BEIJING URBAN-RENEWAL SOLUTIONS CO., LTD Faqs

Spray-In-Place Pipe (SIPP) is an integrated technology stack—materials, intelligent robotics, and data-driven process control—engineered to deliver consistent rehabilitation quality in real-world, complex pipe environments.

• Purpose-built formulations for functional, semi-structural, and full structural rehabilitation.
• Designed for strong bonding, continuity, and long-term protection in aging pipelines.
• Material selection and design parameters can be tailored to pipe condition, diameter changes, and operating environments.

• Self-developed spray robotics deliver controlled, repeatable application along the full pipeline length.
• Equipment configurations support complex geometries and constrained access (bends, reducers/transition sections, inverted siphons, and single-entry pipelines).
• Mobile command capability integrates equipment coordination, process monitoring, and on-site execution management.

• Standardized construction workflows with defined checkpoints—from cleaning and surface preparation to application, curing, and inspection.
• Controlled application parameters (e.g., spray rate, thickness control, pass strategy) to improve consistency and traceability.
• Engineering-grade documentation and governance to support reliable delivery across different cities and operating conditions.

• Drinking-water safety testing aligned with GB/T 17219.
• Mechanical properties: tensile, flexural, hardness.
• Adhesion/bond strength to pipe substrates.
• Chemical resistance (liquid immersion), impermeability, abrasion resistance.
• Hydraulic performance: roughness / flow testing.
• Long-term performance: creep testing (including long-duration testing and service-life extrapolation).

• Internal pressure / burst tests (including defect-bridging scenarios such as drilled holes).
• Standalone liner pressure-hold tests (to validate independent load-bearing where needed).
• Defect bridging tests across holes/cracks under water pressure.
• Vacuum negative-pressure tests (to validate performance under transient negative pressure conditions).
• External load / soil-box tests (to validate external pressure and buried-condition performance).
• Bonded vs. non-bonded comparative testing: bonded linings demonstrate markedly higher external-pressure resistance than "contact-fit" (unbonded) linings.
• Puncture / accidental damage tests to validate non-catastrophic damage behavior and repairability.

• Bonded-to-substrate performance: Applied and cured directly on the pipe wall to create a continuous bonded lining, rather than relying primarily on mechanical "press-fit" contact like many pre-fabricated liners. Supports more reliable continuity through bends, transitions, and irregular sections.
• Seamless, in-situ application: Eliminates seams typical of prefabricated liner methods and conforms to irregular geometry.
• Strong advantage in pressurized pipelines: The bonded interface is critical for pressurized conditions (internal pressure and external pressure), supporting stable lining performance and reducing the risk of interface slip or under-lining leakage pathways. Designed around the reliability and performance requirements of pressure-bearing systems.

Our SIPP technology has undergone extensive testing to validate performance across multiple criteria:

• Drinking water safety certification: Complies with national standards (GB/T 17219) for materials in contact with drinking water, including immersion tests and toxicology studies
• Mechanical performance: Tensile strength, bending strength, hardness, and adhesion testing
• Chemical resistance: Liquid resistance testing across various media (acids, alkalis, industrial fluids)
• Flow performance: Roughness coefficient testing showing flow capacity improvements of 125-128% for rehabilitated pipes
• Durability: Long-term creep testing (10,000+ hours) projecting stable performance over 50+ years

• Bond strength with original pipe: >2.0 MPa with concrete pipes, >5.0 MPa with metal pipes
• Bare liner internal pressure test: Independent load-bearing capacity validation at 1.0 MPa for 24 hours with no change
• Internal pressure burst test: 2mm coating withstands 0.98 MPa pressure with 10cm damage hole
• Cross-crack/cross-hole repair: Successfully covers 3mm cracks and 5mm diameter holes
• Negative pressure resistance: Vacuum testing to -0.1 MPa, 24 hours with no change
• External load capacity: Different coating thicknesses (3-8mm) increase pipe failure pressure by 41%-167%
• Soil box testing: Simulated buried pipe load testing shows failure load of rehabilitated concrete pipes increases 2-4 times

• Bonding vs. contact process: Testing demonstrates bonded linings achieve ~5x higher external pressure resistance compared to non-bonded contact linings of equal thickness
• Puncture resistance: Impact and puncture testing confirms localized damage does not propagate through the lining

• Deployed across 10+ provinces and 25+ complex rehabilitation projects
• Proven performance in extreme conditions: sub-zero temperatures (-21°C), high-temperature industrial applications (95°C+), inverted siphons, river crossings, and continuous-flow scenarios