Pipes and fittings for internal sewers

Pipes and fittings for internal sewers

As the largest PVC-U processor in Romania, Teraplast produces a wide range of unplasticized PVC pipes for gravity buried sewage systems, subject to normal charges or to special work charges. 

The PVC-U system area of use is diversified covering both buried sewage networks for wastewater and rainwater applicable in infrastructure and residential buildings, water evacuation in agriculture and industry or for drainage. 

Maximum temperatures of wastewater carried through PVC-U systems are: 60 ° C - for pipes with D 110 - 200 mm and 40 ° C for pipes with D 250 - 500 mm. Temperatures of 60 ° C are also allowed for short periods of time. The recommended slope range is between 4 - 500/00. 

PVC-U pipes and fittings are produced by extrusion, respectively by injection of a mixture of PVC and carbonate, respectively unplasticized hard PVC granules in combination with dyes, fillers, stabilizers and friction additions.

Tightness is provided with gaskets made of long-lasting synthetic rubber, which are mounted in the profiled element of the pipe socket. Tightness remains assured even if the pipe is deformed within its permissible limits or movements.

The pipes are delivered with the seal gasket installed. The estimated lifetime of the PVC-U system is of minimum 50 years. The exterior sewage system in PVC-U offered by Teraplas is a complete and diversified system that includes both multilayer pipes in accordance with SR EN 1401, SR EN13476-1, 2 and SF36/2017 standards and compact pipes in accordance with SR-EN 1401-1.    

From a dimensional point of view, the range of Teraplast PVC-U pipes ranges between 110 and 500mm. Depending on the ring stiffness, Teraplast produces PVC (multilayer or compact) pipes in SN2, SN4, SN8 and SN12 range. 

The main features and advantages of PVC-U pipes and fittings

Mechanical resistence

PVC pipes are part of the flexible pipes category. This feature gives PVC-U pipes (unplasticized PVC) a special mechanical strength, which can transfer to the soil around them a large part of the charge exercised on them. In case of overloading, the PVC-U pipes react with a reversible deformation that does not affect their functionality, in case of suitable installation.

Chemical Resistence

TBoth PVC-U pipes and fittings have a high chemical resistance to most aqueous solutions, the aggressive action of soil materials, salts and caustic substances or aqueous acidic solutions. Thus, PVC-U pipes and fittings can be used to transport basic or acidic aqueous solutions, mineral salts, etc., with a pH between 2 and 12 and working temperatures of max. 60 ° C. 

Hydraulic features

The outstanding hydraulic features of the PVC-U pipe system and fittings are determined by the ability to produce interior walls with an extremely reduced russeting. 

Handling

The low weight of the PVC-U pipe system components and fittings ensures an extremely high manoeuvrability in terms of transport, storage and handling, as well as installation. Also, the existence of gaskets ensures an easy and tight joint of the components, ensuring a high mounting speed. For a high mounting speed, it is recommended to lubricate the gasket and the end of the pipe that will be socketed. 

Presentation of the PVC-U multilayer pipe system

Teraplast is the first Romanian company that has produced this type of pipe (multilayer) since 2004, using a revolutionary co-extrusion technology at that time. The main feature of the multilayer PVC-U pipes is the wall structure that consists of 3 PVC-U independent layers, thus:  

  • A compact interior layer in compact PVC,
  • The core, made out of expanded PVC,
  • An exterior layer in compact PVC. 

This results in a PVC-U pipe with mechanical properties similar to those of pipes made with a compact wall, but with a lower specific weight and, implicitly, with a lower cost.  

Teraplast produces PVC-U multilayer pipes for exterior buried gravity sewage in accordance with SR EN13476-1, 2 and SF36/2017 standards. The range of diameters is between 110mm and 500mm with ring rigidity SN2 (SDR51), SN4 (SDR41), SN8 (SDR34) and SN12 (SDR30). 

The colour is orange RAL8023.

The products are used for gravity household and industrial wastewater sewage outside the building, buried, with depth between 0.8 m and 6 m.

SN2 - in areas without street traffic,

SN4 - street with average traffic load,

SN8, SN12 - medium or heavy load traffic.

