scholarly journals Bursting Analysis of GFRP Composite Pipline Used in Oil & Gas Applications

2019 ◽  
Vol 8 (6S2) ◽  
pp. 565-568
Keyword(s):  
Epoxy Composite ◽  
Weight Bearing ◽  
Test Results ◽  
Low Speed ◽  
Burst Test ◽  
Gfrp Composite ◽  
Composite Pipe ◽  
Pvc Pipe ◽  
Speed Effect ◽  
Oil Gas

The goal of this trial study was to research the impacts of low speed effect stacking on the weight bearing limit of the E-Glass and Epoxy Composite Pipe. In this investigation we are looking at the Burst Test Results of both PVC Pipe and FRP Pipe. The examples were loaded up with water and exposed to blast test until particular spillage disappointment is watched.

Structural Behavior of Polymer Mortar GFRP Composite Pipe

2007 ◽  
Vol 26-28 ◽  
pp. 341-344
Author(s):  
Jeong Hun Nam ◽  
Seung Sik Lee ◽  
Soon Jong Yoon ◽  
Dong Min Ok ◽  
Ju Bum Kim
Keyword(s):  
Parallel Plate ◽  
Fe Analysis ◽  
Test Results ◽  
Filament Wound ◽  
Gfrp Composite ◽  
Composite Pipe ◽  
Polymer Mortar ◽  
Loading Tests ◽  
Water Supply Pipeline ◽  
Plate Loading

This paper presents the results of experimental and analytical investigations on the behavior of GFRP pipes used in the water supply pipeline systems. The pipes consist of two filament wound outer GFRP tubes and polymer mortar between the tubes. Parallel plate loading tests were conducted and the test results were compared with predicted results. The load-deflection prediction was conducted by the FE analysis and the conventional strength of materials approach. It was shown that the results obtained by the experiment and analysis were agreed well.

scholarly journals Aerodynamics of Boundary Layer Ingesting Fuselage Fans

2021 ◽  
pp. 1-30
Author(s):  
Alejandro Castillo Pardo ◽  
Cesare A. Hall
Keyword(s):  
Boundary Layer ◽  
Pollutant Emissions ◽  
Experimental Facility ◽  
Test Results ◽  
Free Vortex ◽  
Low Speed ◽  
Fuel Burn ◽  
Design Changes ◽  
Work Input ◽  
The Impact

Abstract Boundary Layer Ingestion (BLI) potentially offers significant reductions in fuel burn and pollutant emissions. The Propulsive Fuselage Concept features a fan at the back of the airframe that ingests the 360deg fuselage boundary layer. Consequently, the distortion at the fan face during cruise is close to radial. This paper aims to devise and test a fan design philosophy that is tuned to this inflow distortion. Initially a free-vortex fan design matched to clean inflow is presented. The effects of BLI on the aerodynamics of this fan are investigated. A series of design steps are then presented to develop the baseline fan into a new design matched to fuselage BLI inflow. Both fan designs have been tested within a low speed rig. The impact of the fan design changes on the aerodynamics and the performance with BLI are evaluated using the test results. This paper presents the successful application of a unique experimental facility for the analysis of BLI fuselage fans. It shows that it is possible to design a fan that accepts the radial distortion caused by fuselage BLI with a modified profile of work input. The new fan design was found to increase the work input by 4.9% and to improve the efficiency by 2.75% relative to a fan designed for clean flow. This new fan design has reduced loading near the hub to account for the incoming distortion, increased mid span loading and negative incidence towards the tip for tolerance to circumferential distortion off-design.

Proposal of New Upper Limit of Hydrostatic Test Pressure in KT-3 of ASME Section VIII Division 3

2018 ◽  
Author(s):  
Susumu Terada
Keyword(s):  
Test Results ◽  
Design Factor ◽  
Burst Test ◽  
Increase Wall Thickness ◽  
Upper Limit ◽  
General Yielding ◽  
Test Pressure ◽  
Section Viii ◽  
Division 2 ◽  
Design Pressure

