Can’t Make Sense of Flange Pressure Ratings? Learn PN and Class in 5 Minutes – Avoid Mistakes in Selection!

2026-05-15

When selecting flanges for a piping system, getting the material right but the pressure rating wrong can still lead to serious safety accidents. Lihuá Titanium not only provides high-quality titanium flanges but also hopes to help you make accurate selections.

Today, Lihuá Titanium will help you fully understand flange pressure ratings.

PART.01
What is a flange pressure rating?

The pressure rating is the flange’s “pressure ID card,” indicating the maximum safe pressure it can withstand.

Key point: For the same flange, as the temperature rises, the maximum allowable pressure decreases.

PART.02
Two main standard systems: PN vs Class

1. European/Chinese standards (PN)

– Standards: DIN / EN / GB (Chinese national standards)
– Common ratings: PN6, PN10, PN16, PN25, PN40, PN100, PN160, PN250, etc.

2. American standards (Class)

– Standards: ASME / ANSI
– Common ratings: Class 150, Class 300, Class 600, Class 1500, Class 2500.

PART.03
Key selection points

1. Three core factors for selection:

– Maximum system pressure
– Maximum system temperature
– Medium inside the pipe

2. Common selection mistake:

❌ Considering only pressure and ignoring temperature
✅ Both pressure and temperature must be considered together

⚠️ Important reminder: Based on the design temperature, design pressure, and flange material, you must consult the corresponding pressure-temperature rating table to determine the flange’s maximum allowable working pressure under the operating conditions.

PART.04
Professional advice from Lihuá Titanium

Clarify the standard system: Chinese/European standard (PN) or American standard (Class) – this determines the flange’s dimensions and pressure rating marking.
Provide accurate operating conditions: flange type, sealing face type, nominal pressure, design temperature, medium, etc.
Safety first: When unsure, it is better to choose a higher pressure rating to ensure an adequate safety margin.

Each titanium flange provided by Lihuá Titanium is not only reliable in material but also strictly manufactured in 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.

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As a regulated industrial enterprise above designated size in Shaanxi Province and a “Specialized and Sophisticated” enterprise, Lihuá Titanium has focused on titanium flanges for 20 years and has helped over 5,000 companies solve corrosion problems in their industries. For more information, please follow the WeChat public account “Lihuá Titanium” and leave your company name and contact details. We will provide you with professional anti-corrosion solutions.

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Can’t Make Sense of Flange Pressure Ratings? Learn PN and Class in 5 Minutes – Avoid Mistakes in Selection!

Can’t Make Sense of Flange Pressure Ratings? Learn PN and Class in 5 Minutes – Avoid Mistakes in Selection!