IEEE P2445/D2-2018 Inspection and Assessment of Below Grade and Groundline Corrosion on Weathering Steel on Electrical Transmission and Distribution Structures
IEEE - The Institute of Electrical and Electronics Engineers@ Inc.
Scope
This standard provides requirements to: (1) help utilities identify structures that may be at a high risk for below-grade corrosion; (2) excavate and inspect the selected structures; (3) categorize the condition of structures based on corrosion degradation; (4) prioritize structures requiring additional inspection based on those findings; and (5) help identify next steps as required. This NACE/IEEE joint standard is limited to the inspection and assessment of weathering steel transmission towers@ poles@ substation structures@ and other similar structures. It does not address the specific inspection of concrete foundations@ above-grade attachment points@ or guy anchors. In addition@ this standard does not provide procedures regarding repair and/or replacement of these same types of structures. This standard addresses general and localized corrosion. This standard does not provide specific pass/fail criteria. Pass/fail criteria are often determined by structural strength considerations@ which are beyond the scope of this corrosion-related standard. Users of this standard are encouraged to develop their own specific set of pass/fail criteria based upon their particular design requirements. For the purposes of this standard@ the area of inspection is comprised of the transition zone and below-grade portion of the structure. The inspection area and depth of excavation is determined by the utility as appropriate to identify the extent of corrosion. This standard should not be used to address structures in continuous immersion environments. The definitions of many of the corrosion-related terms used in this standard can be found in NACE/ASTM(1) G193.1 Purpose??The purpose of this standard is to provide procedures for the use of common inspection practices and technology on structures below grade. The standard includes: (a) assessment of historical data to categorize inspection priority; (b) below-grade inspection and assessment to categorize structures by level of condition; (c) site-specific environmental factors and soil conditions; (d) evaluation of existing repairs; (e) assessment of foundation anchors and associated hardware; and (f) detection of stray currents. NOTE: While concrete foundations and guy anchors are not specifically addressed in this standard@ it is expected they will be addressed in future separate standards.(2) (1) ASTM International (ASTM)@ 100 Barr Harbor Drive@ West Conshohocken@ PA 19428-2959. (2) Notes in text@ tables@ and figures are given for information only and do not contain requirements needed to implement the standard