MT Multilayer Pipes the Stable Combiners

MT multilayer pipes The stable combiners

• Drinking water installations • Radiator connections • Special applications

DESIGNED FOR YOU. The high-performance partner Hewing – the reliable supplier for high-performance plastic pipe technology.

In Hewing GmbH’s plants, all processes are The company maintains strong, Hewing offers an extensive portfolio of pipe focused on the fulﬁ lment of individual client successful partnerships with its clients. solutions. Moreover, we develop customized requirements. products for market introduction in close cooperation with our customers.

Here, customers can benefit from a di- The components are used in drinking specifically defined training events and verse product range, which leaves nothing water installation, radiator connection and fl exible logistics. to be desired. Hewing provides custom surface regulation systems as well as in manufacturing according to clients’ speci- other special applications. Hewing clearly Environmental awareness is a signifi cant fi c requirements. This is ensured via: focuses on supplying companies who quality criterion for Hewing. From product provide complete systems. A successful development to manufacture and delivery, Sophisticated, fl exible production of concept on a global scale, the export it plays a decisive role. For example, thanks butt welded multilayer pipes quota is above 50 %. to the active environmental policy of the (MT multilayer pipes), company, production waste is 100 % re- the world’s largest manufacturing The service benef t cycled both in-house and externally. facility for physically cross-linked When you select Hewing, you select high polyethylene pipes (PE-Xc pipes), quality, without compromise. This also including two plants for physical applies to the versatile range of services cross-linking, accompanying its products, which is competent and innovative research specially designed to support system and development. suppliers in their work. It extends from research and development in co-operation with the client to marketing support, continuously available technical support,

O D

R = 5 x D

MT multilayer pipes featuring a Ideally suitable for construction as well as renovation: Bend radii of up to ﬁ ve times PE-Xc inner pipe can be expanded durable MT multilayer pipes. the external diameter are possible by up to 20 % using special tools – manually. without a loss in quality.

MT – combined benef ts

MT multilayer pipes are the material of protection against external influences the future, in particular in drinking water such as mechanical abrasion and con- installations and radiator connections. struction chemicals. Furthermore, the lightweight pipes are also deployed in specifi c designs for internal Stable in form and expandable gas installations and further applications. The positive properties of metal pipes are The material bond features the positive provided by the butt welded aluminium properties of plastic and aluminium. A plas- layer. It reinforces MT multilayer pipes in tic inner pipe – generally manufactured bends and over distances, enabling, for from physically cross-linked polyethylene example, greater fi xing intervals. They also (PE-Xc) – connected to the butt welded can be bent easily into tight radii – manu- aluminium layer via an adhesive is used for ally up to 5 times and using bending tools the transport of media. A subsequent up to 3.5 times the external diameter. This adhesive layer and the outer plastic layer facilitates installation and avoids the need follow, resulting in a premium product with for otherwise frequently required fi ttings. quality characteristics. Furthermore, the pipes feature minimal Corrosion-free and hygienic thermal expansion similar to those of metal Thanks to their plastic medium-carrier pipe, pipes thanks to the aluminium. In addition, MT multilayer pipes are corrosion-free they are also absolutely oxygen imper- in addition to preventing incrustations. meable – a signifi cant aspect in heating Furthermore, they minimise pressure los- applications. Further benefi ts derive from ses due to their extremely smooth surface. the butt welding process. The even layer When manufactured for drinking water structure provides for the same properties installations, they always feature medium- throughout the entire pipe circumference. carrying pipes made from PE-Xc – an Hence, MT multilayer pipes can be ex- irreproachable hygienic material – en- panded by up to 20 % using special tools suring adherence to regulations for the without a loss in quality, which has already transport of our primary foodstuff. In turn, enabled the development of innovative the outer plastic layer provides secure jointing technologies.

3 MT – Designed for you High-quality pipe technology, individually designed and manufactured. This is one of Hewing’s great advantages.

