Fitness-for-Service Assessment of Piping Subject to Random Vibration

2016 ◽  
Author(s):  
Lyle Breaux ◽  
Scot McNeill ◽  
Gyorgy Szasz
Keyword(s):  
Random Vibration ◽  
Cyclic Stress ◽  
Allowable Stress ◽  
Vibration Level ◽  
Vibration Loading ◽  
Design Life ◽  
The Subject ◽  
Level 1 ◽  
Target Design ◽  
Level 2

A methodology is presented for Level 1 and 2 Fitness-for-Service (FFS) assessments of process and power piping subject to random vibration loading. The intent is to provide a basis for random vibration assessment based on concepts from spectral fatigue, which is simplified to the degree that a non-specialist can conduct the FFS assessment with little prior knowledge of the subject matter. The proposed Level 1 FFS assessment is based on extension and generalization of established industry screening curves for piping vibration. The measured (overall) RMS vibration level is compared against allowable values given by the curves evaluated at the average crossing frequency of the measured vibration. The proposed Level 2 FFS assessment utilizes an allowable cyclic stress. The allowable stress is a function of the target design life as well as the average crossing frequency and kurtosis of the measured vibration. Both approaches are illustrated by example.

scholarly journals PERBANDINGAN MARGIN PEMASARAN BERAS BERDASARKAN MUSIM PANEN DI KECAMATAN KAKAS BARAT

2016 ◽  
Vol 12 (3) ◽  
pp. 125
Author(s):  
Andriano R. Manoppo ◽  
Joachim N K. Dumais ◽  
Paulus A. Pangemanan
Keyword(s):  
Secondary Data ◽  
Marketing Channel ◽  
Primary Data ◽  
Selling Price ◽  
Channel Pattern ◽  
Marketing Efficiency ◽  
The Subject ◽  
Level 1 ◽  
The Cost ◽  
Level 2

This research aimed to compare the marketing margin on farmers, traders, and retailers in the harvest of last season and the season now and see rice marketing distribution channels. As a very important sector, rice is still facing many problems, especially with regard to the welfare of peasant producers. Rice marketing issues, including low selling price at the level of farmers marketing channel pattern, margin and marketing efficiency. This research was conducted in the district of West Kakas in four villages namely Tountimomor, Passo, Panasen, Kalawiran, as the biggest producer in West Kakas and this research during the month of July until completed. The data obtained are primary and secondary data. Primary data sourced from the opinions and interviews with related parties are the subject of research. Secondary data is data obtained by researchers who comes from a document from the relevant authorities, such as: internet, literature sources or literature books and the Central Bureau of Statistics. This study uses a snowball to the rice marketing channel. Based on research conducted showed that the cost and the marketing margin level channel 1 at harvest 1 lower than the cost and the marketing margin level channel 1 for the season 2, also the cost and marketing margin on channel 2 at harvest level 1 is still lower than the cost and the marketing margin at the channel level 2 for the season 2. The greater the marketing margin, the more inefficient the marketing system.

scholarly journals Kemampuan Berpikir Kreatif Siswa dalam Pemecahan Masalah dengan Konteks Covid-19

2021 ◽  
Vol 4 (1) ◽  
pp. 15-30
Author(s):  
Julia Ayu Wulandari ◽  
Tatag Yuli Eko Siswono
Keyword(s):  
Data Analysis ◽  
Creative Thinking ◽  
Research Subjects ◽  
Mathematics Problems ◽  
Level 3 ◽  
The Subject ◽  
Level 1 ◽  
Math Problems ◽  
Level 2 ◽  
Different Levels

This study aims to describe the creative thinking abilities of students based on their level of creative thinking in solving math problems in the context of covid 19. Data collection was carried out by providing a test for solving mathematics problems in the context of Covid 19. Data analysis techniques were data reduction, data presentation, and conclusion drawing. Data analysis is to see how the student is solving problems with what ideas can be given. The research subjects were four students with different levels of creative thinking, then interviewed how the students completed these problems. The results showed that the subject at level 0 (not creative) only gave one answer and one way of solving the problem. Subjects with creative thinking level 1 (less creative), able to produce two different answers, and able to present data in two ways of presenting data, but only one is correct. Then the subject with level 2 (creative enough), can give one answer correctly and two ways of presenting the data correctly. While the subject with level 3 (creative) thinking can produce two different answers correctly and two ways of presenting data correctly.