The system is completed with a wide range of PVC-U fittings injected in the same dimension range as the PVC-U pipes. Teraplast offers PVC-U fittings both in the SN4 stiffness class and in the SN8 stiffness class. For stiffness class SN2 are used fittings of rigidity class SN4. The physical properties tested on multilayer pipes include also ring flexibility. The test consists in the deformation of up to 30% of the diameter of a pipe sample, and the requirement is that the pipe doesn’t break and returns to its original shape after the removal of the pushing force. 

Presentation of the PVC-U compact pipe system

Besides the multilayer PVC-U pipes, Teraplast also produces PVC-U pipes in the compact wall version. Obviously, in this case the wall structure is no longer of a multilayer type but is a compact structure in PVC-U. 

The mechanical properties of this type of pipe are the same as for multilayer pipes but the specific weight is higher. Teraplast produces this type of compact wall PVC-U pipe for exterior buried gravity sewage in accordance with SR EN1401-1 standard. 

The range of diameters is similar to that produced for multilayer pipes, respectively between 110mm and 500mm with ring rigidity SN4 (SDR41), SN8 (SDR34).  

The colour is orange RAL8023.  

The products are used for gravity household and industrial wastewater sewage outside the building, buried, with depth between 0.8 m and 6 m.

SN4 - street with average traffic load,

SN8 - medium or heavy load traffic.

The fittings used in this system are the same fittings that are also used for multilayer pipes, namely from injected PVC-U in the same dimension range as PVC-U pipes. Teraplast offers PVC-U fittings both in the SN4 stiffness class and in the SN8 stiffness class.

The physical properties tested on multilayer pipes include also ring flexibility. The test consists in the deformation of up to 30% of the diameter of a pipe sample, and the requirement is that the pipe doesn’t break and returns to its original shape after the removal of the pushing force.

Inspection chambers for external sewers

Inspection chambers for external sewers

The new generation of plastic manholes offer modern and ecological solutions that satisfy all the requirements regarding wastewater evacuation. Through the use of modern plastic manholes is ensured a complete tightness of the sewage network due to the sealed joints between these and the plastic pipes, thus the concrete manholes, the only elements from the sewage system (made today mainly with plastic pipes) that were not able to ensure the network tightness, are eliminated.   

The plastic manholes area of use is similar with the one of plastic sewage pipes, covering both buried sewage networks for wastewater and rainwater applicable for infrastructure and residential buildings, water evacuation in agriculture and industry or for drainage. The maximum temperature of the wastewater transported is the same as the one of the pipes that will be used for that network.    

Main features and advantages of plastic manholes

Tightness

The manhole raft is foreseen with sockets with elastomeric gaskets in order to ensure a perfectly seal joint with the plastic sewage pipe used in the sewage networks. The elements of the modular manholes are also sealing among them with the help of gaskets. This guarantees an absolute tightness of the sewage system. Manhole tightness is tested at a pressure of 0.5 bars.  

Hydraulic features

The plastic sewage manholes are foreseen with optimum flow profiles that ensure a safe water flow and eliminate the risk of water network clogging due to manhole obstruction

Resistance to chemicals

Plastic manholes, like pipes, have an extremely high resistance to the abrasion and aggression of certain chemicals that can be found in wastewater (such as sulphuric acid).  

Resistant and robust

Plastic manholes have all the advantages provided by this material: robustness, shape stability and flexibility. As it is well known, plastic products flexibility provides them better long-term durability than the rigid (concrete) because they have a better resistance to subsequent load charges. 

Simple installation and economic efficiency

All the components have a reduced weight that allows to be handled by one person (maximum 2 for large diameter manholes), which makes the installation easier and faster, without additional costs generated by other machineries.

Beside fast installation and simple handling it must be taken into consideration also the easier transport at a lower cost as well as the reduced space necessary for storage.

Lifetime

The estimated lifetime for this type of manholes is of 50 years, similar lifetime with the one of PVC pipes, proven in this case. All these features lead to numerous advantages for the companies that manage the sewage networks and their beneficiaries due to the savings that can be obtained as a result of: 

  • Lack of long-term repairs costs.
  • Reduced maintenance costs.
  • Reduced water treatment costs due to the elimination of groundwater infiltrations in the sewage. 
  • Eliminate the cost of soil pollution fines due to seepage.