The current upper limit of hydrostatic test pressure in KT-3 of ASME Sec. VIII Division 3 is determined by general yielding through the thickness obtained by Nadai’s equation with a design factor of 0.866 (= 1.732/2). On the other hand, the upper limit of hydrostatic test pressure in 4.1.6 of the ASME Sec. VIII Division 2 is determined by general yielding through the thickness with a design factor of 0.95. In cases where a ratio of hydrostatic test pressure to design pressure of 1.43 similar to PED (Pressure Equipment Directive) is requested, the upper limit of hydrostatic test pressure may be critical for vessel design when material with a ratio of yield strength to tensile strength less than 0.7 is used. In order to satisfy the requirements in KT-3, it is necessary to decrease design pressure or increase wall thickness. Therefore, it is proposed to change the design factor of intermediate strength materials to obtain the upper limit of hydrostatic test pressure. In this paper, a new design factor to obtain the upper limit of hydrostatic test pressure is proposed and the validity of this proposal was investigated by burst test results and elastic-plastic analysis.

Test results for a low-speed centrifugal pump

1995 ◽  
Vol 31 (4) ◽  
pp. 189-192
Author(s):  
N. S. Yalovoi ◽  
A. M. Kats
Keyword(s):  
Centrifugal Pump ◽  
Test Results ◽  
Low Speed

scholarly journals The A-test: Assessment of functional recovery during early rehabilitation of patients in an orthopedic ward - content, criterion and construct validity

2014 ◽  
Vol 71 (8) ◽  
pp. 715-722 ◽  
Author(s):  
Aleksandra Vukomanovic ◽  
Aleksandar Djurovic ◽  
Zoran Popovic ◽  
Vesna Pejovic
Keyword(s):  
Hip Fracture ◽  
Construct Validity ◽  
Functional Recovery ◽  
Test Score ◽  
Weight Bearing ◽  
Hip Osteoarthritis ◽  
Early Rehabilitation ◽  
Ordinal Scale ◽  
Test Results ◽  
Orthopedic Ward

Background/Aim. The A-test was designed for assessment of functional recovery during early rehabilitation of patients in an orthopedic ward. This performance-based test consists of 10 items for assessing basic activities by a six level ordinal scale (0-5). Total scores can range from 0 to 50, i.e. from inability to perform any activity despite the help of therapists to complete independence and safety in performing all activities. The aim of this study was to examine the A-test validity. Methods. This prospective study was conducted in an orthopedic ward and included 120 patients [60 patients with hip osteoarthritis that underwent arthroplasty and 60 surgically treated patients with hip fracture (HF)] during early inpatient rehabilitation (1st-5th day). Validity was examined through 3 aspects: content validity - floor and ceiling effect, range, skewness; criterion validity - concurrent validity [correlation with the University of Iowa Level of Assistance Scale (ILAS) for patients with hip osteoarthritis, and with the Cumulated Ambulation Score (CAS) for patients with HF, Spearman rank correlation] and predictive validity [the New Mobility Score (NMS) 4 weeks after surgery, Mann-Whitney U test]; construct validity - 4 hypotheses: 1) on the fifth day of rehabilitation in patients underwent arthroplasty due to hip osteoarthritis, the A-test results will strongly correlate with those of ILAS, while the correlation with the Harris hip score will be less strong; 2) in patients with HF, the A-test results will be significantly better in those with allowed weight bearing as compared to patients whom weight bearing is not allowed while walking; 3) results of the A-test will be significantly better in patients with hip osetoarthritis than in those with HF; 4) the A-test results will be significantly better in patients younger than 65 years than in those aged 65 years and older. Results. The obtained results were: low floor (1%) and ceiling (2%) effect, range 0-50, skewness 0.57, strong correlation with ILAS for the patients with hip osteoarthritis (r = -0.97, p = 0.000) and with CAS for the patients with hip fracture (r = 0.91, p = 0.000) The patients with the A-test score 35 and more on the fifth day of rehabilitation (n = 46, Md = 4) had significantly higher NMS rank 4 weeks after surgery than the patients with the A-test score less than 35 (n = 59, Md = 2), (U = 379, z = -6.47, p = 0.000, r = 0.63). All 4 hypotheses were confirmed. Conclusion. The A-test is simple and valid instrument for everyday evaluation of pace and degree of functional recovery during early rehabilitation of patients surgically treated in an orthopedic ward.

