DN/OD 90
In the DN/OD 90 category you will find drainage pipes and fittings with an outer diameter of 90 mm. This standard size is used for house installations and property drainage and offers high chemical and thermal resistance.
Buy DN/OD 90 — Guide&Tips
TheDN/OD 90 house drainage pipe system includes pipes, fittings, and seals with an outer diameter of 90 mm. This standard size is used in building and property drainage when medium to large wastewater volumes need to be discharged – typical for apartment buildings, commercial units, or connections with multiple usage units. The 67 items in this category are mainly made of HT material (polypropylene), which is chemically and thermally resistant and suitable for both indoor and outdoor use.
What should you consider when selecting? The key factor is hydraulic performance: DN/OD 90 handles higher flow rates than smaller nominal diameters, but requires correct dimensioning of the downpipes and collecting pipes. Check the required pipe length as well as the number and type of fittings (bends, branches, sockets) before purchasing. A common mistake is combining components from different manufacturers – always use coordinated systems. Also pay attention to sound and thermal insulation for indoor pipes; special insulation mats or flame-retardant pipe jackets reduce flow noise and prevent condensation.
For outdoor use, frost-resistant seals and, if necessary, an additional drainage layer in the ground are recommended. If you need to drain oily wastewater from a workshop or commercial kitchen, use oil-resistant NBR seals – these are also available in this category. Compare compatibility with your existing system: Most manufacturers offer transition pieces to other nominal diameters such as DN/OD 110 or DN/OD 50, so a system change is possible without complex adapters. Use the filter function to sort specifically by applications such as building drainage, property drainage, or renovation.
Typical purchasing mistakes: Many DIY enthusiasts underestimate the importance of correct Sound decoupling for internal pipes. The choice between smooth and socketless variants also affects installation speed – socketless systems save time but require precise cutting. Always plan a little reserve for unforeseen deviations. A look at the technical data sheets of the individual articles provides information about pressure ratings, temperature ranges, and approvals. This ensures your drainage system remains permanently leak-proof and low-maintenance.
Popular DN/OD 90
The three products shown cover typical application areas: The oil-resistant seal is a special item for wastewater with fat or oil content – a must in every workshop. The HT pipe with long socket is suitable for fast, clean installation on straight runs, while the branch 90/50 enables the connection of smaller pipes to the main nominal diameter. When combining, ensure that all components use the same socket system (e.g., push-fit socket with lip seal) to avoid leaks. For renovations or extensions of existing systems, transition sockets from DN/OD 90 to other diameters are also available – you can find these in the category as well.
Frequently asked questions
What pipe length do I need for a single-family house?
The total length required depends on the number of drainage points and the size of the building. Calculate about 5–10 m of downpipe per floor and 2–3 m of collecting pipe in the ground. For DN/OD 90, plan for typically 15–25 m of pipe material for a single-family house. Additionally, include about 20 % reserve for bends, branches, and unforeseen deviations. Use the configurator or ask a specialist dealer to determine the exact length.
Can I connect DN/OD 90 with other pipe systems?
Yes, this is possible with suitable transition pieces. There are special adapters for connecting to KG pipes (push-fit socket) or cast iron pipe systems. Ensure that the seals are designed for the respective pressure and temperature range. When combining different nominal diameters – for example from DN/OD 90 to DN/OD 110 – use conical reducers or sockets with integrated seal. Check the compatibility information in the technical data before purchasing.
Which seal is suitable for oily wastewater?
For oily wastewater from workshops, garages, or commercial kitchens, we recommend NBR seals (nitrile rubber). These are resistant to mineral oils, fats, and many chemicals. Standard EPDM seals swell on contact with oil and lose their sealing effect. In the category you will find a suitable oil-resistant seal DN 90 (NBR) – look for the marking 'oil-resistant'. Replace these seals periodically, as NBR also ages over time.
How do I avoid leaks during installation?
The most common cause of leaks is improperly inserted sockets or damaged seals. Lightly grease the seal with assembly paste before connecting, ensure it sits straight, and push the pipe fully into the socket. Avoid sharp-edged tools that could damage the sealing lip. For outdoor installations, additionally maintain a gradient of at least 1–2% so that water drains quickly and no pressure can build up.
Other categories
DN/OD 90 is a versatile nominal diameter, but not the first choice for every application. If you are planning a smaller single-family home or a small number of drainage points, oftenDN/OD 50is sufficient – it is more cost-effective and easier to install. For larger buildings or commercial constructions with multiple floors,DN/OD 110is recommended, which handles higher flow rates. Also, theparent category house drainage pipe systemoffers an overview of all nominal diameters from 32 mm to 160 mm and helps you choose the optimal system for your project.
- → House drainage pipe system – overview of all nominal diameters
- → DN/OD 110 – for large wastewater volumes
- → DN/OD 50 – for smaller buildings and individual connections
Before changing the system, check the hydraulic load of your planned pipeline: undersizing leads to blockages, oversizing to unnecessary costs. In case of doubt, consult a wastewater expert or refer to DIN 1986-100, which specifies minimum nominal diameters for various connections. Also, connections to public sewer systems may require certain minimum diameters – check with your municipality.
In summary
DN/OD 90 is a common standard size for house drainage pipe systems that safely drains medium to large wastewater volumes. The category includes pipes, fittings, and oil-resistant seals. Pay attention to system compatibility, sufficient pipe lengths, and proper insulation. For smaller or larger projects, the nominal diameters DN/OD 50 and DN/OD 110 are suitable. Plan your material list carefully – this saves time and prevents later damage to masonry or soil.