FAQ

Can the retention – drainage RAINBOX II be used in the transport engineering?

Yes, thanks to being compliant with the highest requirements concerning the durability,  which is confirmed by the IBDiM approval (to be downloaded in the “Documentation” section).

Due to what construction solutions is the retention – drainage box the strongest one available in the market?

It indeed is so and basically two elements are responsible for it:

• a novel stable column construction

• additional interior grid.
  

Is the retention – drainage boxes RAINBOX II system an inspection system?

Yes, thanks to the specifically designed channel enabling recording, rinsing and inspection of the system. One has to add that the inspection channel is made of the turquoise color material in order to make the effectiveness of using the CCTV camera better.

What are the minimum thicknesses of the ground coverage for the RAINBOX II system?

Depending on the terrain destiny:

a) 0,25 m in the green areas and with the load with passenger cars
b) 0,50 m with the truck cars SLW 60 class.

What are the minimum thicknesses of the ground coverage for the TUNEL 300/600 system?

Depending on the terrain destiny:

a) 0,25 m in the green areas and with the load with passenger cars
b) 0,50 m with the truck cars SLW 60 class.

What data is necessary for choosing the tank?

In order to choose the tank meeting the needs, there are four basic pieces of information needed:
• catchment area,
• soil type
• groundwater level
• area for development

What diameters are used to connecting with the retention – drainage systems RAINBOX II and TUNEL300/600?

The connections can be performed with the following diameters: Ø 160,  Ø 200, Ø 250, Ø 315. As seen, the elasticity is indeed sufficient in the Polish building – installation practice.

What is the easiest way of choosing the retention – drainage system?

 We encourage you to fill in the form [PDF, 152.93 Kb] [PDF, 152.93 Kb] of the system choosing, which can be found in our websites. In case of any questions we invite you to contact us by telephone.

What is the purpose of the retention – drainage RAINBOX II and TUNEL300/600 systems?

These systems are designed to development, temporary storage, retention and distribution and drainage of the rainwater, collected from the terrain surface (among others roads, pavements, park places, streets, squares, viaducts, green areas) and from the building roofs.

Are the roof inlets accessible as the heated version?

Yes, there is a possibility to use the self – regulating heating cable, which is a part of the DYKA offer.

Can VACURAIN be used as an emergency system?

Yes there is a possibility to use the VACURAIN as an emergency system. However such an installation should be correctly designed.

Do VACURAIN roof inlets comply with the EN-1253-1 norm concerning drip inlets in buildings? How about the technical approval and the ISO?

Yes, the VACURAIN system inlets are compliant with the mentioned norm, they have the Technical Approval of the Building Technology Institute AT -15-7775/2008, and design and selling of the VACURAIN system has ISO 9001 norm compliance certificate.

How does the underpressure roof drainage system work?

The rule of the system operation is based on creating underpressure by the water collected in the installation, which causes sucking water from the roof surface. During scanty rainfalls the underpressure installation works as the classic system.

Is it possible to use the VACURAIN system as a substitute for other underpressure system?

Yes, the VACURAIN system can be successfully used in the premises, which other underpressure system had been designed for. Such replacements are often performed due to the high quality of the VACURAIN system and its affordability.

Is the VACURAIN system assembly complicated?

No, the system is the underpressure drainage system with the easiest assembly available in the market. No special appliances are needed. It requires minimum time. The DYKA Company provides three free installers trainings and technical support during each investment realization stage. Additionally, the installation measurements and its valuation, done by the DYKA specialist and based on the delivered materials is free of charge.

Is the system operation based on pumps?

No. The underpressure in the system is created by the water column gathered in it and no electrical appliances are needed for its correct operation.

What are the advantages of the underpressure drainage system in comparison to the classical drainage of roofs?

The underpressure system is almost totally placed under the roof, and the underground installations are limited actually only to the house drain. Limitation of the ground works, including usage of the heavy duty machines, significantly lowers the cost of the installation. Further lowering of the costs results from the reduction of the used diameters of the pipelines along with the number and size of the inlets.
Significant speeds of the flow provide the self – cleaning of the system and the maintenance works are actually limited only to controlling the roof and cleaning the inlets. Therewith, the system exploitation costs are lowered too.

What are the advantages of the used material?

Thanks to using PVC-U it is possible to introduce the glued connections, which significantly reduces the time and cost of the installation in comparison to the systems made of PEHD, at the same time keeping its quality and durability.
Using PVC-U due to the significant stiffness of the pipes enables also introducing a mounting system which is quick and easy to assemble, not requiring stiff splints. Additionally it reduces the time needed to create an installation and reduces the roof load.
The many years experience of the installers performing the drainage shows that using the VACURAIN system reduces the edition of installation works by almost as much as 50%.

What data is necessary for completing an installation project?

The materials which are necessary vary according to the installation complexity level. Normally, however, it is a projection of the drained roof, showing the roof construction and external sewerage scheme (knowledge of the connection points).

What material is the VACURAIN system made of?

The system is made of the high class modified PVC – U mixes (with the enhanced resistance to impacts) of the dark green colour (RAL 6007).

Are plastics pipes suitable for laying sewerage pipelines at all? Does it not deform under the influence of steady loads from the embankment and the vehicular traffic?

