Transcript IIW Doc. III-1396-06 S.I. Kuchuk

E.O. Paton Electric Welding
Institute, Kyiv, Ukraine
FLASH-BUTT WELDING FOR
COMPRESSED NATURAL GAS (SNG)
TRANSPORTATION AND STORAGE
Ihor Ziakhor, Ph. D.
The Coselle is a unique system, invented in Canada,
for Compressed Natural Gas (CNG)
transportation and storage in coil of small diameter pipe.
• A single Coselle carries about 3.0 million standard
cubic feet (mmscf) of natural gas.
• Numerous Coselles with CNG are contained within
the specially-designed ship.
Potential markets for CNG concept
What is CNG / LNG
Design and capacity of Coselle system
• Each coselle consists of
about 17,350 meters of
168 mm diameter pipe of
high strength X70 steel
• The size of a Coselle may
range from 15 to 20
meters in diameter and
2.5 to 4.5 meters in height,
and it may weigh about
550 tones.
Fully Framed Coselle
(20m exterior Diameter)
One of the main problems is to manufacture
coiled pipe structures using the most
appropriate technology
• The first problem is
reliable method of
single X70 steel pipes
connection (welding)
into long pipe section
• The second problem
is long pipe section
winding with minimal
ovalization
1 - to weld
2 - to wind
Innovative Aspect
E.O. Paton Welding Institute
proposed to Sea NG, Canada,
the inventor of Coselle technology,
to use Flash Butt Welding (FBW)
for pipe connection
• Experimental evaluation of FBW
applied to coiled pipe structures
manufacture has shown technical
advantages over standard welding
methods
What’s the problem
• Flash butt welding (FBW) is the process where
the parts to be welded are heated to required
temperature by passing of electric current and
pressed to each other to form a welded joint
• FBW is applied for welding steel pipes, rails,
and other rolled stocks, parts of light metal alloys,
e.g. aluminium-base and titanium-base alloys
However, FBW performed with the available
equipment is limited in capabilities due to the
level of technical characteristics of existing
welding machines, mainly electronic and
hydraulic control systems.
Development of a new generation of the FBW
technology and equipment to address the
following tasks:
• raising efficiency of the process through building
fast-response actuating mechanisms and
computerized system to control the welding process;
• raising productivity and ensuring a specified level of
mechanical properties of welded joints through
intensification of the thermal-deformation cycle of
welding;
• computerization of inspection and diagnostics of
quality of welded joints;
• improving environmental characteristics of the
process (substantial decrease in harmful emissions
into the atmosphere)
Stage of Development: The experimental
equipment prototype and several batches of
welded pipes are available.
Modernized K584M machine
during welding of pipes
for Coselle manufacture
Welded pipe specimen after bending
Main Advantages of Flash-Butt Welding (FBW)
applied to manufacturing coselles.
• to strengthen
mechanical properties of
welded joints, in
particular cyclic weld
strength,
• to increase productivity
of winding pipes,
• to enhance safety and
reliability of Coselle
carries
Ì àêñèì àëüí û å í àï ðÿæåí èÿ - Ì Ï à
• This solution will allow
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Êî ëè÷åñòâî öèêëî â, N
Plots of fatigue resistance of welded
joints in X70 (1) and X56 (2) pipes
Ðèñ 2. Ñî ï ðî òèâëåí èå óñòàëî ñòè ñòû êî âû õ ñî åäèí åí èé ñòàëåé Ñò.20 -2 (1) è
Õ70 (2), âû ï î ëí åí í û õ ýëåêòðî êî í òàêòí î é ñâàðêî é ñî ñí ÿòèåì ãðàòà, ï ðè
ãàðì î í è÷åñêî ì î ñåâî ì ðàñòÿæåí èè ñ êî ýô ô èöèåí òî ì àñèì ì åòðèè öèêëà r = 0,1.
Contact Details
• Dr. Valerij Kryvenko
Phone: (380 044 ) 524-7304;
• Fax: (380 044 ) 227-6329; 271-2328
• E-mail: [email protected],
[email protected]
• E.O. Paton Electric Welding Institute, Kyiv
• Address: 03680, Ukraine, Kyiv, 11, Bozhenko str.