Manholes with column from smooth pipe

Manholes with column from smooth pipe are modular, multi-element manholes that are recommended to be used in private parking, network connections and green spaces but as well in municipal, industrial or residential and commercial networks through the use of cast iron covers and other accessories for traffic.      

The maximum burying level is 6 m and the maximum level of the groundwater is 5 m. A manhole has three basic elements: 

  • The manhole raft (base);
  • Manhole column;
  • Manhole cover.

A.1. manhole subgroup contains 3 types of manholes with elevation column from smooth PVC pipe: D200, D315, and D400mm. 

Manholes with column from corrugated pipe

General information regarding plastic manholes, their advantages as well as the technical and economic arguments for their use are described at the beginning of the manhole chapter.   

Manholes with column from corrugated pipe are also are modular, multi-element and are recommended to be used in private parking, network connections and green spaces but as well in municipal, industrial or residential and commercial networks through the use of cast iron covers and other accessories for traffic. 

The maximum burying level is 6 m and the maximum level of the groundwater is 5 m. A manhole has three basic elements:

  • The manhole raft (base);
  • Manhole column;
  • Manhole cover.

A.2. manhole subgroup contains 5 types of manholes with elevation column from corrugated pipe: D340, D353, D355, D670-Tegra 600 and D630-Pro630.

The “D” initial refers to the exterior diameter of the corrugated column for manhole elevation. 

Manholes for external sewers

Manholes for external sewers

The new generation of plastic manholes offer modern and ecological solutions that satisfy all the requirements regarding wastewater evacuation. Through the use of modern plastic manholes is ensured a complete tightness of the sewage network due to the sealed joints between these and the plastic pipes, thus the concrete manholes, the only elements from the sewage system (made today mainly with plastic pipes) that were not able to ensure the network tightness, are eliminated

The plastic manholes area of use is similar with the one of plastic sewage pipes, covering both buried sewage networks for wastewater and rainwater applicable for infrastructure and residential buildings, water evacuation in agriculture and industry or for drainage. The maximum temperature of the wastewater transported is the same as the one of the pipes that will be used for that network.

Main features and advantages of plastic manholes

TIGHTNESS

The manhole raft is foreseen with sockets with elastomeric gaskets in order to ensure a perfectly seal joint with the plastic sewage pipe used in the sewage networks. The elements of the modular manholes are also sealing among them with the help of gaskets. This guarantees an absolute tightness of the sewage system. Manhole tightness is tested at a pressure of 0.5 bars.

HYDRAULIC FEATURES

The plastic sewage manholes are foreseen with optimum flow profiles that ensure a safe water flow and eliminate the risk of water network clogging due to manhole obstruction.

RESISTANCE TO CHEMICALS

Plastic manholes, like pipes, have an extremely high resistance to the abrasion and aggression of certain chemicals that can be found in wastewater (such as sulphuric acid).

RESISTANT AND ROBUST

Plastic manholes have all the advantages provided by this material: robustness, shape stability and flexibility. As it is well known, plastic products flexibility provides them better long-term durability than the rigid (concrete) because they have a better resistance to subsequent load charges.

SIMPLE INSTALLATION AND ECONOMIC EFFICIENCY

All the components have a reduced weight that allows to be handled by one person (maximum 2 for large diameter manholes), which makes the installation easier and faster, without additional costs generated by other machineries.

Beside fast installation and simple handling it must be taken into consideration also the easier transport at a lower cost as well as the reduced space necessary for storage.

LIFETIME

The estimated lifetime for this type of manholes is of 50 years, similar lifetime with the one of PVC pipes, proven in this case. All these features lead to numerous advantages for the companies that manage the sewage networks and their beneficiaries due to the savings that can be obtained as a result of:

  • Lack of long-term repairs costs.
  • Reduced maintenance costs.
  • Reduced water treatment costs due to the elimination of groundwater infiltrations in the sewage.
  • Eliminate the cost of soil pollution fines due to seepage.

