Next Article in Journal
Implications of Texture and Erodibility for Sediment Retention in Receiving Basins of Coastal Louisiana Diversions
Previous Article in Journal
New Insights on the Simultaneous Removal by Adsorption on Organoclays of Humic Acid and Phenol
Article Menu

Export Article

Open AccessArticle
Water 2016, 8(1), 25; doi:10.3390/w8010025

Hydraulic Transients Caused by Air Expulsion During Rapid Filling of Undulating Pipelines

1
Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica, Politecnico di Bari, Bari 70125, Italy
2
Dipartimento di Ingegneria, Università degli Studi del Sannio, Benevento 82100, Italy
3
Dipartimento di Ingegneria Civile, Edile e Ambientale, Università degli Studi di Napoli “Federico II”, Napoli 80125, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas N. Angelakis
Received: 15 October 2015 / Revised: 11 January 2016 / Accepted: 12 January 2016 / Published: 19 January 2016
View Full-Text   |   Download PDF [1556 KB, uploaded 19 January 2016]   |  

Abstract

One of the main issues arising during the rapid filling of a pipeline is the pressure transient which originates after the entrapped air has been expelled at the air release valve. Because of the difference in density between water and air, a pressure transient originates at the impact of the water column. Many authors have analyzed the problem, both from the theoretical and the experimental standpoint. Nevertheless, mainly vertical or horizontal pipelines have been analyzed, whereas in real field applications, the pipe profile is a sequence of ascending and descending pipes, with air release/vacuum valves at high points. To overcome lack of knowledge regarding this latter case, laboratory experiments were carried out to simulate the filling of an undulating pipeline, initially empty at atmospheric pressure. The pipe profile has a high point where an orifice is installed for air venting, so as to simulate the air release valve at intermediate high point of a supply pipeline. In the experiments, the diameter of the orifice and the opening degree of both upstream and downstream valves were varied, in order to analyze their effect on the pressure transient. The experiments were also carried out with a longer descending pipe, in order to assess the effects on the pressure surge of the air volume downstream of the orifice. View Full-Text
Keywords: air valve; hydraulic transients; entrapped air; experimental data; pipes system air valve; hydraulic transients; entrapped air; experimental data; pipes system
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Apollonio, C.; Balacco, G.; Fontana, N.; Giugni, M.; Marini, G.; Piccinni, A.F. Hydraulic Transients Caused by Air Expulsion During Rapid Filling of Undulating Pipelines. Water 2016, 8, 25.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top