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D-Rex

Double Walled Corrugated Underground Drainage System

Double Wall Corrugated (DWC) pipes were introduced as DRex  in India for the first time. These pipes are made of a material called PE/PP. They have a smooth inside and a corrugated (wavy) outside surface. The corrugated outside surface makes the pipes strong and able to handle heavy loads without getting damaged.

Unlike regular pipes, D-Rex pipes don’t get squashed when vehicles drive over them. They are also flexible enough to be installed in curved paths. The inside wall of the pipes is smooth, which helps liquids and slurry flow smoothly without getting blocked or collecting dirt inside the pipe. Because of these advantages and the reasonable cost, D-Rex pipes are popular among customers and contractors.

Certifications

Features & Benefits

  • Eco-Friendly
  • Long Life & Cost Effective
  • Light weight and easy to handle
  • Flexible and Fatigue Resistant
  • Excellent Load Bearing Capacity & Stiffness
  • High Hazen William’s Coefficient ‘C’ – 150
  • Excellent Chemical, Corrosion & Abrasion Resistance
  • Suitable for aggressive climatic conditions
  • Corrugated Profile gives excellent soil bonding
  • Telescopic transportation possible
  • Easy & Quick Installation with no need of heavy machinery
  • Watertight Joints and Maintenance Free
  • Rodent repellence (on-demand) – to avoid rodent attacks
  • Perfect Hydraulic Properties with Low Manning’s Roughness Coefficient ‘n’ – 0.009

Fields of Application

  • Culvert and Highway Drainage
  • Effluent/Wastewater Transport Network
  • Rainwater Collection Network
  • Storm water Drainage Network
  • Sewerage and Drainage, Collectors for Sub-Surface Drainage

Standards & Specifications

  • IS 16098 (Part-2)
  • ISO: 21138 (Part-3)
  • BS EN 13476 (Part-3)

Available Sizes

  • Pipe DN ID 75mm to 800mm
  • Type – Regular & Rodent Repellent
  • Plain End & In-line Socketed End
  • Pipe Stifness Classes: SN 4 (4 kN/m2 ) & SN 8 (8 kN/m2)

FAQs

The load-bearing capacity of D-Rex pipes is measured using SN (Standardized Nominal) classes. In this classification, SN1 is equivalent to a load of 100 kg/m2. Our D-Rex pipes are available in SN4 and SN8, which correspond to load-bearing capacities of 400 kg/m2 and 800 kg/m2, respectively. These SN classes indicate the strength and capacity of our pipes to withstand different levels of loads.

According to the governing standard, D-Rex pipes can be installed at a maximum depth of 6 meters. However, it is important to note that the actual depth requirements may vary depending on factors such as slopes, soil type, and other project-specific considerations. It is recommended to evaluate these factors and consult the appropriate guidelines and experts to determine the optimal depth for the installation of D-Rex pipes in a specific project.

According to the governing standard, the minimum depth requirement for the installation of D-Rex pipes should be more than 0.8 meters. This minimum depth ensures proper functionality and adherence to the specified standards. It is important to follow these guidelines to maintain the integrity and effectiveness of the D-Rex pipe system.

SN4 and SN8 are classifications for drainage pipes based on their stiffness and structural integrity. They have various applications, including:
-> Municipal Sewer Systems: Used to carry wastewater and sewage in residential, commercial, and industrial areas.
-> Stormwater Drainage: Collect and transport rainwater or runoff from roads, parking lots, and flood-prone areas.
-> Agricultural Drainage: Control water levels and drain excess water from fields to improve soil conditions.
-> Land Drainage: Draining water from sports fields, golf courses, and landscaped areas.
-> Road and Highway Drainage: Manage water flow to prevent damage to pavement and ensure safe driving conditions.
-> Industrial Drainage: Dispose of industrial wastewater or serve as conduits for fluids and chemicals.
-> Residential Drainage: Used for foundation drainage, basement waterproofing, and rainwater harvesting.

Consulting with experts is crucial for accurate pipe selection, considering factors like flow rate, soil conditions, installation depth, and local regulations.

The rubber ring used in our products is made of EPDM (Ethylene Propylene Diene Monomer) rubber. EPDM rubber is a durable and reliable material known for its excellent resistance to weathering, UV exposure, ozone, and a wide range of chemicals. It is commonly used in various applications due to its high elasticity, thermal stability, and resistance to degradation. The EPDM rubber rings used in our products ensure a secure and watertight connection, providing long-lasting performance and reliability in the intended applications.

