Polyethylene piping’s performance in mining, dredging and other applications proves it is going to outwear many more costly piping materials when conveying a variety of abrasive slurries. HDPE has excellent corrosion resistance and it is virtually inert. It can not want expensive maintenance or cathodic protection. It offers better overall potential to deal with corrosive acids, bases and salts than most piping materials. Furthermore, polyethylene is unaffected by bacteria, fungi and also the most “aggressive” naturally occurring soils. They have good potential to deal with many organic substances, like solvents and fuels.
Because polyethylene is smoother than steel, cast iron, ductile iron, or concrete, HDPE pipe can have an equivalent volumetric flow rate with 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 just about eliminate scaling and pitting and preserve the excellent hydraulic characteristics through the entire pipe service life.
Polyethylene pipe is manufactured in straight lengths or maybe in coils. Produced from materials about one-eighth the density of steel, it is actually lightweight and fails to require the use 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 consequences of freezing and allows bending without the need for an excessive variety of fittings. Since HDPE is not really a brittle material, it can 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 brought on by external loads, vibrations, and from pressure surges for example water hammer. Even during winter weather polyethylene pipe is tolerant to handling and bending.
Polyethylene pipe comes in a wide range of diameters and wall thickness, with flanges, elbows, tees, wyes, and valves, providing a total system solution. HDPE pipe can also be offered in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) in addition to metric sizes. Plastic Pipe Institute members are able to provide pipe, fittings as well as other appurtenances.
Polyethylene pipe is accessible with color coding by application as produced by the utility location and coordination council of the American Public Works Association (APWA).
Included in its sewer rehab project, the city 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 avoid the most important impact of bypass pumping and reduced flow capacity involved. Sliplining HDPE butt fusion fittings rescues Colorado highway Each time a part of corrugated metal pipe culvert rusted and washed out, a lively Colorado highway was partially closed right down 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 fishing line pipe was inserted through the uphill side from the culvert and pulled into position, then a 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 will 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 each day and threatening to shut down the metropolis ’s water supply. Complicating factors included temperature of water that changed 30 degrees in short time periods and steep slopes in the location of the leak. Reducing the amount of pipe joints down the slope and accommodating the temperature differential, together with elevation problems, convinced city officials to select HDPE pipe. Fourteen-inch Iron Pipe Size (IPS) DR-11 water pipe was installed across the 1,400-foot area of line extending on 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 an extended length of time. The expense of constructing long lengths of distribution piping deprives many r ural residents of safe h2o. 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 was not within the standards for watermain materials, an assessment from the material and appropriate jointing methods determined HDPE pipe was flexible, resistant 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 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 a lot 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 would be to install two new parallel polyethylene pipelines 15 feet below the foot 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, power to bend as well as withstand the stress of horizontal directional drilling. Excavation and environmental impact were kept to a minimum, and also the project was carried out 4 weeks, one-third enough time necessary 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 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 opportunities 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.