The classic MT multilayer pipe is based on MT multilayer pipes are designed specially The yellow MT Gas pipe enables modern PE-X technology and is deployed in drinking using PE-Xc medium pipes for drinking water multilayer pipe technology in internal gas water installations and radiator connections. installations. installations.

Clients can optimise product design to Plastic materials Dimensions precisely meet their system and applicati- Hewing can design the plastic layers of MT In general, MT multilayer pipes are avai- on requirements. Numerous parameters multilayer pipes (medium carrying inner lable in dimensions from 14 to 63 mm – for can be specifi ed individually for MT multi- pipe and outer layer) with different materi- in-wall or on-wall installation in general as layer pipes with their material combination als. Depending on the application area and well as for rising mains and cellar distri- of plastic and aluminium. Thus, Hewing the respective requirement profi le, these bution pipes. Both the internal and external provides the opportunity for clients to can be: diameter as well as the thickness of in- uniquely design their system technology dividual layers and overall pipe walls can via these pipes. PE-Xc (physically cross-linked be adjusted by Hewing to meet client polyethylene) based on PE-HD requirements or to fi t the desired jointing PE-Xc based on PE-MD technology. In particular, the ratio of alu- PE-HD (high density polyethylene) minium to plastic layers is signifi cant: If PE-MD (medium density polyethylene) the aluminium is suffi ciently thick, it be- PE-RT (polyethylene with raised comes the pressure-bearing element of temperature resistance) the entire pipe.

4 MT multilayer pipes are available in In-plant pre-insulated MT multilayer pipes Delivery of MT multilayer pipes is dimensions from 14 to 63 mm. provide true added value through noticeable implemented, upon client request, as a work facilitation on construction sites. coil or in straight lengths (c. f. photo).

DESIGNED FOR YOU. MT Gas multilayer pipes represent a mensions, test and quality marks as well special case: These specially designed as manufacturer’s labels, this can also MT pipes are approved in Germany in the contain further elements or information dimensions 16 and 20 mm, and in the such as logos, company descriptions and Netherlands in fi ve dimensions between application area(s). Traceability in the 16 and 40 mm (see page 13). framework of quality assurance is addition-ally ensured at all times via the inscri- Fitting compatibility bed internal identification number and The precise adjustment of MT multilayer metre marking. pipes towards the required jointing technology is closely associated with Colour the selection of dimension. In addition to Both the medium carrying plastic inner pipe the required know-how, Hewing also and the plastic outer layer of MT multi- provides clients with the corresponding layer pipes can be produced in colours en- test technology for the assessment of tirely according to client requirements at specifi c pipe / fi tting combinations. Profes- the fl exible Hewing plant. Thus, pipe colour sional support regarding system-specifi c can be easily coordinated to match the fi tting development is also available on re- client’s corporate design. quest. In general, MT multilayer pipes are suitable for all customary fi ttings on the Insulation market – from press and sliding sleeve Pre-insulated MT multilayer pipes facili- fi ttings to clamp ring and push-fi t fi ttings. tate the installation on the construction site. They also simplify compliance with Pipe lengths the relevant insulating standards and MT multilayer pipes can be supplied as regulations. They are available with strong straight length products (according to di- PE all-round insulation (with or without mensions) as well as coils of up to 200 m in additional moisture protection), asymme- length. Delivery is generally in customer- trical insulation or even with corrugated specifi c card boxes or on customer-specifi c protective pipes / in a Twinpipe as a 'pipe- coils. in-pipe' solution.

Signature Each pipe receives a special signature with relevant, client-speciﬁ c information. In addition to necessary technical information e.g. regarding pipe materials, di-

5 Two materials in perfect harmony Five layers are unif ed as a homogenous, high-quality product in the f exible MT multilayer pipe production.

Hewing uses aluminium bands featuring Aluminium is butt welded in a TIG process. Production incorporates many quality thicknesses of up to 1.5 mm for the control checks: e.g. dimension monitoring manufacture of MT multilayer pipes. on the external diameter.

