Encouraging Effective Air Management in Water Pipelines: A Critical Review

@article{Ramezani2016EncouragingEA,
  title={Encouraging Effective Air Management in Water Pipelines: A Critical Review},
  author={Leila Ramezani and Bryan W Karney and Ahmad Reza Malekpour},
  journal={Journal of Water Resources Planning and Management},
  year={2016},
  volume={142},
  pages={04016055}
}
AbstractAir can be entrapped in water and wastewater systems under a variety of conditions, and if such air is not managed properly, it can impose considerable operational penalties. To avoid these problems and the dangers associated with air pockets, several air management strategies have been routinely suggested. However, the devastating consequences of air pockets frequently documented in the literature imply the need for further development in this area. Improving air management obviously… 

Figures from this paper

Utilizing siphon for effective management of air in gravity-fed water pipelines

A novel siphon design has been invented and continuously optimized by Mr. Weng to adapt various pipe diameters since 1990. Within the past 30 years of practical experience, although its success is in

Hydraulic modeling during filling and emptying processes in pressurized pipelines: a literature review

ABSTRACT Filling and emptying processes are common maneuvers while operating, controlling and managing water pipeline systems. Currently, these operations are executed following recommendations from

Subatmospheric pressure in a water draining pipeline with an air pocket

ABSTRACT An air pocket’s behaviour inside of a pipeline during transient conditions is of great importance due to its effect on the safety of the hydraulic system and the complexity of modeling its

Transient Phenomena Generated in Emptying Operations in Large-Scale Hydraulic Pipelines

Air pockets generated during emptying operations in pressurized hydraulic systems cause significant pressure drops inside pipes. To avoid these sudden pressure changes, one of the most widely used

Experimental Investigation on Air-Water Interaction in a Hydropower Station Combining a Diversion Tunnel with a Tailrace Tunnel

Diversion tunnels are often used as tailrace tunnels in underground hydropower stations. The special layout results in complex flow regimes, including air-water two-phase flow. A set of experiments

Concerning Dynamic Effects in Pipe Systems with Two-Phase Flows: Pressure Surges, Cavitation, and Ventilation

The risks associated with unsteady two-phase flows in pressurized pipe systems must be considered both in system design and operation. To this end, this paper summarizes experimental tests and

The Crucial Importance of Air Valve Characterization to the Transient Response of Pipeline Systems

Air valves are often crucial components in an air management strategy for pressurized water conveyance systems. However, the reliability of characteristic curves of air valves found in product

Unsteady Pressures Influenced by Trapped Air Pockets in Water-Filled Pipelines

Trapped air pockets may cause severe operational problems in water-filled pipelines. This paper investigates the dynamic behaviour of a single trapped air pocket. A single air pocket creates distinct

Simplified Mathematical Model for Computing Draining Operations in Pipelines of Undulating Profiles with Vacuum Air Valves

The draining operation involves the presence of entrapped air pockets, which are expanded during the phenomenon occurrence generating drops of sub-atmospheric pressure pulses. Vacuum air valves

Modelling and simulation of transient air-water two-phase flows in hydraulic pipes

The present work is dedicated to the mathematical and numerical modelling of transient air-water flows in pipes which occur in piping systems of several industrial areas such as nuclear or

References

SHOWING 1-10 OF 101 REFERENCES

Air in pipelines - a literature review

The entry, control and release of air from pipelines is a major, though often, hidden problem in pipelines used for water supply, foul water drainage and effluent discharge. Considerable cost can be

Investigating hydraulic removal of air from water pipelines

The presence of air in pipe systems can result in problems such as loss of carrying capacity, disruption of the flow, reduced pump and turbine efficiency, effects on pipe materials and pipeline

Influence of Surface Tension on Air-Water Flows

AbstractStricter environmental regulations have led to new wastewater treatment plants and a centralization of existing wastewater treatment plants. Therefore, pressurized wastewater mains have

Air water flows in building drainage systems

This paper investigates the mechanisms of two-phase flows that occur in commercial and industrial roof drainage systems. Both traditional gravity-fed and siphonic roof drainage systems are examined.

Capacity reduction caused by air intake at wastewater pumping stations

In the Netherlands, wastewater is normally collected in combined sewer system and pumped to the WWTP through pressure mains. These pressure mains are a part of the system that did not receive much

Reduction of Damage and Hindrance to Wastewater Transmission Systems Caused by Air Pockets by Deployment of Air Valves

Recent research studies and surveys have shown that air pockets in wastewater transmission systems cause extensive damage and hindrance. Air pockets decrease flow capacity, they induce significant

Detection of gas pockets in pressurised wastewater mains using dynamic system response analysis.

  • C. LubbersF. Clemens
  • Engineering
    Water science and technology : a journal of the International Association on Water Pollution Research
  • 2007
The layout of the experimental set-up to detect and diagnose gas problems is described and the first results of the experiments are presented and discussed and a model developed by Delft Hydraulics that describes the phenomena involved in surges in air/water transport is validated.

Mechanisms for Air Pocket Entrapment in Stormwater Storage Tunnels

The behavior of stormwater systems can be greatly altered by the presence of air pockets within the pressurized portion of the flow. While rapid filling conditions in stormwater storage tunnels can

Analysis of effects of air pocket on hydraulic failure of urban drainage infrastructure

The effects of trapped air on flow oscillations and pressure surges in a model trunk sewer–manhole system subject to rapid filling are investigated. The study reveals the detrimental impacts of

Experimental investigation of air pockets in pumping pipeline systems

Air in pipelines may cause insignificant to severe operational difficulties. If air pockets remain at high points of pumping pipelines, they can cause problems such as a reduction of the effective
...