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Myths and Truths about HDPE corrugated pipe

In this article, you ask questions about the main myths and truths about the use of Tigre-ADS HDPE corrugated tubes.

Present in South America since 2003, Tigre-ADS is the leader in the High Density Polyethylene corrugated pipe segment. Suitable for drainage, sanitation, rainwater retention and retention works, HDPE corrugated tubes allow significant savings in works and are an excellent substitute for other materials, such as concrete, PVC and ceramic materials.

Widely used in Europe and the United States, HDPE corrugated tubes are standardized by national and international standards, such as NBR ISO, ASTM and ASHTO.

In this article, you ask questions about the main myths and truths about the use of Tigre-ADS HDPE corrugated tubes.

01 – USING CORRUGATED HDPE TUBES MAKES THE WORK MORE EXPENSIVE?

Myth. In addition to the technical advantages of the product and the service life three times longer than that of concrete, the use of corrugated HDPE tubes allows significant savings in all stages of the work, from delivery to installation.

As the transport of the parts is usually done in bulk or dry cargo carts, the unloading of the tubes is easy and fast, while the concrete one usually requires more time and heavy equipment.

When comparing the weights between HDPE pipes and concrete pipes of the same diameter, the differences are striking. While a 600 mm HDPE tube weighs 16 kg / m, the concrete tube weighs an average of 300 kg / m.

If we make a comparison between 1200 mm tubes, the numbers will be even more significant. While HDPE tubes weigh 46 kg / m, the concrete shackle weighs around 900 kg / m. This means that concrete pipes weigh 1,950% more than an HDPE pipe.

It is evident that, due to the difference in weight, the costs for handling, transporting and installing concrete pipes are much higher than the costs for HDPE pipes. For this reason, the installation of HDPE tubes can reduce up to 70% the time of execution of the work, in addition to requiring less labor and machinery.

02 – DOES THE INSTALLATION OF THE HDPE TUBE REQUIRE SPECIALIZED LABOR?

Myth. There is no specific technical course for installing this solution. The manufacturers themselves, such as Tigre-ADS, offer technical support to guide construction professionals to correctly install the solutions according to technical recommendations, providing consultancy related to the products, their applications and specifications. The training content is specially designed for each audience, according to the client’s needs.

03 – IF INSTALLED INCORRECTLY, CAN THE TUBE BE DEFORMED?

Truth. If it is installed improperly, without proper lateral compaction and respect to the minimum covering, the product may suffer deformations due to the actions of the loads involved. For this reason, Tigre-ADS offers support and guidance to the customer and the workforce for its correct installation.

04 – CAN THE HDPE TUBE BE STORED IN AN OPEN LOCATION, EXPOSED TO THE SUN RAYS?

Truth. Studies show that HDPE maintains resistance to stress even after 36 months of exposure to UV rays, ensuring that, during installation, there is no need for storage in a covered place.

05 – CAN HIGH DENSITY POLYETHYLENE (HDPE), USED IN THE MANUFACTURE OF TUBES, MAY POLLUTE THE ENVIRONMENT?

Myth. HDPE is a chemically inert material and does not contaminate the soil or groundwater. Because it resists the chemical action of hydrogen sulphide and effluents with a pH between 1.5 to 14 and still has a tip / bag union, it also guarantees the system’s tightness, preventing leakage of effluents and preventing contamination to the environment.

06 – DOES THE HDPE TUBE HAVE MORE HYDRAULIC EFFICIENCY THAN OTHER TECHNOLOGIES?

Truth. As the conduction capacity of a pipe is inversely proportional to its internal roughness, the low level of roughness inside the HDPE tubes helps in its hydraulic efficiency to conduct water and water-based fluids. This ability represents the friction, in opposition, of the surface of the tube to the flow of the liquid. In a comparison, the HDPE manningranges from 0.009 to 0.012. Concrete varies from 0.013 to 0.017.

Less roughness can reduce installation costs, compared to other technologies, due to the reduction of DNs or slopes, resulting in less need for excavations, backfills, dump etc. That is, it reduces the costs of earthmoving.

07 – IS IT TRUE THAT HDPE TUBES CAN BE INSTALLED WITH LESS COVERING THAN CONVENTIONAL TUBES?

Truth. For loads type H-25 and with lateral compaction of at least 90% normal proctor, HDPE tubes can be installed with a minimum covering of 30 cm for pipes with diameters up to 1200 mm and 60 cm for pipes with a diameter of 1500 mm.

08 – IN THE PIPE UNIT WITH VISIT WELLS (PV), CAN THERE BE LOSS WHEN PERFORMING CUTTINGS IN THE TUBE?

Myth. Tigre-ADS tubes have a point-pouch connection system and are six meters long. If the total length is not used, and it is necessary to make a cut, the part that was not used can easily be used at another point.

09 – IS IT POSSIBLE TO UNION TUBES FROM DIFFERENT SUPPLIERS?

Truth. Currently, there are connections that allow the interchangeability of different suppliers, in addition to the possibility of using conventional PVs (manholes). Consult the Tigre-ADS commercial team for more information.

10 – DOES THE INTERNAL DIAMETER OF THE HDPE PIPING INFLUENCE IN THE PREPARATION OF THE HYDRAULIC CALCULATION OF THE PLUVIAL DRAINAGE PROJECT?

Truth. It is essential that the drainage or sewage project defines the minimum internal diameter of each pipe in order to meet the criteria defined in the hydraulic calculations. The diameters must comply with the requirements of the reference standard, both for the DN / DI series and for the DN / DE series.

11 – IS IT TRUE THAT THE ABNT NBR ISO 21138-3 STANDARD ONLY ALLOWS THE DN / DE SERIES (EXTERNAL NOMINAL DIAMETER)?

Myth. The standard allows both the DN / DI (Nominal Diameter based on the Inside Diameter) series and the DN / DE (Nominal Diameter based on the Outside Diameter) series, with the designer or buyer being responsible for defining the diameter that meets the design criteria.

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