In the long distance pressure pipeline, sudden change of instantaneous caused by rapid liquid velocity is called water hammer, which seriously threatens safe operation hydropower station. this paper, development and calculation methods transient flow percussion theory are introduced, different models numerical analyzed compared. Finally, problems in research hammer prevention measures summarize...

High-concentration viscous paste has a large conveying resistance during transport in high-pressure long-distance pipelines. When the pump reverses, pipeline flows back, which not only causes violent vibration of system, but also reduces efficiency. To study transient flow characteristics and backflow reverse process, we established quasi-two-dimensional model for transportation straight pipe b...

This thesis concerns grey cast iron gas pipelines in Amsterdam managed by the regional gas and electricity grid operator Liander. Due to brittle nature and aging process of grey cast iron, probability of explosion in this type of pipelines seems to be increasing. A model for the gas explosion probability is proposed. Multiple factors are taken into consideration, including pipe’s age, length, w...

In addition to photovoltaic and wind systems, nowadays in-pipe water to wire power systems are becoming particularly interesting for the integration of renewable resources at urban and building scale because of the potential to harness clean energy from excess head pressure in urban and domestic water pipelines. Able to operate across a wide range of head and flow conditions, these particular m...

The pressure at the natural gas wellhead typically ranges from tens to hundreds of atmospheres. Traditionally, must be throttled into a low level satisfy requirement gathering pipelines, in which large amount energy is wasted. high-pressure oil–gas turbine promising approach convert shaft power or electricity. In this paper, numerical investigation conducted on radial-outflow utilized generatio...

Gas hydrates (GHs) are known to pose serious flow assurance challenges for the oil and gas industry. Neverthless, over last few decades, hydrates-based technology has been explored various energy- environmentally related applications. For both applications, a controlled formation of GHs is desired. Management hydrate by allowing them form within pipelines in their complete mitigation preferred....

Traditionally in workshops conflicts arise between requirements for the safety of human beings and requirements to prevent stray currents. Within workshops more strict limits for step and touch voltages apply than for the rest of the railway system. These requirements can be met in case the running rails are connected to ground, but this will increase stray currents. As The Netherlands is a ver...

using natural gas as a clean, plentiful and inexpensive source of energy in recent years has progressively increased in iran. pipelines are the most common system to transport natural gas from field to different regions of iran. these pipelines always pose risks to surrounding population and environments. the aim of this study was to assess the potential health, safety, and environment risk of ...

the critical temperatures of a thermomechanical process have a great importance for the final microstructure and mechanical properties of high strength low alloy steels. in this study, the average scheduling was used to determine the critical temperatures of api x70 steel. this steel is extensively used in iran for large diameter, high-pressure gas transportation pipelines as well as the oil tr...