A sophisticated production process is nesses and the use of different plastic between 0.2 and 1.5 mm for MT multilayer available at Hewing for the manufacture of materials for the medium carrying inner pipes according to pipe dimensions and different types of MT multilayer pipe en- pipe and the outer layer. client requirements. abling fl exible production according to client requirements – featuring optimal qua- Butt welded for impressive benef ts Finished MT multilayer pipes are marked lity at all times. The durable, solid A signifi cant core process in the manu- at the end of the production lines and cut connection of the plastic layers with the facture of all types of Hewing MT multi- to length as straight lengths or wound embedded aluminium layer is ensured layer pipes is the longitudinal butt welding into coils according to client requirements. using optimised adhesives. TIG process. No overlapping of material Subsequent insertion into corrugated is needed and the fi nished pipe features pipes and/or insulation with symmetrical A unique aspect of the Hewing production identical properties at every point around all-around or asymmetrical jacket are process is the manufacture of the medium its entire circumference thanks to this possible. Finally, packaging is implemented carrying inner pipe, the two adhesive processing. A test immediately subse- according to the respective requirements layers and the plastic outer layer with quent to this production step ensures of the client. separate extruders. Only this sophisticated that the welding seam is implemented production technology enables the exact irreproachably at all times. Hewing pro- adjustment of the individual layer thick- cesses aluminium bands with thicknesses

6 The secure bond between all MT multilayer pipes must withstand more than 100,000 load On request, Hewing coordinates layers is monitored in the scope changes during the ﬂ exural fatigue test. entire certiﬁ cation projects for of tensile tests. clients and carries out the required tests on in-house test facilities.

Proven and tested Hewing quality

Stringent quality controls accompany Testing programmes for clients the entire MT multilayer product supply The Hewing testing and quality assurance process in the scope of in-plant and laboratory also supports clients in the third-party monitoring. These commence integration of Hewing products into their with monitoring of incoming raw materials complete systems. Client-specifi c testing and continue until distribution of the programmes can comprise of both approv- finished products. Thus, even the raw al tests and tests during development. materials supplied are thoroughly checked This enables Hewing to implement virtually upon delivery for absolute adherence to all relevant required certification tests Hewing specifi cations. During production on accredited test facilities. This saves monitoring units check every detail such valuable time and money. Tests during the as dimensions, layers and wall thickness development generate clarity regarding as well as the quality of the aluminium the functionality and practicability of welding seam automatically. new pipes, fi ttings and components. This ensures that only optimised products and Samples from each batch of MT multi- systems, which meet the specified re- layer pipes must complete numerous high quirements, reach the official approval performance tests and application simula- tests. tions successfully: e.g. thermal cycling and fl exural fatigue tests, vibration load and Clients have real experts at their disposal pressure surge tests as well as simulated with Hewing: They possess exceptional radiator connections. Furthermore, adhe- know-how in development and certifi cati- sive tests monitor the secure, durable bond on projects through intensive cooperation between all layers. The outstanding dura- with national and international testing in- bility of MT multilayer pipes is proven stitutes, and collaboration with numerous continually in the scope of creep strength standardisation and specialist panels as tests. All test records are archived for at well as expert organisations. least ten years and maintain records of every metre of pipe manufactured.

7 MT multilayer pipes in drinking water installations The layer composition of hygienically irreproachable MT multilayer pipes is predestined for implementation in drinking water installations.

MT multilayer pipes have no impact Even exposed on masonry, MT multilayer pipes Featuring a PE-Xc inner pipe, MT multilayer pipes whatsoever on the quality of our primary provide for clean installations . are also ideally suited both for radiator foodstuff. connections and drinking water installations.

