Technical specifications of the ASTM A688 / A688M standard
The ASTM A688 / A688M standard governs the production of high-quality seamless and welded austenitic tubes of small diameter, designed for use in feedwater heater systems. EV Group China supplies metal products that fully comply with these specifications, including specialized U-bend configurations for heat exchange equipment.
Scope of application and dimensions
This specification covers tubular products with the following geometric parameters:
- Outside diameter: from 5/8 to 1 inch (15.9–25.4 mm).
- Wall thickness: 0.028 inches (0.7 mm) and above.
EV Group China ensures strict control over tolerance compliance for both average and minimum wall thickness, which is critical for the reliable operation of feedwater heaters.
Standardization of measurement units
The document uses two independent systems: inch-pound and SI units. According to the standard requirements, the values in each system are independent and are not subject to direct conversion. The EV Group China engineering department recommends specifying the preferred measurement system when ordering products to ensure full compliance with project documentation.