Quality Control
Table of Contents
Testing Standards & Certification
Nonleak adheres to comprehensive international, national, and industry standards to ensure every product meets the highest quality requirements.
Enterprise Standard
Nonleak Enterprise Standard Q09297288-5·1-2020
Stainless Steel Pipes Standard
Size Range: DN15-DN350
Standard: *GB/T12771-2019 “Stainless Steel Welded Pipes for Fluid Transportation”*
Stainless Steel Pipe Fittings Standard
Threaded Press-Fit Connection
Size Range: DN15-DN100
Applicable Standards:
Q/9297288-5.1-2014 “Stainless Steel Threaded Press-Fit Fittings”
HG/T3737-2018 “Single-Component Anaerobic Adhesive”
JB/T7311-2008 “Technical Specification for Application of Anaerobic Adhesive, Silicone Rubber and Dry Film Pre-coating in Construction Machinery”
DBJ51/T 023-2014 “Technical Specification for Thin-Walled Stainless Steel Pipeline with Press-Fit Adhesive Connection for Gas”
CECS 423:2016 “Technical Specification for Thin-Walled Stainless Steel Pipeline with Adhesive Connection”
- ASME B16.11
Orbital Press Connection
Size Range: DN15-DN100
Applicable Standards:
GB/T33926-2017 “Stainless Steel Orbital Press Fittings”
CJJ94-2009 “Code for Construction and Quality Acceptance of Indoor Gas Engineering”
DB51/T5035-2012 “Technical Specification for Thin-Walled Stainless Steel Pipeline with Orbital Press Connection for Gas”
GB/T23658-2009 “Elastomeric Seals – Material Requirements for Seals Used in Pipes and Fittings for Transporting Gaseous Fuels and Hydrocarbon Liquids”
HG/T3092-1988 “Rubber Seal Compounds for Gas Transmission Pipes and Fittings”
- EN 10312, ISO 15835, AS/NZS 4128
Double-Press Connection
Size Range: DN15-DN100
Applicable Standards:
GB/T 19228.1-2011 “Stainless Steel Press-Fit Fittings – Part 1: Press-Fit Fittings”
GB/T 19228.2-2011 “Stainless Steel Press-Fit Fittings – Part 2: Stainless Steel Tubes for Connections”
GB/T19228.3-2012 “Stainless Steel Press-Fit Fittings – Part 3: O-Ring Rubber Seals”
- EN 10312, ISO 15835, AS/NZS 4128
Testing & Inspection Standards
Mechanical Properties
Tensile Strength: ≥520 MPa
Elongation: ≥35%
Eddy Current Testing: Compliant with GB/T7735 Grade A
Flattening Test: No cracks or fractures when compressed to 1/3 of pipe diameter
Stress Testing
Fitting Pressure Test: >1.05 MPa (each product individually tested)
System Pressure Test: 2.5 MPa for 14 hours (no leakage at connections)
Third-Party Certification
Sichuan Provincial Center for Disease Control and Prevention
Product Tested: Nonleak Stainless Steel Welded Pipes for Fluid Transportation
Result: Fully compliant with all specified standards and regulations
National Building Materials Product Quality Inspection Center
Product Tested: Nonleak Stainless Steel Manifolds
Result: Meets all national quality standards and performance requirements
Product Tested: Nonleak Threaded Press-Fit Pipeline System
Key Finding: 70-year service life certification
Result: Verified long-term durability and performance reliability
Our Quality Commitment
To Our Valued Customers:
At Nonleak, quality is not just a process — it’s our promise. We guarantee:
Every Product Tested: Each pipe and fitting undergoes rigorous pressure, material, and performance testing
Leak-Proof Performance: Our patented connection technologies ensure zero leakage throughout the system lifecycle
Long-Term Reliability: Certified 70-year service life for sustainable, maintenance-free operation
Complete Traceability: From raw material to finished product, full documentation and tracking
Continuous Improvement: Ongoing quality monitoring and process optimization