Hewing MT multilayer pipes for the trans- The pipes are even resistant against third-party monitoring on both raw materi- port of drinking water always incorporate possible future modifi cations to drinking als and fi nished pipes implemented by the PE-Xc medium carrying inner pipes. water properties – as in contrast to many German Technical and Scientifi c Associa- Hence, they are absolutely hygienic and alternative materials, they are unaffected tion for Gas and Water’s (DVGW) Water do not impact the quality of drinking water by fl uctuating or permanently low pH values. Technology Centre, Water and Corrosion in the slightest. The water only comes Test Laboratory, Karlsruhe (TZW). Fur- into contact with PE-Xc, which is particu- All requirements met thermore, it is ensured the pipes adhere larly suitable for this application. Pitting or MT multilayer pipes featuring a PE-Xc to requirements regarding the growth of tensile fracture corrosion as well as re- inner pipe adhere to all relevant regulati- microorganisms on materials for the sulting pipe bursts do not occur, the pipes ons and guidelines: e.g. in Germany, drinking water sector according to do not react with substances dissolved in the drinking water regulation (TrinkwVO) DVGW work sheet W 270. Additional water and no harmful metal ions are as well as the requirements of the KTW ongoing third party monitoring is im- deposited into our primary foodstuff. In- recommendations for health evaluation plemented by e.g. the Materialprüfanstalt crustations are prevented effectively of plastics within the framework of the Darmstadt (MPA DA), the Material- thanks to the smooth inner pipe surface German Foodstuffs and Commodities Act prüfungsamt NRW (MPA NRW), the Süd- and algae growth is also eliminated as for the drinking water sector (BGVV). deutsche Kunststoffzentrum (SKZ), Hy- the aluminium layer is light impermeable, gieneinstitut des Ruhrgebietes (HY), the protecting the drinking water against the The proof that regulations and limit values DVGW as well as the Dansk Teknologisk infl uence of UV rays. are adhered to is provided via continuous Institut (DK), KIWA (Ned.) and NSF (US).

8 MT multilayer pipes enable “cold” connection Permanent organoleptic tests with regard The pipes resist temperatures of up to 95° C techniques such as press connections: soldering to odour and ﬂ avour prove that the materials and pressures of up to 10 bar – substantiated or welding is unnecessary. deployed do not impact drinking water. by the thermal cycling test according to DVGW work sheet W 534, which is an obligatory test for approval in drinking water installations in Germany.

Easy bending, saving f ttings often selected e.g. for the connection of In particular, MT multilayer pipes feature armatures in basements, garages or attics. installation advantages vis-à-vis metal pipes – not least as they are easy to bend For fl oor distribution, MT multilayer pipes and stable in form. Hence, obstacles can are generally deployed as a “pipe-in-pipe” be circumvented with ease, pipes can be solution inserted in protective pipes. laid around corners as well as enabling With the insulating air barrier between changes of direction in restricted spaces the water carrying pipe and the protective – without the complicated, expensive use pipe, they comply with the requirements of additional fi ttings. of DIN 1988. In order to adhere to special insulation regulations, e.g. on heating and Thus, they are ideally suitable for use in the build-up of condensation, Hewing also Hewing MT multilayer pipes designed for renovation projects. An additional reason supplies pre-insulated MT multilayer pipes drinking water installations are approved by the DVGW amongst others for this is fi re protection, as MT multilayer pipes featuring symmetrical or asymmetrical in- sensitive application area. are processed featuring “cold” connection sulation, eliminating unnecessary work techniques. Furthermore, the “fl ow rule” steps on the construction site. defining the sequence in which certain pipe materials must be installed in the fl ow direction can be disregarded in connection to existing pipe networks. This rule must be observed with regard to most metal pipes for the prevention of electrochemical corrosion.

Installation also in low constructions The relatively low external diameter of the MT multilayer pipe is particularly positive with regard to the T-piece or distributor installations. Hence, they can be integrated easily in low ﬂ oor or wall constructions. Thanks to the plastic outer layer of the pipes for protection against external corrosion, free installation on the wall is possible with just a few attachment points. This on-wall installation option is

9 MT multilayer pipes for radiator connection Radiators are connected securely, rapidly and cleanly using MT multilayer pipes.

Installation in skirting boards is easy with The pipes can be fed around corners without Hewing also provides MT multilayer pipes MT multilayer pipes. additional ﬁ ttings due to their excellent bend for radiator connection with insulation applied properties. in-plant in order to meet insulation requirements.

