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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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105 articles· Buyer guide

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
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
万能拉力机.JPGBuyer guide
Buyer guide

NPT Threaded Fitting Inspection: B1.20.1 Gauging and RFQ Controls

Learn how to inspect NPT threaded fittings per ASME B1.20.1 and B16.11, including gauging, RFQ inputs, and documentation checks for EPC buyers.

Sep 29, 20266 min readHebei Haihao Group
化工厂.jpgBuyer guide
Buyer guide

ASME B31.1 Replacement Piping Spools: A Component Specification Guide

Specifying replacement piping spools for power plants requires careful alignment with ASME B31.1 and B16.9. This guide covers key procurement checks, RFQ inputs, and inspection points to ensure code compliance and safe operation.

Sep 24, 20266 min readHebei Haihao Group
8字盲板 (2).jpgBuyer guide
Buyer guide

Orifice Flange RFQ Checklist: B16.36 Details Buyers Often Miss

ASME B16.36 orifice flanges have unique requirements beyond B16.5. This guide covers scope, procurement checks, inspection points, and common risks to help EPC engineers and buyers specify correctly.

Sep 19, 20266 min readHebei Haihao Group
IMG_1251.JPGBuyer guide
Buyer guide

Hydrogen Piping Components: What an ASME B31.12 RFQ Must Define

ASME B31.12 governs hydrogen piping and pipelines. This guide explains what EPC engineers and procurement managers must specify in an RFQ for seamless pipes and socket-weld forged fittings, covering code parts, material verification, and inspection requirements.

Sep 14, 20267 min readHebei Haihao Group
管件总图.jpgBuyer guide
Buyer guide

Buttweld Spool Fit-Up: Coordinating ASME B16.9 Fittings and B16.25 Ends

Learn how to coordinate ASME B16.9 fittings with B16.25 bevel ends for reliable buttweld spool fit-up. Includes procurement checks, inspection points, and common risks.

Sep 9, 20266 min readHebei Haihao Group
中频弯管机.jpgBuyer guide
Buyer guide

Valve End Connections and Mating Flanges: A B16.34 and B16.5 Buying Guide

Understand how ASME B16.34 and B16.5 interact for valve-to-flange compatibility. Learn key procurement checks, RFQ inputs, and inspection points to avoid mismatches.

Sep 4, 20266 min readHebei Haihao Group
p01_003_011d8f3f6eb1f9fa4bca7f3145ecdfad.pngBuyer guide
Buyer guide

Matching ASME B16.11 Forged Fittings to Pipe Size and Schedule

Learn how to correctly match ASME B16.11 forged fittings to pipe size and schedule. Understand the relationship between fitting class and pipe schedule, and get practical procurement and inspection tips.

Aug 30, 20266 min readHebei Haihao Group
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