Polyethylene piping’s performance in mining, dredging and similar applications proves it can outwear many more costly piping materials when conveying a variety of abrasive slurries. HDPE has excellent corrosion resistance and is also virtually inert. It can not want 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 along with the most “aggressive” natural soils. It offers good resistance to many organic substances, such as solvents and fuels.
Because polyethylene is smoother than steel, cast iron, ductile iron, or concrete, HDPE pipe can hold an equivalent volumetric flow rate at the same pressure. It has less drag plus 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 through the pipe service life.
Polyethylene pipe is made in straight lengths or in coils. Produced from materials about one-eighth the density of steel, it is lightweight and will not require the use of heavy lifting equipment for installation. It cuts down on the necessity for fittings, is e xcellent in shifting soils and performs well in earthquake-prone areas. HDPE resists the results of freezing and allows bending without resorting to an excessive variety 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 such as water hammer. Even during cold weather polyethylene pipe is tolerant to handling and bending.
Polyethylene pipe can be found in an array of diameters and wall thickness, with flanges, elbows, tees, wyes, and valves, providing an absolute system solution. HDPE pipe is likewise obtainable in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) and also metric sizes. Plastic Pipe Institute members are able to provide pipe, fittings as well as other appurtenances.
Polyethylene pipe is available with color coding by application as designed by the utility location and coordination council of your American Public Works Association (APWA).
As part of its sewer rehab project, the town of Baytown, Texas, elected to utilize 36-inch HDPE pipe to change 36-inch Reinforced Concrete Pipe (RCP) sewer lines. To burst greater 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 most important impact of bypass pumping and reduced flow capacity involved. Sliplining Poly fittings rescues Colorado highway Each time a area 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 light weight and sturdiness were excellent for the project’s high elevation and isolated location. The fishing line pipe was inserted through the uphill side of the culvert and pulled into position, then this joints were
assembled. Filling the annular void space between your 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 highway above it.
A deteriorating cast iron water main in Henryetta, Oklahoma was leaking 300,000 gallons water every day and threatening to turn off the area ’s water supply. Complicating factors included temperature of water that changed 30 degrees simply speaking time periods and steep slopes in the location of the leak. Reducing the volume 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 over the 1,400-foot section of line extending over the steep slope towards 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 for the extended length of time. The cost 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 can save 66% over conventional water supply installations. Although high-density polyethylene pipe had not been from the standards for watermain materials, an assessment from 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 including 75mm to 200mm (3 inch to 8 inch) diameter. Using HDPE and chain trenching excavation, watermain installation costs were as little 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 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 most effective solution was 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 with 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 PEX-AL-PEX pipe that met the criteria for pullback, ability to bend as well as withstand the anxiety of horizontal directional drilling. Excavation and environmental impact were kept as low as possible, and also the project was carried out four weeks, one-third enough time needed for the standard trench-digging operation, in 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 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.