Polyethylene piping’s performance in mining, dredging and similar applications proves it will outwear many more costly piping materials when conveying a variety of abrasive slurries. HDPE has excellent corrosion resistance and it is virtually inert. It will not have expensive maintenance or cathodic protection. It offers better overall effectiveness against 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, including 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. 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 excellent hydraulic characteristics during the entire pipe service life.
Polyethylene pipe is created in straight lengths or perhaps in coils. Made out of materials about one-eighth the density of steel, it is actually 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 effects of freezing and allows bending without making use of an excessive variety of fittings. Since HDPE will not be 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 due to external loads, vibrations, and from pressure surges including water hammer. Even in freezing weather polyethylene pipe is tolerant to handling and bending.
Polyethylene pipe can be purchased in a wide array of diameters and wall thickness, with flanges, elbows, tees, wyes, and valves, providing an absolute system solution. HDPE pipe can also be offered in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) along with metric sizes. Plastic Pipe Institute members can provide pipe, fittings and other appurtenances.
Polyethylene pipe can be obtained with color coding by application as designed by the utility location and coordination council of the American Public Works Association (APWA).
As an element of its sewer rehab project, the town of Baytown, Texas, elected to utilize 36-inch HDPE pipe to exchange 36-inch Reinforced Concrete Pipe (RCP) sewer lines. To burst a lot 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 prevent the major impact of bypass pumping and reduced flow capacity involved. Sliplining HDPE pipe fittings rescues Colorado highway Every time a area of corrugated metal pipe culvert rusted and washed out, a lively Colorado highway was partially closed to traffic.
The Colorado Department of Transportation acted quickly to line the culvert with polyethylene pipe. Its lightweight and durability were perfect for the project’s high elevation and isolated location. The line pipe was inserted from your uphill side of your culvert and pulled into position, then the 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 happen to be 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 of water daily and threatening to shut off the area ’s water supply. Complicating factors included temperature of water that changed 30 degrees in a nutshell time periods and steep slopes in the location of the leak. Reducing the amount of pipe joints over the slope and accommodating the temperature differential, as well as elevation problems, convinced city officials to select HDPE pipe. Fourteen-inch Iron Pipe Size (IPS) DR-11 water pipe was installed over the 1,400-foot section of line extending on 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 of the city’s main water supply for the extended length of time. The fee for constructing long lengths of distribution piping deprives many r ural residents of safe water. Carlsbad Springs in Ontario, Canada studied a steady – 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 from the standards for watermain materials, an assessment from 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 which range 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 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 very best 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 with a vertical curve using a 38dexspky of tight maneuvers, having 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, ability to bend and also to withstand the strain of horizontal directional drilling. Excavation and environmental impact were kept as low as possible, as well as the project was carried out in 30 days, one-third enough time required for the average trench-digging operation, at a price tag of $2.4 million.
Since its founding in 1950, PPI has been the voice for its members who are involved in manufacturing and distributing polyethylene pipe systems. Members share a desire for educating industry about the benefits of HDPEm pipe, and broadening market chances 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.