The Indian Standard IS 2713 Part 1-3 (1980) delineates the criteria for tubular steel poles employed in overhead electrical power lines, emphasizing steel with a minimum tensile strength of 540 MPa. This code details the design, dimensional standards, mechanical and chemical testing, manufacturing procedures, and load-bearing capacities of swaged and stepped tubular poles, serving as a vital reference for professionals engaged in power transmission infrastructure.
Overview
The Indian Standard IS 2713 Part 1-3 (1980) delineates the criteria for tubular steel poles employed in overhead electrical power lines, emphasizing steel with a minimum tensile strength of 540 MPa. This code details the design, dimensional standards, mechanical and chemical testing, manufacturing procedures, and load-bearing capacities of swaged and stepped tubular poles, serving as a vital reference for professionals engaged in power transmission infrastructure.
Audience
Contents
Structure
This section defines the coverage of IS 2713 Parts 1-3 relating to tubular steel swaged poles, including detailed specifications on dimensions, structural parameters, and loading considerations. It highlights wind load calculations based on a pressure of 1000 N/m² and the division of poles into top, middle, and bottom sections with specified diameters and thicknesses.
Outlines the properties of steel required, including density assumptions and tube joint lengths correlating to tube diameters. Chemical composition requirements refer to specified clauses and emphasize compliance with IS 1387-1967. The section also explains weight calculation formulas and joint length standards ensuring structural soundness.
Details the prescribed joint lengths aligned with tube diameters and key structural properties such as effective length, section modulus, and moment of inertia. It reiterates chemical composition considerations and presents visual diagrams for joint length selection to assist in manufacturing consistency.
Specifies dimensional data and structural parameters for tubular steel swaged poles including section moduli, moments of inertia, and cross-sectional areas. It includes formulas for calculating wind loads and presents sample tables illustrating these properties for various pole designations.
Covers mechanical evaluation methods such as permanent set and deflection tests, referencing specific clauses. It provides tables for effective length, section modulus, and related wind loads, and outlines testing sequences to verify pole resilience under applied loads.
Specifies the permissible limits for phosphorus and sulphur content in steel, testing standards applied, and the necessity of chemical analysis prior to manufacturing. It reinforces the importance of chemical quality to avoid brittleness and ensure weldability.
Describes calculation of equivalent wind loads on poles and conductors, detailing parameters such as wind pressure and pole dimensions. Includes excerpts from tables listing sectional properties relevant to load determination and explains variables used in design computations.
Explains the application of safety factors on crippling and breaking loads to derive working loads for pole selection. The section provides formulas and tables to guide users in calculating safe load limits in compliance with electrical regulations.
Details joint length specifications relative to tube diameters, chamfering requirements for swaging, and welding quality standards. It emphasizes defect-free welds and structural adequacy, supported by diagrams illustrating joint preparation and assembly.
Discusses thickness tolerance based on thickness-to-diameter ratios and outlines typical straightness expectations for tubular poles. It highlights the impact of surface finish on durability and the importance of maintaining pole straightness for stability.
Provides guidance on embedding depth, load application points, and wind load considerations for installation. It includes key parameters such as overall pole height, sectional dimensions, and load limits to ensure safe and stable placement.
Describes sampling protocols for mechanical and chemical tests based on lot size as per IS 4711-1974. It summarizes permissible chemical content limits and references tables for mechanical property verification, ensuring representative testing and compliance.
Specifies maximum allowable temporary deflection and permanent set limits during load testing, with procedural details for deflection measurement. It includes relevant formulas and diagrams illustrating the testing sequence to confirm pole performance.
Outlines mandatory markings on poles including designation, manufacturer ID, and year of production, with optional ISI certification marks. Details on hole sizes, set screws, and base plate dimensions are provided to ensure traceability and quality assurance.
Contains supplementary tables and annexures, though detailed content is not provided in the available summary.
Frequently Asked
IS 2713 Part 1-3 mandates a minimum tensile strength of 540 MPa (approximately 55 kgf/mm²) for steel utilized in tubular poles covered under Part III. This exceeds the 410 MPa requirement specified for Part II poles, ensuring enhanced strength and ductility for structural applications.
Mechanical and chemical testing under IS 2713 Part 1-3 involves sampling tubes according to IS 4711-1974 standards to obtain representative specimens. Mechanical tests include tensile strength, deflection, and permanent set assessments, while chemical tests focus on sulfur and phosphorus content, verifying material quality and weldability.
The standard specifies detailed dimensions such as length, sectional diameters, and thicknesses, along with structural properties including section modulus, moment of inertia, and cross-sectional area. These parameters vary by pole designation and are tabulated to guide design and manufacturing, though full detailed tables are referenced in the code.
Working load is calculated by applying safety factors to either the crippling or breaking load, commonly 2.0 and 2.5 respectively, as per electrical rules. The working load equals the breaking or crippling load divided by the factor of safety, ensuring poles are selected with adequate safety margins.
Manufacturing involves swaging via mechanical processes, requiring chamfering the upper joint edge at about 45°, unless a circumferential weld is applied instead. Welding must comply with quality and inspection criteria to ensure joint integrity and structural performance of the poles.
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