Raw Material Inspection & Traceability
Before production commences, all incoming raw materials undergo strict verification against project specifications.
Incoming Material Verification:
Material certificate verification (Mill Test Certificates / MTC).
Specification and grade confirmation.
Dimensional and thickness checks.
Surface condition and defect inspection.
Identification marking and color coding validation.
Given that pressure vessels and cryogenic equipment operate under high pressures and extremely low temperatures (-196°C and below), material selection and traceability are critical safety factors.
Material Traceability Management:
We maintain comprehensive records linking steel plates and structural components to their original mill certificates, component logs, welding histories, and inspection reports. This allows clients and inspectors to audit the complete manufacturing history of critical parts.
Advanced Welding Quality Control
Our strict welding management system includes
Qualified Welding Procedure Specifications (WPS) and Procedure Qualification Records (PQR).
Certified welding operators holding valid qualifications.
Real-time welding parameter control (voltage, amperage, travel speed).
Continuous welding process logs and visual inspections post-welding.
Applied Welding Methods
• Automatic Submerged Arc Welding (SAW): For high-efficiency, deep-penetration longitudinal and circumferential seams.
• Tungsten Inert Gas Welding (Argon Arc Welding / TIG): For precision root passes and high-integrity cryogenic piping.
• Gas Metal Arc Welding (CO₂ Shielded Welding): For robust structural and non-pressure assembly welding.
Non-Destructive Testing
To verify internal weld integrity and detect potential flaws, we utilize advanced Non-Destructive Testing methods executed by certified Level II/III inspectors according to ASME, ISO, or GB standards:
• Radiographic Testing (RT): Examines internal weld quality, porosity, and inclusion defects.
• Ultrasonic Testing (UT): Inspects internal material soundness, plate laminations, and thick-walled weld zones.
• Magnetic Particle Testing (MT): Detects surface and near-surface flaws in ferromagnetic materials.
• Penetrant Testing (PT): Identifies micro-surface cracks and discontinuities in stainless steel and aluminum components.
Dimensional & Assembly Inspection
Before intermediate assembly and final shipment, critical dimensions are verified to ensure seamless integration with customer piping and civil foundations:
Overall vessel length, diameter, and shell straightness.
Nozzle orientations, elevations, and flange alignments.
Support saddle and leg positioning.
Assembly squareness and structural alignment.
Pressure Testing & Sealing Verification
Pressure testing is mandatory for all equipment handling compressed industrial gases or liquids.
• Hydrostatic Testing: Pressurizing the equipment with water to 1.25 to 1.5 times the design pressure to verify structural strength and weld integrity.
• Pneumatic / Leak Testing: Confirming sealing performance, gasket integrity, and connection reliability using air or inert gas under controlled pressure.
All test pressures, hold times, and results are officially recorded and countersigned in the project documentation package.
Surface Treatment & Coating Inspection
• Grit Blasting: Achieving specified surface profiles (e.g., Sa 2.5 standard) for optimal paint adhesion.
• Coating Measurement: Using digital gauges to verify dry film thickness (DFT).
• Visual Check: Ensuring uniform gloss, color, and absence of runs, pinholes, or blistering.
• Export Protection: Applying specialized anti-corrosion primers and marine-grade topcoats for overseas transport.
Factory Acceptance Testing (FAT) & Third-Party Inspection
To build absolute confidence before dispatch, we welcome client evaluations:
• Factory Acceptance Test (FAT): Covers visual inspections, document audits, instrumentation verification, control panel functional checks, and safety valve calibration.
• Third-Party Inspection (TPI) Support: We regularly collaborate with international inspection agencies (such as SGS, BV, TÜV, Lloyd's Register) to execute independent material audits, weld monitoring, and pressure test supervision per contract requirements.
Quality Documentation Package
A complete dossier accompanies every shipment to facilitate smooth commissioning, regulatory approval, and facility management:
Material Certificates (MTCs) & Component Traceability Logs
Welding Records & NDT Inspection Reports
Hydrostatic and Leak Test Certificates
Equipment Data Sheets & Nameplate Rubbings
General Arrangement (GA) Drawings & P&ID Schematics
Electrical & Control Schematics (where applicable)
Comprehensive Operation & Maintenance Manuals
Recommended Spare Parts Lists
Secure Packaging & Shipment Preparation
International logistics require rigorous protective measures. Our export preparation process includes:
Thorough internal cleaning, drying, and evacuation (nitrogen purging for cryogenic vessels).
Sealing all nozzle flanges with heavy-duty wooden or plastic protective covers.
Moisture-proof wrapping and desiccant placement inside electrical enclosures.
Secure rigging, cradling, and container/flat-rack fastening to withstand long ocean voyages.
Frequently Asked Questions