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ANALYSIS OF TRANSIENT FLOW PHENOMENON IN PRESSURIZED PIPES SYSTEM AND METHODS OF PROTECTION

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Last updated: 04 Jan 2025

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Tags

Civil Engineering: structural, Geotechnical, reinforced concrete and s…nd sanitary engineering, Hydraulic, Railway, construction Management.

Abstract

Water hammer phenomenon is an important consideration in designing of many hydraulic systems due to extreme variations in pressure it causes. For example, the dramatic pressure rise can cause pipes to rupture. Accompanying the high pressure wave, there is a negative wave that can cause very low pressures leading to the possibility of contaminant intrusion or column separation. This paper investigates the effect of different parameters such as fluid density, steady flow velocity, air entrainment, pipeline material type and pipeline friction factor on transient flow in pipeline system due to pump shut down, effect of protection devices on the transient pressure head along the pipeline and effect of existence of a crack in pipeline flow. WHAMO software was used in the analysis which uses the implicit finite difference scheme for solving the momentum and continuity equations at unsteady state case. The study was applied on a pipeline composed of six segments of different diameters and elevations with a total length of 2523 m. The flow is pumped in the pipeline by pumping station to a constant head reservoir at the end of the pipeline. The results showed that many parameters such as fluid density, steady flow velocity, air entrainment, pipeline material type and pipeline friction factor have significant effect on the water hammer phenomenon. Also, it was found that in spite of the non-return valve protects the pump from water hammer effect, increases the pressure head in the pipeline. Surge tank or air chamber fitted at the beginning of the pipeline can protect it effectively from the water hammer effect. At the end, it was found that a crack in pipeline can cause intrusion from outside the pipe to inside and inversely can cause leakage to outside or both.

DOI

10.21608/jesaun.2010.124369

Keywords

Water Hammer, pipelines, hydraulic parameters, protection, intrusion, Leakage

Authors

First Name

Nashaat A.

Last Name

Ali

MiddleName

-

Affiliation

Civil Eng. Dept, Assiut University, Assiut, Egypt

Email

-

City

-

Orcid

-

First Name

Hassan

Last Name

Ibrahim

MiddleName

-

Affiliation

Civil Eng. Dept, Assiut University, Assiut, Egypt

Email

hassanmohamed_2000@yahoo.com

City

-

Orcid

-

First Name

Mohamed E.

Last Name

El-Darder

MiddleName

-

Affiliation

Civil Eng. Dept, Assiut University, Assiut, Egypt

Email

-

City

-

Orcid

-

First Name

Alaa A.

Last Name

Mohamed

MiddleName

-

Affiliation

Civil Eng. Dept, Assiut University, Assiut, Egypt

Email

-

City

-

Orcid

-

Volume

38

Article Issue

No 2

Related Issue

16739

Issue Date

2010-03-01

Receive Date

2009-11-08

Publish Date

2010-03-01

Page Start

323

Page End

342

Print ISSN

1687-0530

Online ISSN

2356-8550

Article File

JESAUN_Volume 38_Issue No 2_Pages 323-342.pdf

PDF . 795.2kB

Link

https://jesaun.journals.ekb.eg/article_124369.html

Detail API

https://jesaun.journals.ekb.eg/service?article_code=124369

Order

1

Type

Research Paper

Type Code

1,438

Publication Type

Journal

Publication Title

JES. Journal of Engineering Sciences

Publication Link

https://jesaun.journals.ekb.eg/

MainTitle

ANALYSIS OF TRANSIENT FLOW PHENOMENON IN PRESSURIZED PIPES SYSTEM AND METHODS OF PROTECTION

Details

Type

Article

Created At

23 Jan 2023