Manholes from multi-element plastic

General information regarding plastic manholes, their advantages as well as the technical and economic arguments for their use are described at the beginning of the manhole chapter

Manholes are also are modular, multi-element and are recommended to be used in infrastructure, in municipal, industrial or residential and commercial networks on collectors with a diameter up to 400 mm through the use of cast iron covers and other accessories for traffic.  

These types of manholes were designed to be installed to depths up to 6 m, including in areas with high level of groundwater. Reference standards: EN 13598-2; EN 14982; EN 14396; ISO 9969; EN14830.  

Manholes are made through injection from PP (polypropylene) and are made out of three basic elements: 

  • The manhole raft (base)
  • The manhole elevation column
  • The manhole cone

According to our classification the B.1. manhole subgroup contains 3 types of manholes: Pro 800, Pro 1000 and Tegra 1000NG. In this case, unlike for corrugated manholes where we relate to the exterior diameter of the corrugated elevation column, the values specified refer to the interior diameter of the manhole (column).  

Manholes from single block plastic

General information regarding plastic manholes, their advantages as well as the technical and economic arguments for their use are described at the beginning of the manhole chapter. 

Single block manholes are made from one element with different heights and are recommended to be used in infrastructure, in municipal, industrial or residential and commercial networks installed on collectors with a diameter up to 500 mm through the use of cast iron covers and other accessories for traffic.   

These types of manholes were designed to be installed to depths up to 4 m. Please contact us to provide you the special installation instructions for areas with high groundwater levels. Single block manholes are made from polyethylene through the process called “rotomoulding” or rotational moulding. This is a process that allows the individual rotation of the model when the polyethylene powder is introduced into two directions. Through this process can be obtained large size products with different shapes.   

In order to simplify the installation of these manholes were developed telescope covers. In case of manholes, unlike for corrugated manholes where we relate to the exterior diameter of the corrugated elevation column, the values specified refer to the interior diameter of the manhole.

Manholes for external sewers

Manholes for external sewers

Covers are a closing and protection element for the manholes in the sewage or water supply network. Grates represent protection elements and they capture rain wastewater especially in case of drains.

Given their location at soil level, these are exposed to numerous types of demands, especially mechanical due to the charge exercised by the passengers or vehicles that travel above them.

In this regard the covers and the grates are classified into several classes according to the EN124 standard.

Group 1 - A15 – 1.5 tones/axle (15kN) – for areas with pedestrian traffic, alleys, courtyards or bicycle lines.

Group 2 - B125 – 12.5 tones/axle (125kN) – reduced traffic (parking with weight restrictions, markets, private roads, parking).

Group 3 - C250 – 25 tones/axle (250kN) – roads, roads for easy commercial vehicles, parking for vehicles up to 25 tones, drainage.

Group 4 - D400 – 40 tones/axle (400kN) – roads for heavy vehicles, highways, parking areas for all types of vehicles.

The classification includes also:

Class E600 – 60 tones/axle (600kN) – areas with heavy and very heavy traffic (ports, airports).

Class F900 – 90 tones/axle (900kN) – exceptional vehicles, ports, airports, etc.

Teraplast offers a wide range of covers and grates of different sizes and resistance made from the traditional material, cast iron, as well as from new generation material such as composite materials.

COVERS AND GRATES IN DUCTILE CAST IRON

The covers and grates offered by Teraplast are black and are made from ductile cast iron by casting. They are delivered as an assembly made from frame + cover. In certain situations the two components are joint through a hinge.

Ductile cast iron offers a higher elasticity and tear resistance to the product, thus, lately it became more popular the traditional grey cast iron. Ductile cast iron has a higher safety rate compared to the grey cast iron, due to the fact that it allows higher stress when it is submitted to certain charges and it returns to the initial state once these have disappeared.

The corrosion resistance degree is also higher and the degree of cracks spreading is much lower due to the presence of graphite in nodular shape not in lamellar shape as it is in the grey cast iron.

COVERS AND GRATES IN COMPOSITE MATERIAL

In order to respond to the market demands, Teraplast completed its range of covers with a new range of covers and grates made out of composite materials. The covers and grates offered by Teraplast are made out of a patented, modern and innovative composite material (KinextTM).

