On the Collapse Pressure of Impanded Large Diameter Pipe (JCO-C)

2012 ◽  
Author(s):  
Thilo Reichel ◽  
Vitaliy Pavlyk ◽  
Jochem Beissel ◽  
Ivan Aretov ◽  
Stelios Kyriakides
Keyword(s):  
Heat Treatment ◽  
Large Diameter ◽  
Full Scale ◽  
Compressive Yield Strength ◽  
Perfect Agreement ◽  
Collapse Pressure ◽  
Large Diameter Pipe ◽  
Diameter Pipe ◽  
Improved Performance ◽  
Welded Pipe

Current manufacturing technology for large diameter pipe, such as the UOE process, is known to result in pipe with reduced collapse pressure compared to a seamless one of the same steel grade and D/t. It has recently been demonstrated [1,2] that such deficient performance can be alleviated by finishing longitudinally welded pipe by compression. A newly developed cold sizing press, called Impander®, is used to produce pipe with reduced ovality, reduced residual stresses and increased compressive yield strength. The combination of these factors can lead to a significant increase in the collapse pressure of the pipe. The paper will review experimental and analytical results that demonstrate the improved collapse pressure of pipes manufactured by it. This improved performance was confirmed in a full-scale collapse experiment on a pipe finished by impansion of 1.1%. The test showed perfect agreement with the modelling. The collapse pressure was 37% higher than current design codes allow. Additional work has been performed aimed at evaluating the effect of low temperature heat treatment on the collapse pressure. A full-scale collapse test on impanded and heat-treated pipe has shown that a significant additional enhancement in collapse pressure results from the heat treatment. The paper will discuss the thermomechanical causes of these enhancements of the collapse pressure.

Improved Collapse Resistance of Large Diameter Pipe for Deepwater Applications Using a New Impander Technology

2010 ◽  
Author(s):  
Thilo Reichel ◽  
Vitaliy Pavlyk ◽  
Jochem Beissel ◽  
Stelios Kyriakides ◽  
Wen-Yea Jang
Keyword(s):  
Yield Strength ◽  
New Technology ◽  
Large Diameter ◽  
Compressive Yield Strength ◽  
Cold Forming ◽  
Collapse Pressure ◽  
Large Diameter Pipe ◽  
Diameter Pipe ◽  
Improved Performance ◽  
Welded Pipe

Large diameter pipe is most commonly produced by the UOE and JCO processes. In both cases the pipe is finished by cold expansion, which is known to be the main contributor to the reduced collapse pressure of such pipe compared to seamless pipe of the same steel grade and diameter-to-thickness ratio. The main cause of this degradation in collapse pressure is a reduction in the compressive yield strength of the material that results from the cold forming steps involved, particularly the expansion. This paper presents a new manufacturing technology in which longitudinally welded pipe is finished by controlled compression. A newly developed cold sizing press, called Impander, is used to produce pipe that is rounder, has reduced residual stresses, and increased compressive yield strength. The combination of these factors can lead to a significant increase in the collapse pressure of the pipe. The new technology is first introduced followed by experimental and analytical results that demonstrate the improved collapse pressure of pipes manufactured by it. The enhancement in collapse pressure will be demonstrated using X-65 grade, 20-inch pipe with one-inch wall. Pipes are compressed to different degrees, and their dimensional characteristics and compressive mechanical properties are measured. The measurements are used in finite element models to calculate the collapse pressure demonstrating the improved performance. The advantages of the process will also be confirmed using results from full-scale collapse experiments on 20-inch pipe manufactured by the new process.

Stress Development Inside Large Diameter Pipe Piles Using a Soil Plug Forcing System

2012 ◽  
Author(s):  
Jan Fischer ◽  
Sascha Henke ◽  
Sebastian Höhmann
Keyword(s):  
Bearing Capacity ◽  
Large Diameter ◽  
Significant Rise ◽  
Full Scale ◽  
Analysis Program ◽  
Soil Plug ◽  
Stress Development ◽  
Large Diameter Pipe ◽  
Diameter Pipe ◽  
Steel Piles

It is well known that soil plugging inside tubular steel piles will only appear in rather small diameter piles during impact driving. Therefore, large open ended steel piles, which are often used for the fixation of offshore buildings, such as wind farms, are highly unlikely to develop an internal soil plug. To take advantage of a soil plug, where a significant rise in the piles’ bearing capacity generally appears, a large diameter pipe-pile with an inner steel ring was designed by the third author. The location of the steel ring was determined by the soil formation in situ. To avoid increasing pile driving energy, the internal ring should dip into dense soil conditions only for the last few decimeters of driving. In October 2010, a full scale test was performed in the harbor of Hamburg, using two tubular piles with an outer diameter of 1220 mm. One pile was equipped with an inner steel ring as described above. The second pile was a typical tubular pile without any attached systems. To better compare the results, both piles were driven next to each other. Both piles were equipped with internal total stress and pore water pressure sensors at the pile tip to investigate the radial stress development during and after installation. Acceleration and strain at the pile head were measured to predict the bearing capacity. Using the numerical analysis program CAPWAP (Case Pile Wave Analysis Program) [15], the distribution of shaft and toe friction can be determined additionally. Furthermore, the internal soil movement was surveyed during driving. The results of the measurements showed, that when using an inner steel ring, a significant rise in internal radial stresses and the piles’ bearing capacity occurs. To better understand the stress development inside and outside the two investigated piles during driving, a numerical back-calculation of the recorded measurements was performed. The results of the full scale and numerical simulations, with a particular focus on the use of an internal steel ring to force the soil to plug behavior in large diameter pipe piles, is presented in the following paper.

Large Diameter Pipe Design under Urban Constraints

2003 ◽  
Author(s):  
Jennifer McNutt ◽  
Mike Middleton ◽  
Dave Bennett ◽  
Bruce Corwin ◽  
Brett Grant
Keyword(s):  
Large Diameter ◽  
Large Diameter Pipe ◽  
Diameter Pipe

Structure and properties of strip for large-diameter pipe made from steel in strength categories Kh80–Kh100

Metallurgist ◽  
2009 ◽  
Vol 53 (3-4) ◽  
pp. 136-145 ◽  
Author(s):  
Yu. D. Morozov ◽  
A. M. Korchagin ◽  
V. V. Orlov ◽  
A. A. Stepanov ◽  
E. I. Khlusova ◽  
...  
Keyword(s):  
Large Diameter ◽  
Structure And Properties ◽  
Large Diameter Pipe ◽  
Diameter Pipe

Large Diameter Pipe under Combined Loading

1973 ◽  
Vol 99 (3) ◽  
pp. 521-536
Author(s):  
Jack G. Bouwkamp ◽  
R. M. Stephen
Keyword(s):  
Large Diameter ◽  
Combined Loading ◽  
Large Diameter Pipe ◽  
Diameter Pipe

Simulation of the shaping of blanks for large-diameter pipe

2011 ◽  
Vol 41 (1) ◽  
pp. 61-66 ◽  
Author(s):  
V. N. Shinkin ◽  
A. P. Kolikov
Keyword(s):  
Large Diameter ◽  
Large Diameter Pipe ◽  
Diameter Pipe
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