The argument concerning the ovalisation of the plastics pipes in terms of the mechanical loads is undoubtedly overused. Based on it, plastics pipes and their usage in the sewerage system are being discriminated against. The pipe laid in the ground is a subject to powers, which horizontal components cause the ground stand from the side of the pipe and restrict the deformations. As a result of the powers submission the state of balance is created, in which the pipe can last for years. Within the balance state the so called relaxation emerges, which consists in disappearance of the tensions in the pipes, which contributes to the durability of the pipes in the ground. The real danger to the plastics pipes are the powers exceeding the allowed powers multiple times – the safety coefficient is bigger by 4.
It is worth remembering that the plastics pipes elasticity is their advantage, which results into their durability. Current research confirms the minimum 100 years durability of the plastics pipes in the gravity sewerage systems.

Can the thermoplastic pipes be laid with the same coverage as stoneware or concrete ones?

Yes, they can be laid with the same minimum coverage as the traditional materials pipes. It is the quality of installation works and the good assembly practice that mostly influence the level of the pipe bending, however the depth of the coverage does not significantly influence this parameter, similarly to the vehicular traffic. Based on the specialist research of TEPPFA it has been proven that the measurement methods originate from the size of the loads and generally return the overestimated levels of the pipes bends.

Despite the integrity on the connections we have troubles running the integrity test on the PE pipeline. What can be the cause?

The procedure presented in the PN-B-10725:1997 concerning the testing of the pipe sections integrity with using the hydraulic test is not suitable for the pipelines made from thermoplastic materials due to the viscoelastic properties shown by these materials. The pipeline made of polyethylene (PE) pipes and exposed to the inner pressure (both trial and the knockabout) undergoes creeping (enlarging of the diameter and length). The creeping occurrence due to the fact of the long term properties of such pipelines is omitted but is of utter importance during the pipeline integrity test (especially the newly built one). In order to unequivocally confirm the polyethylene pipelines integrity, we offer using the integrity testing procedure enclosed in the European norm EN 805:1996 project (precisely in the A.27 attachment to this norm).

Does the abrasive wear constitute a problem in case of the thermoplastic pipes?

In terms of the thermoplastic sewerage pipes the abrasive wear is so insignificant that it does not affect their usability properties at all. The abrasive wear measurements have been performed during the 100 years exploitation of the plastics pipes, which showed that this wear does not exceed 0,5 mm. Thermoplastic pipes have the great resistance to the abrasive wear, overriding the stiff materials pipes (stoneware, concrete, reinforced concrete, galvanized steel).
 At the moment the maximum speed of the sewerage flow have been defined in the manual on the same level as in case of the traditional pipes, which is 5 m/s for the sanitary sewerage and 7 m/s for rain water and combined sewer system.

How can a shallow placed sewerage PVC - U pipe be warmed?

If the pipe is placed above the frost line of the land should be considered if the dynamic loads of the level occurred - such as the ones resulted from vehicular traffic. In the absence of such charges the pipe can be insulated, e.g. slates of polystyrene. If such loads occur, heat-insulating material can be used, which can thicken to the desired level according to the modified Proctor scale. Such material, for example, can be expanded clay or slag. The appropriate degree of compaction of material around the pipe causes its resistance to external loads. If the insulation material has a sharp edge, its direct contact with the pipe cannot be allowed – a sand pouring or wrapping the pipe with a plastic film of appropriate thickness can be performed.

How deep can the thermoplastic sewerage pipes be laid? What is the minimum recommended depth of the ground coverage?

With using the traditional installation techniques these pipes can be laid at the 6 m depth. It has been proven by the TEPPFA that the bend of the elastic plastics pipes is dependent only from the subsidence of the ground means surrounding the pipe and is absolutely independent from the size of the vertical ground pressure. As for the minimum recommended depth of the ground coverage – different countries present different requirements, however the coverage of minimum 0,8 m returned positive results in the carried out detailed research on the influence of the thermoplastic pipes with the vehicular traffic.

How do the exploitation properties of the thermoplastic pipes perform in comparison to the sewerage pipes made of different materials?

The number of damages of the sewerage pipelines made from the thermoplastic materials constitutes 1/5 of the number of the damages recorded in case of sewerage pipes made of traditional materials (stiff). These results originate from a wide research project concerning the exploitation properties of the existing systems in Germany, Netherlands and Sweden, where all (1 800 km) the researched pipes had been being exploited for at least 12 years. This research also showed that the influence of the average section of the plastics sewerage on the environment constitutes 15% of the influence which is the property of the section made of traditional materials.

Making the price comparison of the individual works, the traditional products manufacturers (stoneware, concrete pipes) with the PVC – u products, they convince the investors that the plastics is the least profitable choice in economical terms for their investment. Should this be taken seriously?

Their thesis is illustrated by the summary of the prices originating from the commonly accessible source – the elaboration made by the reputable company, suggesting that making the gravity sewerage system using traditional pipes is cheaper than the plastics pipes. In comparison to it the diversity of the PVC-u pipes is not taken into account (e.g. the stiffness, kind of walls, heart) are not mentioned, the market prices of the plastics products are not included into the calculation but only the catalogue prices, by which the investor never buys products anyway. Besides, there are made differences in the ways of  protecting the excavation walls – for the plastics pipes taking full expensive protection with moldings, and for stoneware pipes calculating cheap system or openwork excavation walls protection in case of concrete pipes.
The account of the plastics systems is additionally burdened with unnecessary for laying plastics pipes activities, such as ore exports for temporary storage within the 1 km distance and backfilling with it after its return delivery. Very often the necessary for stoneware or concrete systems pew foundations are not taken into account, also the costs of the heavy duty machines needed for laying traditional pipes are not mentioned.