Which organization sets the standards that identify the characteristics of metals used for piping?

The correct answer is the organization that develops and publishes standards that define the properties, classifications, and specifications for various materials, including metals used in piping systems. This organization is recognized for its role in establishing industry standards that ensure materials meet certain quality and performance criteria.

ASTM, or the American Society for Testing and Materials, creates standardized testing methods and specifications that help in identifying the characteristics of metals, including their strength, durability, and corrosion resistance. These standards ensure that the materials used in piping systems are suitable for their intended use, contributing to safety and efficiency in various applications.

The other organizations have different focus areas. ISA, or the International Society of Automation, primarily addresses automation and control standards. NPS, or National Pipe Standard, refers to standards related to the nominal pipe size but does not specifically set characteristics for metals themselves. AWWA, or the American Water Works Association, focuses on standards for water supply and wastewater management, including certain types of piping but not the broader characteristics of metals used across a range of applications.