The main differences between standard and non-standard flanges are as follows:
Production Standards:
Standard flanges: Manufactured in accordance with the People's Republic of China National Standard GB/T 9112~9124-2010 Steel Pipe Flanges, strictly adhering to dimensional tolerances.
Non-standard flanges: Do not comply with the above national standard, potentially resulting in inaccurate dimensions.
Material Quality:
Standard flanges: Manufactured using high-quality materials that meet national standards.
Non-standard flanges: May use inferior materials, affecting overall product quality and safety.
Pressure Rating:
Standard flanges: Have clearly defined PN pressure ratings, such as PN2.5 to PN400, and Class ratings, such as Class 150 to Class 2500, meeting the needs of different application scenarios.
Non-standard flanges: May not have a clearly defined pressure rating or marking, potentially posing safety hazards during use.
Application Scenarios:
Standard flanges: Widely used in various industrial fields requiring strict adherence to national standards, such as petroleum, chemical, and power industries.
Non-standard flanges: These are typically used in situations where flange requirements are not high, but they pose significant safety hazards and quality risks.
