Numerical analysis of operating conditions of the transmission pipeline in transient states
author:
KONRAD BABUL
ORCID ID:
0000-0003-2719-3247
No:
11/2020 Instal p. 30-35
DOI:
10.36119/15.2020.11.4
Numerical fluid flow simulations, which enable to model the real and transient operating conditions of large-scale
industrial installations, make it possible to conduct process risk analysis (HAZOP), multi-variant parametrical economic and technological optimization, as well as selection of the most favorable variant for investment at the
design stage. One of the elements of this type of analysis, which are performed for large volumetric flow rates of
liquids through long technological and transmission pipelines, may be the selection of appropriate valve closing
times, which as a result of risk minimizing associated with the phenomenon of water hammer, will contribute to the
use of a lower pressure class of pipelines or avoid the need to install of surge tanks.
The article presents analysis of operating conditions of the hydraulic system with a process water transmission
pipeline. The subject for numerical verification was the procedure, which includes closure of valves and switching off
of the pumping system. The change of operating parameters and geometrical characteristics of the hydraulic system
were the source of transients flow of water in the transmission pipeline. Based on the numerical simulations we
demonstrated hazards related to the possibility of the phenomenon of water hammer, which lead to sudden increases and drops in pressure in the hydraulic system. The negative influence of backflows inside the transmission pipeline were effectively limited, based on the presented procedure of the valve closing time setting. Verification of
operating conditions of the hydraulic system was carried out on the basis of the determined course of static pressure
changes in the pipeline and specified limit values of this pressure, which should not be exceeded in analyzed
operating conditions of the system.
Keywords:
About Authors:
dr inż. Konrad Babul – https://orcid.org/0000-0003-2719-3247, Katedra Technologii Energetycznych, Turbin i Modelowania Procesów
Cieplno-Przepływowych, Wydział Mechaniczno-Energetyczny, Politechnika Wrocławska, Corresponding author: konrad.babul@pwr.edu.pl