ISO 9330-2:1997

Overview

ISO 9330-2:1997 specifies the technical delivery conditions for electric resistance and induction welded circular steel tubes intended for pressure purposes at elevated temperatures. This part of the standard details requirements for unalloyed and alloyed welded steel tubes with wall thicknesses up to 16 mm, focusing on properties needed for applications such as steam generating equipment and interconnecting pipework. As a partial revision of ISO 2604-3:1975, this standard aligns with modern manufacturing and safety practices for steel tubes used in demanding, high-temperature environments.

Key Topics

• Scope and Coverage
  • Applies to welded (ERW and induction) steel tubes of circular cross-section
  • Covers wall thicknesses up to and including 16 mm
  • Addresses both unalloyed and alloyed steels with specified elevated temperature properties
• Technical Delivery Conditions
  • Outlines manufacturing processes, heat treatment, and product analysis
  • Defines chemical composition and mechanical property requirements at both room and elevated temperatures
  • Lays out tolerances on dimensions, wall thickness, ovality, and straightness
  • Specifies technical documentation and marking
• Inspection and Testing
  • Details mandatory tests: tensile, flattening/bend, drift/ring expanding, and non-destructive testing
  • Describes batch sampling, certification, and inspection procedures
  • Includes requirements for leak tightness and thorough visual examination
• Purchaser Information
  • Lists mandatory and optional information the purchaser must supply when ordering, including size, grade, delivery condition, and inspection needs
  • Provides sample ordering specification

Applications

ISO 9330-2:1997 is crucial for industries where reliable steel tubing is required to withstand internal pressure and elevated temperatures. Typical applications include:

• Steam Generating Equipment: Widely used in power plants and industrial boilers, where tubes must maintain integrity under pressure and high heat.
• Interconnecting Pipework: Suitable for connecting sections of plant or equipment handling hot gases or fluids.
• Chemical and Petrochemical Installations: Ideal for systems where safe, pressure-retaining pipework is critical due to process temperatures.
• Mechanical Engineering: Used where elevated temperature resistance and specified mechanical properties of tubes are essential for the safety and efficiency of engineered systems.

Manufacturers, suppliers, and purchasers benefit from clear guidelines ensuring consistent, safe, and interoperable components. By adhering to these requirements, organizations can demonstrate compliance with international best practices and relevant safety regulations.

Related Standards

For comprehensive implementation, ISO 9330-2:1997 should be considered alongside related standards, such as:

• ISO 9330-1 - Unalloyed steel tubes with specified room temperature properties
• ISO 9330-3 - Electric resistance and induction welded tubes with specified low temperature properties
• ISO 4200 - General tables of dimensions and masses for steel tubes
• ISO 10474 - Inspection documents for steel and steel products
• ISO 1129 - Dimensions and tolerances for tubes used in boilers, superheaters, and heat exchangers
• ISO 404 - General technical delivery requirements for steel and steel products

These standards provide a broader context and support for the technical, dimensional, and quality-related aspects involved in the specification, supply, and inspection of welded steel tubes for pressure purposes.

Keywords: ISO 9330-2, welded steel tubes, pressure purposes, elevated temperature properties, electric resistance welded, induction welded, technical delivery conditions, steam generating equipment, industrial pipework, steel tube inspection, mechanical properties, international standardization.