scholarly journals LEVEL BERPIKIR GEOMETRI MENURUT TEORI VAN HIELE BERDASARKAN KEMAMPUAN GEOMETRI DAN PERBEDAAN GENDER SISWA KELAS VII SMPN 8 PAREPARE

2016 ◽  
Vol 4 (2) ◽  
pp. 103 ◽  
Author(s):  
Lisa Aditya Dwiwansyah Musa
Keyword(s):  
Gender Differences ◽  
Female Student ◽  
Male Student ◽  
Ability Test ◽  
Van Hiele ◽  
Van Hiele Theory ◽  
The Subject ◽  
Level 1 ◽  
And Gender ◽  
Level 2

The study aimed at describing the level in thinking geometry according to Van Hiele theory based on geometry ability and gender differences. The subjects of the study were 4 people consisted of a male student with high geometry ability (LT), a female student with high geometry ability (PT), a male student with low geometry ability (LR), and a female student with low geometry ability (PR). The instrument of the study was the researcher herself as the main instrument assisted by test of geometry ability, test of Van Hiele, and guided interview which was valid and reliable. Data were collected by conducting test and test-based interview. The subject of the study grade VII students consisted of 4 people. The process of the study was conducted in several steps, namely (a) formulating the indicator of the level in thinking geometry according to Van Hiele theory based on the relevant theory and research, (b) formulating the supporting instrument (test of geometry ability, test of Van Hiele geometry, and guided interview) which was valid and reliable, (c) deciding the research subjects by providing test of geometry ability, (d) obtaining the data to reveal the level in thinking geometry of students on the characteristics of tetragon, (e) conducting time triangulation to obtain valid data, (f) conducting data analysis of the level in thinking geometry of students according to Van Hiele theory based on the geometry ability and gender differences, (g) conducting the discussion of the result of analysis, and (h) conducting conclusion drawing of the result of the study. The result of the study revealed that (1) the subject of LT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (2) the subject of PT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (3) the subject of LR was in level 1 of analysis, the subject could determine the characteristics of a plane; where as (4) the subject of PR was in level 1 of analysis, subject could determine the characteristics of a plane.

Establishing Fracture Mechanics Based Minimum Allowable Temperatures for Low Temperature Applications of ASME B31.3 Piping

2018 ◽  
Author(s):  
Seetha Ramudu Kummari ◽  
Brian Macejko ◽  
Kraig S. Shipley ◽  
Phillip E. Prueter ◽  
Geoff Evans ◽  
...  
Keyword(s):  
Low Temperature ◽  
Fracture Mechanics ◽  
Relaxation Effect ◽  
Allowable Stress ◽  
Section Viii ◽  
Level 1 ◽  
Major Crack ◽  
Stress Criteria ◽  
Level 2 ◽  
Temperature Applications

Impact test exemption curves in ASME B31.3 [1] were adopted from ASME Section VIII Division 1 (VIII-1) [2] with subtle modifications. The VIII-1 exemption curves were generated based on early fracture mechanics methodologies and limited amount of test data with an assumption on maximum applied stress intended to correspond to the typical VIII-1 allowable stress criteria. The applicability of the exemption curves for low temperature applications of ASME B31.3 piping (such as blowdown events) is open to discussion because of potentially high longitudinal thermal expansion stresses that may exceed the VIII-1 allowable stress criteria. Additionally, unlike in VIII-1 and ASME Section VIII Division 2 (VIII-2) [3], there is no post weld heat treatment (PWHT) credit on Minimum Design Metal Temperature (MDMT) in ASME B31.3. Detailed fracture mechanics analyses have shown that PWHT can significantly reduce the risk of brittle fracture failures due to its relaxation effect on weld residual stresses, a major crack driving force. In this paper, a fracture mechanics-based methodology for establishing Minimum Allowable Temperatures (MAT) for low temperature applications of ASME B31.3 piping is presented. A state-of-the-art fracture mechanics methodology published in Welding Research Council (WRC) Bulletin 562 [4] is used to develop step-by-step Level 1 and Level 2 procedures for establishing MAT for low temperature applications of ASME B31.3 piping. For the Level 1 methodology, MAT screening curves are developed based on a likely conservative assumption that the stresses in the piping component are at the maximum code allowable stresses in both the hoop and longitudinal directions. For the Level 2 methodology, stress ratio verses temperature reduction curves are developed to consider the effect of lower operating stresses. Similar to VIII-2 [3] toughness exemption curves, the screening curves are generated for both As-Welded and PWHT conditions. The curves can also be used for impact tested materials. The established MAT can be directly coupled to different reference flaw sizes and integrated with an inspection criteria for piping components. Two examples of establishing MAT using both the proposed Level 1 and Level 2 methodologies are presented herein.

