TPT September 2016

67 / 120

September 2016 65
T E CHNOLOG Y
PROVEN QUAL ITY
Made inGermany
Global Presence
Qualified Support
QualityService
QUALITY MEANS TO US:
PROVIDING
RELIABLE
SOLUTIONS
FOR QUALITY
ASSURANCE.
Our pioneering EDDYCHECK® 610 is a fully digital signal
processing eddy current system for the unerring quality
assurance of tubes, bars and wires with up to 10 chan-
nels at up to 6 test positions.
• Higher productivity due to higher throughput speeds
• Higher spatial resolution for fault marking and
reduction of false scrap
• Extensive test result documentation
• Ease of operation through touchscreen and
push-buttons
INNOVATION MADE IN GERMANY.
Visit us in Las Vegas
16-18 November 2016Hall 6
Booth
N6215
PRÜFTECHNIK NDT GmbH
Am Lenzenfleck 21
85737 Ismaning
Tel.: +49 8999616-0
Increasing the
productivity of a
tube and pipe mill
THE productivity of a tube and pipe mill is generally based
on two sets of data, according to Dalian Field based in
China: one set of data that looks at which kinds of products
can be produced by the mill and the other data set that
looks at how high a speed the mill can reach when dealing
with different sizes of tubes.
Both sets of data are important for producers who have
only a small number of mills. The second set of data is more
important for producers who have many mills of different
sizes. Taking an example of a Ø219mm/t x8.0mm pipe mill
with 500kw HF welder, when the line speed is at 24m/min,
wall thickness is decreased to 4mm and the line speed will be
up to 60m/min; but due to drag from the cutting-off machine
of the mill, the real speed can only be up to around 30m/min,
because high speed will result in the short life of the saw blade.
There are two methods to increase line speed: double length
cutting for off-line secondary cutting (which requires more
space, more labour cost and therefore very few producers
choose to do it this way); or double cart milling saw (FD
patented technology) – a flying saw with increased line speed
without a decrease to saw blade life. If line speed can be up
to 60m/min when producing Ø219mm/t4.0mm, the max speed
of this mill can be up to 120m/min (when producing size less
than Ø114mm/t2.5mm). Productivity on one set of this kind of
mill will be equal to that of two sets of normal mills.
In addition, it has already been proven that for producers
who have only a small number of mills, the size that can be
produced by the mills is very important. Taking the example
of a Ø219x8.0mm pipe mill, a standard size range is at Ø114-
219mm/t2-8.0mm; but if the minimum size can be at 76x1mm,
and there is a mill of Ø12-76/t0.8-4.0mm, then various pipe
sizes below Ø219x8.0mm can be produced with only these
two mills.
The above examples tells us the significance for productivity.
A good choice will not only decrease preliminary investment
costs, saving land and factory investment, but is also an
important economic and technical index that influences the
cost of production for a long time in the future, which is a major
determinant of competitiveness for pipe producers.
Dalian Field – China
Email:
Website: