scholarly journals Calculation of theoretical transmission loss in trunk gas pipeline

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989544
Author(s):  
Ying Xie ◽  
Xingzhi Wang ◽  
Fangrui Mai
Keyword(s):  
Loss Rate ◽  
Transmission Loss ◽  
Gas Pipeline ◽  
Calculation Methods ◽  
Loss Assessment ◽  
Complex Flow ◽  
Assessment Index ◽  
Uncertainty Model ◽  
Uncertainty Calculation ◽  
Limited Accuracy

Owing to the limited accuracy and measurement uncertainty of the instruments installed in gas pipeline systems, it is impossible to completely avoid transmission loss during transportation of natural gas. This study established an uncertainty model for the measurement system determining the complex flow rates of trunk gas pipelines, analyzed the uncertainty calculation methods of different metering systems, and developed a calculation method for determining the theoretical transmission loss. Application showed that the theoretical transmission loss serves not only as an early warning regarding a transmission loss, but also as a guide to the pipeline enterprise for determining the transmission loss assessment index. If the actual transmission loss rate is smaller than the theoretical transmission loss rate during the calculation cycle, it means that the pipeline metering system is working normally. Otherwise, it is necessary to immediately investigate the reason behind the transmission loss and implement corresponding measures.

scholarly journals Geomatic-Based Flood Loss Assessment and Its Application in an Eastern City of China

Water ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 126
Author(s):  
Youjie Jin ◽  
Jianyun Zhang ◽  
Na Liu ◽  
Chenxi Li ◽  
Guoqing Wang
Keyword(s):  
Spatial Resolution ◽  
Loss Rate ◽  
Flash Flood ◽  
Economic Loss ◽  
Economic Losses ◽  
Risk Level ◽  
Loss Assessment ◽  
Flood Loss ◽  
Flood Disasters

Flash-flood disasters pose a serious threat to lives and property. To meet the increasing demand for refined and rapid assessment on flood loss, this study exploits geomatic technology to integrate multi-source heterogeneous data and put forward the comprehensive risk index (CRI) calculation with the fuzzy comprehensive evaluation (FCE). Based on mathematical correlations between CRIs and actual losses of flood disasters in Weifang City, the direct economic loss rate (DELR) model and the agricultural economic loss rate (AELR) model were developed. The case study shows that the CRI system can accurately reflect the risk level of a flash-flood disaster. Both models are capable of simulating disaster impacts. The results are generally consistent with actual impacts. The quantified economic losses generated from simulation are close to actual losses. The spatial resolution is up to 100 × 100 m. This study provides a loss assessment method with high temporal and spatial resolution, which can quickly assess the loss of rainstorm and flood disasters. The method proposed in this paper, coupled with a case study, provides a reliable reference to loss assessment on flash floods caused disasters and will be helpful to the existing literature.

Parallel Simulation of the Turbulent Flow Through a Pump-Turbine Runner

2002 ◽  
Author(s):  
Yu Xu ◽  
Yulin Wu
Keyword(s):  
Turbulent Flow ◽  
Message Passing Interface ◽  
Numerical Procedure ◽  
Parallel Simulation ◽  
Calculation Methods ◽  
Complex Flow ◽  
Pump Turbine ◽  
Parallel Calculation ◽  
Turbine Runner ◽  
Flow Through

In this paper, authors use the parallel calculation methods to solve the incompressible turbulent flow through a pump-turbine runner. The calculation aims at probing the road using parallel calculation methods to simulate complex flow field. The simulation is conducted based on the N-S equations, by using the k-ε model. SIMPLEC algorithm [1] is adopted in the numerical procedure with body-fitted coordination [2] and staggering grid system. The calculation is carried out on the THTF “Explore 108” Cluster Computer, where Solaris8.0 plays the roles of operating system and MPI1.2 as message-passing interface. The results of parallel simulation agree well with those of serial simulation, which shows that the parallel algorithms are feasible and useful to numerical simulation.

Uncertainty calculation methods in dose assessment for dicentric chromosome assay

2020 ◽  
Vol 96 (5) ◽  
pp. 606-613
Author(s):  
J. E. González ◽  
J. F. Barquinero ◽  
Bret A. Holladay ◽  
M. Di Giorgio ◽  
M. Higueras
Keyword(s):  
Dose Assessment ◽  
Dicentric Chromosome ◽  
Calculation Methods ◽  
Uncertainty Calculation

Environmental Loss Assessment for Gas Pipeline Failure by Considering Localize Factors Using Fuzzy Based Approach

2015 ◽  
Vol 735 ◽  
pp. 163-167 ◽  
Author(s):  
Mohd Hanafiah Norhamimi ◽  
Z. Libriati ◽  
Yahaya Nordin ◽  
M.N. Norhazilan
Keyword(s):  
Past History ◽  
Real Life ◽  
Gas Pipeline ◽  
Assessment Process ◽  
Loss Assessment ◽  
Local Conditions ◽  
Environmental Consequence ◽  
Consequence Assessment ◽  
Pipeline Failure ◽  
Environmental Loss

Consequence assessment is an integral part of risk assessment process. There are many types of consequences loss due to pipeline failure such as assets loss, environmental loss, production loss and human health and safety (HSE) loss. Yet, some of these factors are often neglected in environmental loss assessment such as agricultural, demographic, industrial and local factors. In real life problem solving, the factors of environmental consequence are not assessed precisely due to unquantifiable, deficient and lack of knowledge on the real on-site parameters. These limitations lead to the use of fuzzy-based approaches in environmental consequence assessment using on-site parameters as the main focused on this paper. Even though the basic model can be comparable to other established model, a lot of customization needs to be carried out network-wise, based on the carried products by the pipeline, locally applicable regulations and geographical surroundings. Knowledge of local conditions, past history and experience of similar incidents, are required to be considered and incorporated to provide a realistic picture of environmental consequence model. The damage area of the incident is calculated using ALOHA software by considering the details of the site such as atmospheric and topography condition. Finally, the proposed methodology is applied to a case study on high consequences areas of buried gas pipeline site in Malaysia to generate the environmental consequences index represented in each selected sites. The result can be utilized to determine the overall consequences loss using appropriate simulation analysis.

scholarly journals Effective calculation methods of the gas flow characteristics and offshore gas pipeline glaciation

2018 ◽  
Author(s):  
Kurbatova Galina Ibragimovna ◽  
Ermolaeva Nadezhda Nikolaevna ◽  
Philippov Vassili Borisovich
Keyword(s):  
Gas Flow ◽  
Flow Characteristics ◽  
Gas Pipeline ◽  
Calculation Methods

Calculation methods for the gas pipeline failure rate

2019 ◽  
Vol 174 ◽  
pp. 229-234 ◽  
Author(s):  
Jun Li ◽  
Binquan Liang ◽  
Cheng Li ◽  
Mingqing Yan ◽  
Jianjun Yu
Keyword(s):  
Failure Rate ◽  
Gas Pipeline ◽  
Calculation Methods ◽  
Pipeline Failure

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

Sign in / Sign up

Export Citation Format

Share Document