Blog

Explore industry insights, practical guides, and curated perspectives here—keep getting valuable content.

Home 博客中心

Interpretation of American Standard Carbon Steel Materials for Pipeline Fittings in Foreign Trade

American standard carbon steel is the most mainstream material selection for pipes and fittings in oil and gas, chemical, and EPC overseas engineering projects, and A234 WPB and A105 are high-frequency material grades in foreign trade orders. Different grades correspond to different product forms, heat treatment requirements, and applicable working conditions; incorrect material selection will directly cause problems such as welding mismatch, pressure-bearing failure, and rejection by the owner. This article systematically interprets the ASTM material system for American standard carbon steel pipe fittings, sorts out core foreign trade requirements such as chemical composition, mechanical properties, heat treatment, non-destructive testing, material certificates, and marking traceability, and analyzes procurement selection misconceptions, material substitution boundaries, and ocean shipping protection points, so as to provide a complete technical basis for foreign trade inquiries and quotations, order review, third-party supervision and acceptance, and overseas project delivery, and to avoid risks of material misuse, certificate non-compliance, customs clearance, and project claims.

2026-10-23

Nuclear Power Pipeline Fittings Procurement Access Standards

Nuclear power pipeline pipe fittings belong to nuclear safety pressure boundary components and are classified into nuclear levels 1, 2, and 3. They differ from conventional pipe fittings used in thermal power and chemical industries, and their market access is subject to multiple rigid constraints including nuclear safety regulations, administrative licensing, and nuclear quality assurance systems. Current procurement commonly suffers from problems such as substituting conventional pressure pipeline pipe fittings for nuclear-grade pipe fittings, ignoring the scope of licenses, missing quality assurance documents, and substandard material impurity control. This paper establishes procurement access standards for nuclear power pipe fittings from seven dimensions: the regulatory system, supplier qualification access, the quality assurance program, material and process control, supervision and acceptance, document traceability, and closed-loop management of non-conformance items. It clarifies tiered control requirements to prevent nuclear safety risks caused by non-conforming items.

2026-10-23

Professional Procurement Standard System for Marine Piping and Fittings

Ship piping and fittings differ from onshore industrial piping: they are constrained by classification society rules, international maritime regulations, and complex in-hull operating conditions, are managed under Class I, II, and III piping system classifications, and are the foundation for the safe operation of ship power, ballast, fuel oil, fire protection, and liquid cargo systems. Current procurement frequently encounters problems such as mixing marine standards with chemical standards, lack of classification society approval certificates, insufficient seawater corrosion resistance of materials, and missing test documentation. This article sorts out the entire procurement system covering the regulatory pedigree of ship piping systems, classification determination rules, supplier admission, material selection, inspection and testing, and documentation closure, clarifies the control points at each stage, and avoids classification survey rejection and offshore pipeline leakage risks.

2026-10-22

Basic Specifications for Procurement of Municipal Water Supply and Drainage Pipeline Fittings

Municipal water supply and drainage are divided into two major systems: pressure water supply pipelines and gravity-flow drainage pipelines. They implement specialized water supply and drainage standards such as GB50268 and GB50788, and their control logic differs significantly from that of chemical and thermal pressure pipelines. For water supply pipe fittings, the focus of control is on pressure-bearing grade, drinking water hygiene and safety, and joint sealing performance; for drainage pipe fittings, the emphasis is on ring stiffness, settlement resistance, and seepage and leakage prevention. In procurement practice, problems often arise such as mismatched standards between pipes and fittings, missing hygiene indicators, misuse of pressure-bearing fittings in non-pressure pipelines, and omitted items in incoming re-inspection. This article sorts out the water supply and drainage standard framework, material selection, supplier admission, document verification, and pressure test acceptance key points, distinguishes the control boundaries between pressure pipes and gravity pipes, and provides standardized guidance for the procurement of pipe fittings for municipal water supply, rainwater, and sewage pipeline networks.

2026-10-22

Key Points of Urban Heating Standards for Thermal Pipeline Fittings

Urban heating pipelines belong to the GB category of public pressure pipelines and are divided into two major scenarios: primary high-temperature steam networks and secondary hot-water networks. They implement the CJJ urban heating industry standard system and differ significantly from the control logic of GC industrial process pipelines and GCD power plant power pipelines. In the procurement process, problems often arise such as industrial pipe fittings being directly substituted for prefabricated insulated pipe fittings specially used for heating, ignoring the reinforcement requirements for directly buried pipe fittings, disconnect between supporting standards for insulation and anti-corrosion, and acceptance documents not conforming to special heating specifications. This article sorts out the standard framework for urban heating pipe fittings, material selection, special indicators for prefabricated insulated pipe fittings, and key points for incoming acceptance and pressure test control, clarifies the boundaries of special equipment supervision for heating pipelines, and provides standardized guidance for the procurement of pipe fittings for municipal heating and heat exchange station networks.

