Transient Frequency Responses for Pressurized Water Pipelines Containing Blockages with Linearly Varying Diameters

2018 ◽  
Vol 144 (8) ◽  
pp. 04018054 ◽  
Author(s):  
T. C. Che ◽  
H. F. Duan ◽  
P. J. Lee ◽  
B. Pan ◽  
M. S. Ghidaoui
Keyword(s):  
Pressurized Water ◽  
Frequency Responses ◽  
Water Pipelines

Failure mechanics of uPVC cyclically pressurized water pipelines

1985 ◽  
Vol 20 (1) ◽  
pp. 237-245 ◽  
Author(s):  
S. H. Joseph ◽  
P. S. Leevers
Keyword(s):  
Pressurized Water ◽  
Failure Mechanics ◽  
Water Pipelines

scholarly journals Experimental study on leakage monitoring of pressurized water pipeline based on fiber optic hydrophone

2019 ◽  
Vol 19 (8) ◽  
pp. 2347-2358
Author(s):  
Chengchao Guo ◽  
Kunming Shi ◽  
Xuanxuan Chu
Keyword(s):  
Real Time ◽  
Fiber Optic ◽  
Detection System ◽  
Vibration Signal ◽  
Monitoring Method ◽  
Pressurized Water ◽  
Water Pipelines ◽  
Back Calculation ◽  
Water Pipeline ◽  
Leakage Monitoring

Abstract Leakage of water pipelines will significantly endanger the safety operation and service performance of the pipelines. Based on the vibration of pressurized water pipelines deriving from leakage, the BA-FH3200 fiber optic hydrophone (FOH) leakage detection long-term detection system was adopted in prototype tests. The vibration-based real-time leakage monitoring method of the pressurized water pipeline was studied. During the test, the leakage was simulated by opening a spherical valve in the middle of the pipe, and an FOH was placed right above the pipe wall to detect the vibration signal along the pipe. The FOH analysis software was used to monitor the pipeline operation status in real time and acquire data. Then, the data were processed by a self-developed post-processing program, and the parameters were optimized through back-calculation. The test results reveal that the leakage positioning error lay between ±0.07 m, and real-time monitoring (i.e., early warning alarm and leakage positioning) of the FOH for the pressurized water pipeline was feasible.

The influence of non-uniform blockages on transient wave behavior and blockage detection in pressurized water pipelines

2017 ◽  
Vol 17 ◽  
pp. 1-7 ◽  
Author(s):  
H.F. Duan ◽  
P.J. Lee ◽  
T.C. Che ◽  
M.S. Ghidaoui ◽  
B.W. Karney ◽  
...  
Keyword(s):  
Transient Wave ◽  
Pressurized Water ◽  
Water Pipelines

Dynamic Testing in Nuclear Power Plants for Model Validation

1976 ◽  
Vol 98 (3) ◽  
pp. 340-347 ◽  
Author(s):  
T. W. Kerlin ◽  
E. M. Katz ◽  
A. T. Chen ◽  
J. G. Thakkar ◽  
S. I. Chang
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Dynamic Testing ◽  
Reactor Power ◽  
Normal Operation ◽  
Fuel Temperature ◽  
Variable Model ◽  
Pressurized Water ◽  
Frequency Responses

Dynamics tests were preformed at the Oconee pressurized water reactor to obtain information for checking a theoretical plant model. Low level, periodic reactivity perturbations were introduced and several system responses (reactor power, temperatures, pressures) were monitored. The data were processed off-line to give frequency responses. A linear state-variable model for the plant was formulated and used to compute theoretical frequency responses. A computerized, model-reference identification procedure was used to identify the fuel temperature coefficient of reactivity and the overall fuel-to-coolant heat transfer coefficient. The study showed that dynamic tests can be performed in operating nuclear power plants with insignificant interference to normal operation. Also, the use of automatic parameter identification procedures was demonstrated.

scholarly journals Transient Wave-blockage Interaction in Pressurized Water Pipelines

2014 ◽  
Vol 70 ◽  
pp. 573-582 ◽  
Author(s):  
H.-F. Duan ◽  
P. Lee ◽  
M. Ghidaoui
Keyword(s):  
Transient Wave ◽  
Pressurized Water ◽  
Water Pipelines

Real Ear Sound Pressure Levels Developed by Three Portable Stereo System Earphones

1992 ◽  
Vol 1 (4) ◽  
pp. 52-55 ◽  
Author(s):  
Gail L. MacLean ◽  
Andrew Stuart ◽  
Robert Stenstrom
Keyword(s):  
High Frequency ◽  
Sound Pressure ◽  
Low Frequency ◽  
Test System ◽  
Output Frequency ◽  
Frequency Effects ◽  
Adult Men ◽  
Frequency Responses ◽  
Significant Difference ◽  
Sound Pressure Levels

Differences in real ear sound pressure levels (SPLs) with three portable stereo system (PSS) earphones (supraaural [Sony Model MDR-44], semiaural [Sony Model MDR-A15L], and insert [Sony Model MDR-E225]) were investigated. Twelve adult men served as subjects. Frequency response, high frequency average (HFA) output, peak output, peak output frequency, and overall RMS output for each PSS earphone were obtained with a probe tube microphone system (Fonix 6500 Hearing Aid Test System). Results indicated a significant difference in mean RMS outputs with nonsignificant differences in mean HFA outputs, peak outputs, and peak output frequencies among PSS earphones. Differences in mean overall RMS outputs were attributed to differences in low-frequency effects that were observed among the frequency responses of the three PSS earphones. It is suggested that one cannot assume equivalent real ear SPLs, with equivalent inputs, among different styles of PSS earphones.

Leaching Studies of Cement-Glass Package Containing Sodium Borate

1986 ◽  
Vol 84 ◽  
Author(s):  
Masahiro Okamoto ◽  
Koichi Chino ◽  
Tsutomu Baba ◽  
Tatsuo Izumida ◽  
Fumio Kawamura ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Liquid Waste ◽  
Sodium Borate ◽  
Pressurized Water Reactor ◽  
X Ray Diffraction ◽  
Adsorption Ability ◽  
Pressurized Water ◽  
X Ray ◽  
Solidification Reaction ◽  
Main Components

AbstractA new solidification technique using cement-glass, which is a mixture of sodium silicate, cement, additives, and initiator of the solidification reaction, was developed for sodium borate liquid waste generated from pressurized water reactor (PWR) plants. The cement-glass could solidify eight times as much sodium borate as cement could, because the solidifying reaction of the cement-glass is not hindered by borate ions.The reaction mechanism of sodium silicate and phosphoric silicate (initiator), the main components of cement-glass, was studied through X-ray diffraction and compressive strength measurements. It was found that three- dimensionally bonded silicon dioxide was produced by polymerization of the two silicates. The leaching ratio of cesium from the cement-glass package was one-tenth that of the cement one. This low value was attributed to a high cesium adsorption ability of the cement-glass and it could be theoretically predicted accordingly.

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