scholarly journals Electronic commerce in Ukraine: controversial aspects of legal and regulatory framework

2017 ◽  
pp. 119-126
Author(s):  
Zenoviy Zadorozhnyi
Keyword(s):  
Electronic Commerce ◽  
Subject Matter ◽  
Regulatory Framework ◽  
International Standards ◽  
National Legislation ◽  
Key Points ◽  
Level 3 ◽  
The Subject ◽  
Level 1 ◽  
Level 2

The subject matter of the research paper is legal and regulatory framework of electronic commerce in Ukraine. The article systematizes the current laws and regulations which govern business activities of e-commerce enterprises and their accounting policies in order to identify areas for further improvement. The methods of systematization and generalization are used in the research for considering a set of regulatory and legal acts applicable to e-commerce enterprises in Ukraine. The study highlights key points for improving legal and regulatory framework related to e-commerce enterprises. Business activities of e-commerce enterprises and principles of accounting basis are viewed as divided into three levels: level 1 – The Constitution of Ukraine and the Codes of Laws; level 2 – The Laws of Ukraine; level 3 – subordinate legislation. An analysis is carried out to determine regulatory and legal acts related to electronic commerce of each of the above-mentioned levels. It is proposed to make amendments and additions to certain regulatory and legal acts with the aim of eliminating obsolete con- cepts and harmonization of legislation. It is proved that one of the key points for improving e-commerce in Ukraine is bringing the national legislation related to electronic commerce into compliance with EU laws and international standards.

scholarly journals Level Berpikir Geometri Menurut Teori Van Hiele Berdasarkan Kemampuan Geometri dan Perbedaan Gender Siswa Kelas VII SMPN 8 Pare-Pare

2018 ◽  
Vol 4 (2) ◽  
pp. 103-116 ◽  
Author(s):  
Lisa Aditya Dwiwansyah Musa
Keyword(s):  
Gender Differences ◽  
Female Student ◽  
Male Student ◽  
Ability Test ◽  
Van Hiele ◽  
Van Hiele Theory ◽  
The Subject ◽  
Level 1 ◽  
And Gender ◽  
Level 2

The study aimed at describing the level in thinking geometry according to Van Hiele theory based on geometry ability and gender differences. The subjects of the study were 4 people consisted of a male student with high geometry ability (LT), a female student with high geometry ability (PT), a male student with low geometry ability (LR), and a female student with low geometry ability (PR). The instrument of the study was the researcher herself as the main instrument assisted by test of geometry ability, test of Van Hiele, and guided interview which was valid and reliable. Data were collected by conducting test and test-based interview. The subject of the study grade VII students consisted of 4 people. The process of the study was conducted in several steps, namely (a) formulating the indicator of the level in thinking geometry according to Van Hiele theory based on the relevant theory and research, (b) formulating the supporting instrument (test of geometry ability, test of Van Hiele geometry, and guided interview) which was valid and reliable, (c) deciding the research subjects by providing test of geometry ability, (d) obtaining the data to reveal the level in thinking geometry of students on the characteristics of tetragon, (e) conducting time triangulation to obtain valid data, (f) conducting data analysis of the level in thinking geometry of students according to Van Hiele theory based on the geometry ability and gender differences, (g) conducting the discussion of the result of analysis, and (h) conducting conclusion drawing of the result of the study. The result of the study revealed that (1) the subject of LT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (2) the subject of PT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (3) the subject of LR was in level 1 of analysis, the subject could determine the characteristics of a plane; where as (4) the subject of PR was in level 1 of analysis, subject could determine the characteristics of a plane.

scholarly journals STUDENTS’ STATISTICAL REASONING IN STATISTICS METHOD COURSE

2019 ◽  
Vol 14 (1) ◽  
pp. 81-90
Author(s):  
Rohana Rohana ◽  
Yunika Lestaria Ningsih
Keyword(s):  
Research Method ◽  
Statistical Reasoning ◽  
Reasoning Ability ◽  
Descriptive Research ◽  
Level 3 ◽  
The Subject ◽  
Level 1 ◽  
Academic Year ◽  
Level 2

The role of statistics is wide and crucial in daily life, making statistics important. Many students have difficulty understanding statistics. This study aims to determine students' statistical reasoning about inference statistics, which is limited to the subject matter of the testing hypotheses about two-sample hypotheses testing. This study used descriptive research method. The subjects were 25 students of third-year Mathematics Education Departement at Universitas PGRI Palembang in the academic year 2018/2019. Data were collected through tests and interviews. Data were analyzed through descriptive quantitative. The results of data analysis showed that 32% of students had level 1 statistical reasoning (the lowest level), 20% were at level 2, 28% at level 3, 12% at level 4 and 8% at level 5 (highest level). Based on the result, it can conclude that students' statistical reasoning ability in learning statistical method is not satisfactory, students are still very lacking in reasoning.

