loss and immediately impairing the operation of the pipeline.

  • Rupture Pressure Ratio (RPR): The ratio of the predicted burst pressure calculated by an analysis criterion (e.g., ASME(Z) B 31 G,5 RSTRENG 3 etc.) to the pressure at specified minimum yield strength (SMYS).

Corrosion Inspection and Monitoring