2026-10-22

Petrochemical Pipeline Fittings API Standard Procurement Awareness

API standards are a specialized specification system for the petroleum industry widely adopted in long-distance oil and gas transmission and refining and petrochemical projects. They are distinct from the general ASME process piping standards, and are fundamentally based on API Spec 5L line pipe, accompanied by a series of requirements for welding, anti-corrosion, and inspection. Domestic petrochemical procurement often confuses API pipeline standards with ASME fitting standards, leading to problems such as incorrect selection of PSL grades, missing toughness indicators, incomplete documentation chains, and non-compliant adoption of domestic special equipment requirements. This article outlines the API standard system architecture, grading logic, inspection and traceability requirements, distinguishes the boundaries between API, ASME, and SH petrochemical standards, and establishes an API fitting procurement control process suitable for domestic refining and petrochemical and oil and gas transmission projects, so as to avoid selection and acceptance risks.

2026-10-22

Basic Procurement Standards for Power Plant Piping and Fittings

Power plant power piping belongs to GCD power pressure piping, which is different from chemical GC process piping; it mainly handles high-temperature and high-pressure steam-water media and implements the DL special standard system of the electric power industry. This paper sorts out the special requirements of the standard framework, material classification, manufacturing inspection, and supervision inspection traceability for power plant piping and pipe fittings, compares the differences in procurement logic between power piping and industrial process piping, analyzes typical risks in procurement such as mixing chemical pipe fittings, standard mismatch, and lack of heat treatment and nondestructive testing control, and establishes a closed-loop control system for procurement technical agreements, supplier admission, and incoming re-inspection adapted to thermal power, cogeneration, and new energy power stations, so as to provide basic guidance for compliant procurement of power station piping materials.

2026-10-22

Compliance Requirements for the Procurement of Special Equipment for Pressure Piping

Pressure piping is a special equipment subject to key supervision, and procurement compliance is a prerequisite for achieving installation supervision and inspection, use registration, and safe commissioning. In accordance with the Special Equipment Safety Law, TSG 31-2025, GB/T 20801, and other regulations and standards, pressure piping procurement is not a simple purchase of materials, but a full-chain compliance management covering supplier admission, graded selection, technical agreements, verification of factory documents, re-inspection upon arrival at site, and control of changes and substitutions. At present, engineering projects commonly suffer from problems such as invalid supplier qualifications, broken document traceability, non-compliant adoption of overseas standards, and unauthorized material substitution, which can easily lead to rejection of supervision and inspection, project delays, and hidden safety hazards. This article systematically sorts out the key points of compliance control throughout the entire procurement process, providing standardized guidance for pressure piping procurement in chemical, oil and gas, energy storage, and thermal power projects.

2026-10-21

Pressure Piping Classification and Procurement Requirements

Pressure piping belongs to special equipment and is classified by medium, pressure, temperature, and hazard level. Piping of different classes has clearly differentiated requirements in material selection, standard selection, inspection and testing, document archiving, and acceptance control. Many procurement personnel confuse the class boundaries of GC1, GC2, GC3, and other piping classes, simply using pressure values as the basis for selection, which causes problems such as low-class materials being used in high-risk working conditions, missing documents, and failure to pass supervisory inspection. Based on TSG 31 and GB/T 20801 specifications, this article explains the logic of pressure piping classification and the elements for class determination, sorts out the procurement technical requirements, document requirements, factory inspection, and incoming control points for pipes, fittings, flanges, and fasteners according to different classes, clarifies common procurement misunderstandings, and establishes a classified and compliant procurement control system to ensure the compliant commissioning of pressure piping as special equipment.

2026-10-21

Flange pipeline complete set matching procurement standard

Flanges are the core pressure-bearing components that enable detachable connections in piping systems. Flanges, pipes, fittings, bolts, and gaskets together constitute a complete flange connection unit, and any mismatched parameter will cause risks such as sealing leakage, pressure test failure, and equipment interface docking failure. This article focuses on mainstream piping standard systems such as national standards, American standards, and European standards, and from dimensions including flange pressure ratings, sealing face forms, outer diameter and wall thickness, material grades, bolt and gasket matching, governing standards, and working condition adaptability, sorts out the complete set matching procurement standards for flanges, clarifies common misunderstandings of cross-standard mixing, and establishes a complete set of control processes from drawing material requisition, bill of materials preparation, supply verification to incoming acceptance inspection, so as to provide a complete technical basis for complete-set procurement of industrial piping flanges and reduce mismatching rework and hidden dangers of safety leakage.

5 6 7 8 9 10 11