Sanitary solutions

Continuing our feature on drainage systems for high-rise buildings, Guy Wilson outlines a single stack solution that has now been approved for use in the UAE.

The Sovent fitting in installation on the Palm Jumeirah
The Sovent fitting in installation on the Palm Jumeirah

Continuing our feature on drainage systems for high-rise buildings, Guy Wilson outlines a single stack solution that has now been approved for use in the UAE.

The Sovent single stack drainage system has now been successfully introduced to the UAE market. The system can provide a solution for high-rise large-scale projects where cost and convenience are major considerations.

It has been tested in thousands of installations worldwide over the past 40 years, but like any product, testing and approval is required prior to introduction to the local market.

The system, having been successfully evaluated by the British Board of Agrément, has now also been certified and approved by Dubai Municipality.

Sovent system operation

The Sovent system is a patented single-stack drainage system that substantially improves the performance of a soil and waste drainage systems.

It provides an effective solution to traditional branch and waste connections in vertical stack installations, increasing the capacity, enabling the elimination of separate vent stacks and reducing the diameter of stacks in high-rise buildings, thereby saving all important space in the service shafts.

The system is particularly effective in buildings that are more than five storeys high. In such installations it can create considerable cost savings as well as enhanced drainage performance.

The Sovent fitting is manufactured from high-density polyethylene (HDPE) and can therefore be directly integrated within HDPE drainage systems.

The design concept of the system is that it eliminates the need for separate vent stacks by reducing the maximum flow velocity in the discharge stack compared to that in a standard installation, slowing the flow as it passes through each Sovent fitting.

The benefit of this is that it air pressure fluctuations in the stack are reduced, therefore the need for a secondary vent stack, which is normally needed to prevent the siphonage of traps connected to appliances, is eliminated.

The hydraulic and pneumatic balancing of a stack system is highly complex. Each individual stack has its own characteristics and its capacity depends on the flow rate of the appliances, their simultaneous discharge pattern and the branch inlet configurations.

The positive and negative pressures within a system have to be limited in order to maintain the water seals in the traps and therefore retain a healthy environment with no unpleasant smells. The Sovent system is specifically designed to handle this very important balancing act.

The stack sizes can be significantly reduced compared to systems with a secondary ventilated system. A single 110mm Sovent drainage stack, for example, is capable of draining up to 70 bathrooms.

In addition to cost savings and improved operational performance, a Sovent system saves space and offers versatility of branch joining positions for easier onsite pre-fabrication.

The Sovent fitting is designed with six capped off connection positions enabling a choice of connection options to ensure the optimum installation configuration for each individual application. The fitting replaces a conventional branch connection, contributing to overall material savings.

The system is maintenance free and offers improved acoustic performance, which can be further enhanced by the installation of sound attenuating installation accessories.

Project installations

Sovent has been proved over many years in various countries and is included in several standards including DIN EN 12056-2. The system has been successfully installed and used in many prestigious projects including the Zurich Twin Towers Commercial Centre, Montreal's Hyatt Regency Hotel and the Arabella Sheraton Hotel in Cape Town, South Africa.

More recently the system has been effectively installed in a number of projects in Dubai, including the Golden Mile and Fairmont Residences on the Palm Jumeirah.

Sustainable operations

One of the objectives of the US Green Building Council Leadership in Energy and Environmental Design (LEED) rating system is the overall reduction in the use of materials and the increased use of materials with a recycled content.

Use of the Sovent system has been proven to contribute to a substantial reduction in materials used. In addition, the use of HDPE drainage systems is recommended by Greenpeace as an environmentally friendly alternative to other pipe systems.

As a leading manufacturer of HDPE drainage systems, Geberit collects, mills and reuses 100% of any plastics waste parts in the production process for new products such as the Sovent fittings.


Sovent system functions

• Eliminates hydraulic plug.

• Limits the velocity of the air and waste flow.

• Ensures venting action of the stack and branches in a drainage system.

• Combines the branch and stack so that branches flow in an optimal way.

• Only one Sovent fitting is needed per floor.

• It provides multiple connection possibilities with a single fitting.

• No parallel or back vents are needed.

• Up to 73 toilets per stack can be served using the system without the need for a separate vent stack.

• Smaller pipe diameters are needed in comparison to a standard system.

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