Polyethylene piping’s performance in mining, dredging and other applications proves it can outwear much more costly piping materials when conveying a number of abrasive slurries. HDPE has excellent corrosion resistance and it is virtually inert. It will not need expensive maintenance or cathodic protection. It gives you better overall effectiveness against corrosive acids, bases and salts than most piping materials. Additionally, polyethylene is unaffected by bacteria, fungi as well as the most “aggressive” naturally occurring soils. It offers good resistance to many organic substances, like solvents and fuels.
Because polyethylene is smoother than steel, cast iron, ductile iron, or concrete, HDPE pipe can carry an equivalent volumetric flow rate in the same pressure. It provides less drag as well as a lower tendency for turbulence at high flow. Its superior chemical resistance and “non-stick” surface combine to almost eliminate scaling and pitting and preserve the excellent hydraulic characteristics throughout the pipe service life.
Polyethylene pipe is produced in straight lengths or maybe in coils. Made from materials about one-eighth the density of steel, it really is lightweight and will not require the usage of heavy lifting equipment for installation. It cuts down on the demand for fittings, is e xcellent in shifting soils and performs well in earthquake-prone areas. HDPE resists the effects of freezing and allows bending without making use of an excessive quantity of fittings. Since HDPE is not really a brittle material, it may be installed with bends over uneven terrain easily in continuous lengths without additional welds or couplings.
Polyethylene pipe and fittings are inherently tough, resilient and proof against damage caused by external loads, vibrations, and from pressure surges like water hammer. Even just in winter weather polyethylene pipe is tolerant to handling and bending.
Polyethylene pipe can be found in a wide array of diameters and wall thickness, with flanges, elbows, tees, wyes, and valves, providing an absolute system solution. HDPE pipe is also available in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) as well as metric sizes. Plastic Pipe Institute members can provide pipe, fittings as well as other appurtenances.
Polyethylene pipe is offered with color coding by application as developed by the utility location and coordination council in the American Public Works Association (APWA).
Within its sewer rehab project, the city of Baytown, Texas, elected to work with 36-inch HDPE pipe to exchange 36-inch Reinforced Concrete Pipe (RCP) sewer lines. To burst more than 3700 feet of pipe in residential areas, the contractor used both static and pneumatic bursting systems. The pipe bursting method was recommended over three other procedures to avoid the major impact of bypass pumping and reduced flow capacity involved. Sliplining Poly fittings rescues Colorado highway Each time a section of corrugated metal pipe culvert rusted and washed out, a busy Colorado highway was partially closed as a result of traffic.
The Colorado Department of Transportation acted quickly to line the culvert with polyethylene pipe. Its very light and durability were ideal for the project’s high elevation and isolated location. The line pipe was inserted from the uphill side from the culvert and pulled into position, then this joints were
assembled. Filling the annular void space in between the existing Corrugated Metal Pipe (CMP) as well as the liner pipe with grout was challenging, but successful. The liner and direct bury portions will be in place, with flow restored and traffic running normally on the road above it.
A deteriorating cast iron water main in Henryetta, Oklahoma was leaking 300,000 gallons of water each day and threatening to shut down the town ’s water supply. Complicating factors included temperature of water that changed 30 degrees in short time periods and steep slopes in the positioning of the leak. Reducing the volume of pipe joints down the slope and accommodating the temperature differential, along with elevation problems, convinced city officials to pick HDPE pipe. Fourteen-inch Iron Pipe Size (IPS) DR-11 water pipe was installed down the 1,400-foot section of line extending across the steep slope on the flatland below.
The HDPE pipe solved the elevation and temperature of water problems, and allowed for rapid installation that avoided shutting away from the city’s main water supply on an extended time frame. The fee for constructing long lengths of distribution piping deprives many r ural residents of safe water to drink. Carlsbad Springs in Ontario, Canada studied a reliable – flow water supply technology and chain trencher installations method, discovering they could save 66% over conventional water supply installations. Although high-density polyethylene pipe was not within the standards for watermain materials, an assessment of your material and appropriate jointing methods determined HDPE pipe was flexible, resistant to corrosion and smooth-walled. Carlsbad Springs installed approximately 33.5km (20.8mi.) of HDPE watermain starting from 75mm to 200mm (3 inch to 8 inch) diameter. Using HDPE and chain trenching excavation, watermain installation costs were as low as $15 per foot for 6-inch diameter pipe.
A nightmare situation faced the San Rafael, California Sanitation District.Few challenging environmental demands can compare with preventing a great deal of raw sewage from dumping into San Francisco Bay. A pipeline constructed inside the 40s to transfer sewage and groundwater was rusting and corroding, along with inside sedimentary buildup that decreased its capacity significantly. Without replacing the complete sewage system, the ideal solution ended up being to install two new parallel polyethylene pipelines 15 feet below the foot of the canal. Laying the pipe involved complicated directional drilling at a vertical curve having a 38dexspky of tight maneuvers, by using a compound curve around private property, and without disturbing the nearby wetlands. The project utilized 16-inch SDR- 11 and 26-inch Multilayer pipe that met the criteria for pullback, ability to bend and also to withstand the anxiety of horizontal directional drilling. Excavation and environmental impact were kept as low as possible, and also the project was finished in a month, one-third enough time necessary for the standard trench-digging operation, at the total cost of $2.4 million.
Since its founding in 1950, PPI has been the voice due to its members who are involved in manufacturing and distributing polyethylene pipe systems. Members share an interest in educating industry about the advantages of HDPEm pipe, and broadening market opportunities to use polyethylene piping systems for water and gas distribution, sewer and wastewater, oil and gas production, industrial and mining uses, power and communication duct, and ir rigation.