Fracture Mode Prediction Method for Pipe With Wall-Thinning by Using the History Data of Strain Ratio

2008 ◽  
Author(s):  
Irwan Herman ◽  
Toshiyuki Meshii
Keyword(s):  
Fracture Mode ◽  
Prediction Method ◽  
Strain Ratio ◽  
Burst Pressure ◽  
Test Results ◽  
Element Analysis ◽  
Load Increment ◽  
History Data ◽  
Burst Test ◽  
Wall Thinning

In this study, based on the burst test results of pipes with wall-thinning, we have investigated the effect of flaw length δz and pipe size (mean radius Rm) on the burst pressure by using finite element analysis (FEA). Then, the history data of strain ratio εz/εθ along the load increment was used for the fracture mode prediction. Moreover, effect of the wall thickness at the flaw portion t1 on the fracture mode was investigated. Finally, fracture mode prediction method for pipes with wall-thinning was proposed.

Development of Alternate Methods for Establishing Design Margins for ASME Section VIII Division 3: Part 2

2009 ◽  
Author(s):  
Susumu Terada
Keyword(s):  
Cylindrical Shell ◽  
Spherical Shell ◽  
High Strength ◽  
Test Results ◽  
Burst Test ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Section Viii ◽  
Lower Ratio ◽  
Design Margin

The design margin against collapse for Division 3 is based on Nadal’s equation. For high strength material this method is adequate. However for material with a lower ratio of Sy/Su this method has additional margin from yielding through the thickness to final collapse or burst. The experimental burst test results for closed-end cylinder show the excessive margin for these materials as stated in former paper. Therefore the development of alternate methods for establishing design margin for all materials is desirable. The design margin of 1.5 in equation for open-end cylindrical shell and spherical shell in current code is different from that of 1.732 for closed-end cylindrical shell. The design margin of elastic-plastic analysis is 1.732. Therefore the consistent design margins of equations and elastic-plastic analysis for open-end cylindrical shells and spherical shells are also desirable. In this paper new equations for design pressure of cylindrical shell and spherical shell are proposed by investigation of burst test results and case studies of various methods.

scholarly journals ANTECEDENTS AND CONSEQUENCES OF CARBON EMISSIONS’ DISCLOSURE: CASE STUDY OF OIL, GAS AND COAL COMPANIES IN NON-ANNEX 1 MEMBER COUNTRIES

2018 ◽  
Vol 33 (2) ◽  
pp. 99 ◽  
Author(s):  
Dody Hapsoro ◽  
Ambarwati Ambarwati
Keyword(s):  
Carbon Emissions ◽  
Trading Volume ◽  
Price Volatility ◽  
Economic Consequences ◽  
Share Price ◽  
Test Results ◽  
Analysis Method ◽  
Oil Gas ◽  
Bid Ask Spreads ◽  
Positive Effect

The purpose of this study is to determine the characteristics of companies that voluntarily disclose carbon emissions and to examine the economic consequences of the carbon emissions’ disclosure. Companies used in the sample are oil, gas and coal companies in non-Annex 1 member countries registered in the Osiris database. The observation period was from the commencement of the Kyoto Protocol's second commitment to date, or from 2013 to 2016. Measuring the carbon emissions’ disclosure is achieved by using a checklist developed from an information request sheet from the CDP (Carbon Disclosure Project). An assessment of the extent of the disclosure is made using the content analysis method. Company characteristics are proxied with leverage, profitability and firm age, while the economic consequences are proxied by using bid-ask spreads, the trading volume and share price volatility. The data analysis method used in this research is the Partial Least Square (PLS) method using the WarpPLS 4.0 application. Test results show that leverage, profitability and firm age have a positive effect on the carbon emissions’ disclosure. Furthermore, the test results show that carbon emissions’ disclosures have a positive effect on the trading volume and a negative effect on the bid-ask spreads and share price volatility. The above findings imply that firms with higher leverage, higher profitability and are older are more willing to reveal their carbon emissions’ disclosures. The more information that is contained in a carbon emissions’ disclosure, the more investors are interested in trading that company's shares, while the broader the carbon emissions’ disclosure is, the smaller the bid-ask spread and the less volatile the stock price are.

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