Connecting the world to gather in Laoshan and join hands in win-win situation in Shaohua---Qingdao Laoshan Pipe Industry Technology Co., Ltd. Annual Appreciation Meeting and 2020 Strategy Conference successfully concluded

Winter Construction Precautions for JRPP Low Temperature Impact: JRPP (jointless reinforced plastic pipe) materials may become brittle at low temperatures, increasing the risk of cracking during transportation, handling, and installation. Pre-construction Inspection: Check pipes and fittings for any signs of damage, such as cracks, dents, or deformation caused by cold weather. Thawing Requirements: If materials are frozen or covered with ice, allow them to thaw naturally in a protected environment before use. Installation Temperature: Avoid installing JRPP when ambient or ground temperatures are too low (follow manufacturer recommendations, typically above 0°C or as specified). Trench Preparation: Ensure trenches are free of frozen soil, ice, or snow. Frozen subgrade should be removed and replaced with suitable backfill material. Backfilling: Use granular, unfrozen backfill material. Avoid using frozen clods or large ice chunks, which can cause uneven settlement and damage to the pipe. Sealing and Connection: Pay special attention to joint sealing. Cold temperatures can affect the performance of adhesives or sealing materials; use products suitable for winter conditions. Protection After Installation: Cover exposed pipes to prevent freezing and damage from construction activities. Product Storage Issues in Winter Storage Environment: Store JRPP in a dry, covered area protected from direct sunlight, rain, snow, and extreme cold. Avoid leaving materials outdoors for extended periods. Temperature Control: If possible, maintain a moderate storage temperature to prevent material embrittlement. Avoid storing near heat sources that could cause thermal stress. Stacking and Handling: Use proper stacking methods to prevent deformation. Avoid dropping or rough handling, as low temperatures increase the risk of cracking. Packaging Protection: Keep original packaging intact to protect against moisture and physical damage. Inventory Management: Rotate stock to ensure older materials are used first, reducing the risk of degradation from long-term winter storage. Risk Mitigation and Recommendations Develop a winter construction plan specific to JRPP, including temperature monitoring and material handling procedures. Train construction personnel on winter installation techniques and the proper use of cold-weather compatible adhesives and sealants. Maintain close communication with suppliers to ensure materials are shipped and stored under appropriate conditions. Conduct regular inspections of stored and installed materials to identify potential issues early. By following these precautions and addressing storage issues, the performance and longevity of JRPP in winter construction projects can be significantly improved.

The core of winter construction for JRPP (reinforced polypropylene) pipes lies in avoiding low-temperature brittleness, ensuring fusion quality, and implementing effective anti-freezing and protective measures. Below are the key considerations by phase, balancing material properties and construction standards. 1. Pre-construction Preparation Material Storage and Preprocessing Pipes and fittings should be stored in warehouses or simple sheds, avoiding exposure to freezing temperatures and direct sunlight outdoors. The stacking height should be ≤1.5m to prevent deformation from heavy pressure. Do not throw, drop, roll, or drag during handling to avoid hidden damage. If there is a significant temperature difference between the site and the storage location, place the pipes and fittings at the site for more than 24 hours before installation to allow their temperature to approach the construction environment, thereby reducing potential connection hazards caused by thermal expansion and contraction. Before construction, inspect each pipe individually and remove those with stress-induced whitening, scratches, or internal wall damage to eliminate hidden defects. Environmental and Personnel Control When the ambient temperature falls below 5°C, warming and insulation measures (such as building insulated sheds or using air heaters) must be taken. Below 0°C, outdoor construction should be minimized, and operations must be suspended during rainy, snowy, or windy weather to prevent joint moisture or brittle cracking of pipes. Construction personnel must undergo specialized training to become familiar with the adjustment of hot-melt/electric-melt parameters and emergency handling procedures at low temperatures. Preparation of Tools and Auxiliary Materials Inspect specialized tools such as hot melt/electric melt welders and cutting machines to ensure they are functioning properly. Prepare auxiliary materials including anhydrous ethanol, fine sandpaper, insulation materials, and sand. Prepare windproof, rainproof, and thermal insulation facilities, such as thermal blankets and tarps, to avoid interference from environmental factors during the welding process. II. Construction Process Control

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