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POLYETHYLENE USED IN INDUSTRIAL APPLICATIONS AT ELEVATED TEMPERATURES

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POLYETHYLENE USED IN INDUSTRIAL
APPLICATIONS AT ELEVATED
TEMPERATURES
Dr. Holger Bruening Detlef Schramm
Basell Polyolefine GmbH Basell Sales & Marketing B.V.
Introduction
First PE-RT resins targeted typical interior pipe applications like plumbing or
underfloor heating (UFH) in competition to PEX/PB-1/PP-R
PE-RT allows to produce PE pressure pipe used at temperatures > 40°C without
the need for crosslining
PE-RT key properties: Temperature/pressure resistance according to ISO24033 as
well as flexibility (UFH) and chlorine resistance (plumbing)
PE-RT offers a possibility for industrial piping applications to enlarge the range of
application temperatures compared to PE100 resins while keeping all good
properties of PE100
Resins used in industrial piping have different key properties:
- Larger pipe diameters -> sagging effect
- Weldability -> butt welding
- UV resistance -> longer storage outside at the construction work
One Target Different Molecular Designs
Ethylen-Hexen Copolymer
Ethylen-Buten Copolymer
Ethylen-Octen Copolymer
Molecular weight distribution of different PE-RT Type II resins PE resins with
- different comonomer
- different MolecularWeightDistribution
- different density
fullfill PE-RT Type II
requirements (ISO24033)
-> focus on pressure resistance
Influence on other
properties ???
Large Diameter Waste Water Pipe for
Raised Temperature Application
Photos courtesy of: Chevron Munaigas Inc. Atyrau, Kazakhstan, http://atyraupipe.kz
Diameter: 500 mm SDR: 7,4
Application: Waste water, Temperature 60°C
Large pipes with low SDR: Sagging during pipe extrusion can be an issue
Sagging: PE100 / PE-RT
PE100 Optimized for Low Sagging Hostalen ACP process
PE100 Standard Hostalen ACP process
PE-RT Type II Hostalen ACP process
PE-RT Type II Bimodal Hybrid Catalyst Based
„XL-Pipe“
Sagging an important effect
for PE-RT resins used
in industrial applications !
Butt Welding: Important for Industrial Applications
Butt welded pipe (110x10mm)
based on the same PE-RT base resin
Butt welded pipe (110x10mm)
based on different PE-RT base resins
2015 PE-RT resins became part of ISO 15494 for plastic piping systems in industrial applications
(range for PE-RT MFR values specified)
Different approaches in molecular design creating resins fullfilling the PE-RT standards lead
to resins having very different viscosity / MFR values
PE100 resins are much more comparable regarding such parameters due to the fact that
application standards set more tight specifications since years
Welding of pipes made from resins having larger differences
in MFR values can be more difficult Starting points for
stress cracks
UV Protection of Industrial Pipes for Raised
Temperature Applications
Typically PE-RT resins have natural color and no UV stabilization
Carbon black serves as a very good UV stabilizer but the distribution of
carbon black needs to fullfill certain quality criteria
Microtome cut of a pipe (32x3mm)
based fully compounded black resin
Microtome cut of pipe (40x4mm) based on a
natural PE-RT colored in black by adding a
masterbatch in the pipe extruder
Hot Water Applications
Biogas Heat
Storage
district
heating
network
Biogas
Photos courtesy of AGRU, www.agru.at
Artificial lagoon
Temperature at entry from
power station: 80 °C
Temperature at outlet to lake: 25 °C
Geothermal power station,
Lake Taupo, New Zealand
Inliner in heat storage tank (55°C 95°C) as
a part of a combined biogas unit, power
generator and district heating network for
~150 buildings in Emmingen, Germany
Cable Conduit Pipes for Underground Power Lines
Photo courtesy of dpa
Source: „NEP 2025, Stand: Februar 2016,
www.netzentwicklungsplan.de
Underground cabling planned for most of the new
High Voltage Direct Current (HVDC) power lines
Spending of additional 3 to 8 Billion EUR to
reduce local protests, to protect reservations
and speed up planning and construction
90 °C in the copper conductor caused by ohmic
losses will lead to 40° C to 70 °C in the conduit pipe
Germany
Cable Conduit Pipes for Underground Power Lines
Cable conduit pipe for power cables at a construction side Temperature distribution in a power cable
Photos courtesy of Gerodur MPM Kunststoffverarbeitung GmbH & Co. KG, www.gerodur.de
PE-RT resins are already used in conduit pipes to avoid early collapsing of the pipes due to heat aging
Diameters of HVDC cable conduit pipes up to DA 560 mm and SDR ratios of typically 17 or 11
require a proper choice of the PE-RT resin taking into account the viscosity properties discussed earlier
Conclusions
PE-RT pipes are a very good choice for industrial applications
Various examples
- heat storage and transportation in energy systems
- waste water pipes in oil fields
- conduit pipes in HV power lines
point out that the advantageous properties of PE in piping systems at lower
temperatures can be transferred to applications with raised temperature
Most PE-RT resins are developed with a main focus on pressure resistance at
raised temperatures and long term heat aging resistance
Further parameters connected to the molecular design of the PE-RT resin
like viscosity or density have to be taken into account while choosing
a resin for a specific industrial application
Disclaimer and Trademarks
Hostalen is a trademark owned or used by the LyondellBasell group of companies and it is registered with
the US Patent and Trademark Office.
Before using a product sold by one of the LyondellBasell family of companies, users should make their own
independent determination that the product is suitable for the intended use and can be used safely and
legally.
LyondellBasell disclaims all warranties, including, but not limited to, the implied warranties of
merchantability and fitness for a particular purpose, that might arise in connection with this information.
These products may not be used in the manufacture of any US FDA Class III Medical Device or Health
Canada Class IV Medical Device and may not be used in the manufacture of any US FDA Class II Medical
Device or Health Canada Class II or Class III Medical Device without the prior written approval by Seller of
each specific product or application.
All technical assistance and advice is furnished by LyondellBasell without compensation. LyondellBasell
assumes no obligation or liability with respect to such advice and assistance and disclaims any and all
warranties with respect to such advice and assistance.
Users should review the applicable Material Safety Data Sheet before handling the product.
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