Operation of triggerable gas diverters on SYRINX/GSI water transmission line

2002 ◽  
Author(s):  
A.A. Kim ◽  
B.M. Kovalchuk ◽  
S.N. Volkov ◽  
V.A. Sinebryukhov ◽  
F. Lassalle ◽  
...  
Keyword(s):  
Transmission Line ◽  
Water Transmission

Potential for manganese biofouling in water transmission lines using model reactors

2018 ◽  
Vol 4 (6) ◽  
pp. 761-772 ◽  
Author(s):  
Nicole E. Allward ◽  
Brittany S. Gregory ◽  
Amina K. Sotddart ◽  
Graham A. Gagnon
Keyword(s):  
Water Supply ◽  
Transmission Line ◽  
Manganese Oxide ◽  
Transmission Lines ◽  
Water Transmission

Biologically mediated manganese oxide accumulation was observed in a water supply plant transmission line. A novel, putative manganese oxidizing bacterium,Candidatus Koribacter, was identified.

scholarly journals Reducing the Effects of Water Hammer Phenomenon in Pipelines by Changing the Closing Rate of Line Break Valve (LBV)

2021 ◽  
Author(s):  
Mohammad Reza Boroomand ◽  
◽  
Nasim Safar Razavizadeh ◽  
Ahmad Eshghi ◽  
◽  
...  
Keyword(s):  
Transmission Line ◽  
Initial Conditions ◽  
Saline Water ◽  
Flow Analysis ◽  
Flow Simulation ◽  
Environmental Hazards ◽  
Water Hammer ◽  
Air Chamber ◽  
Water Transmission ◽  
Closing Rate

Line break valves in pipelines are using to prevent environmental hazards caused by the entry of the fluid into the surrounding. The operation of these valves leads to sudden changes in pressure and velocity, resulting in the occurrence of the water hammer phenomenon. The water hammer pressure will cause serious problems such as the destruction of pipelines and transmission line equipment and tools. Due to the salinity of water, when a fracture occurs, the amount of water that enters the surrounding is environmentally essential, so the use of several LBVs is vital. This paper investigated a water transmission line with a total length of 337 km that transfers saline water from Khoor Moosa to Azadegan plain. This study discussed the closing of the valve at different rates and the solution to reduce its destructive effects. WaterGEMS V8i software and Hammer V8i software are respectively using to perform a steady flow simulation and damping flow analysis for this phenomenon. The results obtained from the steady-state flow simulation is the initial conditions in the damping flow calculations. Then, by reducing the closing rate of the valve in 6 different scenarios, the volume of air chambers decreased. Finally, the results led to creating a linear relationship between the valve closing rate and the capacity of the air chamber. The optimal model for this rate depends on reducing the construction cost as well as the environmental hazards caused by discharged water.

scholarly journals Effect of Dividing the Water Transmission Pipe Line in Modeling Residual Chlorine, Case Study: Isfahan Water Transmission Line

2021 ◽  
Author(s):  
Yasaman Frozandeh ◽  
Ali Dehnavi ◽  
Ahmad Shanehsazzadeh
Keyword(s):  
Transmission Line ◽  
Line Length ◽  
Residual Chlorine ◽  
Water Age ◽  
Order Model ◽  
First Order ◽  
Pipe Line ◽  
Complex Models ◽  
Chlorine Decay ◽  
Water Transmission

Abstract In assessing the quality of drinking water in transmission and distribution lines, the study on chlorine reactions is of particular importance. Chlorine decay happens in bulk and wall and it is mainly affected by the water age which depends on the transmission line length. Residual chlorine concentration in Isfahan water transmission line (IWTL) is simulated through three decay models, namely the first order, parallel first order and second order single reactant (SR model) which incorporated in EPANET and EPANET MSX, respectively. The results of the models are compared through two approaches, one is the one-part approach (OPA) whereby chlorine decay simulation is performed taking into account the whole line as one section and the second is multi-part approach (MPA) whereby the line is divided into two sections and decay coefficients of chlorine for each section are separately determined. Results show that in the OPA, the SR model in summer and the parallel model in winter are the best kinetic models. While in the MPA, the results of first order model has the same order of accuracy as the more complex models of parallel and SR models. In general, the simple first order model in the MPA applied by EPANET2.0 s/w provides acceptable level of accuracy in compare to the complex models applied in EPANET MSX s/w. The average RMSE volumes are reduced from 0.078 in OPA to 0.029 in MPA in summer and from 0.059 to 0.015 in winter, indicating that the dividing the line in simulation procedure and considering the individual decay coefficient for each part, considerably improves the results, more effectively than the application of advanced decay models.

Performance evaluation of some fusion-bonded epoxy coatings under water transmission line conditions

2008 ◽  
Vol 62 (4) ◽  
pp. 369-375 ◽  
Author(s):  
M. Mobin ◽  
A.U. Malik ◽  
I.N. Andijani ◽  
F. Al-Muaili ◽  
M. Al-Hajri ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Transmission Line ◽  
Epoxy Coatings ◽  
Water Transmission
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