Technology
End-to-end quality control ensures the smooth operation of pipelines.
Production Process
Procurement of materials
Chemical analysis
Storage
Cutting to drawing dimensions
Dimensional inspection
Plate rolling
Dimensional inspection
Longitudinal weld
Dimensional inspection
Magnetic particle inspection
Forming
Dimensional inspection
X-ray inspection
Solution heat treatment
Dimensional inspection
Assembly
Testing
Magnetic particle inspection
Cleaning
Painting
Packaging
Storage
Based on the operating environment, specific medium, temperature, and pressure conditions of this project, our company has conducted data processing, strength, and stiffness verification in our computer software system in accordance with the *General Technical Conditions for Bellows-Type Metal Expansion Joints*, GB/T 12777-2019 *General Technical Conditions for Metal Bellows Expansion Joints*, GB 150-1998 “Steel Pressure Vessels,” and the American EJMA-2008 standard. After performing data processing, calculations, and strength and stiffness verifications using computer software systems, and ensuring compliance with the user’s technical requirements, we proceed to establish the production process and commence manufacturing. The finished products must undergo a series of rigorous physical tests to be deemed qualified.
The bellows are made of stainless steel. Prior to hydraulic forming of the bellows blank, the longitudinal weld must undergo non-destructive testing, with results meeting Grade II requirements as specified in JB/4730.2-2005 to be considered passed; The tube is then formed using integral hydraulic forming; the fillet welds connecting the corrugated tube to the cylinder sections are made using TIG welding. Post-welding, dye penetrant testing and kerosene penetrant testing must be performed; no cracks or defects affecting strength are permitted. The corrugated tube must pass inspection before being used in assembly.
The pipe sections shall be beveled to facilitate welding to the pipeline sections. The weld bead height for both lap and fillet welds shall be equal to the thickness of the thinner of the two welded components and shall be continuous.
During the assembly and welding of metal expansion joints, the surface of the bellows shall be covered to prevent spatter from landing on it. It is strictly prohibited to strike an arc on the surface of the bellows to avoid damage.
Metal expansion joints must be securely braced and protected during lifting, transportation, and installation to ensure safety. Bracing components should be marked with yellow paint and removed or cut off after final installation.
Metal expansion joints may only be shipped after manufacturing is complete and they have passed a joint inspection and acceptance.
Commissioning shall be conducted within one week of the product’s arrival at the site, or as mutually agreed upon.
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Pipeline Industrial Park, South Section of Yong'an Road, Xicun Town, Gongyi City, Henan Province