ANALISIS KEMAMPUAN KOMUNIKASI MATEMATIS DALAM MENYELESAIKAN MASALAH STATISTIKA

2018 ◽  
Vol 5 (2) ◽  
pp. 7 ◽  
Author(s):  
Ahmad Aunur Rohman
Keyword(s):  
Level 1 ◽  
Level 2

Penelitian ini dimaksudkan untuk mengetahui bagaimana kemampuan komunikasi matematis mahasiswa terhadap pemahaman statistika. Data dalam penelitian ini berupa hasil pekerjaan tes tertulis tentang kemampuan komunikasi matematis dan wawancara terhadap subjek penelitian. Pengumpulan data diperoleh dengan tes dan wawancara. Uji keabsahan data yang digunakan adalah triangulasi. Data penelitan yang terkumpul dianalisis dengan analisis data non statistik yang terdiri dari tiga alur, yaitu reduksi data, penyajian data, dan penarikan kesimpulan/verifikasi data. Hasil penelitian menunjukkan bahwa 1) Terdapat 5 mahasiswa yang berada pada level 0 (sangat kurang baik); 2) 24 mahasiswa berada pada level 1 (kurang baik); 3) 6 mahasiswa berada pada level 2 (cukup baik); Penelitian ini diharapkan dapat memacu individu lain untuk melakukan penelitian yang lebih baik dan mendalam tentang kemampuan komunikasi matematis.

EVALUASI PELATIHAN DI PT. PUPUK KUJANG CIKAMPEK

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Lania Muharsih ◽  
Ratih Saraswati
Keyword(s):  
Training Evaluation ◽  
Work Productivity ◽  
Learning Behavior ◽  
Level 3 ◽  
Level 1 ◽  
Four Levels ◽  
A Company ◽  
Level 2 ◽  
Evaluation Sheet ◽  
Assessment Factor

This study aims to determine the training evaluation at PT. Kujang Fertilizer. PT. Pupuk Kujang is a company engaged in the field of petrochemicals. Evaluation sheet of PT. Fertilizer Kujang is made based on Kirkpatrick's theory which consists of four levels of evaluation, namely reaction, learning, behavior, and results. At level 1, namely reaction, in the evaluation sheet is in accordance with the theory of Kirkpatrick, at level 2 that is learning should be held pretest and posttest but only made scale. At level 3, behavior, according to theory, but on assessment factor number 3, quantity and work productivity should not need to be included because they are included in level 4. At level 4, that is the result, here is still lacking to get a picture of the results of the training that has been carried out because only based on answers from superiors without evidence of any documents.   Keywords: Training Evaluation, Kirkpatrick Theory.    Penelitian ini bertujuan mengetahui evaluasi training di PT. Pupuk Kujang. PT. Pupuk Kujang merupakan perusahaan yang bergerak di bidang petrokimia. Lembar evaluasi PT. Pupuk Kujang dibuat berdasarkan teori Kirkpatrick yang terdiri dari empat level evaluasi, yaitu reaksi, learning, behavior, dan hasil. Pada level 1 yaitu reaksi, di lembar evaluasi tersebut sudah sesuai dengan teori dari Kirkpatrick, pada level 2 yaitu learning seharusnya diadakan pretest dan posttest namun hanya dibuatkan skala. Pada level 3 yaitu behavior, sudah sesuai teori namun pada faktor penilaian nomor 3 kuantitas dan produktivitas kerja semestinya tidak perlu dimasukkan karena sudah termasuk ke dalam level 4. Pada level 4 yaitu hasil, disini masih sangat kurang untuk mendapatkan gambaran hasil dari pelatihan yang sudah dilaksanakan karena hanya berdasarkan dari jawaban atasan tanpa bukti dokumen apapun.   Kata kunci: Evaluasi Pelatihan, Teori Kirkpatrick.

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