- Does a Siphonic System require any special piping system, and if so, will it be more expensive?
There is no restriction in the type of pipe material that can be used in Siphonic Systems. The following types have all been used; UPVC, HDPE, Cast Iron, Stainless Steel. A combination of different pipe materials in the same system is also quite common. Well engineered siphonic systems use much smaller pipe diameters than Conventional RWDP systems and therefore produce more economical solutions.
- Can the Siphonic System be installed by any contractor?
The Siphonic System must be installed in accordance to the Specialist's requirement so as not to affect the performance of the System. It is recommended that this is therefore done by trained installers.
- Is the Siphonic System only cost efficient for high-rise building?
No. Whilst the cost efficiency in high-rise building is more apparent due to the savings in the greater quantity of pipes, the cost efficiency in low-rise and smaller roof areas will come from indirect saving made in associated works such as external drainage, etc.
- What is the minimum height requirement for a building to use Siphonic System?
There is no minimum height requirement for Siphonic System. Proper engineering calculation will ensure that the System can function at the height designed for.
- What are the gradient requirements for the horizontal pipes in the System? Is there a limitation to the length of horizontal pipe run in the System?
All horizontal pipe works in the System do not require a gradient. Siphonic systems can run far longer and at zero gradients than any conventional system.
- What happens when the rainfall intensity is higher than that designed for?
Rainfall intensities are based on statistical information and the design criteria must be carefully chosen. As with conventional systems the amount of rain drained will be what is designed for. It is best to seek specialist advice if there is any concern.
- Is it better to design buildings with a high design rainfall intensity to avoid the potential from the normal design rainfall intensity being exceeded?
Over designing rainwater systems is not economic. Any excess rainfall above the design rainfall intensity will not affect the siphonic system but will affect the building. The building designer must consider the balance between risk and cost.
- What is involved in the engineering of a siphonic system?
Properly designed siphonic systems should be carried out by professionals who will provide engineering calculation and shop-drawings. In some countries a local Professional Engineer may need to endorse the design. The system should carry a form of technical compliance such the British Board of Agrement.
- Does the System require certification from an independent Testing Agency or Local Authority?
In most countries the Local Authorities leave the responsibility with the building designers. Siphonic drainage Codes of Practice are being developed but until these are implemented fully it is better to rely on systems which are independently tested by such bodies as the British Board of Agrement.
- What kind of Warranties are provided for Siphonic system?
Warranties can be provided for the Siphonic system. This can be for just the design element or it can be extended to include the installation. Warranties vary a lot in description and depending on the format the cost of such Warranty will be determined.
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