Material fracture toughness determination for polyethylene pipe materials using small scale test results

1997 ◽  
Vol 13 (1) ◽  
pp. 63-80 ◽  
Author(s):  
Zhuang Zhuo ◽  
P. E. O'Donoghue
Keyword(s):  
Fracture Toughness ◽  
Small Scale ◽  
Test Results ◽  
Polyethylene Pipe ◽  
Scale Test ◽  
Material Fracture ◽  
Pipe Materials

Impact of Water on the Fatigue Performance of Large-Scale Grouted Connection Tests

2016 ◽  
Author(s):  
Peter Schaumann ◽  
Alexander Raba ◽  
Anne Bechtel
Keyword(s):  
Large Scale ◽  
Fatigue Tests ◽  
Fatigue Performance ◽  
Small Scale ◽  
Test Results ◽  
Ambient Conditions ◽  
Research Project ◽  
Joint Research Project ◽  
Scale Test ◽  
The Impact

Grouted connections represent a common joining technique between substructure and foundation piles of offshore oil & gas platforms as well as of offshore wind turbines. Due to cyclic loads arising from wind and wave actions the fatigue performance of the connection has to be considered. In lattice substructures like jackets the grouted connections are located at seabed level being fully submerged during their entire lifetime. Today’s fatigue design regulations are based on investigations neglecting any influence of the surrounding water since they were conducted in dry ambient conditions. So far, only Germanischer Lloyd gives additional recommendations for submerged grouted connections. At the Institute for Steel Construction, Leibniz Universität Hannover, Germany investigations of the joint research project ‘GROWup’ focus on the fatigue performance of axially loaded grouted connections. The project is funded by the Federal Ministry for Economic Affairs and Energy (BMWi, funding sign: 0325290) and is the third project in a row dealing with grouted connections. As part of this research project, cyclic loading tests on small-scale and large-scale grouted connections with shear keys are conducted. Small-scale fatigue tests showed a reduced number of endurable load cycles for connections when tested in wet ambient conditions. However, the transferability of these findings to a larger scale was still doubtful due to unknown scale effects. Therefore, the impact of water on the fatigue performance was tested recently at large-scale grouted connections. Previous to the submerged large-scale grouted connection fatigue tests, similar test specimens were exposed to alternating loads at dry ambient conditions. Comparison of both large-scale test results under wet and dry conditions enable to estimate the influence of water on the fatigue performance of grouted connections. Reflection of the small-scale test results gives hints on the scale effect. Test preparation, test results and design recommendations are presented in the paper.

Evaluation of Wearing Pipe for Subsea Mining With Large Particles in Slurry Transportation

2015 ◽  
Author(s):  
Satoru Takano ◽  
Masao Ono ◽  
Sotaro Masanobu
Keyword(s):  
Full Scale ◽  
Small Scale ◽  
Pipe Material ◽  
Test Results ◽  
Material Loss ◽  
Large Particles ◽  
Fundamental Understanding ◽  
Maximum Particle ◽  
Scale Test ◽  
Set Up

For a fundamental understanding of pipe wear under hydraulic transportation of deep-sea mining, a small scale test is conducted because there are many restrictions in conducting a full scale test. The small scale test apparatus are set up using the pipes of about 80mm in diameter and the rocks of which maximum particle diameters are about 20mm are used. In the test, the pipe materials and the pipe inclination are changed to evaluate the differential of the amount of pipe material loss. Furthermore, the amount of the pipe material loss in full scale is estimated based on the small scale test results.

scholarly journals Influence and evaluation of constraint on fracture toughness in pipeline research

2012 ◽  
Vol 3 (1) ◽  
pp. 25-35
Author(s):  
Matthias Verstraete ◽  
Stijn Hertelé ◽  
Wim De Waele ◽  
Rudi Denys
Keyword(s):  
Fracture Toughness ◽  
Full Scale ◽  
Small Scale ◽  
Width Ratio ◽  
Defect Tolerance ◽  
Edge Notch ◽  
Scale Test ◽  
Scale Structures ◽  
Tearing Resistance ◽  
Key Parameter

Accessing nowadays fossil fuel reserves requires a strain-based design approach. Within suchdesign, the ductile tearing resistance is a key parameter in assessing the defect tolerance. To determinethis tearing resistance, full scale (pressurized) tests can be performed. However, such approach would becostly and time consuming. Consequently, effort is made to select appropriate small scale test specimens.Most research has focused so far on the single edge notch bend (SENB) and tensile (SENT) specimen. Toevaluate the suitability of these test specimens, the crack tip stress fields can be examined or theresistance curves compared with full scale structures. This paper aims at comparing the trends observedusing these techniques. Furthermore, the suitability of the small scale test specimens is evaluated. It isconcluded that sufficiently long (length-to-width ratio equal to ten) clamped SENT specimens have thepotential to predict the tearing resistance of full scale pipes. In addition, the internal pressure does notsignificantly affect the fracture toughness. These conclusions are stated by both experimental results andfinite element simulations.

