The smart water-fertilizer integrated machine requires a complete intelligent water-fertilizer system—a comprehensive irrigation and fertilization system designed for both open fields and greenhouses. It works by detecting the nutrient content and pH level of the irrigation solution, then using the PID control system to precisely calculate and release different concentrated fertilizer solutions.

Here's a comparison of the features and main applications of several types of plastic pipes: --- **PVC Pipes** These pipes exhibit good tensile and compressive strength, though they are less flexible than other plastic pipes. They offer excellent corrosion resistance and are relatively inexpensive compared to other types of plastic pipes. However, they tend to become brittle at low temperatures. Common applications include water supply and drainage systems for residential, industrial, agricultural, and irrigation purposes, as well as gas and ventilation systems. They’re also used for electrical conduit, rainwater drainage, and industrial anti-corrosion pipelines. --- **CPVC Pipes** CPVC pipes stand out for their exceptional heat resistance, with a heat distortion temperature of up to 100°C. They also boast outstanding chemical resistance, making them ideal for hot-water piping systems connected via adhesive bonding or flanged threaded joints. --- **PE Pipes** Lightweight and highly flexible, PE pipes perform exceptionally well in low-temperature conditions while remaining cost-effective. They offer superior impact resistance but have lower tensile and compressive strength. These pipes are typically joined using thermal fusion welding or flanged threaded connections and are widely used for drinking water supply, rainwater drainage, gas pipelines, and industrial anti-corrosion systems. --- **PP Pipes** PP pipes excel in corrosion resistance, offering high strength, excellent surface hardness, and smooth finishes. They also possess moderate heat resistance, making them suitable for thermal fusion welding or flanged threaded connections. These pipes are commonly employed in chemical wastewater systems, seawater and oil pipelines, irrigation networks, and even as heating conduits in indoor concrete floor heating systems. --- **ABS Pipes** ABS pipes provide excellent corrosion resistance and are notably lightweight. They can withstand higher temperatures than both PE and PVC, though they come at a premium price. These pipes are typically joined using adhesive bonding or flanged threaded connections and are ideal for applications such as sewer lines in sanitary fixtures, fluid transport systems, sewage pipelines, underground cable conduits, and highly corrosive industrial pipelines. --- **PB Pipes** PB pipes strike a balance between the properties of PE and PP, offering intermediate strength and flexibility—somewhere between LDPE and HDPE. One of their standout features is their remarkable resistance to creep (cold deformation), allowing them to maintain structural integrity even after repeated bending and coiling. Additionally, PB pipes exhibit excellent thermal and chemical resistance, making them perfect for thermal fusion welding or flanged threaded connections. They are widely used in potable water systems, cold and hot water distribution, gas pipelines, and large-diameter underground installations. --- **GRP Pipes** GRP pipes combine superior corrosion resistance with lightweight construction, high strength, and excellent design flexibility. They are typically joined using spigot-and-socket connections with rubber gaskets or flanged joints, making them ideal for use in petrochemical pipelines and large-diameter water supply and drainage systems.

Looking back at the smooth destocking process in the second quarter, we initially faced significant inventory buildup following the Spring Festival. At the same time, supply reached a robust 4.8 million tons—its highest level of the year. Yet by the end of the quarter, companies had successfully reduced their inventories to effective levels. In July, sample inventories in East and South China remained near the year’s lowest point, hovering around 200,000 tons, while both PVC producers and downstream manufacturers also maintained low stock levels. The ability to reduce inventories despite high supply suggests that demand in the second quarter was strong, with supply slightly constrained.

