When it comes to potable water systems, selecting the correct flange material is more than just an engineering decision — it’s a public health priority. The materials used in water pipelines, phụ kiện, and flanges must meet stringent safety standards to prevent contamination, leaching, và ăn mòn, all while maintaining mechanical strength and longevity.

Vì thế, what flange material is best for potable water? This comprehensive guide will walk you through the ideal options, tiêu chuẩn quốc tế, and key considerations when choosing flanges for drinking water distribution, treatment, and storage systems.

Tại SASA FLANGE, we provide flange solutions that are fully compliant with health and safety codes — trusted by water utilities, infrastructure contractors, and public service engineers worldwide.

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Why Flange Material Matters in Potable Water Systems

Mặt bích được sử dụng để kết nối đường ống, van, and equipment across all segments of a potable water system — from treatment plants to underground distribution mains. The material used in these flanges must meet specific requirements:

✅ Non-toxic and non-leaching

Materials must not release harmful substances such as lead, niken, or cadmium into the water.

✅ Chống ăn mòn

Flanges should withstand constant water exposure and resist rust, rỗ, and scaling.

✅ Durable and pressure-rated

The material must maintain mechanical strength for decades under varying pressure conditions.

✅ Certifiable to drinking water standards

Acceptable materials must comply with international potable water certifications such as:

• NSF/ANSI 61 (Hoa Kỳ)

• WRAS (Vương quốc Anh)

• DVGW (nước Đức)

• AS/NZS 4020 (Australia)

• GB/T 17219 (Trung Quốc)

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Approved Flange Materials for Potable Water

Let’s explore the most commonly approved and recommended flange materials for potable water piping systems:

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1. thép không gỉ (304L / 316L)

Tổng quan:
Stainless steel flanges are widely used for potable water due to their khả năng chống ăn mòn tuyệt vời, non-leaching properties, Và tuổi thọ dài. Lớp như 304L Và 316L are low in carbon and suitable for both cold and hot water systems.

Thuận lợi:

• Độ bền lâu dài

• Hygienic and easy to clean

• NSF 61 and WRAS certified (depending on source)

Ứng dụng:

• Drinking water pipelines

• Pump stations

• Water treatment tanks and skids

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2. Sắt dễ uốn (Epoxy-Coated)

Tổng quan:
Ductile iron offers high strength and cost efficiency but must be coated internally and externally to prevent corrosion. Flanges made from ductile iron are typically lined with fusion-bonded epoxy (FBE) hoặc epoxy paint that complies with drinking water standards.

Thuận lợi:

• Độ bền cơ học cao

• Cost-effective for large diameters

• Approved under many national standards when coated

Ứng dụng:

• Municipal pipelines

• Large valve connections

• Fire protection and water mains

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3. Thau / Bronze (Lead-Free Alloys)

Tổng quan:
In smaller diameter systems, lead-free brass or bronze flanges đôi khi được sử dụng, especially in residential or building plumbing. They must be certified to lead-free requirements, especially in the U.S. under the Safe Drinking Water Act.

Thuận lợi:

• Corrosion-resistant in neutral pH water

• Good machinability

• Suitable for fittings and small-bore piping

Ứng dụng:

• Domestic plumbing

• Meter connections

• Indoor water distribution

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4. PVC / CPVC (Plastic Flanges)

Tổng quan:
In non-metallic piping systems, especially in residential, tưới tiêu, or light industrial potable water applications, plastic flanges made from PVC or CPVC may be used. These materials must also be tested and approved under drinking water safety standards.

Thuận lợi:

• Corrosion-proof

• Lightweight and easy to install

• Low cost

Ứng dụng:

• Water tanks

• Hệ thống áp suất thấp

• Temporary piping lines

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5. HDG Carbon Steel (Not Preferred)

Tổng quan:
Mạ kẽm nhúng nóng (HDG) thép cacbon flanges are sometimes used in non-corrosive, low-purity water systems, but they are generally không được khuyến khích for critical potable water use due to the potential for zinc leaching, chia tỷ lệ, Và coating degradation theo thời gian.

Use only with proper approvals and in short-term, low-pressure, or transitional settings.

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Flange Type Recommendations for Potable Water Systems

Regardless of the material, the following flange types are common in potable water systems:

• Mặt bích trượt: Economical and easy to align, suitable for general water lines

• Mặt bích cổ hàn: For high-pressure or large-diameter lines requiring strength and leak-proof performance

• Mặt bích mù: Used to close off pipe ends or create access points

• Mặt bích có ren: Typically used in smaller pipelines or with plastic piping

• Mặt bích chung: Ideal when frequent dismantling is required, such as in filters or tanks

SASA FLANGE manufactures all of these types in stainless steel and ductile iron for potable water service, with optional certifications and coatings to meet national and international safety standards.

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Gasket and Bolt Considerations

Flange performance in potable water systems also depends on compatible sealing and fastening components:

Vòng đệm:

• EPDM (Ethylene Propylene Diene Monomer) gaskets are widely approved for potable water use.

• Avoid gaskets containing asbestos or industrial-grade rubbers.

Bu lông:

• Sử dụng stainless steel bolts hoặc zinc-coated bolts approved for potable water environments.

• Ensure the entire flange assembly is corrosion-resistant and non-leaching.

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Certifications to Look For

When selecting flange materials for drinking water applications, always verify the following certifications:

• NSF/ANSI 61 (Hoa Kỳ)

• WRAS (Vương quốc Anh)

• ACS (France)

• DVGW W270 (nước Đức)

• AS/NZS 4020 (Australia)

• GB/T 17219 (Trung Quốc)

SASA FLANGE provides stainless steel and epoxy-coated ductile iron flanges tested and certified according to customer region and project requirements.

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Typical Applications for Potable Water Flanges

• Municipal water supply lines

• Underground water distribution mains

• Cơ sở xử lý nước

• Booster pump stations

• RO and UF membrane skids

• Building water systems

• Irrigation and agricultural supply

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Tại sao chọn SASA FLANGE for Potable Water Projects?

SASA FLANGE is a leading manufacturer of high-quality flanges for waterworks and infrastructure projects worldwide. With a full range of materials and sizes, chúng tôi cung cấp:

• Stainless steel 304L / 316L flanges with potable water approval

• Ductile iron flanges with NSF-certified epoxy coatings

• Custom fabrication and pressure classes from PN10 to PN40 and Class 150 ĐẾN 600

• Third-party inspection and 3.1 / 3.2 chứng nhận

• Fast global delivery and full export documentation

Whether you’re building a new water treatment plant or repairing a distribution line, SASA FLANGE provides safe, đã thử nghiệm, and reliable flange solutions — trusted in potable water systems around the world.

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Phần kết luận

Vì thế, what flange material is best for potable water? The answer depends on your application, áp lực , and regulatory requirements — but in general:

• Thép không gỉ (304L/316L) is the gold standard for safety, độ bền, and hygiene.

• Epoxy-coated ductile iron is ideal for large municipal and infrastructure pipelines.

• Plastic or brass flanges are suited for low-pressure and indoor applications, provided they are lead-free and certified.

No matter the material, ensure your flanges are certified for drinking water use and installed with compatible gaskets and bolts.

Chọn SASA FLANGE for flange materials you can trust — safe for people, strong for infrastructure.