FAQ | Jianlong Plastic

Q: During construction in cold regions, how to prevent low-temperature brittleness and ensure the quality of heat fusion joints for HDPE pipes?

High-quality HDPE water supply pipes inherently possess good low-temperature impact resistance (capable of passing -40°C drop weight impact tests). For construction in extremely cold environments, we recommend: 1. Using insulated tarps to cover pipes during storage and allowing them to acclimate indoors for 24 hours before installation. 2. Using hydraulic heat fusion welding machines with automatic temperature compensation and increasing the heating temperature by 10-15°C. 3. Extending the heating and cooling times (refer to our provided "Winter Construction Parameters Table"). 4. Wrapping the completed joint with insulation to allow for slow cooling. Jianlong's HDPE pipes are produced using PE100 compound materials, with a low-temperature embrittlement point below -70°C. We also provide on-site technical guidance for major projects, ensuring a first-pass qualification rate for PE pipe welding exceeding 99.5%.

Q: How to correctly select the specifications and pressure ratings for PP-R pipes and PVC-U pipes in building projects?

Selecting plastic pipes for construction requires following systematic design principles. For PP-R cold and hot water pipes, the appropriate pressure rating series (S5-S2.5) should be chosen based on the hot water system's maximum operating temperature (typically below 70°C). The pipe diameter (DN20-DN110) must be determined through hydraulic calculations for flow rate and pressure drop. For PVC-U drainage pipes, it is recommended to use thicker-walled solid-wall pipes for high-rise building main stacks (e.g., de110×3.2mm), while also calculating the venting system.

Q: In municipal engineering, what are the core advantages of HDPE double-wall corrugated pipes compared to concrete pipes?

In municipal drainage projects, HDPE double-wall corrugated pipes offer revolutionary advantages. First, they are only 1/10th the weight of concrete pipes, eliminating the need for large lifting equipment and increasing construction efficiency by over 50%. Second, the use of electrofusion socket or butt fusion joints achieves zero leakage, preventing groundwater contamination. Third, the unique corrugated structure provides high ring stiffness (up to SN16), effectively withstanding backfill loads and traffic pressure. Fourth, the smooth inner wall has a low friction coefficient, offering a flow capacity up to 30% higher than concrete pipes of the same diameter. Fifth, they are resistant to acid and alkali corrosion, with a service life exceeding 50 years, resulting in lower lifecycle costs. Jianlong's HDPE drainage pipes have passed SGS testing, and we provide complete engineering design solutions, making them an ideal upgrade replacement for traditional concrete pipes.

Q: As a plastic pipe manufacturer, what types of pipes does Jianlong mainly supply?

As a professional plastic pipe manufacturer, Jianlong Plastic Pipe Co., Ltd. specializes in a core product line that includes: HDPE water supply and drainage pipes (for municipal water supply and drainage projects), PVC-U building drainage pipes (for building sewage systems), PP-R cold and hot water pipes (for indoor building water conveyance), PE-RT underfloor heating pipes (for radiant floor heating systems), and MPP power cable conduit (for power and telecommunication engineering). All our plastic pipes and fittings are produced under the strict ISO9001 Quality Management System, ensuring compliance with GB/T National Standards and ISO International Standards. We offer a complete series of products, from HDPE double-wall corrugated pipes (with ring stiffness SN8-SN16) to small-diameter PP-R pipes (DN20-DN110), meeting fluid transport needs in municipal, construction, industrial, and agricultural sectors.

Q: What international certifications do Jianlong's HDPE pipes, PP-R pipes, and other products hold? What is the significance of these certifications for buyers?

Our certification system comprehensively covers major plastic pipe product lines. HDPE water and drainage pipes hold ISO9001 (Quality Management), ISO14001 (Environmental Management), and the PED 2014/68/EU (Pressure Equipment Directive) certificates, ensuring their suitability for EU drinking water projects. PP-R cold and hot water pipes have German DVGW and UK WRAS water contact approvals. PVC-U drainage pipes comply with the Chinese GB/T 5836 standard and come with SGS formaldehyde emission test reports. PE-RT underfloor heating pipes possess Swiss SGS long-term hydrostatic strength test certification (110°C/8760 hours). These certificates are not only a technical endorsement for a plastic pipe manufacturer but also significantly assist overseas buyers (e.g., contractors in the Middle East, building material suppliers in Southeast Asia) in swiftly passing local project acceptance procedures.

Jianlong Plastic－32 Years Specializing in Customized Processing of Plastic Pipes and Fittings.

jianlongplastic@gmail.com +86 17860052961

FAQ

When purchasing plastic pipes, how to distinguish high-quality HDPE pipes from inferior ones made with recycled materials based on appearance and test reports?

Identifying high-quality plastic pipes requires multi-dimensional verification. Visually, HDPE water pipes made from virgin material appear in a natural off-white color with uniform texture, free of colored specks, and have smooth inner and outer walls. Pipes made from recycled material often appear grayish with dark spots.

Regarding markings, genuine pipes have clear, printed codes including the brand, specifications, standard number (e.g., GB/T 13663), material grade (PE100), and production batch. Key test indicators: Request authoritative third-party reports from the supplier, focusing on "Oxidative Induction Time (OIT)" (should be ≥20 minutes, ensuring anti-aging properties) and "Hydrostatic Strength (80°C, 165h)" (no failure). Every batch of Jianlong's PE pipes is produced using 100% virgin material, and we promise full compensation for any falsification.

