YUHAO Delivers Full-Spectrum Flange Manufacturing Standard Compliance: From ANSI/ASME to GOST, One Partner Covers All

In the global pipeline and pressure vessel industry, flange manufacturing standards are not merely technical documents — they define dimensional accuracy, pressure-bearing capacity, sealing integrity, and, ultimately, operational safety. YUHAO Hardware has built its reputation on delivering full-spectrum standard compliance, ensuring that every flange we manufacture meets the exact specifications required by your project — no matter the country, code, or application.

Selecting the wrong flange standard can lead to installation failure, flange leakage, or catastrophic system shutdowns. Different regions mandate different codes — ANSI/ASME in the Americas and Middle East, EN 1092-1 across Europe, JIS in Japan and Southeast Asia, and GOST throughout Russia and the CIS. Interchangeability between standards is extremely limited; each system governs bolt circle diameters, flange thickness, facing types, and material grades independently.

ANSI/ASME B16.5 & B16.47 (United States): The most widely adopted flange standard globally. Pressure ratings span Class 150 through Class 2500, with B16.5 covering NPS 1/2" to 24" and B16.47 extending to 60" for large-diameter applications. Facing types include Flat Face (FF), Raised Face (RF), and Ring Type Joint (RTJ). Material coverage extends from carbon steel (A105) and stainless steel (F304/F316) to alloy steels (F11/F22/F5/F9) and duplex grades. This standard governs the majority of oil & gas, petrochemical, and power generation projects worldwide.

EN 1092-1 (European Union): The successor to legacy national standards including DIN (Germany) and BS (UK), EN 1092-1 offers the broadest type coverage of any single standard — 13 flange types (Type 01 through Type 13) across PN 2.5 to PN 400. With a metric DN system spanning DN 10 to DN 4000, it is the go-to standard for European projects and Chinese export orders targeting EU markets. Facing designations include Type A (Flat), B1 (Raised), and C/D (Tongue & Groove).

JIS B2220 (Japan): Rated by the "K" system (5K to 63K), derived from kgf/cm². JIS flanges are typically more compact and lighter than equivalent ASME flanges, making them popular in marine engineering, chemical plants, and food processing equipment across Japan and Southeast Asian shipyards. Bolt patterns and dimensions are unique — direct interchange with ANSI or EN flanges is not possible.

GOST 12820 / 12821 (Russia & CIS): Specifically engineered for Russia, Kazakhstan, Uzbekistan, and surrounding CIS nations. GOST flanges use distinct material grades such as 09G2S (low-carbon structural steel) and 12X18H10T (stainless steel), with rigorous low-temperature impact testing down to -70°C — a requirement unmatched by any other standard. For projects involving Siberian or Arctic pipeline infrastructure, GOST compliance is mandatory.

BS 4504 (United Kingdom): While technically superseded by EN 1092-1, BS 4504 remains commonly referenced in legacy project specifications across the UK, India, Pakistan, and South Africa. YUHAO maintains full backward compatibility with BS 4504 for retrofit and maintenance contracts.

• Project in the Americas or Middle East: ANSI/ASME B16.5 / B16.47
• Project in Europe or Africa: EN 1092-1
• Project in Japan or Southeast Asian shipyards: JIS B2220
• Project in Russia or CIS nations: GOST 12820 / 12821
• Legacy UK/Commonwealth retrofit: BS 4504

What sets YUHAO apart is our ability to deliver all of the above standards from a single source. Whether your project demands Class 2500 ANSI B16.5 flanges in F316 stainless steel, PN 400 EN 1092-1 Type 11 weld-neck flanges, or GOST 12821 flanges in 09G2S with -70°C Charpy impact certification — YUHAO manufactures and certifies them all under one roof.

Every shipment is accompanied by EN 10204 3.1 Material Test Reports (MTR) and a compliance declaration specific to the applicable standard. By consolidating multi-standard procurement with YUHAO, project owners eliminate the risk of mixed-standard installations and streamline their supply chain.

For standard-specific flange inquiries, contact YUHAO with your project requirements: location, medium (water/oil/gas/chemical), operating temperature and pressure, and nominal size range. Our engineering team will provide a compliance-matched quotation within 24 hours.