Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.


Benefits of multilayer pipe systems with an evaltm evoh barrier layer

 

Mieke Vanhoof, Cynthia Teniers

Papers # 2016 Berlin

Since many years EVOH (ethylene/vinyl alcohol copolymer) is applied in plastic heating systems [cross-linked polyethylene (PEX), polyethylene of raised temperature resistance (PE-RT), polypropylene (PP), polybutylene (PB)], where its excellent gas barrier properties ensure a minimization of corrosion of the metal parts in the heating system. Such multilayer pipe structure are also commonly used for domestic gas supply systems. There are however several other pipe applications where the incorporation of an EVOH barrier layer by coextrusion is beneficial: fuel transport systems, drinking water systems for contaminated soil and pre-insulated pipe systems. In these applications, in addition to gas barrier, the fuel vapour barrier and chemical resistance of EVOH are of particular interest.

Since many years EVOH is applied in plastic heating systems (PEX, PE-RT, PP, PB), where its excellent gas barrier properties ensure a minimization of corrosion of metal parts in the heating element. Such multilayer pipe systems with an EVOH barrier layer are also commonly used for domestic gas supply systems.

There are however several other pipe applications where the incorporation of an EVOH barrier layer by coextrusion is beneficial: fuel transport systems, drinking water systems for contaminated soil and pre-insulated pipe systems.

Areas around fuel stations have an increased risk for hydrocarbon contamination of the soil and the ground water. By adding an EVOH barrier layer to the fuel transport pipe systems, the level of environmental protection can be increased, avoiding expensive future remediation costs.

Especially in areas with a high population density, there is increasing pressure to reuse former industrial land that may be contaminated. As such “brownfield” sites are redeveloped, it is necessary to ensure the quality and safety of drinking water supplies that may be laid through them.

Drinking water pipes with an EVOH barrier offer a reliable, full plastic solution that can substantially decrease the migration of hydrocarbons, volatile organic compounds (VOCs) and organic solvents from contaminated sites.

Pre-insulated pipe systems, insulated with rigid polyurethane (PUR) foam, are used for district energy networks as well as other industrial applications such as oil & gas networks. Studies have shown that the service life of these pre-insulated pipe systems can be shortened by oxidative degradation of the PUR foam which can endanger the structural integrity of the pipe system. In addition, the insulation efficiency of these pre-insulated pipe systems reduces over time as outside air diffuses into the foam cells, leading to higher energy loss. Pre-insulated pipes with an EVOH barrier in their casing pipe are not prone to oxidative degradation, and retain their insulation efficiency throughout their lifetime, significantly reducing the operating costs of the overall network. 

Related keywords : barrier, pipe, EVOH, multilayer, coextrusion.
Please note that the whole article content is available on PPCA website only


Related papers

2021 Amsterdam : A NEW GENERATION OF HIGH PERFORMANCE BIAXIALLY ORIENTED POLYETHYLENE AND POLYPROPYLENE PRESSURE PIPES

Author(s) : A. Taraiya, P. Degenhart, M. Soliman, M. Boerakker, R. Handstanger, R. Kleppinger

Since the introduction of polyolefins for pressure pipes, continuous improvements have been made to meet ever-higher demands on their performance and to expand their application window beyond their original scope, mostly based on new resin formulations. Today, we also continue to push the limit to provide better...

2021 Amsterdam : A TRADE ASSOCIATION EXPLORED

Author(s) : Drew Mueller, Peter Dyke

HDPE Pipe holds a dominant position in several markets in North America: natural gas distribution, oil patch, mining, landfill and geothermal. So why are polyethylene’s municipal water and wastewater market shares so much lower than these other industries? How has the polyethylene industry been successful in growing...

2021 Amsterdam : AN EVIDENTIAL APPROACH TO USE OF POLYETHYLENE PIPE FOR HYDROGEN FUEL GASES

Author(s) : Derek Muckle

A technical program has been undertaken to provide evidence on the suitability of polyethylene pipe and fitting systems for the distribution of hydrogen fuel gas. The underlying principle has been to evaluate material in the form of a pipe and to consider the performance of the pipe and of the welded jointing systems...

2021 Amsterdam : APPLICATION OF PP-R COMPOSITE REINFORCED PIPES IN HOT AND COLD WATER SYSTEMS

Author(s) : Lei Wang, Guozhi Xu, Qiaoping Qiu, Weihua Lu, Yanwang Han

PP-R (random copolymerized polypropylene) has been widely used in hot and cold water systems. However, the standard PP-R pipes have the disadvantages of a large high-temperature thermal expansion coefficient, an insufficient notched impact strength, and a low temperature and pressure resistance. In this paper, a new...

