Quality Assurance
Every pipe undergoes 8-stage in-process inspection. Bonding strength ≥ 0.8 MPa — exceeding the API 5LD minimum of 0.3 MPa. Full documentation with every delivery.
8-Stage Inspection Process
100% coverage from raw material to finished product
Raw Material
Direct-reading spectrometer (OES) analysis, material certificate verification
Pipe Forming
Dimension tolerance, weld seam quality (online ultrasonic)
Surface Prep
Shot blasting cleanliness, roughness measurement
Assembly
Fit-up gap, alignment inspection
Spin Bonding
Process parameter monitoring, bonding force spot-check
NDE Testing
100% ultrasonic + 100% eddy current on bond interface
Hydro Test
Hydrostatic pressure test per GB/T 241-2007
Final Inspection
Endoscopic bore inspection, dimensional report, MTR
Testing Equipment
CNAS-certified laboratory with complete non-destructive testing capability
OES Spectrometer
Direct-reading optical emission for precise alloy composition verification
UT System
100% ultrasonic scanning of bond interface for delamination detection
ET System
100% eddy current inspection for surface and near-surface defects
Hydro Test Bench
Pressure testing up to 25 MPa with automated data logging
X-Ray Flaw Detector
Radiographic inspection of weld integrity and internal structure
Endoscope Camera
Bore inspection with high-resolution imaging and video recording
Testing & R&D Laboratory
Independently audited CNAS-certified laboratory for material testing and quality validation. Jointly established with the China Building Metal Structure Association.
- Direct-reading spectrometer (OES) for alloy composition analysis
- X-ray flaw detection system for weld integrity verification
- Ultrasonic thickness gauge for precise wall measurement
- Endoscopic bore inspection with high-resolution imaging
- Hydrostatic pressure testing bench (up to 25 MPa)
Third-Party Inspection
We welcome client-nominated inspectors and support SGS, Bureau Veritas, DNV, and other international inspection agencies for witness testing and sign-off.
Need inspection reports?
We provide full Mill Test Reports, material certificates, and third-party inspection reports on every order. Contact us to discuss your specific documentation requirements.
Request Documentation