Polyethylene piping’s performance in mining, dredging and other applications proves it is going to outwear more costly piping materials when conveying various abrasive slurries. HDPE has excellent corrosion resistance and is also virtually inert. It does not require expensive maintenance or cathodic protection. It includes better overall resistance to corrosive acids, bases and salts than most piping materials. Additionally, polyethylene is unaffected by bacteria, fungi and the most “aggressive” naturally occurring soils. It has good potential to deal with many organic substances, such as solvents and fuels.
Because polyethylene is smoother than steel, cast iron, ductile iron, or concrete, HDPE pipe fittings can hold an equivalent volumetric flow rate in the same pressure. It has less drag and 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 superb hydraulic characteristics through the entire pipe service life.
Polyethylene pipe is created in straight lengths or maybe in coils. Made out of materials about one-eighth the density of steel, it can be lightweight and will not require the usage of heavy lifting equipment for installation. It reduces 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 variety of fittings. Since HDPE is not a brittle material, it might 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 resistant to damage brought on by external loads, vibrations, and from pressure surges such as water hammer. In freezing weather polyethylene pipe is tolerant to handling and bending.
Polyethylene pipe can be found in a wide range of diameters and wall thickness, with flanges, elbows, tees, wyes, and valves, providing an overall system solution. HDPE pipe is additionally offered in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) along with metric sizes. Plastic Pipe Institute members are able to provide pipe, fittings and other appurtenances.
Polyethylene pipe is offered with color coding by application as produced by the utility location and coordination council from the American Public Works Association (APWA).
As an element of its sewer rehab project, the city of Baytown, Texas, elected to work with 36-inch HDPE pipe to replace 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 protect yourself from the main impact of bypass pumping and reduced flow capacity involved. Sliplining HDPE butt fusion fittings rescues Colorado highway Whenever a section of corrugated metal pipe culvert rusted and washed out, an active 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 light weight and durability were great for the project’s high elevation and isolated location. The fishing line pipe was inserted from the uphill side of your culvert and pulled into position, then the joints were
assembled. Filling the annular void space 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 have been in place, with flow restored and traffic running normally on the highway above it.
A deteriorating cast iron water main in Henryetta, Oklahoma was leaking 300,000 gallons water daily and threatening to shut down the metropolis ’s water supply. Complicating factors included temperature of water that changed 30 degrees in short periods of time and steep slopes in the position of the leak. Reducing the amount of pipe joints down the slope and accommodating the temperature differential, as well as elevation problems, convinced city officials to choose HDPE pipe. Fourteen-inch Iron Pipe Size (IPS) DR-11 water pipe was installed along the 1,400-foot area of line extending over the steep slope for the flatland below.
The HDPE pipe solved the elevation and water temperature problems, and allowed for rapid installation that avoided shutting off of the city’s main water supply on an extended period of time. The price of constructing long lengths of distribution piping deprives many r ural residents of safe drinking water. 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 inside the standards for watermain materials, an assessment of the 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 ranging from 75mm to 200mm (3 inch to 8 inch) diameter. Using HDPE and chain trenching excavation, watermain installation costs were only $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 plenty of raw sewage from dumping into San Francisco Bay. A pipeline constructed from the 40s to transfer sewage and groundwater was rusting and corroding, and had inside sedimentary buildup that decreased its capacity significantly. Without replacing the whole sewage system, the very best solution would be to install two new parallel polyethylene pipelines 15 feet below the base of the canal. Laying the pipe involved complicated directional drilling at the vertical curve using 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 PEX-AL-PEX pipe that met the criteria for pullback, power to bend and also to withstand the strain of horizontal directional drilling. Excavation and environmental impact were kept as low as possible, and the project was carried out 4 weeks, one-third enough time essential for the typical trench-digging operation, in a total price of $2.4 million.
Since its founding in 1950, PPI continues to be the voice for its members who are involved in manufacturing and distributing polyethylene pipe systems. Members share a desire for educating industry about the key benefits of HDPEm pipe, and broadening market possibilities 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.