TechnicalTechnical
Socket-Weld Fitting Dimensions and Material Checks
Confirm socket-weld fitting dimensions per ASME B16.11 and material to ASTM A105. Learn what to specify, inspect, and include in the RFQ.
Aug 17, 20265 min readHebei Haihao Group
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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 guideBuyer guide
EN 10204 3.2 Certificate: When Buyers Should Require Third-Party Inspection
A practical guide to EN 10204 3.2 certificate requirements, when third-party inspection is needed, and how to write clear RFQ wording for pipe fittings and flanges.
Aug 16, 20267 min readHebei Haihao Group
TechnicalTechnical
PT vs MT for Weld Pores: Which NDT Method Should Buyers Specify?
PT and MT are both surface inspection methods, but they do not solve every pore or weld defect problem. Learn when PT, MT, UT or RT should be specified.
Aug 15, 20266 min readHebei Haihao Group
TechnicalTechnical
ASTM A350 LF3 Chinese Equivalent: Why Buyers Should Not Match by Grade Name Alone
A buyer guide for A350 LF3 low-temperature forgings and Chinese-equivalent questions: compare chemistry, mechanical properties, impact temperature and project approval, not just grade names.
Aug 14, 20266 min readHebei Haihao Group
Buyer guideBuyer guide
MTC 3.1 Certificate Template Fields: What Buyers Should Check Under EN 10204
A field-by-field checklist for reviewing an EN 10204 3.1 mill test certificate without relying on fake sample certificates or incomplete templates.
Aug 13, 20267 min readHebei Haihao Group
TechnicalTechnical
GB Pressure Piping RT Percentage: How to Specify NDT Without Guessing
A practical buyer guide for GB pressure piping RT percentage questions: why there is no universal number, what documents to request, and how to write NDT requirements in an RFQ.
Aug 12, 20267 min readHebei Haihao Group
Buyer guideBuyer guide
Low/Medium Pressure Flanges vs. Weld Neck Flanges: A Procurement Guide for EPC Buyers
Choosing between low/medium pressure flanges and weld neck flanges depends on system pressure, temperature, and application. This guide covers key differences, standards, inspection requirements, and RFQ best practices for global procurement professionals.
Jul 24, 20265 min readHebei Haihao Group
Buyer guideBuyer guide
Procurement Guide for Stainless Steel Flanges: Key Features, Applications, and Selection Tips
Stainless steel flanges are critical for piping systems in demanding industries. This guide covers standards, inspection documents, RFQ essentials, and quality risks to help procurement engineers make informed decisions.
Jul 24, 20266 min readHebei Haihao Group
Buyer guideBuyer guide
How to Source High-Pressure Flanges for EPC Projects: A Procurement Guide
A practical guide for EPC procurement engineers on sourcing high-pressure flanges, covering standards, inspection documents, RFQ checklist, quality risks, and pre-quotation information.
Jul 23, 20265 min readHebei Haihao Group