This innovative composite material allows the production of manhole covers with a higher resistance to charges. Hereinafter, will state several advantages due to the use of these types of covers.

Reduced weight – the composite covers made out of KinextTM are 70% lighter than the similar covers in cast iron, thus these reduce the handling costs and especially the transport cost.

With high resistance to stress and breaking – the composite covers have a higher resistance to stress and breaking under the charge, these being easily classified in the resistance classes in accordance with EN124 standard.

Reduce the noise level – the composite covers reduce significantly sound pollution. KinextTM has a lower density than cast iron and it reduces the noise and inconveniences caused by the vehicles that cross over the installed manholes covers.

Electrical insulation – the covers can be installed for pedestrian traffic areas. . KinextTM is nonconductive, thus these covers protect the pedestrians especially against voltage dispersions, especially in humid environments.

Corrosion resistance – KinextTM resists to chemicals and it does not rust or chordates due to constant exposure to atmosphere agents. For this reason, the covers don’t need to be repainted and the products are ideal for areas with flammable liquids such as gas stations, storage installations, as they reduce significantly the risk of fire as result of a sparkle as it is the case for ferrous materials.

Anti-theft – the scrap value continues to increase and the number of thefts has a high impact on the costs incurred by the local authorities and the services companies. Besides the economic impact caused by the product theft there is also the risk of sever accidents caused by the holes in the road. Composite covers have no value (or an extremely low value) for the companies that recycle different types of materials

Resistance to temperature changes – the covers were tested at -30°C și +150°C and have maintained the same features, that is why they are suitable for extremely hot or cold areas

Permeability to electromagnetic waves – due to RFID (identified through radio frequency) the “Smart cover” is the manhole cover that allows you to:

  • To receive and send without battery when it is questioned by a reader.
  • To be located in case it is covered with asphalt.
  • You have all the information related to what it is inside the manhole.
  • Registers the maintenance actions.
  • Has a unique product registration (each cover has its own number on the microchip).

Corrugated PE pipes and fittings for external sewers

Corrugated PE pipes and fittings for external sewers

The system is made out of PE corrugated pipes and fittings. The pipes are made through co-extrusion, in accordance with the SR EN13476-3:2007 standard, resulting a pipe with a smooth light colour interior wall that facilities video inspection, with an extremely reduced roughness and a profiled type exterior wall.
The profiled exterior wall provides resistance to external charges, being characterized by a very good resistance. The profiled structure of the exterior wall presents a number of major advantages: it is thinner than a smooth wall for the same pipe resistance which leads to a lower specific weight of the
pipes.


In order to resist to the devastating effect of solar radiation, the exterior walls of corrugates pipes are made out of materials that were stabilized against ultraviolet radiation. PEHD corrugated pipes, fittings and accessories are used for external buried networks for rainwater and wastewater sewage, anti-flood systems, roads and rail road undercrossing, in free flow conditions (non-pressure) with temperatures up to maximum +50°C (accidental temperature increases up to +50% are accepted for short periods of time) and with pH between 2 and 12.
The range of diameters varies between 200 mm and 1200 mm and the ring stiffness (according to conform EN ISO 9969) in SN4 and SN8 classes.


Depending on the joining, the pipes are produced with or without socket, with standard lengths of 6.21 m for the pipes provided with socket and of 6 m for the pipes without socket. The pipe joining is done using O-ring gaskets from synthetic rubber (EPDM, SBR, NBR), ensuring the system’s sealing.
The gasket geometry ensures the continuity of the interior wall of the pipes joint, leading to good hydrodynamic features for the transport of fluids, without places where solid material can accumulate and that can generate turbulences.

The ring stiffness (SN) in the joining area is ensured trough the overlapping of the socket over the profiles of the next pipe.

Corrugated PP pipes and fittings for external sewers

Corrugated PP pipes and fittings for external sewers

The pipes are made through co-extrusion, in accordance with the SR EN13476-3:2007 standard, resulting a pipe with a smooth light colour interior wall that facilities video inspection, with an extremely reduced roughness and a profiled type exterior wall.
The profiled exterior wall provides resistance to external charges, being characterized by a very good resistance. The profiled structure of the exterior wall presents a number of major advantages: it is thinner than a smooth wall for the same pipe resistance which leads to a lower specific weight of the
pipes.