"PE Water Pipes" comply with the national product standard: (GB/T 13663-2000) "Polyethylene (PE) Pipeline Systems for Water Supply" 1. Introduction to PE Water Pipes: PE (polyethylene) material is widely used in the manufacturing of water pipes due to its high strength, excellent corrosion resistance, and non-toxic properties. 2. Advantages of PE Water Pipes: (1) They offer outstanding corrosion resistance, superior hygiene performance, and a remarkably long service life. (2) These pipes possess unique flexibility and exceptional scratch resistance. (3) They exhibit outstanding low-temperature performance, making them ideal for colder climates. (4) They also demonstrate excellent resistance to rapid crack growth and fracture toughness. 3. Storage Guidelines for PE Water Pipes: (1) Store the pipes in a shed or well-ventilated warehouse where temperatures do not exceed 40°C. (2) Stack the pipes on flat, stable supports or directly on the ground. (Note: Avoid stacking higher than 1.5 meters.) (3) When storing outdoors, ensure the pipes are covered to protect them from the elements. (4) Separate pipes of different diameters and wall thicknesses during storage. Color Municipal drinking water pipes are typically blue or black, with blue color bands co-extruded onto black pipes. Each pipe should have at least three longitudinal blue bands. Other types of water pipes may come in blue and black. However, pipes exposed to direct sunlight—such as above-ground installations—must be black. Appearance Both the inner and outer surfaces of the pipes must be clean and smooth, free from defects like bubbles, visible scratches, dents, impurities, or uneven coloring. The ends of the pipes should be cut cleanly and remain perpendicular to the pipe axis. Pipe Dimensions & Length Straight pipes are commonly available in lengths of 6m, 9m, and 12m, though custom lengths can be agreed upon by both supplier and buyer. The maximum allowable deviation in length is +0.4% for positive deviations and -0.2% for negative deviations. Coiled pipes must be wound around a spool with a diameter no less than 18 times the pipe’s outer diameter. The exact length of the coiled pipe after uncoiling will be determined through mutual agreement between the supplier and buyer. The static hydraulic strength of the pipes must meet the following criteria: Static Hydraulic Strength for PE100 Pipes: 1. At 20°C: 12.0 MPa—no rupture or leakage. 2. At 80°C: 5.4 MPa—no rupture or leakage. 3. At 80°C: 5.0 MPa—no rupture or leakage. For the 80°C static hydraulic strength test conducted over 165 hours, only brittle failure is considered. If ductile failure occurs within the specified time frame (165 hours), the lower failure stress value along with the corresponding minimum failure time must be retested. Physical Properties The physical properties of the pipes must adhere to specified standards. When recycled materials are incorporated into the compound during extrusion, the difference between the melt flow rate (MFR) measured for the finished pipe (using a 5 kg load at 190°C) and the MFR measured for the original compound should not exceed 25%. Key Physical Property Requirements for PE Pipes: 1. Short-term elongation at break: ≥350% 2. Longitudinal shrinkage at 110°C: ≤3% 3. Oxidation induction time at 220°C: ≥20 minutes Polyethylene offers excellent corrosion resistance, superior hygiene characteristics, and an exceptionally long service life. Polyethylene is inherently inert, resisting corrosion from most chemicals except for a few strong oxidizing agents. It is highly resistant to bacterial growth. In fact, plastic pipes have largely replaced steel and cast iron pipes because they consume less energy for water transportation and household use, are lighter in weight, provide lower flow resistance, allow for quicker and easier installation, boast lower costs, and enjoy extended lifespans. Additionally, plastic pipes excel in thermal insulation compared to their metal counterparts. The service life of polyethylene pipes is estimated to exceed 50 years, a claim that has been validated not only by international and advanced foreign standards but also confirmed through practical applications. Another compelling reason for the widespread adoption of polyethylene pipes is the growing environmental concerns surrounding PVC. First, there are questions regarding the inherent hygiene of PVC itself. While properly manufactured under strict quality control, PVC pipes can indeed meet hygienic standards suitable for potable water applications. However, concerns persist about potential contamination in areas with lax regulatory oversight—such as excessive levels of vinyl chloride monomer in PVC resins or the inadvertent use of toxic additives in formulations intended for drinking water systems. There’s also the risk of mistakenly using non-potable drainage-grade PVC pipes and fittings in potable water lines. Second, recycling PVC presents significant challenges. Like polyethylene, PVC is a thermoplastic material that, in theory, could be recycled. Yet, global experience shows that the proportion of post-consumer PVC products successfully recycled remains limited. Instead, most PVC waste ends up being incinerated to recover energy. Unfortunately, PVC contains chlorine, which can release harmful byproducts if incineration isn’t carefully controlled. In contrast, polyethylene produces only carbon dioxide and water when burned, making it a more environmentally friendly option. Installation Instructions: 1. Before bonding pipes and fittings, wipe both the socket end and the spigot exterior thoroughly with a dry cloth. If oil or grease is present, use acetone to clean the surfaces completely. 2. Ensure pipe ends are cut cleanly, perpendicular to the pipe axis, and chamfered appropriately. Before applying adhesive, mark the insertion depth and perform a trial fit. The trial insertion should extend only about one-third to one-half of the intended depth; never attempt to fully insert the pipe if the gap exceeds the recommended limit. 3. When applying the adhesive, first coat the inside of the socket, then the outside of the spigot. Apply the adhesive evenly along the socket’s interior, moving axially from the center outward. Avoid leaving any areas uncoated or applying excess adhesive (not exceeding 200 g/m²). 4. After applying the adhesive, maintain consistent external pressure for up to one minute to ensure proper alignment and positioning of the joint.5. After bonding is complete, promptly wipe away any excess adhesive that has been squeezed out. During the curing period, avoid applying any force or subjecting the joint to excessive loading. 6. Bonded joints must not be installed in rain or water, and operations should not be conducted at temperatures below 5°C. 7. Connection procedure: Preparation → Clean the working surface → Test fitting → Apply adhesive → Bond → Curing.