Pressure Tanks

Pressure Tanks

Pressure tanks are devices pressure control devices that work in irrigation systems connected to pressure booster pumps.
In such irrigation systems, pressure switches turn on the pump automatically to pump water overflow is detected in the source.

Roles of Pressure Tanks

A Pressure tank moderate changes in pressure that can occur in the system due to the frequent start and stop action of the pump. The tank also works as an emergency supply of water to the pipeline for use during times of low water levels in the source.
It is important to use pressure tanks in pump systems to prevent cycling and damage to the pump when water is depleted from the source.

Features of Pressure Tanks

  • Rubber Membrane – holds all types of fluids since it is a non–corrosive material.
  • The rubber inner surface can be replaced any time it gets worn out or damaged.
  • Diaphragm made of Butyl – The butyl material enhances longevity and is resistant to harmful conditions.
  • Air Valve with O-ring – Enhances efficiency and in the end reduces maintenance of the pressure tank.

Working Principle | How they Work

A pressure tank balances water pressure in the supply systems using the principle of compression on air and fluids. Air is more compressible than water thus allowing the increase in size of the diaphragm or rubber membrane into the airspace. The water pressure increases as air gets pressed until it reaches a set limit normally 40 -60 psi. Once it reaches the limit, the pump shuts off automatically.
The use of water in the tank reduces the pressure in the tank and the pumps start upon reaching the preset pressure normally not less than 20 psi.

Types of Pressure Tanks

  1. Diaphragm Pressure Tanks – They have a rubber diaphragm which separates water chamber and air chamber. Water fills the rubber causing it to press air and the pump shuts off.
  2. Bladder Pressure Tanks – Has two air and water chambers separated by a bladder. The bladder inflates when water enters causing the pump to turn off. It also deflates when water is low and triggers the pump to start.
  3. Air over Water Pressure Tanks
    Simple tanks with one chamber containing air and water on it.

How to Select a Pressure Tank Size

  • Consider the flow rate of the pump -Choice of a pressure tank considering the flow rate depends on the type of pressure tank. For each type, the formula is different.
  • For a diaphragm or bladder tank multiply the flow rate by four. Use the same formula for a galvanized steel tank with a wafer.
  • For a galvanized steel tank without a wafer multiply the flow rate by 10 to get the size of the tank.
  • Type of Pump – Pumps such as submersible pumps that use controllers to determine the speed of the pump require smaller pressure tanks. For example, submersible pumps may work with pressure tanks of 1- or 2-gallons size.
  • Volume of your water source – For wells or water sources with low -yields consult your pump supplier for the suitable pump size to use.

Applications of Pressure Tanks in Water

Used in Booster Pumps to balance pressure in the systems.

Domestic water supply systems

Submersible pump systems

Industrial fluid pressure systems


Where to Buy Pressure Tanks

Aqua Hub Kenya
Call 0790719020

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