DWC (Double Wall Corrugated) D-Rex pipes are specifically designed for non-pressure underground drainage applications. It is important to note that these pipes are not intended to be exposed to open or above-ground environments. Therefore, it is not advisable to use DWC D-Rex pipes in a suspended position in basement parking areas.

The design and construction of DWC D-Rex pipes are optimized for underground installations, where they excel in providing efficient and reliable drainage solutions. To ensure the pipes' proper functioning and longevity, they should be utilized as per their intended application within the specified guidelines and recommendations.

In the event that a DWC D-Rex pipe becomes damaged or punctured, it is recommended to identify the affected section and cut it out. The damaged portion should then be replaced with a new section of pipe. This replacement can be achieved by using connecting couplers on both ends to securely join the new pipe segment to the existing pipeline. By following this procedure, the integrity and functionality of the drainage system can be restored effectively.

Yes, it is true that rodding can potentially cause damage to any type of plastic pipes, including D-Rex corrugated pipes. Therefore, it is advisable to avoid rodding when it comes to maintaining and clearing blockages in D-Rex pipes. Instead, it is recommended to consider the use of a hydro jetting mechanism. Hydro jetting utilizes high-pressure water streams to remove obstructions and clean the pipes without causing damage. This method is more suitable for D-Rex pipes and helps to maintain their structural integrity and functionality over the long term.

In sewerage and drainage network projects, connections between different materials of construction (MOCs) are typically achieved by inserting a constructed or pre-fabricated manhole or chamber. This method ensures a secure and reliable connection. However, in cases where the construction or addition of a manhole or chamber presents challenges, the use of repairing couplers can be considered as an alternative solution.

Repairing couplers provide a means to connect different MOCs without the need for extensive construction work. They are designed to join pipes of varying materials, sizes, or shapes, allowing for flexibility in connecting different sections of the sewerage and drainage network. By utilizing repairing couplers, the project can overcome obstacles and maintain the integrity of the system while ensuring efficient and effective wastewater management.

D-Rex pipes are specifically designed to accommodate the temperatures and conditions typically encountered in sewage and domestic waste water systems. These pipes are engineered to withstand standard temperature ranges from 20°C to 40°C under normal conditions. However, as part of testing compliance with IS code requirements, the pipes undergo stability testing at temperatures up to 80°C.

It is important to note that D-Rex pipes are not intended or designed for the transportation of hot water or for use in applications involving higher temperatures. They are optimized for the specific demands of sewage and domestic wastewater management, providing reliable performance within the specified temperature range. For applications involving hot water transport or higher temperature requirements, alternative piping solutions specifically designed for such purposes should be considered.

According to standard references, the expected lifespan of PE/PP (polyethylene/polypropylene) pipes, including DWC (Double Wall Corrugated) pipes, ranges between 50 to 100 years. These estimates are based on the durability and longevity of the materials used in manufacturing these pipes, as well as their resistance to various environmental factors and chemicals commonly encountered in underground installations.

It's important to note that the actual lifespan of the pipes can be influenced by factors such as installation conditions, maintenance practices, and the specific operating environment. Regular inspections, adherence to recommended installation guidelines, and appropriate maintenance can help ensure the optimal performance and extended life expectancy of PE/PP pipes, including DWC pipes.

Indeed, the possibility of damage caused by pests can exist in certain environments. However, if such a possibility is anticipated, Astral Pipes Infra Division can provide D-Rex pipes with anti-rodent properties. These specialized pipes are designed with features that deter pests and limit their ability to cause damage. It is important to note that while the anti-rodent properties can reduce the likelihood and extent of damage, they do not completely eliminate the possibility. Implementing these pipes can be a proactive measure to mitigate the risks associated with pest-related damage in underground installations.

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Description

Double Walled Corrugated Underground Drainage System

Double Wall Corrugated (DWC) pipes were introduced as DRex  in India for the first time. These pipes are made of a material called PE/PP. They have a smooth inside and a corrugated (wavy) outside surface. The corrugated outside surface makes the pipes strong and able to handle heavy loads without getting damaged.

Unlike regular pipes, D-Rex pipes don’t get squashed when vehicles drive over them. They are also flexible enough to be installed in curved paths. The inside wall of the pipes is smooth, which helps liquids and slurry flow smoothly without getting blocked or collecting dirt inside the pipe. Because of these advantages and the reasonable cost, D-Rex pipes are popular among customers and contractors.

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