Steel flanges play a critical role in industrial piping systems, ensuring secure connections, leak prevention, and ease of maintenance. However, to guarantee performance and compatibility, selecting the right flange standard is essential.
Globally, the most widely adopted flange standards include ANSI (USA), JIS (Japan), DIN (Germany), and BS (UK). Each standard reflects regional industrial practices and varies in size, pressure ratings, and design.
In this article, Sunjin Metals Vina (SJM Vina) will help you clearly understand these standards and provide guidance on how to choose the appropriate one for your project or market.
1. ANSI Standard (American National Standards Institute)
Key Features:
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Uses the inch-based measurement system
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Common in the USA, Middle East, and American-standard equipment
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Pressure classes: Class 150, 300, 600, 900, 1500, 2500
Advantages:
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Ideal for high-pressure and high-temperature systems
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Widely supported with American valves and piping
Example:
In a refinery project in Saudi Arabia, engineers selected ANSI B16.5 Class 300 welding neck flanges for their ability to withstand high pressure and ensure system integrity when used with American-imported equipment.
2. JIS Standard (Japanese Industrial Standards)
Key Features:
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Based on the metric system
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Common in Japan, Vietnam, Korea, and Southeast Asia
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Pressure ratings: 5K, 10K, 16K, 20K, 30K
Advantages:
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Cost-effective, easy to find in Asian markets
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Suitable for medium-pressure applications
Example:
A food processing plant in Dong Nai, Vietnam, uses JIS 10K flanges for clean water lines—affordable, easy to source locally, and sufficient for moderate pressure needs.
3. DIN Standard (Deutsches Institut für Normung – Germany)
Key Features:
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Common in Germany and EU countries
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Pressure rating denoted as PN (Nominal Pressure): PN6, PN10, PN16, PN25, PN40, etc.
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Based on the metric system
Advantages:
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High mechanical strength and sealing performance
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Preferred in European industrial, water treatment, and food-grade systems
Example:
A European water treatment facility installs DIN PN16 slip-on flanges in medium-pressure pipelines connecting pumps and filters.
4. BS Standard (British Standard)
Key Features:
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Common in the UK and Commonwealth countries
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Often seen as BS 4504 (modern) or BS 10 (older)
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Uses metric units, pressure rated as PN
Advantages:
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Compatible with DIN flanges in some cases
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Frequently used in plumbing, gas, and utility infrastructure
Example:
A high-rise building project in Singapore applies BS PN10 flanges in the cold-water supply system for their reliability and ease of alignment with EU-type equipment.
Quick Comparison of Popular Flange Standards
| Standard | Origin | Measurement | Pressure Ratings | Common Use Cases |
|---|---|---|---|---|
| ANSI | USA | Inch | Class 150 – 2500 | Oil & gas, chemical, heavy industry |
| JIS | Japan | Metric | 5K – 30K | Water systems, fire-fighting, general use |
| DIN | Germany | Metric | PN6 – PN40 | Water treatment, food, EU industries |
| BS | UK | Metric | PN6 – PN40 | Utilities, civil construction |
Sunjin Metals Vina – Trusted Flange Supplier for All International Standards
At Sunjin Metals Vina (SJM Vina), we stock and supply a full range of steel flanges manufactured to ANSI, JIS, DIN, and BS standards, serving various industries including:
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Oil & Gas, Petrochemicals
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Power Plants, HVAC, Water Treatment
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Food Processing & Industrial Facilities
Why choose SJM Vina?
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Certified products (CO-CQ available)
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Wide inventory – fast nationwide delivery
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Experienced technical support for every project
📍 Address: 628 Le Hong Phong, Ward 10, District 10, Ho Chi Minh City, Vietnam
📞 Hotline: +84 33 4233 127
📧 Email: sjmvina@sunjinmetal.com
🌐 Website: www.sjmvina.com.vn
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