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 it is virtually inert. It can not require expensive maintenance or cathodic protection. It provides better overall resistance to corrosive acids, bases and salts than most piping materials. Additionally, polyethylene is unaffected by bacteria, fungi and also the most “aggressive” natural soils. They have good potential to deal with many organic substances, for example solvents and fuels.
Because polyethylene is smoother than steel, cast iron, ductile iron, or concrete, Multilayer 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 outstanding hydraulic characteristics through the pipe service life.
Polyethylene pipe is made in straight lengths or in coils. Made out of materials about one-eighth the density of steel, it really is lightweight and will not require the application of heavy lifting equipment for installation. It cuts down on 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 the need for an excessive number of fittings. Since HDPE will not be 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 proof against damage a result of external loads, vibrations, and from pressure surges including water hammer. Even during cold 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 is likewise offered in Iron Pipe Size (IPS), Ductile Pipe Size (DIPS) along with metric sizes. Plastic Pipe Institute members are able to provide pipe, fittings along with other appurtenances.
Polyethylene pipe is accessible with color coding by application as designed by the utility location and coordination council in 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 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 protect yourself from the major impact of bypass pumping and reduced flow capacity involved. Sliplining HDPE pipe fittings rescues Colorado highway Every time a part of corrugated metal pipe culvert rusted and washed out, a hectic Colorado highway was partially closed down to traffic.
The Colorado Department of Transportation acted quickly to line the culvert with polyethylene pipe. Its very light and sturdiness were ideal for the project’s high elevation and isolated location. The line pipe was inserted through the uphill side from the culvert and pulled into position, then this joints were
assembled. Filling the annular void space between your 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 daily and threatening to shut off the metropolis ’s water supply. Complicating factors included temperature of water that changed 30 degrees simply speaking time periods and steep slopes in the position of the leak. Reducing the quantity of pipe joints down the slope and accommodating the temperature differential, in addition to 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 part of line extending across the steep slope for the flatland below.
The HDPE pipe solved the elevation and water temperature problems, and allowed for rapid installation that avoided shutting from the city’s main water supply to have an extended time period. The price 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 might save 66% over conventional water supply installations. Although high-density polyethylene pipe had not been in the standards for watermain materials, an assessment of 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 which range from 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 tons 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 whole sewage system, the very best 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 with a vertical curve with 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, capacity to bend as well as withstand the stress of horizontal directional drilling. Excavation and environmental impact were kept to a minimum, and the project was completed in a month, one-third time needed for the typical trench-digging operation, at a total cost of $2.4 million.
Since its founding in 1950, PPI continues to be the voice due to its members who take part in manufacturing and distributing polyethylene pipe systems. Members share an interest in 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.