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Pipes and couplings manufacturing line

DANOBAT has opened a new pipes

and couplings manufacturing line for the

company Tubos Reunidos.

The new facility is equipped with

Danobat machines for the manufacture

of threaded pipes and hoses. The project

is the result of a joint venture between

Tubos Reunidos and Marubeni. The

premises total around 31,500m


, and

include a workshop where the Danobat

machines manufacture the threaded


The new production line will




pipes, specifically threaded for drilling

and production of oil and gas wells.

Danobat machines finish off the pipes

with patented premium threads that are

claimed to provide superior performance.

“They are perfectly suited for work on

sites at 4,000 or 5,000 metres depth,”

explained Carlos San Martín, director of

technology and development of Tubos

Reunidos Industrial.

Among other facilities, the line will

have several horizontal Danobat TTB

lathes for the machining of pipes. One

of the most important features of this

machine is the rigidity, high production

and chip removal capacities during

turning and threading operations. In

addition, it is provided with load-unload

systems, positioning channels and

solutions with specific tools for turning


The line will be equipped with Danobat

band saws to cut the pipes, offering

a high value-added comprehensive

solution to Tubos Reunidos.

In the new factory, Danobat machinery

will also produce the necessary special

couplings to join the pipes in the well.


– Spain


Nakata 30" ODF Mill line

NAKATA Mfg Co, Japan, is preparing

to deliver its first orbital die forming mill

for large welded pipes to a Chinese

pipe manufacturer following the recent

installation of a small pipe mill of the

same type equipped with a laser welder

at a Japanese customer.

The pipe size is up to OD 30"

(762mm) and WT 25.4mm, and most

of the products are API line pipes up to

X80 grade. The metal strip used in roll-

forming is typically coiled with a width

of less than 2m. This means the roll-

forming process is only applied to the

production of pipes below 26" OD and

beyond that press forming processes

such as UO and JCO have to be used.

Theoretically, it is possible to produce

pipes larger than 26" OD using the roll-

forming process if plates can be used as

raw material instead of coil. In practice,

however, it is difficult for roll-forming to

process the plate stably because of its

limited length.

In addition, irregularly deformed

pipes, at both the nose and tail ends, are

caused by strong contact between the

plate and rolls during threading, resulting

in very low material yield compared to

the continuous process, which is a big

obstacle to the application of roll-forming

in the plate-by-plate process.

However, in this 30" ODF mill, these

problems can be solved by adopting

ODF technology to both the breakdown

and finpass section, resulting in a very

stable and productive hybrid forming


This innovative technology also has

other advantages in the production of

ultra-thin wall pipes and pipes made

of hard-to-work material, as well as

excellent performance in high-speed

laser welding.

Nakata Ltd

– Japan



Stainless steel tube making technology

KUSAKABE Electric and Machinery Co is

celebrating its 100


anniversary this year.

Its first complete stainless steel tube mill

installed in China was in Suzhou City, in

2010. This is a high frequency induction

welding stainless steel tube mill.

Many HF SUS tube mills have been

supplied around the world over the

past 20 years. The product range of the

Suzhou City tube mill is Ø32 to 65mm,

thickness 0.8 to 2.5mm, maximum line

speed 60m/min, and cutting length 4,000

to 6,000mm. The largest consumer of

HF welded SUS tubing is the automotive

exhaust industry.

The major advantages of this tube mill

are production yield and output. The yield

of prime products has been more than 97

per cent since production commenced

and the customer is delighted with this

result and the continuing level of technical

support, according to Kusakabe.

Kusakabe equipment is built for

durability, repeatability and reliability.

Output from the Suzhou City tube

mill is 1,500 to 1,800 tons per month.

Kusakabe designed and manufactured

the tube mill using its experience to take

full advantage of automation tomaximise

operator and machine productivity while

producing a consistent, high quality

product with minimum variation of all

the inputs. The tube mill contains many

of Kusakabe’s technologies, such as

strip forming for SUS, weld temperature

monitoring and control, internal weld

bead height adjustment while running,

quick change tooling for rapid OD

changes, data logging system of all

the variable inputs for engineering and

quality checking, tracking and auto

rejection of all defect tubing.

A new tube mill is to be delivered and

installed in the USA. The size range of

this tube mill is Ø45 to Ø54mm, thickness

1 to 1.5mm, line speed 15m/min and cut

length 700 to 2,200mm. After cutting, the

products do not need to be re-cut and

they go straight to the next process.

Kusakabe Electric and Machinery Co,


– Japan