Multilayer pipes featuring PE-Xc medium Furthermore, MT multilayer pipes from “Cold” connections for carrying inner pipes meet high tempera- Hewing are also ideal with regard to increased security ture and pressure requirements for appli- installation – not least thanks to their A further argument in favour of MT multi- cations of up to 95° C and 10 bar. This is combined fl exibility and stability. In addi- layer pipes are “cold” connection tech- proven by tests implemented under per- tion, the lightweight pipes are easy to niques, e.g. using press or clamp fi ttings. manent in-plant and third party monitoring. handle and enable rapid, clean and Installation of these connections is rapid The very low noise transmission, in parti- effi cient assembly – even in a cold in- and safe, permanently tight and to be cular vis-à-vis metal pipes, is especially stallation. As pipes can be produced on recommended with particular regard to fi re benefi cial to subsequent users: disturbing request in extensive supply lengths as protection. Welding or soldering is no noises caused by the fl ow of water are a coils rather than straight lengths, even longer required, removing a potential thing of the past. long-distance connections without fit- source of risk for fi res and injuries. tings are possible. Furthermore, this also results in minimal cutting on construction Adherence to national and global insu- sites. lation regulations – e.g. with regard to

10 MT multilayer pipes remain “in permanent shape” In vibration tests the pipes demonstrate their The aluminium layer integrated in plastic after being bent in the correct direction. resistance to such loads, which cause problems ensures 100 % oxygen impermeability of for many other materials. MT multilayer pipes.

heat insulation and condensation – can rosion by their plastic outer layer whilst also be “provided” in-plant by Hewing: the stable aluminium layer enables greater with directly applied symmetrical or fixing distances. This reduces the asymmetrical insulation solutions. They complexity and expense of assembly avoid diffi cult, time-consuming insertion signifi cantly. of the pipes into insulation sleeves on-site. Renovation professionals Flexible installations As bracing walls as well as subsequent Implementation of entire pipe installations wallpapering or painting are not required, with MT multilayer pipes is possible with free laying of pipes is particularly popular the range of dimensions between 14 and in renovation projects. Hence, MT multi- 63 mm – from heat source to radiators. layer pipes can be adapted easily to all Furthermore, they are suitable for diverse areas: featuring tight bend radii of up to installation techniques, for example, for 5 times the external diameter manually the most popular fl oor distribution variant and 3.5 times external diameter using a from the fl oor manifold or from the risers bending tool. Elbow shaped fi ttings – for underneath the screed to the radiator. example in internal and external corners, The multilayer pipe, which can also be de- bumps as well as bypasses – are there- ployed inserted into a corrugated pipe as fore unnecessary in general, saving time a “pipe-in-pipe” solution, is installed either and expenses. This is even more signifi cant in the insulation layer below the screed as freely installed pipes are mainly fed to or directly in the screed if no insulation radiators under fl at and optically approp- layer is present. Here, the pipes benefi t riate skirting boards. MT multilayer pipes from their chemical resistance due to the further benefi t from minimal thermal ex- plastic outer layer, providing protection pansion thanks to their aluminium layer. against e.g. sometimes aggressive screed components.

Even on-wall installation of the ﬂ oor distribution to radiators, of pipes under the cellar ceiling or of risers to the different floors is easily possible. MT multilayer pipes are protected against external cor-

11 MT multilayer pipes for special applications Thanks to their special material combination, MT multilayer pipes are suitable for many additional applications.

The expandability of MT multilayer pipes The stability also provides advantages in Pre-insulated MT multilayer pipes are also features signifi cant benefi ts e.g. for compressed assembly of networks, for example for the perfectly suitable for use in cooling networks. air applications. transport of compressed air: Bends can be produced easily without fi ttings.