In order to resist to the devastating effect of solar radiation, the exterior walls of corrugates pipes are made out of materials that were stabilized against ultraviolet radiation.
PP corrugated pipes, fittings and accessories are used for external buried networks for rainwater and wastewater sewage, anti-flood systems, roads and rail road undercrossing, in free flow conditions (non-pressure) with temperatures up to maximum 60°C and max. 95° – 100°C for short periods of time, with pH between 2 and 12.
The system is made out of PP corrugated pipes and fittings included in the SN8 (8kN/square meter) stiffness class. In what concerns the size, the pipes are differentiated based on their diameter into:
1. DN/OD pipes – the diameter indicated in the exterior diameter of the pipe.
2. DN/ID pipes – the diameter indicated is the interior diameter of the pipe.
Each of these ranges has its own range of fittings.
The diameter range varies between 160 mm and 1000 mm.
The pipe joining is done using O-ring gaskets from synthetic rubber (EPDM, SBR, NBR), ensuring the
system sealing.

The gasket geometry ensures the continuity of the interior wall of the pipes joint, leading to good hydrodynamic features for the transport of fluids, without places where solid material can accumulate and that can generate turbulences.

Drainage pipes and fittings

Drainage pipes and fittings

As an expert in the field of solutions for sewage networks, Teraplast completes its portfolio with water drainage systems, making available for its clients three drainage systems they can choose depending on the type of work they undertake, thus:  

  • The drainage system that uses stiff pipes with PVC slots with compact wall  
  • The drainage system that uses flexible pipes with corrugated PVC slots   
  • The drainage system that uses flexible pipes with corrugated PE slots with double wall

All these systems can be used for groundwater drainage for various applications such as surface drainage systems, deep drainage, undercrossing and drainage for roads, railways, stadium constructions, but also other civil or industrial engineering, water facilities or different applications in agriculture. Choosing the optimal solution, respectively the system, is done depending on the application to be put into operation and the rigidity requirements imposed by the application

The lifetime of drainage systems made of PVC or PE is estimated to be minimum 50 years. 

These high corrosion resistant systems can be installed simply and extremely quickly, especially in the case of systems that have the pipes supplied in the coils. Maintenance and cleaning of systems can be done easily. 

The drainage system with still pipes and PVC slots with compact wall

Teraplast produces PVC pipes with compact wall, stiff, for drainage, foreseen with elastomeric gasket and socket, with diameters between 110 and 400 mm, in SN4 and SN8 ring rigidity classes. The pipes are made in bars with installed socket and gasket, with lengths of 6m.

This type of system is used to drain underground water, especially in special conditions when the static and dynamic loads are high, such as railway applications, high class loading roads, etc. In addition to the classical applications described above, this type of system can also be used to collect leachate in solid waste landfills or to capture biogas from domestic landfills.  

The max. acceptable flow temperature of the fluid is 60°C.

The physicochemical features and, implicitly, the advantages of this system are similar to those of the PVC-U system described in the chapter PVC-U Pipes and Fittings for external sewers.  

The drainage pipes are manufactured according to the SF 97/2015 standard by performing additional milling of some slots on the circumference of compact PVC pipes with the help of specialized machine. The slots are made perpendicular to the pipe axis.

The slots are 1.00 mm and 2.00 mm in size with a distance of 10.00 mm between them. 

The pipes can be made with 1, 2, 3 or 4 rows of slots. The opening degree depends on the number of rows of slots executed.  

Thus will have :

  • With 4 rows of slots - 360°
  • With 3 rows of slots - 270°
  • With 2 rows of slots - 180°
  • With 1 row of slots - 90°

For this type of pipes can be used the fittings injected from PVC SN 4 or SN 8, presented in detail in the PVC-U pipes and fittings chapter for exterior sewage whit whom are perfectly compatible.