2021 Amsterdam : CHALLENGING THE 10% WALL THICKNESS RULE FOR HDPE MARINE PIPELINES

Author(s) : Ilija Radeljic, Ebbe Smith

HDPE pipe can be relatively easily scratched during the manipulation on the site, which is especially true for the marine pipelines. Installing the scratched marine pipe with the S bend method presents a risk and repair methods are usually performed. Currently, there is no standard defining the repair procedure, in...

2021 Amsterdam : EFFECT OF CHLORINATED WATER ON THE FATIGUE CRACK GROWTH RESISTANCE OF POLYETHYLENE COMPOUNDS WITH RECYCLATE CONTENT FOR PIPE APPLICATIONS

Author(s) : Paul J. Freudenthaler, Joerg Fischer, Mathias Eder, Reinhold W. Lang

For controlled water disinfection, typically chlorine is used and preliminary studies demonstrate its aging and crack growth acceleration effects on polyolefin pipe materials [1, 2]. Although the use of recycled plastics is not prohibited in some ISO standards for polyolefin piping systems [3–5], only small amounts...

2021 Amsterdam : EXPERIMENTAL DETERMINATION OF THE EFFECTS OF LIQUID HYDROCARBONS ON THE LONG-TERM CREEP RUPTURE PROPERTIES OF PRESSURE PIPE GRADE UNPLASTICIZED POLYAMIDE-12

Author(s) : James F. Mason, Akshay Ponda, Hermann van Laak, Buc Slay

The effects of liquid hydrocarbons on long term strength of pipe grade thermoplastic resins is an important consideration when designing pressure pipe for use in the oil and gas industry. There is an extensive body of work going back several decades descri bing these effects for pipe grade polyethylenes, and all...

2021 Amsterdam : FINDING THE RIGHT PIPE TEST FOR POLYETHYLENE WITH RAISED RESISTANCE TO SLOW CRACK GROWTH

Author(s) : Ernst van der Stok

For PE 100-RC, two tests are still under development for pipes: the point load test (PLT) and the accelerated notch pipe test (aNPT). The PLT was developed by a project group consisting of manufacturers and end users. The PLT determines the resistance to point loads as they can occur in practice. An earlier study...

2021 Amsterdam : FINITE ELEMENT METHOD (FEM) USED TO SIMULATE THE STRESS/STRAIN OF THE POINT LOAD TEST (PLT) IN A BROADER STUDY TO SUPPORT THE FUTURE ISO TEST STANDARD

Author(s) : S. Nestelberger, J. Cheng

The Point Load Test (PLT) [‎ 1, ‎ 2] was designed to simulate the SCG (slow crack growth) failure initiated by a rock pressing into the exterior wall of a polymer pipe. Today’s PE materials sustain long PLT testing times, due to its high SCG resistance design. Consequently, an accelerated “PLT+” with the support of...

2021 Amsterdam : FLOWABLE FILL FOR PLASTIC PIPE

Author(s) : Amster Howard

Flowable fill is used for many applications, but mainly for pipe trench embedment and backfill. There are three ways that using flowable fill can be kind to the environment. Because flowable fill is self-leveling and has a strength greater than the native soil, the trench cross section can be minimized. This means...

2021 Amsterdam : FROM MULTILAYER LAMINATES TO INDUSTRIAL PIPE APPLICATIONS – A GUIDELINE

Author(s) : Gerald Pinter, Johannes Wiener, Florian Arbeiter, Abhishek Tiwari, Otmar Kolednik

For pipe applications, catastrophic failure due to crack growth has to be prevented by all means. Techniques to develop new and even tougher pipe materials are explored in this contribution. The aim is to create a multi-layer architecture, that exhibits high toughness as well as damage tolerance towards sharp notches....

2021 Amsterdam : INNOVATIVE MILLIMETER WAVE TECHNOLOGY FOR MEASURING THE PIPE WALL THICKNESS EARLY IN THE EXTRUSION PROCESS

Author(s) : Christian Schalich

Plastic pipes for infrastructure and building applications are precisely specified with regards to wall thickness and diameter. Pipe manufacturers use different measuring methods in order to ensure the required dimensional accuracy and maintain a constant high quality. This paper introduces a measuring system based on...

