... completes closing, the vapor cavity is collapsed by the pressure head from the downstream tank and creates very sharp, high-pressure spikes. These spikes become pressure waves that move through the piping system, causing pipe shock and movement due to a phenomenon called unbalanced pressure forces...

... Detection System Performance with Non-intrusive Sensors Andrew Hoffman, Harry Smith, Jun Zhang Atmos International 2 Andrew Hoffman, Harry Smith, Jun Zhang PSIG 1931 inferred. Typical field data used include flow, pressure and temperature. Negative pressure wave the pressure wave generated by a leak...

... the paper was presented. Write Librarian, Pipeline Simulation Interest Group, 945 McKinney, Suite #106, Houston, TX 77002, USA [email protected]. ABSTRACT The Negative Pressure Wave (NPW) methodology of leak detection has potential advantages over other pipeline leak detection technologies in terms of leak...

... surge equivalent to that of instant closure. The instant closure time of a valve can be estimated as 2 L/a (L = pipeline length and a = speed of sound in fluid), which is the time required for the surge pressure wave to travel from one end of the pipeline to the other and back. The pressure wave during...

... harsh pressure waves. Hydraulic shocks can generate issues from noise, vibration, to pipe collapse due to high stresses they impose in pipes, supports, vessels, pumps, etc. The generated pressure wave travels in the pipeline system at the fluid sonic speed and it can either get attenuated or amplified...

... different portions of the risk spectrum but no single technology will mitigate all of the risk as illustrated in Figure 1. reliability decision tree pressure wave detection leak detection methodology accuracy sensitivity upstream oil & gas leak detection technology psig 1502 artificial...

... Time Transient Model Statistical analysis Negative pressure wave and Fiber Optics. After a comparison of these technologies, the following performance figures will be addressed: Minimum leak detectable Detection time Leak location accuracy False alarm rate. To achieve...