Confused About Flange Pressure Ratings? Learn PN and Class in 5 Minutes to Avoid Selection Mistakes!

When selecting flanges for a piping system, choosing the right material but the wrong pressure rating can still lead to serious safety accidents. Lihua Titanium Industry not only provides high-quality titanium flanges but also hopes you can make accurate selections. Today, Lihua Titanium Industry helps you thoroughly understand flange pressure ratings.

Pressure rating is the "pressure-bearing ID card" of a flange, representing the maximum pressure it can safely withstand. Key point: For the same flange, the higher the temperature, the lower the pressure it can withstand.

1. European Standard/National Standard (PN) Implementation standards: DIN / EN / GB (National Standard) Common ratings: PN6, PN10, PN16, PN25, PN40, PN100, PN160, PN250, etc.

2. American Standard (Class): Implementation standards: ASME / ANSI Common ratings: Class 150, Class 300, Class 600, Class 1500, Class 2500.

1. Three Core Elements for Selection

• Maximum system pressure
• Maximum system temperature
• Medium in the pipeline

2. Selection Misconceptions:

Only focusing on pressure and ignoring temperature

✅ Pressure & temperature must be considered simultaneously

⚠️ Important reminder: The maximum allowable working pressure of the flange under operating conditions must be determined by referring to the corresponding "Pressure-Temperature Rating Table" based on design temperature, design pressure and flange material.

• Clarify the standard system: National/European standard (PN) or American standard (Class), which determines the flange dimensions and pressure rating标识.
• Provide accurate working conditions: "Flange type", "Sealing surface type", "Nominal pressure", "Design temperature", "Medium", etc.
• Safety first: When in doubt, choose a higher pressure rating to ensure sufficient safety margin.

Lihua Titanium Industry provides each titanium flange that not only has reliable material but also is manufactured in strict accordance with international standards (GB, HG, ASME, DIN, JIS, etc.), ensuring that dimensions and pressure ratings fully comply with specifications, providing reliable protection for your piping system.