2021 Amsterdam : MECHANICAL INTERGRITY OF HDPE BUTT FUSION JOINTS – EFFECT OF CARBON BLACK DISTRIBUTION

Author(s) : Suleyman Deveci, Nisha Preschilla, Sulistiyanto Nugroho, Birkan Eryigit

Carbon black (CB) has been used as a perfect and the cheapest solution to prevent photo degradation of polyethylene against UV light exposure. The effect of carbon black on the mechanical properties of polyethylene pipes was studied extensively, but only on well dispersed and distributed carbon black...

2021 Amsterdam : MOBILE EXTRUSION TECHNOLOGY - A CASE STUDY USING INNOVATIVE MEANS OF ASSURING HDPE PIPE SUPPLY (IN BOTH THE PERMIAN BASIN OF WEST TEXAS AND THE MINING REGION OF CENTRAL FLORIDA)

Author(s) : White G. Jee, Wes Long, Marcello Russo

In 2018, the North American HDPE pressure pipe market experienced unprecedented demand and growth especially in the region of the Permian basin in west Texas. 1 As aninnovative means of increasing HDPE pipe supply in this region, the first modular mobile extrusion plant was moved to Pecos, TX. Using custom designed...

2021 Amsterdam : MULTILAYER POLYMER PIPES – THE INFLUENCE OF RESIDUAL STRESS ON FATIGUE LIFETIME

Author(s) : Lukas Travnicek, Pavel Hutar, Jan Poduska, Andreas Frank, Florian Arbeiter, Jaroslav Kucera, Jiri Sadilek, Gerald Pinter, Lubos Nahlik

The application of recycled material in pressure piping systems has been considered lately – it was suggested, that the recycled polyethylene could be used as a part of a multilayer pipe together with virgin material. This type of pressure pipes is not availableon the market yet, so their properties can be only...

2021 Amsterdam : MUTUAL RECOGNITION OF THE CERTIFICAT ION SCHEMES IN EUROPE

Author(s) : Horst Stimmelmayr, Peter Sejersen

The voluntary certification scheme for plastic multilayer piping systems for hot and cold drinking water inside buildings is a joint effort of two key European organizations. It was initiated in close cooperation with the Brussels based European trade association of plastic pipe and fittings manufacturers, TEPPFA....

2021 Amsterdam : NEW CROSSLINKED POLYETHYLENE PIPES WITH HIGH THERMAL STABILITY AND LOW PERMEATION FOR PETROLEUM ENGINEERING

Author(s) : Gisbert Rieß, Katrin Berger, Anna Kaltenegger-Uray, Florian Arbeiter

The effect of electron-beam and silane crosslink of polyethylene on the resulting permeation characteristics was investigated. Polyethylene sheets were processed and crosslinked by irradiation with high energy electrons and by grafting and subsequent hydrolysis of organosilanes during a reactive extrusion process. The...

2021 Amsterdam : PIPE FOR FIRE EXTINGISHING DEVICE

Author(s) : Yoshikatsu NISHIDA, Yukihisa YAMADA, Masaya IWASAKI, Masaru TOMOBE, Yuichi KOUGA

By using polyethylene as the main material for this fire extinguishing device pipe, a resin-made fire extinguishing device is developed that is maintenance-free for eight years and can cope with the abnormal heat generation of lithium ion batteries. In order to prevent the internal extinguishant from permeating and...

2021 Amsterdam : POLYETHYLENE OF RAISED TEMPERATURE (PE-RT) IN LOW TEMPERATURE DISTRICT HEATING SYSTEMS

Author(s) : Alex Stolarz, Klaus Grønnegaard Lauridsen

Low temperature District Heating – COOL DH – addresses the challenges of the upcoming decades in the energy sector for new housing developments. Energy efficiency is an important aspect of modern building construction. Improved building insulation and other technologies result in lower heat demand and enable new...

2021 Amsterdam : PRESSURE PIPELINE MADE OF HDPE – DETERMINATION OF REMAINING LIFETIME AFTER 47 YEARS OF OPERATION IN LAKE OSSIACH (CARINTHIA, AUSTRIA)

Author(s) : Ulrich Schulte, Dr. -Ing. Joachim Hessel

In order to protect the Austrian lakes effectively against the discharge of effluent, a 13 km long pressure pipeline made of high density polyethylene was laid on the bottom of Lake Ossiach back in 1971. The DN355 to DN200 pipes were produced from a first generation HDPE-compound. The classification would have been...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationINEOS O&PIRPCKazanorgsintez PJSCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE
Webinar : Benefits of PE100+ Material and their use in Trenchless TechnologyWebinar : Benefits of PE100+ Material and their use in Trenchless Technology

On march 10th, was held the PE 100+ ASSOCIATION first webinar. The webinar was a great success and attracted a large audience. 

TOP