PP Formed Ductwork

Product Model	PP-F Series (Multiple Specifications)
Category	PP Molded Products
Reference Price	Price on request

Hot Customizable for Working Conditions 13 Technical Parameters

Product Overview

PP Formed Ducting is a commonly used material for ventilation pipes in exhaust gas treatment equipment, primarily used to collect polluted exhaust gas and transport it through ducts to exhaust gas treatment devices to reduce harmful gas concentrations. Xicheng Environmental Protection offers direct factory sales of PP ducting, including flame-retardant ducts, ventilation pipes, plastic pipes, and formed pipes. With a wide variety of products, full specifications, and large-scale production, procurement is worry-free and efficient. The product is extruded as a single piece using PP/PPs flame-retardant polypropylene material, featuring smooth inner walls, low wind resistance, and corrosion resistance to acids and alkalis. The choice of PP material over traditional galvanized iron or PVC is due to PP's excellent corrosion resistance to inorganic acids, alkalis, and salts. Long-term transportation of acidic or alkaline exhaust gas will not cause rusting or perforation like iron, nor will it release harmful substances like PVC under high temperatures. Additionally, PP is non-toxic, odorless, and recyclable, meeting environmental requirements, making it an ideal choice for exhaust ventilation systems in industries such as chemical, electronics, and coating.

Working Principle

PP Formed Ducting in the exhaust gas treatment system is responsible for exhaust gas collection and transportation. Exhaust gas is collected by hoods or air inlets and transported through PP ducting to exhaust gas treatment devices such as spray towers and activated carbon adsorption towers for purification. The purified gas is then discharged through the ducting by a fan into an exhaust stack. The smooth inner walls of the ducting minimize airflow resistance, effectively reducing fan energy consumption. The PP material is corrosion-resistant and acid/alkali-resistant, making it suitable for transporting corrosive gases and resistant to aging and deformation over long-term use.

Structural Composition

PP Formed Ducting mainly consists of the duct body, flange connection ends, and sealing components. The duct body is produced using a single-extrusion process, ensuring uniform wall thickness and smooth inner walls, which minimize airflow resistance and noise. Compared to traditional manually welded ducts, the seamless, single-extrusion ducts eliminate weld protrusions, preventing eddy currents and dust accumulation. Connection methods include slip-fit or flange connections. Slip-fit connections are suitable for small and medium pipe diameters due to their ease of installation, while flange connections provide secure and reliable connections with excellent sealing performance for larger diameters. Supporting fittings include elbows, tees, reducers, and dampers, which can be assembled into a complete ventilation pipeline system. All fittings are made of the same material as the duct, with the same coefficient of thermal expansion, ensuring no loosening or leakage due to temperature changes after connection. The product is available in both circular and square cross-sectional forms, allowing selection based on site space and airflow requirements. Large-diameter ducts can be processed using sheet welding.

Comparison Between Formed and Processed Ducting

PP Ducting is available in two types: formed and processed. Formed ducting is produced using an extrusion process, offering uniform wall thickness, smooth inner walls, low wind resistance, and high production efficiency, making it suitable for standard specifications and bulk use. Processed ducting is welded from PP flame-retardant sheets and reinforced with flanges, suitable for large diameters, non-standard sizes, and special shapes. Both types share the same material, providing corrosion and acid/alkali resistance, and can be selected based on pipe diameter and site requirements. Standard specifications and small-to-medium diameter branch and sub-ducts are preferably formed ducting, offering high production efficiency, low cost, and smooth inner walls with low wind resistance. Processed ducting is more flexible but slightly more expensive, suitable for large diameters, non-standard sizes, or special shapes where site space is limited. Circular ducts have low wind resistance and save materials, making them ideal for long-distance transportation. Square ducts are suitable for ceiling or wall-mounted installations in space-constrained areas, allowing flexible selection based on site conditions.

Specification Model Table

Configuration Item	Available Range	Description
Main Material	PP/PPs Flame-Retardant	Corrosion-resistant to acids and alkalis
Forming Method	Single-Extrusion	Uniform wall thickness
Duct Shape	Circular/Square	Choose based on site space
Connection Method	Slip-Fit/Flange	Choose based on pipe diameter
Flame-Retardant Rating	Standard PP/V0 Grade PPs	Choose based on safety requirements
Specification Range	Various Specifications	Customizable
Supporting Fittings	Elbows/Tees/Reducers/Dampers	Complete set supply

The above are standard configuration items. Multiple specifications are in stock, and special dimensions are supported for customization. Specific specifications are designed and confirmed by technical personnel based on site conditions, airflow requirements, and space constraints.

Product Features

Uses PP/PPs flame-retardant polypropylene, acid/alkali-resistant, UV-resistant, and flame-retardant
Single-extrusion forming, uniform wall thickness, smooth inner walls, low wind resistance
Wide variety of products and full specifications, circular and square options available, convenient procurement
Slip-fit or flange connections, easy installation, and excellent sealing performance
Supporting fittings include elbows, tees, reducers, and dampers, complete set supply
Non-toxic, hygienic, and recyclable, environmentally friendly, long service life

主体材质	PP/PPs 阻燃聚丙烯
成型方式	挤出一体成型
管材形状	圆形/方形
连接方式	承插/法兰连接
阻燃等级	普通 PP/V0 级 PPs 阻燃
主要用途	废气通风管道
适用介质	腐蚀性气体、酸碱废气
板材特性	防腐、耐酸碱、抗 UV、阻燃
规格范围	多种规格
配套管件	弯头、三通、变径、风阀
安装方式	室内外均可
固定方式	支架固定
环保特性	无毒、可回收利用

