Definitions Flashcards
ARC BURN
A localized condition or deposit that is caused by an electric arc and consists of remelted metal, heat-affected metal, a change in the surface profile, or a combination thereof.
WRINKLE BEND
Pipe bend produced by a field machine or controlled process that may result in prominent contour discontinuities on the inner radius. The wrinkle is deliberately introduced as a means of shortening the inside meridian of the bend
YEILD STRENGTH
The stress at which a material exhibits the specified limiting offset or specified total elongation under load in a tensile test as prescribe by the specification or standard
WATER CROSSING
The crossing by an onshore pipeline of a bay,lake,river,or major stream
TOLERANCE ZONE
The space in which a line or facility is located and in which special care is to be taken
TRACEABILITY
Ability to trace the history, application or location of an object (regarding a product or service, can relate to the origin of material and parts,processing history, distribution and location after delivery)
STATIONING
A measure of length used to identify locations along the pipeline which provides a geospatial reference for pipeline features and construction. Stationing is typically measured in feet, usually indicated as X+XX. Generally, the beginning of the pipeline route is designated as zero and station values increase along the route. Some operators use mile posts as a method of stationing
ROW
Strip of land on which utilities and similar facilities are constructed in which a pipeline company and landowner both have a legal interest
ROOT BEAD
First or stringer bead that initially joins two sections of pipe, a section of pipe to a fitting or two fittings
SEAM
The longitudinal or spiral weld in fabricated line pipe.
PITTING
Localized corrosion of a metal surface that is confined to a small area and takes the form of cavities called pits.
POLARIZATION
The change from the open-circuit potential as a result of current across the electrode/electrolyte interface
MITER
Two or more straight sections of pipe matched and joined on a line bisecting the angle of junction so as to produce a change in direction
NEAR MISS
An event where damage did not occur, but a clear potential for damage was identified
NOBLE
The positive direction of electrode potential, thus resembling noble metals such as gold and platinum
NOMINAL PIPE SIZE (NPS)
A dimensionless abbreviation followed by the numerical portion of the previously used inch nominal size of the matching
CERCLA
Comprehensive Environmental Response, Compensation and Liability Act
FWPCA/CLEAN WATER ACT
Federal Water Pollution Control Act
HB
Hollow bead porosity
NPDES
National Pollution Discharge Elimination System
PEL
Permissible Exposure limit
SHIELDED METAL ARC WELDING (SMAW)
An arc welding process with an arc between a covered electrode and the weld pool.
SHIELDING
Preventing or diverting the flow of cathodic protection current from its natural path
REWORK
REWORK (WELDING)
Action on a nonconforming product or service to maki it conform to the requirements.
During the welding or after the weld has been completed, the removal of an imperfection that requires grinding and/or welding that is performed prior to visual or non-destructive testing of a completed weld(not repair).
RIPPLE
A permanent localized deformation of a pipe wall characterized by several alternating low amplitude inward/outward lobes
RUPTURE
A complete failure of any portion of the pipeline that allows the product to escape to the environment.
SEAM
SEAM WELD
The longitudinal or spiral weld in fabricated line pipe
Longitudinal or helical weld in pipe