The combined advantages of plastic and losses. Cross-section constrictions can be Pre-insulated cooling ducts aluminium are also benefi cial in numerous reduced significantly or even avoided A further example of special applications special applications for the transport of completely depending on the jointing using MT multilayer pipes are cooling diverse media – e.g. for compressed air as technology. Thus, energy consumption ducts and networks. Deployment generally well as cooling ducts and internal gas in- and expenses for the supply of compressed features in-plant symmetrical or asymme- stallations. The broad range of possibilities air are reduced. Furthermore, the stable pi- trical insulation of PE foam. Furthermore, is virtually unlimited. Hewing experts pes even provide benefi ts in the assembly an outer PE layer applied to the insulation determine the most suitable layout of of comprehensive compressed air net- jacket provides effective protection MT multilayer pipes for each individual works. Delivery on coils enables easy against external moisture and mechanical deployment based on requirement profi les. installation featuring just a few attachment damage. The transported media are secu- System providers frequently even have points, also for longer distances. The rely protected against heat via the in- the opportunity to design their complete durability of MT multilayer pipes in stallation of these pre-insulated solutions. systems multi-functionally for diverse compressed air applications up to 16 bar is Several benefi ts are also demonstrated applications, thus generating additional ensured by their resistance, e.g. against oil during installation. Thus, the complex benefi ts for their clients. contaminated compressed air as well application of insulation prior to installation as corrosive external media and exhaust is no longer required. In addition, there Economical transport of fumes from machines. are no critical gaps between adjoined compressed air jackets reducing heat insulation thanks Thanks to their expandability and smooth to the continuous insulation when coils surfaces, MT multilayer pipes are out- are laid – even in diffi cult-to-access in- standing in the minimisation of pressure stallation areas.

12 MT GAS multilayer pipes are leak-impermeable The pipes are to be integrated in complete Installation of gas pipes is more rapid with MT against odorizers and methane thanks to their internal gas installation systems, which meet GAS vis-à-vis alternative pipe materials – not aluminium layer. the laying regulations of the relevant countries least as pipe bends can be implemented without and supply companies. further ﬁ ttings.

Internal gas installations installation facilities and extensions in new System providers can also benefi t from or existing buildings must be fi tted with the advantages of multilayer pipes in preventive measures. Pipe-laying regulati- internal gas installations with MT GAS ons for non-metal internal gas installations from Hewing. The pioneering multilayer in the respective countries – in Germany pipe, which is certified according to the TRGI (Technical Guidelines for Gas In- German (dimensions 16 mm and 20 mm) as stallations) – and of supply companies well as Dutch (dimensions 16 mm, 20 mm, must be observed. 26 mm, 32 mm and 40 mm) standards now also enables the benefits of PE-Xc and Further information on MT GAS multilayer aluminium material combinations to be pipes can be obtained from the relevant used in this application area. In particular, Hewing GmbH product data sheet. the installation benefits responsible for the success of MT multilayer pipes in tap water installations and radiator connections are signifi cant.

Thus, MT GAS enables rapid and secure installation as pipe bends can be manufactured quickly without any additional ﬁ ttings. Furthermore, the pipe is absolutely leak-impermeable against odorizers as well as methane, and ensures minimal pressure loss in the transport of gas thanks to its smooth surfaces.

Deployment in complete systems The MT GAS multilayer pipes are to be integrated in complete systems for internal gas installation. In Germany, these must feature variants of flow control devices in the home to prevent manipulati- on. Today, these must be used at all times independent of the pipe material deployed regardless whether metal internal gas installations or other approved materials are concerned. In principle, all new gas

13 Tips for users Ensuring a sustainable installation.

1. 2. 3. 4. 5. 6.