The drainage system with flexible pipes with corrugated PVC slots

The flexible corrugated PVC pipe system for drainage is a complete system that contains PVC pipes with a single wall, that are used especially to drain groundwater for residential buildings, to protect against moist and groundwater, that acts on foundations and walls, on the side of the roads, outside traffic areas, sports fields or in agriculture, to drain grasslands or other lands or for the dissipation and infiltration of water from small water cleaning stations. In general, the use of this system is recommended for relatively simple applications that do not require ring rigidity.    

The diameter range of this system comprises pipes with a diameter between 50 and 160 mm

The pipes are produced and delivered in coils with lengths of 50 m. Each coil is provided with a special double socket for connection to the next section. The pipes are also available and can also be ordered with a synthetic filter coating. (Pipes are coated in a geotextile cloth).

The max. acceptable flow temperature of the fluid is 60°C.  

The drainage pipes are manufactured through extrusion according to SR EN61386-23: 2004 standard, by making some slots on the circumference of corrugated PVC pipes with the help of specialized machine. The slots are made perpendicular to the pipe generator. The pipes are provided with slots all around the circumference (360 °). The correspondence between the number of slots per section and on the free take-over area (in cm2 / m) can be found in the following part of the catalogue that details this range. The system is complemented by a range of injected fittings created especially for this type of pipe. 

The drainage system with flexible pipes with corrugated PE slots with double wall

The corrugated flexible polyethylene drainage system for drainage is a complete system that contains double-wall corrugated PE pipes that are used in surface and deep drainage systems, undercrossing and drainage for roads, railways, stadium construction, and other civil or industrial engineering, or other applications where high ring rigidity is required. 

The corrugated pipes have the interior wall smooth, from medium density polyethylene, and the exterior wall, from high density polyethylene, profiled and glued to the interior inside in the contact areas. The corrugated structure ensures pipeline flexibility and minimal material consumption per unit of length for a given diameter and ring rigidity. 

The system comprises flexible PE pipes for double wall drainage with diameters between 90 and 200 mm in the ring rigidity classes SN4, SN8 according to EN ISO 9969. 

The external shock resistance is in accordance with EN744 and the ring flexibility according to EN1446

The pipes are produced and delivered in coils of different lengths, depending on the diameter of the pipe. Each coil is provided with a special double socket for connection to the next section.

The max. acceptable flow temperature of the fluid is 40°C.  

The drainage pipes are manufactured according to the SR EN 13476-3: 2009 standard, by making slots on the circumference of corrugated PE pipes with the help of specialized machine. The slots are made perpendicular to the pipe generator.

The pipes are provided with three types of slots: 360 °, 225 ° and 135 °. The slots through which water penetrates into the tube are symmetrically located on the circumference and along the entire length of the pipe. These perforations occupy approximately between 50 and 100 cm2 / m2 of the surface of the pipe for free water flow depending on the perforation option. 

The correspondence between the number of slots per section and on the free take-over area (in cm2 / m) can be found in the following part of the catalogue that details this range.

The system is complemented by a range of injected fittings created especially for this type of pipe.

Septic tanks and separators

Septic tanks and separators

 

Description of the hydrocarbon separators range

Hydrocarbon separators are design according to the EN858 and DIN 1999-10 standards. 

The hydrocarbon separators offered by Teraplast are made from polyethylene through the process called “rotomoulding” or rotational moulding. This is a process that allows the individual rotation of the model when the polyethylene powder is introduced into two directions. Through this process can be obtained large size products with different shapes.

Hydrocarbon and oil separators are necessary where there are light liquid leakages. These appear usually at:

  • gas stations;
  • car wash;
  • car repair shops;
  • parking.

The range of hydrocarbon separators offered by Teraplast  

Hydrocarbon separator class I

Designed to reach a concentration lower than 5 mg of oil per liter in standard testing conditions, these separators will be used when it is necessary to remove very small drops of oil. In order to improve the separation effect in the separator, a coalescing filter is installed in front of the exit connection.

When the water goes through the filter, small drops of oil combine to create larger drops that are detached afterwards from the coalescing material and rise to the surface. A special intake system produces a buffer-flow effect in the separator. This slows the intake flow and distributes it efficiently in the separation space. The heavy particles go in the lower side and are separated and the easy particle rise in the upper side and are separated there.  

Hydrocarbon separator class II

Designed to reach a concentration lower than 100 mg of oil per liter in standard testing conditions, these separators are ideal for usage in case it is applied a lower quality request. 

