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Technical articles, standards comparisons, project case studies and buyer guides on pressure piping components, flanges and forged fittings.
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Buyer guideThe mill test certificate matters more than the price quote — but only if you know what to look for. Here is the 4-type EN 10204 system, what makes a 3.1 valid, and when 3.2 is mandatory.
StandardsWet H₂S environments demand specific material chemistry, hardness limits, and heat treatment. Here is what NACE MR0175 actually requires for buttweld fittings and forged flanges.
TechnicalFour common NDT methods are used on buttweld fittings and forged flanges. Each catches different defects — pick the wrong one and you ship the flaw.
StandardsEN 10253 and ASME B16.9 cover the same product family but diverge on a few sizes, on PED conformity, and on allowable stresses. Buyers shipping into the EU need to read the small print.
TechnicalWPL6 fittings are spec'd by their Charpy V-notch impact properties at -45°C. Here is what your MTC must report and what the acceptance numbers actually are.
StandardsASME B16.9 covers everyday carbon and alloy steel fittings. MSS SP-75 is for high-yield, high-pressure pipeline service. Here is when each one applies — and why mixing them is a costly mistake.
TechnicalUnderstand what ASTM A234 WPB requires for chemistry, heat treatment, and post-weld treatment so you can spec carbon-steel buttweld fittings without surprises at inspection.
Industry newsHaihao Flange Pipe Fittings: Providing Custom Services for Aerospace, Heavy Industry and Other High-Tech Fields. In today's era of rapid high-tech development, the demand for medium and low pressure pipe flanges in aerospace, heavy industry and other high-tech fields is growing.
Industry newsIn the field of pipeline engineering in China, medium and low pressure pipe flanges are a very important component. As a professional manufacturer of high-pressure flange fittings, Haihao is dedicated to creating high-quality medium and low pressure pipeline components.