Application Industries

Corrosive gas conveying pipelines in chemical and pharmaceutical industries
Clean air ventilation pipelines in electronics and semiconductor industries
Waste gas collection and conveying pipelines in painting and coating industries
Ink solvent waste gas pipelines in printing and packaging industries
Ventilation and exhaust pipelines in food processing industries
Exhaust pipelines for fume hoods in laboratories and testing institutions
Anti-acid and corrosion-resistant ventilation pipelines in environmental pollution projects

Typical Process Locations

In typical waste gas treatment processes, PP formed ducts are used to connect gas transportation between various equipment. After waste gas is collected by hoods or air inlets, it is transported through PP formed ducts to PP spray towers or activated carbon adsorption towers for purification treatment. The purified gas is then discharged into exhaust stacks via PP ducts and PP fans. The duct system requires matching PP elbows, tees, reducers, and dampers, with the pipeline layout designed based on site space and air volume requirements. Xicheng Environmental can provide complete products and solution design services for ducts, fittings, fans, and waste gas treatment equipment. When designing the duct system, it is essential to reasonably control the air velocity. The main duct velocity should generally be kept within the economic flow range. Excessive velocity increases resistance and noise, while insufficient velocity leads to larger duct diameters and higher costs. The pipeline layout should minimize elbows and reducers to reduce local resistance. Additionally, inspection and testing ports should be reserved for convenient daily maintenance and air volume balancing adjustments.

The PP formed duct is made of PP polypropylene or PPs flame-retardant polypropylene material. The PP material features excellent chemical corrosion resistance, showing good corrosion resistance to inorganic acids, alkalis, and salts. It also has a low density, is easy to weld and process, exhibits good heat resistance and impact resistance, and is non-toxic and odorless, making it one of the engineering plastics that meet environmental protection requirements. The PPs flame-retardant material enhances the flame-retardant properties based on the PP base, making it suitable for applications with higher fire safety requirements. It can be selected according to the usage environment.

The main differences lie in the manufacturing process and applicable scenarios. Formed ducts are produced using an extrusion process, resulting in uniform wall thickness, smooth inner surfaces, low air resistance, and high production efficiency, making them suitable for standard specifications and large-volume production. Machined ducts are fabricated from PP flame-retardant sheets through welding, with flange reinforcement, making them ideal for large diameters, non-standard dimensions, and special-shaped ducts. They offer high flexibility but relatively lower production efficiency. Both materials are corrosion-resistant and acid/alkali-resistant. Standard branch ducts are recommended for formed ducts, while large-diameter main pipelines are suitable for machined ducts.

PP ducting is primarily used for conveying corrosive gases and acid-base exhaust fumes, such as hydrogen chloride, hydrogen fluoride, ammonia gas, sulfuric acid mist, and other water-soluble gases, as well as organic exhaust fumes and dust exhaust fumes. The PP material is resistant to acid and alkali corrosion, making it suitable for exhaust gas transportation in industries such as chemical, electronics, and coating. For high-temperature gases, it is necessary to confirm that the temperature is within the temperature resistance range of the PP material; for gases with a high concentration of organic solvents, material compatibility should be evaluated, and alternative materials or additional protective measures should be selected if necessary.

PP ducts primarily use two connection methods: spigot connection and flange connection. Spigot connection involves inserting one end of the duct into the socket of another duct or fitting, sealed with sealant or a gasket, offering easy installation and suitability for medium and small diameters. Flange connection involves welding flanges at both ends of the duct, connecting the two flanges with bolts and adding a sealant pad, providing excellent sealing performance and secure connection, ideal for large diameters and applications requiring frequent disassembly. The specific connection method should be selected based on diameter, pressure, and maintenance needs. Before installation, check if the pipe ends are flat and, if necessary, use sandpaper to smooth them for easy insertion.

PP Formed Ducts Offer a Wide Variety of Models and Full Specifications, with Two Cross-Sectional Forms: Circular and Square. The Pipe Diameters Cover Multiple Standard Sizes and Can Be Customized Non-Standard According to Customer Requirements. Specific Specifications Need to Be Determined Based on Airflow Processing, Wind Speed Requirements, and On-Site Space. Generally, Main Pipes Have Larger Diameters, While Branch Pipes Have Smaller Diameters. Xicheng Environmental Can Provide a Full Range of Ducts from Standard Small Diameters to Large Diameters, as Well as Matching Components Such as Bends, T-Joints, Conical Ducts, and Air Valves, Offering Complete Supply for Hassle-Free Procurement. If Uncertain About Required Specifications, Technical Personnel Can Calculate the Pipe Diameter Based on Airflow Processing and Design Wind Speed.

PP ducts and PVC ducts each have their own characteristics. PP ducts offer better temperature resistance, excellent chemical corrosion resistance, good flexibility, and are non-toxic and recyclable, making them suitable for conveying acidic, alkaline, and slightly temperature-raised gases. PVC ducts are more cost-effective and have good rigidity, but their temperature resistance and corrosion resistance are relatively weaker, and they may produce harmful gases when burning. In the field of exhaust gas treatment, especially when conveying corrosive acidic and alkaline exhaust gases, PP ducts are more commonly used and reliable. The specific choice should be comprehensively considered based on the composition of the exhaust gas, temperature, and budget.

When installing PP ducts, the following points should be noted: First, the spacing of pipe supports should be reasonable to prevent pipe sagging and deformation; Second, the connection joints should be well-sealed to prevent exhaust gas leakage; Third, the pipes should have a certain slope for convenient condensate drainage; Fourth, avoid contact with sharp objects to prevent scratching the pipe wall; Fifth, for outdoor installation, avoid direct sunlight or take shading measures to delay aging; Sixth, when connecting the duct to the fan or equipment, set up a flexible connection to reduce vibration transmission. After installation, an air leakage test should be conducted to ensure system sealing.

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