Polyethylene piping’s performance in mining, dredging and other applications proves it will outwear much more costly piping materials when conveying many different abrasive slurries. HDPE has excellent corrosion resistance and is also virtually inert. It will not require expensive maintenance or cathodic protection. It provides better overall effectiveness against corrosive acids, bases and salts than most piping materials. Additionally, polyethylene is unaffected by bacteria, fungi and the most “aggressive” natural soils. It has 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 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 outstanding hydraulic characteristics throughout the pipe service life.
Polyethylene pipe is made in straight lengths or even in coils. Made from materials about one-eighth the density of steel, it really is lightweight and will not require using heavy lifting equipment for installation. It reduces the requirement for fittings, is e xcellent in shifting soils and performs well in earthquake-prone areas. HDPE resists the impact of freezing and allows bending without making use of an excessive variety of fittings. Since HDPE will not be a brittle material, it could 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 a result of external loads, vibrations, and from pressure surges for example water hammer. Even during cold temperatures polyethylene pipe is tolerant to handling and bending.
Polyethylene pipe comes in a variety of diameters and wall thickness, with flanges, elbows, tees, wyes, and valves, providing an overall system solution. HDPE pipe can also be offered in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) and also metric sizes. Plastic Pipe Institute members are able to provide pipe, fittings and also other appurtenances.
Polyethylene pipe is available with color coding by application as designed by the utility location and coordination council of the American Public Works Association (APWA).
Within its sewer rehab project, the area of Baytown, Texas, elected to work with 36-inch HDPE pipe to switch 36-inch Reinforced Concrete Pipe (RCP) sewer lines. To burst over 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 prevent the most important impact of bypass pumping and reduced flow capacity involved. Sliplining HDPE pipe fittings rescues Colorado highway Whenever a portion of corrugated metal pipe culvert rusted and washed out, an active Colorado highway was partially closed right down to 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 in the uphill side in the culvert and pulled into position, then a joints were
assembled. Filling the annular void space involving the existing Corrugated Metal Pipe (CMP) and the liner pipe with grout was challenging, but successful. The liner and direct bury portions are 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 water each day and threatening to turn off the metropolis ’s water supply. Complicating factors included water temperature that changed 30 degrees in a nutshell periods of time and steep slopes in the positioning of the leak. Reducing the quantity of pipe joints across the slope and accommodating the temperature differential, together with 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 portion of line extending within 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 off the city’s main water supply to have an extended period of time. The price of 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 might save 66% over conventional water supply installations. Although high-density polyethylene pipe was not within the standards for watermain materials, an assessment of the material and appropriate jointing methods determined HDPE pipe was flexible, proof against 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 lot of raw sewage from dumping into San Francisco Bay. A pipeline constructed within the 40s to transfer sewage and groundwater was rusting and corroding, along with inside sedimentary buildup that decreased its capacity significantly. Without replacing the entire sewage system, the ideal 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 in a vertical curve having a 38dexspky of tight maneuvers, with 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, power to bend as well as to withstand the strain of horizontal directional drilling. Excavation and environmental impact were kept to a minimum, as well as the project was completed in a month, one-third the time required for the typical trench-digging operation, at a sum total of $2.4 million.
Since its founding in 1950, PPI has become the voice for its members who take part in manufacturing and distributing polyethylene pipe systems. Members share an interest in educating industry about the advantages 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.