Polyethylene piping’s performance in mining, dredging and similar applications proves it can outwear more costly piping materials when conveying many different abrasive slurries. HDPE has excellent corrosion resistance and is virtually inert. It will not require expensive maintenance or cathodic protection. It provides better overall potential to deal with corrosive acids, bases and salts than most piping materials. In addition, polyethylene is unaffected by bacteria, fungi and also the most “aggressive” naturally sourced soils. It provides good effectiveness against many organic substances, for example 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 on the same pressure. They have less drag along with 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 pipe service life.
Polyethylene pipe is produced in straight lengths or even in coils. Made out of materials about one-eighth the density of steel, it 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 consequences of freezing and allows bending without making use of an excessive number 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 resistant against damage a result of external loads, vibrations, and from pressure surges including water hammer. Even just in cold temperatures polyethylene pipe is tolerant to handling and bending.
Polyethylene pipe can be purchased in an array of diameters and wall thickness, with flanges, elbows, tees, wyes, and valves, providing a total system solution. HDPE pipe can also be available in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) as well as metric sizes. Plastic Pipe Institute members can provide pipe, fittings along with other appurtenances.
Polyethylene pipe is offered with color coding by application as created by the utility location and coordination council of your American Public Works Association (APWA).
As part of its sewer rehab project, the city of Baytown, Texas, elected to use 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 HDPE pipe fittings rescues Colorado highway Each time a part of corrugated metal pipe culvert rusted and washed out, a busy Colorado highway was partially closed down to traffic.
The Colorado Department of Transportation acted quickly to line the culvert with polyethylene pipe. Its lightweight and durability were great for the project’s high elevation and isolated location. The line pipe was inserted through the uphill side in the culvert and pulled into position, then this joints were
assembled. Filling the annular void space involving 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 every day and threatening to shut down the town ’s water supply. Complicating factors included water temperature that changed 30 degrees in a nutshell time periods and steep slopes in the position of the leak. Reducing the amount of pipe joints across 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 section of line extending within the steep slope to the flatland below.
The HDPE pipe solved the elevation and temperature of water problems, and allowed for rapid installation that avoided shutting off of the city’s main water supply to have an extended time frame. The fee for constructing long lengths of distribution piping deprives many r ural residents of safe h2o. Carlsbad Springs in Ontario, Canada studied a stable – flow water supply technology and chain trencher installations method, discovering they may save 66% over conventional water supply installations. Although high-density polyethylene pipe was not in the standards for watermain materials, an assessment in the material and appropriate jointing methods determined HDPE pipe was flexible, immune 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 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 entire sewage system, the very best solution was to install two new parallel polyethylene pipelines 15 feet below the base of the canal. Laying the pipe involved complicated directional drilling with a vertical curve by 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 MLCP Pipe that met the criteria for pullback, ability to bend as well as withstand the strain of horizontal directional drilling. Excavation and environmental impact were kept to a minimum, and also the project was carried out in 4 weeks, one-third enough time required for the normal trench-digging operation, at a total cost of $2.4 million.
Since its founding in 1950, PPI has been the voice for the members who are involved in manufacturing and distributing polyethylene pipe systems. Members share an interest in educating industry about the key benefits of HDPEm pipe, and broadening market the opportunity 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.