Hydrodynamic Simulations Of Vacuum-Driven Storage Tanks

As a result of urbanization, stormwater runoff flow rates and volumes are significantly increased due to increasing impervious land cover and the decreased availability of depression storage. Storage tanks are the basic devices to efficiently control the flow rate in drainage systems during wet weather. Presented in the paper conception of vacuum-driven detention tanks allows to increase the storage capacity by usage of space above the free surface water elevation at the inlet channel. Partial vacuum storage makes possible to gain cost savings by reduction of both the horizontal area of the detention tank and necessary depth of foundations. Simulation model of vacuum-driven storage tank has been developed to estimate potential profits of its application in urban drainage system. Although SWMM5 has no direct options for vacuum tanks an existing functions (i.e. control rules) have been used to reflect its operation phases. Rainfall data used in simulations were recorded at raingage in Czestochowa during years 2010÷2012 with time interval of 10minutes. Simulation results gives overview to practical operation and maintenance cost (energy demand) of vacuum driven storage tanks depending of the ratio: vacuum-driven volume to total storage capacity. The following conclusion can be drawn from this investigations: vacuum-driven storage tanks are characterized by uncomplicated construction and control systems, thus can be applied in newly developed as well as in the existing urban drainage systems. the application of vacuum in underground detention facilities makes possible to increase of the storage capacity of existing reservoirs by usage the space above the maximum depth. Possible increase of storage capacity can achieve even a few dozen percent at relatively low investment costs. vacuum driven storage tanks can be included in existing simulation software (i.e. SWMM) using options intended for pumping stations (including control and action rules ).

Analysis of the accumulated energy by thermal stratification of liquid inside storage tanks with porous layers

A mathematical model was developed in order to study the behavior of thermal stratification of liquid in a typical storage tank with porous medium. The model employs a transient stream function-vorticity formulation to predict the development of stream function and temperature fields in a charging process. Parameters analyzed include Biot, Darcy, Reynolds and Richardson numbers, position, and the thickness of the porous medium. The results show the influence of these physical parameters that should be considered for a good design of storage tanks with thermal stratification.

Models of liquid storage tanks

We present the results of a comparative study on thermally stratified tanks for hot storage. A two-dimensional model is employed. A numerical solution was obtained using the control-volume technique due to Patankar. The two-dimensional model was simplified for the pure conduction case. Results from the two models were compared with each other and with available numerical and experimental results. (C) 1997 Elsevier B.V. Ltd.

State-of-the-art procedures and equipment for internal inspection of underground storage tanks /

Mode of access: Internet.

Volumetric leak detection in large underground storage tanks /

Mode of access: Internet.

More about leaking underground storage tanks : a background booklet for the chemical advisory /

Mode of access: Internet.

An introduction to leaking underground storage tanks in Illinois.

"Fall 1994."

Brownfields properties with underground storage tanks : frequently asked questions.

Information for potential buyers of abandoned commercial properties in Illinois that have underground storage tanks.

Brownfields properties with underground storage tanks: frequently asked questions /

"Sept. '05." -- Cover p. [4].

Leaking underground storage tanks technical advisory : soil and groundwater cleanup objectives for LUST releases subject to 35 IAC Part 731.

"October 1995."

LUST regulations (from Title 35 : Environmental protection; subtitle G: Waste disposal) : leaking underground storage tanks.

"Title 35: Environmental protection, subtitle G: Waste disposal, chapter I: Pollution Control Board, subchapter d: Underground injection control and underground storage tank programs, Part 731, Underground storage tanks, subpart A: Program scope and interim prohibition."--Caption title.

Sampling and cleanup requirements for used oil underground storage tanks.

At head of title: Leaking underground storage tanks.