Relative Importance of Defects in Girth Welds of Linepipes

2007 ◽  
Author(s):  
Oddvin O¨rjasaeter ◽  
Per J. Haagensen ◽  
Hans Olav Knagenhjelm
Keyword(s):  
Small Scale ◽  
Test Results ◽  
Gas Field ◽  
Loading Mode ◽  
Radial Shrinkage ◽  
Welding Defects ◽  
Scale Test ◽  
Girth Welds ◽  
Pipeline Design ◽  
Compressive Residual Stresses

The Ormen Lange deepwater gas field is located at water depth down to 1100 meters. The irregular seabed gives severe challenges to pipeline design and verification program was launched to demonstrate adequate fatigue capacity. The research included: modern welding techniques (5G and 2G welding positions), mapping of actual welding defects, misalignment (high/low) and lack of penetration. The thick walled pipe (35mm) showed low or even compressive residual stresses at the inside. This will to some extent be “protective” to the root of the weld. The exceptions to this pattern were the repair welds and the two-sided welds. The small scale test results fell close to the full scale pipe tests when taking into account the geometrical weld distortions, loading mode, and the distribution of weld defects. The importance of the parameters influencing the fatigue capacity could be ranged as follows, most detrimental first: large crack-like defects (LOP, undercut > 1mm), hi/lo, and V-shape (radial shrinkage at the girth weld).

Pipeline-Trawl Interaction: Effect of Trawl Clump Weights

2006 ◽  
Author(s):  
Olav Fyrileiv ◽  
Dag O̸. Askheim ◽  
Richard Verley ◽  
Hanne Rolsdorph
Keyword(s):  
Interaction Effect ◽  
Steel Frame ◽  
Bottom Trawl ◽  
Small Scale ◽  
Test Results ◽  
Heavy Weight ◽  
New Type ◽  
Scale Test ◽  
Qualification Testing ◽  
Swept Area

This paper deals with clump weights, a new type of component in bottom trawl gear that needs to be considered in design and reassessment of pipelines. In recent years it has become popular to use two trawl bags, a so-called twin trawl, to increase the swept area and, thus, the efficiency of the trawler. In addition to the trawl boards at each side of the trawl bags, a heavy weight, a clump weight, is used between the bags to keep them close to the seabed. Clump weights can have a mass up to 9 tonnes, and the largest ones are shaped as spheres or cylinders inside a steel frame. Tests performed have revealed that the loads on pipelines from clump weights may exceed the corresponding loads from trawl boards. Thus, interaction with clump weights may govern the design and qualification testing of coating, and the design related to global pipeline response. This paper discusses loads from clump weights. Updated design approaches including pull-over load estimates are presented. The background in terms of small scale test results is also shown for some cases. The conclusion is that clump weights may govern the trawl design of pipelines, especially for trawl gear impact and pull-over.

scholarly journals eMMI (e-MODULE MULTIPLE INTELLIGENCE) : MODUL FISIKA DASAR MAHASISWA DENGAN 3D PAGEFLIP PRO

2021 ◽  
Vol 4 (1) ◽  
pp. 67-72
Author(s):  
Khoirun Nisa ◽  
Ismi Nurul ◽  
Mistianah Mistianah
Keyword(s):  
Data Collection ◽  
Learning Process ◽  
Circulatory System ◽  
Multiple Intelligence ◽  
Small Scale ◽  
Test Results ◽  
Physics Learning ◽  
Scale Test ◽  
Planning Development ◽  
D Model

This study aims to produced eMMI based on multiple intelligence (eMMI) with 3D pageflip pro for biology student’s in IKIP Budi Utomo Malang, in the circulatory system material that is suitable for used in the learning process. This research was developed with a 4-D model consisting of definitions, planning, development and dissemination. Data collection using a questionnaire. This eMMI have been validated by material experts and media experts.The evaluation results from material validation, is known that above 90%, while the results of media validation are above 96%. Small scale test results indicate the validity results above 90%. From the results of the validation of media experts and material experts, it is stated that the e-eMMIe is suitable for use and based on the questionnaire, it can be said that students and teachers are expected to really take advantage of teaching materials in order to create interesting and fun learning in physics learning.

