Surge tank

Surge tank

Surge tank is one of the most important equipments in water transmission lines, oil and pumping systems that tries to minimize the effects of reducing or increasing the pressure in the pressurized pipelines and preventing the phenomenon of ram shock. In other words, the surge tank is pressurized along the fluid transmission lines to act as a storage tank in the event of increased pressure and to act as a reservoir and power supply by reducing the pressure. Seven Industrial Group is a manufacturer of surge tanks and various types of pressure vessels, which offers the design, production and construction of shock tanks in compliance with various standards. The price of surge tank, its types and important points and standards in the design, production and manufacture of surge tank will be described below.

What is Surge Tank?

Increasing or decreasing the pressure in pipelines transporting water, oil, etc. in which the fluid is flowing under pressure causes sudden waves which are known as ram shock. The occurrence of the ram impact phenomenon depends on various factors, such as changes in flow rate, pressure and fluid transfer rate. Due to the serious dangers and damages that the phenomenon of ram impact to the body of pipes and fluid transfer facilities creates, by placing a tank surge or shock absorber tank, an attempt is made to eliminate this phenomenon.

Surge tank is a metal tank with a very strong body that is installed in the pipelines under pressure in the path of liquid transfer and absorbs part of the fluid by increasing the pressure in the pipe. In other words, it acts as a storage tank by increasing the pipe pressure. In contrast, by reducing the pressure in the pipes too much and preventing the phenomenon of water separation from the column, part of the fluid in the surge tank is transferred into the pipelines and actually acts as a power supply. In the general structure of these tanks, air will be at the top of the tank and water at the bottom.

Shock absorber tank

Types of surge tanks

According to the pressure in the pipelines and other factors in general, one of the two types of surge tanks can be selected to control and adjust the pressure inside the transmission lines, which are:

One-way surge tank

One-way surge tank acts as a power supply by being in the path of pipelines. This type of surge tank actually injects part of the fluid that has already been stored in the tank into the fluid transfer path by reducing the pressure in the pipelines. This prevents the phenomenon of fluid separation from the column and the impact of the ram, which eventually leads to cracks in the pipes and installations. This tank is installed above the level of the transmission lines and its maintenance cost is relatively high due to its long distance to the pumping station.

Two-Way Surge tank

As the name implies, this type of surge tank can play the role of power supply and storage due to the conditions inside the transmission pipes. In other words, by increasing the pressure in the transmission lines and in order to prevent the occurrence of rams, part of the fluid is transferred into the tank. As the line pressure decreases, it will act as a one-way type and part of the fluid in the tank will be injected into the pipeline. As fluid enters or leaves the tank or pipeline, the internal air in the tank will contract and expand, and the effect of increasing or decreasing the pressure will be reasonably reduced.

In another category and according to the method of installation of these tanks, they can be divided into groups: Free standing surge tank, horizontal and oblique surge tank. As is clear from the name of each group, in the standing type, the tank is installed vertically in the path of water or oil transmission lines, and due to its strengths, it is used more than the other two types. The oblique type of these tanks has limitations in terms of how to fix it and prevent movement and shaking, and finally in horizontal surge tanks we will face the problem and limitation of increasing the volume of space without using water. Of course, it should be noted that according to the environmental conditions in which the tank is installed and the positive and negative characteristics of each type of tank, the appropriate option is selected.

Design and construction of tank surge

Surge tank design

Due to the great importance of surge tanks and their positive effect in preventing the bursting of pipes due to the phenomenon of ram impact, it is necessary to consider several standards in the design of surge tanks. One of the most important points to consider in designing a surge tank is the following options:

·        All designs and calculations are performed to determine the size, dimensions and other factors of the Surge tank according to the ASME standard. ASME is the standard of the American Society of Mechanical Engineers, which all designers and engineers are required to follow in all design processes of various types of surge tanks, etc.

·        The size of the tank and the ratio of air and water in it are determined according to the type of fluid, the amount of pressure in the pipelines, etc.

·        The material used for the tank body, its installation method (horizontal, vertical and oblique) is determined according to the environmental conditions and the pressure in the pipelines. According to the ASME standard, steel sheets are used for most surge tanks to have good impact and pressure resistance.

·        In order to increase the strength of the tank against chemicals and prevent corrosion of the hull, the inner layers of the source are covered with several layers of epoxy.

Construction of Surge Tank

Seven Industrial Group, as a manufacturer of water and wastewater treatment equipment and pressure vessels, has designed and manufactured Surge tanks in various dimensions and sizes in its activities. It should be noted that each of the construction and production projects of Surge tank in this complex is carried out according to the conditions of transmission pipelines and the amount of pressure in them and changes in flow, etc., and is completely unique. Therefore, the experts and engineers of Seven Industrial Group are ready to provide free advice to provide information and introduce each of the features used in the construction of Surge tank.

Price of Surge Tank

As mentioned in the text, tank tanks are different in terms of dimensions, size, body material and thickness of the sheets used in it and the type of installation and other factors. As a result, the price of tank surge is completely variable and is determined based on its various characteristics. To inquire about the price of Surge tank, you can contact Seven Industrial Group through the following communication channels.

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