Service Content
Prefabricated buried insulated FRP pipe is a composite of a working/carrier steel pipe, a rigid polyurethane foam insulation layer and an FRP outer jacket, widely used for directly buried conveyance of district heating, industrial steam and hot/cold media. The mechanical and waterproof performance of the outer jacket, together with the density and thermal conductivity of the insulation foam, directly govern the corrosion-protection life and heat loss of the network. Following the relevant product standards, the LEISA Technology laboratory provides dedicated/partial-parameter third-party testing of buried insulated pipe, covering outer-jacket appearance, density, tensile and flexural strength, water seepage, wall thickness, plus foam density, compressive strength, water absorption, thermal conductivity and overall ring stiffness (parallel-plate loading), providing a basis for product acceptance and project quality assessment.
Test Items
- Parallel-plate ring stiffness: resistance to external-load deformation, per ASTM D2412.
- Outer-jacket appearance: surface defects, delamination and colour difference, per the product standard.
- Outer-jacket density: FRP jacket density, per GB/T 1033-1.
- Outer-jacket tensile strength: tensile strength and elongation, per GB/T 8804-3.
- Outer-jacket flexural strength: flexural strength and modulus, per GB/T 1449, ISO 178.
- Outer-jacket water seepage: waterproof sealing of the jacket, per the product standard.
- Outer-jacket wall thickness: jacket thickness distribution, per GB/T 8806.
- Foam density: rigid polyurethane foam density, per the product standard.
- Compressive strength: compressive strength of the insulation foam, per the product standard.
- Water absorption: water uptake of insulation and jacket, per GB/T 1462.
- Thermal conductivity: insulation thermal conductivity / insulation effectiveness, per the product standard.
Service Process
- Sample receipt and registration: record diameter, insulation structure and batch.
- Plan confirmation: select test items per heating/industrial-network standards.
- Specimen preparation: prepare jacket, foam and whole-pipe specimens and condition them.
- Testing: complete mechanical, waterproof, density and thermal tests.
- Data processing and review: calculate, judge conformity and review.
- Report delivery: issue the report with insulation and corrosion-protection advice.
Advantages
- Layer-by-layer assessment: jacket, insulation and whole-pipe quantified separately.
- Thermal and mechanical: both insulation effectiveness and load/deformation resistance.
- Acceptance-oriented: data usable directly for heating-network site and completion acceptance.
Through systematic testing of the outer jacket, insulation foam and whole pipe, the LEISA Technology laboratory helps manufacturers and contractors accurately control the three key qualities of waterproofing, insulation and structural strength, extending the service life of buried networks and reducing heat loss.
Applicable standards: GB/T 1033-1, GB/T 1449, GB/T 1462, GB/T 8804-3, GB/T 8806, ISO 178, ASTM D2412.