Can you detail the standard operating procedure and quality control points for PE pipe heat fusion (Butt Fusion)?

Heat fusion welding is a critical process ensuring the integrity of a PE piping system. The standard procedure is as follows:

1. Preparation: Use a dedicated facing tool to squarely trim the pipe end, ensuring end-face perpendicularity error is <0.5mm.

2. Heating: Set the fusion machine temperature (210°C ±5°C) based on the pipe diameter (e.g., DN315). Heating pressure and time must strictly follow our provided "PE Pipe Welding Parameters Table".

3. Changeover: Quickly remove the heating plate to avoid oxidation of the pipe ends.

4. Joining: Complete the joining within the specified time under constant pressure, forming a uniform double bead.

5. Cooling: The pipe must not be moved during the natural cooling period.

During construction in cold regions, how to prevent low-temperature brittleness and ensure the quality of heat fusion joints for HDPE pipes?

High-quality HDPE water supply pipes inherently possess good low-temperature impact resistance (capable of passing -40°C drop weight impact tests). For construction in extremely cold environments, we recommend:

1. Using insulated tarps to cover pipes during storage and allowing them to acclimate indoors for 24 hours before installation.

2. Using hydraulic heat fusion welding machines with automatic temperature compensation and increasing the heating temperature by 10-15°C.

3. Extending the heating and cooling times (refer to our provided "Winter Construction Parameters Table").

4. Wrapping the completed joint with insulation to allow for slow cooling.

Jianlong's HDPE pipes are produced using PE100 compound materials, with a low-temperature embrittlement point below -70°C. We also provide on-site technical guidance for major projects, ensuring a first-pass qualification rate for PE pipe welding exceeding 99.5%.

How to correctly select the specifications and pressure ratings for PP-R pipes and PVC-U pipes in building projects?

Selecting plastic pipes for construction requires following systematic design principles. For PP-R cold and hot water pipes, the appropriate pressure rating series (S5-S2.5) should be chosen based on the hot water system's maximum operating temperature (typically below 70°C). The pipe diameter (DN20-DN110) must be determined through hydraulic calculations for flow rate and pressure drop.

For PVC-U drainage pipes, it is recommended to use thicker-walled solid-wall pipes for high-rise building main stacks (e.g., de110×3.2mm), while also calculating the venting system.

In municipal engineering, what are the core advantages of HDPE double-wall corrugated pipes compared to concrete pipes?

In municipal drainage projects, HDPE double-wall corrugated pipes offer revolutionary advantages.

First, they are only 1/10th the weight of concrete pipes, eliminating the need for large lifting equipment and increasing construction efficiency by over 50%.

Second, the use of electrofusion socket or butt fusion joints achieves zero leakage, preventing groundwater contamination.
Third, the unique corrugated structure provides high ring stiffness (up to SN16), effectively withstanding backfill loads and traffic pressure.

Fourth, the smooth inner wall has a low friction coefficient, offering a flow capacity up to 30% higher than concrete pipes of the same diameter.

Fifth, they are resistant to acid and alkali corrosion, with a service life exceeding 50 years, resulting in lower lifecycle costs.

Jianlong's HDPE drainage pipes have passed SGS testing, and we provide complete engineering design solutions, making them an ideal upgrade replacement for traditional concrete pipes.

As a plastic pipe manufacturer, what types of pipes does Jianlong mainly supply?

As a professional plastic pipe manufacturer, Jianlong Plastic Pipe Co., Ltd. specializes in a core product line that includes: HDPE water supply and drainage pipes (for municipal water supply and drainage projects), PVC-U building drainage pipes (for building sewage systems), PP-R cold and hot water pipes (for indoor building water conveyance), PE-RT underfloor heating pipes (for radiant floor heating systems), and MPP power cable conduit (for power and telecommunication engineering).

All our plastic pipes and fittings are produced under the strict ISO9001 Quality Management System, ensuring compliance with GB/T National Standards and ISO International Standards. We offer a complete series of products, from HDPE double-wall corrugated pipes (with ring stiffness SN8-SN16) to small-diameter PP-R pipes (DN20-DN110), meeting fluid transport needs in municipal, construction, industrial, and agricultural sectors.

What international certifications do Jianlong's HDPE pipes, PP-R pipes, and other products hold? What is the significance of these certifications for buyers?

Our certification system comprehensively covers major plastic pipe product lines. HDPE water and drainage pipes hold ISO9001 (Quality Management), ISO14001 (Environmental Management), and the PED 2014/68/EU (Pressure Equipment Directive) certificates, ensuring their suitability for EU drinking water projects. PP-R cold and hot water pipes have German DVGW and UK WRAS water contact approvals.

PVC-U drainage pipes comply with the Chinese GB/T 5836 standard and come with SGS formaldehyde emission test reports. PE-RT underfloor heating pipes possess Swiss SGS long-term hydrostatic strength test certification (110°C/8760 hours). These certificates are not only a technical endorsement for a plastic pipe manufacturer but also significantly assist overseas buyers (e.g., contractors in the Middle East, building material suppliers in Southeast Asia) in swiftly passing local project acceptance procedures.

The company has a comprehensive range of products and a complete range of pipes and fittings, and can provide customers with one-stop, all-round pipeline customization and production and sales supply.

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Contact: Manager Wang

Tel: +86 17860052961

E-mail: jianlongplastic@gmail.com

Address: Jinger Road, Jiaoshan Town, Ju County, Rizhao City, Shandong Province