Hydrocarbon separator with by-pass  

By-pass separators treat entirely all the debits generated by the rainfall rates up to 6.5mm/hour (99% of rainfalls). These separators are used in parking areas when it is considered an acceptable risk the insurance of a complete treatment for high debits. For example, when the risk of a significant hydrocarbon leak and heavy rains at the same time is small.  

Description of the grease separator range

In order to prevent the deterioration of sewage pipes and water cleaning stations, in the activities that produce wastewaters that contain grease, the grease separators need to be installed in accordance with the EN1825 and DIN 4040-100 standards. These reduce incidents such as kitchen clogged pipes, improve septic tank performance, and prevent the contamination of small water cleaning stations. 

The grease separators offered by Teraplast are made from polyethylene. They are extremely durable, with reduced waste and are resistant to different chemicals used in the kitchen.

The grease separator needs to be installed near a contamination source, inside or ouside the building.

The grease separator located underground, needs to be near the building, in areas where strong and aggressive smells will not be a problem and in the area where it is possible the access using the collecting hose of the vacuum truck. 

The level of the intake connection needs to be below the freezing level. The grease separator needs to be opened in order to be emptied. 

PE sewer pipes and fittings

PE sewer pipes and fittings

The polyethylene pipe and fittings system for sewage. The polyethylene pipes are produced through polyethylene granules extrusion (PE80 or PE100).  

The polyethylene pipes have a smooth interior and exterior side, are flexible and resist to exterior temperatures up to -30°C. The polyethylene pipes and fittings are used in numerous fields out of which we mention: 

  • Sewage network in gravity system or in pressure
  • Internal sewage for construction.

The estimated lifetime is of minimum 50 years, on the condition that the pressure and temperature as well as installation technologies are followed.

The polyethylene pipes and fittings are known for their use in gas and water supply and distribution networks, but they are also successfully used in sewage systems gravity buried and especially in those for pressure.   

There are often situations when a certain part of the sewage system is in pressure system (pumped sewage). In these cases the most recommended system is the polyethylene pipe and fitting system due to the fact that the elements are joint through welding that ensures the system tightness in case of pressure higher than 0.5 bars, the test pressure for PVC sewage networks joint with socket and gasket. 

Although polyethylene pipes are produced for networks where pressures can reach up to 25 bar, in most cases in the sewage systems are used pipes with nominal pressures of 3.2 or 4 bar. Polyethylene pipes for sewage are black, without stripes or black with brown stripes.

The range of diameters for sewage pressure pipes offered by Terasplast is between 200 and 630 mm and is delivered into bars of 12 m long.

Here are some of the features and benefits of using polyethylene pipes and fittings.

Features and benefits of polyethylene pipe and fittings

Features and benefits of polyethylene pipe and fittings

HANDLING

The low weight of the PE pipe and fittings system components ensures an extremely high manoeuvrability in terms of transport, storage and handling as well as its installation.

PRESSURE LOSSES

The inner surface of the pipes and fittings is extremely smooth so that no material deposits can form inside and thus the pressure losses are minimized. 

ABRASION AND COROSSION RESISTANCE

These features allow the transport of fluids at speeds of over 7m / sec without erosion problems, even in case of acidic or alkaline substances with pH between 1 and 14.

USE IN SEISMIC AREAS

The flexibility and elasticity of polyethylene pipes recommends them for use in areas with seismic risk. 

WELDABILITY

It is a fuamental feature of this type of systendm. The system parts can be combined through various special welding technologies available for constructors

CHEMICAL RESISTANCE

Both PE pipes and fittings have a high chemical resistance to most aqueous solutions, to the aggressive action of soil materials, inorganic salts and most acids and bases even at high concentrations and high temperatures. 

FIRE BEHAVIOUR

From this point of view, polyethylene pipes are ignited and burn slowly, but they do not maintain combustion and are self-extinguishing (class C4). 

STATIC ELECTRICITY

The PE pipe is subject to electrostatic phenomena due to the high resistance of the material. Grounded pipes are subject to accumulation of charges due to the environment humidity and extensive network – land contact.