TPi May 2015

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36 Tube Products International May 2015
products & developments
Re-lining project provides
clean water for 150,000
Providing large cities with drinking water
is not an easy task. Out-dated systems
can cause problems such as leakages
or contaminations. To secure a reliable,
economical and sustainable water
supply for the future, the Waterworks
Lublin (Poland) decided to renew part
of its old steel piping system. The new
polyethylene piping system from GF
Piping Systems now serves nearly half
of the 350,000 inhabitants.
Molewski Sp zoo realised the project
from May to November 2014 for the
Waterworks Lublin. Established since
1978, the experienced construction
company is specialised in building and
environmental engineering such as road
building and trenchless technology. The
transport line leads right through the
city centre, so the project required the
re-lining method, to be as space saving
as possible and due to the limited
number of branch connections in the
city.
GF Piping Systems was selected as
provider for the jointing technology. In
this application, plastics are resistant
to corrosion and abrasion. When
professionally installed, a 100-year
service life can be expected. The low
weight of plastic pipes is of benefit in the
areas of transportation and processing.
Energy costs can be reduced with
targeted layout planning and optimal
sizing contributing to a steady flow
rate.
Plastic solutions also have a
considerably smaller carbon footprint
than traditional materials – an important
factor in designing sustainable and
future-orientated piping systems.
The installation company used GF
Piping Systems electro-fusion couplers
for water and gas applications. These
ensure a quick and reliable connection
of pipes and spigot fittings with active
reinforcement.
The functioning of the coupler has its
origin in the manufacturing technology.
The outer pipe section is pressed over
the inner pipe section.
During the fusion process, the active
reinforcement takes effect: the heat in
the fusion zone reduces the stiffness
of the inner ring and the reinforcement
ring pushes actively from the outside
to the inner ring. Larger gaps can be
closed more quickly and expansion of
the coupler is inhibited.
During the cooling process the constant
pressure from the outside makes the
coupler shrink onto the pipe.
The extra-large inner diameter of the
coupler permits easy assembly, and
accommodates the pipe ovality often
found in practice. The exclusive use of
PE material ensures safe connection
even at low temperatures. No special
welding machine is required – all current
GF welding machines are suitable.
GF Piping Systems Ltd – Switzerland
ELGEF coupler and MSA 2.1
welding machine
Installation of ELGEF couplers
Steel pipe and fittings
Hebei Xingfeng Steel Pipe Co is a
manufacturer of steel pipe and fittings.
The company holds stock of seamless
steel pipes according to standards
such as DN150-DN350, Sch40, Sch80
and ASTM A106/A53/API 5L Gr B. The
maximum pipe length is 13m.
The company can also supply
hot-dipped galvanised and non-
galvanised pipe; seamless steel
pipes (12 to 610mm); ERW welded
steel pipe from 21.3 to 219.1mm
(½" to 8"); HFW (LSAW) welded
steel pipe from 219.1 to 1,420mm
(8" to 56"); square and rectangular
hollow sections (15 x 15mm to 300 x
300mm); and steel flanges and pipe
fittings.
Hebei Xingfeng Steel Pipe Co, Ltd
– China