Engineering Information

HDPE pipes are not more difficult to engineer than metallic pipes once their basic material behavior is understood. HDPE’s light weight, toughness, and flexibility offer capabilities not possible with PVC, ductile and cast iron pipes.

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News and Events

AWWA C901 and PPI TN-49 Expand the Use of HDPE in Potable Water Service

On June 11, 2017, the American Water Works Association approved the newly revised standard AWWA C901-17 for HDPE water service. At the same time, PPI published a technical note (PPI TN-49) to support the new standard.

These publications expand the use of HDPE into a broader range of potable water applications and provide the user with the ability to specify PE4710 for water service systems using chlorine and chloramine residual disinfectants that meets or exceeds 100-year projected life in potable water service applications.

And the ability to compare the performance of PE4710 under the actual operating conditions of selected utilities in California, Colorado, Florida, Indiana, Michigan, Nevada, North Carolina and Texas.

FM Approved pipe users: FM 1613 February 2017 revision Pressure Class changes

Effective February 2017, FM Approvals has updated the Pressure Classes in standard FM 1613 to match those found in AWWA C906-15. read more

INEOS O&P USA has acquired WL Plastics

INEOS O&P USA announced November 1, 2016, that it has acquired 100% of the shares of WLP Holding Corp., one of the largest high density polyethylene (HDPE) pipe manufacturers in North America. The business is headquartered in Fort Worth, TX with production facilities in Georgia, Kentucky, South Dakota, Utah, Texas, and Wyoming. read more



In response to the new Pipeline Hazardous Materials Safety Administration (PHMSA) ruling, WL Plastics will no longer be using rework material in our ASTM D2513 gas distribution, or jurisdictional gas gathering pipe. On future requests for quotations (RFQs) and purchase orders (POs) it will be important for you, the customer, to inform us if the pipe will be used in a gas distribution, or jurisdictional gas gathering application. read more

A Victory for Potable Water

When the final decision was made to build a new potable water pipeline in St. George, Utah, just southeast of Salt Lake City, the engineering firm of Jones & DeMille Engineering, Inc. knew that it was faced with some unusual circumstances. The terrain ranged from foothills to desert to rivers and canals; plus, the pipe would also be installed under roads. Physically, the pipe would have to handle pressures up to 260 psi, be able to stand up to the corrosive soil, require minimal maintenance and be leak-free. It also had to provide the owner with a reliable and durable water distribution and transmission system. read more


What if there was a pipe material that doesn't leak, won't rust or corrode and, when properly installed will be leak-free and maintenance-free for 100 years? Sound too good to be true? It's not. To find out how High Density Polyethylene Pipe (HDPE) we can solve our pipe infrastructure emergency, CLICK HERE video link

WL Plastics: ISO 9001:2008 Certified

WL Plastics is ISO 9001:2008 certified for its quality system. ISO 9001:2008. Quality System Certification is registered for WL Plastics Corporation, Ft. Worth, TX, and its manufacturing plants at Mills (Casper), WY; Cedar City, UT; Elizabethtown, KY; Bowie, TX; Snyder, TX; Rapid City, SD and Crossfield (Calgary), AB. read more

PE 4710 Chosen for durability and savings

PE 4710 was the Ideal Solution for Washington County Water Conservancy District’s Water Distribution System They began this project to deliver water to irrigators four and a half miles away at Anderson Junction. The project consisted of the district piping an old ditch called the Peter Anderson Ditch. Water loss along the ditch was large and often only a trickle was left at the end of the ditch. The ditch diverted water from Wet Sandy Creek to Anderson Junction. read more