1. UV protection radiator / tap which axially channel pipe 5. Open f ame / heating MT multilayer pipes should be protected loads onto connection points. All sources of heat which can heat MT from direct, intense sunlight during (also see relevant chapter in Hewing’s multilayer pipes in excess of 110° C must storage and installation. UV radiation can- Technical Manual) be kept at a distance. This also applies to not attack the entire pipe, but rather the open ﬂ ames – these are not required for external plastic coating in the case of 3. Uncoiling facilities bending or jointing technology. long-term exposure. Stationary uncoiling facilities should be located as close as possible to the in- 6. Cutting the protective pipe 2. Thermal expansion stallation area. This avoids feeding pipes Protective pipes should generally be cut Thermal expansion of MT multilayer around too many corners (e.g. door- to length with special protective pipe cut- pipes is minimal and corresponds approxi- ways) and minimises the distance the pipe ters. If such a tool is not available, normal mately to metal pipes. However, in princip- is pulled across the ground. Items with knives can also be used – however, the le, the following must be observed during sharp edges should be removed from the internal MT multilayer pipe should be pipe installation: Pipes must be granted area or covered. protected by a metallic cutting sleeve sufﬁ cient scope for potential expansion whilst cutting the corrugated pipe. to avoid a mechanical bending-strength 4. Pipe buckling and deformations overload of screwed joints. ”Pipe-in-pipe” Buckles and deformations should be installation featuring angular deflection avoided. If MT multilayer pipes are un- represents a potential solution. Further intentionally damaged in this way, the tools include pipe guide bends in the area sections concerned must be removed. of the manifold or junction boxes on the

14 7. 8. 9. 10.

11. 12. 13. 14.

7. Cutting the MT multilayer pipe consumption point. If the installation of a 14. Installation instructions MT multilayer pipes should only be cut fitting is unavoidable, e.g. whilst laying The installation instructions of the relevant to length using pipe cutters provided or remaining lengths of pipe, it may only be system provider must be observed. recommended by the system providers or positioned on a straight pipe, not in a bend. a fi ne-bladed saw. Cutting pliers for plas- 15. Utilisation opportunities tic pipes are not suitable as they generally 10. Manifold connection points in sanitation, heating and air deform the pipe ends of the multilayer Pipes must always be connected axially ali- conditioning pipes strongly, greatly hampering correct gned and securely fastened to the manifold. In Germany, the product residue, packag- fi tting assembly. Installation must occur under as little stress ing material and worn-out products which as possible, i.e. without notching, bending, accumulate on users’ premises can be A clean, burr-free execution of the cut tensile and torsional stress. effi ciently recycled using the Interseroh perpendicular to the pipe axis is important Recycling System. An Interseroh directory – a significant requirement for perma- 11. Pressure test provides information regarding the locati- nently leak tight connections. Potential Following completion of installation MT mul- on of the nearest Interseroh waste dispo- splintering must be removed prior to tilayer pipes must undergo a pressure test sal partner. further processing. If a MT multilayer pipe according to the data of the relevant system is cut at the wrong point, this pipe section provider and /or technological standards. should be removed. 12. Solvents 8. Deburring and calibrating Direct contact of MT multilayer pipes In particular with regard to fi ttings fea- with solvents or paints, sprays, pens, tapes turing O-rings, the internal edges of the end etc. containing solvents should be avoided of the pipe must be deburred (protection as these can damage the pipe surface. of the O-ring) and the end of the pipe must be calibrated. This also facilitates moun- 13. Antifreeze ting the pipe on the insert of the fi tting. Filled MT multilayer pipes must not be frozen as this can produce internal pres- 9. Fittings sure in excess of 120 bar. They should Due to the usually relatively short connec- therefore be emptied or otherwise protection length, pipe fi ttings are generally not ted from freezing should there be a risk of required between the manifold and the frost.

15 System providers from the sanitary and heating industry rely on Hewing as a strong OEM partner in the development and production of crosslinked polyethylene pipes and aluminium multilayer pipes. Hewing also offers and develops special solutions for different industrial applications and transport of liquid or solid matters.

Hewing GmbH Industriegebiet Ost 1

Waldstraße 3 Subject to technical amendments. Issue: 02/11 www.conceptdesign.info 48607 Ochtrup, Germany Phone: +49(0)2553 70-01 Fax: +49 (0)2553 70-17 www.hewing.com [email protected]

Certiﬁ ed in accordance with: DIN EN ISO 9001+14001