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Hebei Haihao Group Huadian High Pressure Pipe Fittings Co., Ltd.
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Hebei Haihao Group Huadian High Pressure Pipe Fittings Co., Ltd.Hebei Haihao Group Huadian High Pressure Pipe Fittings Co., Ltd.Pressure Pipe Fittings · Flanges · Factory Direct

Since 1982. Pressure piping component manufacturer covering elbows, flanges, tees, reducers and project supply.

ISO 9001 quality system · ABS Type Approval · safety-registered manufacturer

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  • Elbow
  • Tee
  • Reducer
  • Flange
  • Pipe Bend

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  • Donglin, Mengcun County, Cangzhou City, Hebei Province, China
  • +86 132 9342 5333
  • +8613293425333💬 chat
  • haihaojituan@163.com
  • www.haihaohuadian.com

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Insights

Insights & Knowledge Center

Technical articles, standards comparisons, project case studies and buyer guides on pressure piping components, flanges and forged fittings.

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312 articles

全图片.JPGTechnical
Technical

Grain Size Verification for Forged Stainless Fittings

Grain size testing under ASTM A182 is mandatory only for certain grades. Learn when ASTM E112 applies, which methods are used, and what buyers must verify before accepting a fitting.

Oct 8, 20266 min readHebei Haihao Group
8字盲板 (2).jpgBuyer guide
Buyer guide

Orifice Flange RFQ Checklist: Class, Type, Taps and Documents

Specifying orifice flanges requires more than a standard flange RFQ. This checklist covers ASME B16.36 scope, class/type limits, tap details, and documentation gaps to verify before ordering.

Oct 7, 20266 min readHebei Haihao Group
合金弯头 (2).jpgStandards
Standards

ASTM A182: Forged Alloy and Stainless Piping Components

ASTM A182 covers forged low-alloy and stainless steel flanges, fittings, valves, and parts for high-temperature service. This guide explains what buyers must specify beyond the standard, including grade, heat treatment, and dimensional standards.

Oct 6, 20266 min readHebei Haihao Group
全图片.JPGTechnical
Technical

Subsize Charpy Specimens and Impact Test Records for Fittings

Charpy impact records for pipe fittings often include subsize specimens. Learn what ASTM E23 and A370 actually require, and where acceptance criteria must be found.

Oct 5, 20266 min readHebei Haihao Group
水暖管件.jpgBuyer guide
Buyer guide

Gray Iron vs Ductile Iron Flanges: A Procurement Comparison

Gray iron and ductile iron flanges are covered by different ASME standards with distinct classes and ratings. This guide explains the key differences, procurement checks, and RFQ requirements to avoid costly specification errors.

Oct 4, 20265 min readHebei Haihao Group
水暖管件.jpgStandards
Standards

ASME B16.42 Ductile Iron Flanges: Classes 150 and 300

ASME B16.42 covers cast ductile iron flanges and flanged fittings in Classes 150 and 300. This guide explains scope, key requirements, and procurement checks for EPC engineers and buyers.

Oct 3, 20266 min readHebei Haihao Group
不锈钢管.jpgTechnical
Technical

Weld Repair Acceptance for Wrought Steel Fittings

Weld repair acceptance for A234 and other wrought steel fittings is governed by the product specification, A960/A960M common requirements, and the purchase order — not by a generic visual pass/fail rule. Here's what to verify.

Oct 2, 20268 min readHebei Haihao Group
化工厂.jpgCase studies
Case studies

Payara and the Prosperity FPSO: A Guyana Offshore Piping Reference

ExxonMobil's Payara development and the Prosperity FPSO mark a major milestone in Guyana's offshore oil production. This case study reviews the project's public facts and outlines what piping procurement professionals should verify when referencing such projects.

Oct 1, 20265 min readHebei Haihao Group
八角垫环.jpgIndustry news
Industry news

Manatee Gas FID in Trinidad and Tobago: A Source-Checked LNG Feedgas Update

Shell's July 2024 FID for the Manatee gas development in Trinidad and Tobago signals continued investment in LNG feedgas. This update outlines what is verified, what remains to be checked, and how EPC buyers can align procurement with evolving project timelines.

Sep 30, 20265 min readHebei Haihao Group
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