Hybrid Catalytic Combustion for Stationary Gas Turbine: Concept and Small Scale Test Results

1987 ◽  
Author(s):  
Tomiaki Furuya ◽  
Terunobu Hayata ◽  
Susumu Yamanaka ◽  
Junji Koezuka ◽  
Toshiyuki Yoshine ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Gas Phase ◽  
Gas Turbines ◽  
Catalytic Combustion ◽  
Small Scale ◽  
Inlet Temperature ◽  
Test Results ◽  
Turbine Inlet Temperature ◽  
Scale Test ◽  
Near Future

Catalytic combustion for gas turbine applications has been investigated. Its significant advantages in reducing combustor emissions, particularly nitrogen oxides (NOx), have been shown. One of the main problems in regard to developing a catalytic combustor is the durability of catalysts, because the catalysts deteriorate during high temperature operation, which is normal for current gas turbines and near future gas turbines. The hybrid catalytic combustion concept has advantages concerned with catalyst durability. This paper shows its concept and small scale test results. This hybrid catalytic combustion concept comprises the following steps; premix fuel and air for a catalyst-packed zone; operate catalysts at rather low temperatures, to prolong catalyst life; add fresh fuel into the stream at the catalyst-packed zone outlet, where gas phase combustion occurs completely without a catalyst; add dilution air into the stream at the gas phase combustion zone outlet with a by-pass valve. Experimental data and analyses indicated that this hybrid catalytic combustion has a potential of being applicable to current gas turbines (turbine inlet temperature is about 1100°C) and near future gas turbines (turbine inlet temperature is about 1300°C).

Gas and Water Permeation in Flexible Pipes

2002 ◽  
Author(s):  
Tore Roberg Andersen ◽  
Jan Ivar Skar
Keyword(s):  
Large Scale ◽  
Cold Water ◽  
Small Scale ◽  
Test Results ◽  
Test Program ◽  
Flexible Pipe ◽  
Water Permeation ◽  
Flexible Pipes ◽  
Scale Test ◽  
Temperature And Pressure

A test program has been performed to obtain the permeation coefficients for methane, carbon dioxide and water in PVDF. Small-scale tests showed that water is transported through the PVDF inner sheath of the flexible pipes, and into the annulus. A large-scale test was carried out to verify the small-scale test results. It was performed in a 2″ flexible pipe with length 3 m. The bore temperature and pressure were 100°C and 50 bar, respectively. The pipe was submerged in cold water in order to get a correct temperature gradient in the pipe. The test showed that the annulus of flexible pipe with PVDF inner sheath would become water wet due to permeation, depending upon the bore and annulus conditions.

scholarly journals Pengembangan Buku Ajar Perkoperasian Indonesia Dalam Perkuliahan Mahasiswa Prodi Pendidikan Ekonomi

2020 ◽  
Vol 4 (2) ◽  
pp. 243-252
Author(s):  
Putri Vina Sefaverdiana ◽  
Melisa Wahyu Fandyansari
Keyword(s):  
Research And Development ◽  
Student Learning ◽  
Large Scale ◽  
Small Scale ◽  
Development Research ◽  
Test Results ◽  
Scale Test ◽  
Improve Student Learning

Indonesian Cooperative textbooks are development research aimed at developing quality textbooks and can effectively improve understanding of existing cooperatives in Indonesia. Textbooks as a support in Cooperative lectures, in order to improve student learning in class so that students have understanding and skills in cooperating. The purpose of this textbook is to make it easier for students to learn and understand as a provision for students to develop cooperatives in their respective areas of residence. The method in this research is a research and development research using a model from Dick and Carrey. The test results obtained from the first material expert were 84.5%, the second material expert obtained 76.4%. 3%. After the expert test was carried out a small-scale test where the result was 82.6% and the large-scale test obtained a result of 86.3%. From the results of the percentage, it states that the textbook is in the good category and is feasible to apply

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