Already become familiar to many Autonomous water supply system will be a long time uninterrupted to perform its functions only when its structure there is an expansion tank. It is a simple multifunction device is available in different versions. In order to choose the right equipment for your system, you need to accurately represent how it works and to understand the basic types of devices.
Consider the design of the device. Most often it is a closed device of the diaphragm type. Rubber membrane divides the receptacle into two chambers. The first is air, second is water. Once activated the pump begins to pump liquid into the water tank. It fills and compresses air. The amount of air in the tank decreases and the pressure increases. At the moment it reaches the set value, the pump stops.
As soon as the water from the tank is consumed for economic needs, the volume of the air filled chamber increases and the pressure correspondingly falls. To achieve their minimum value, the pump is again started. The cycle is automatically repeated. Operating pressure range chosen by the user configuring the device is extremely simple.
The tank can be equipped with a pressure gauge that allows you to monitor the pressure in the system. The device performs several functions:
— Protects pumping equipment from rapid wear, reducing the frequent on/off of the device.
— Retains a certain amount of water, allowing you to enjoy the water for a short time after a power outage.
— Protects the water pipes from water hammer that may occur in case of contact with air tubing or due to power surges in the mains.
Online there are two types of expansion tanks. The first equipment with a stationary diaphragm, rigidly fixed inside the tank. This greatly simplifies the design of the device and reduces its production. But at the same time rigidly fixed diaphragm has disadvantages. Primarily contained in the water chamber, the liquid in contact with the walls of the tank. This can lead to rapid corrosion of the tank. Despite the fact that the inner surface of the device is covered with a special protective composition, the rust becomes the cause of failure of the device.
Another disadvantage is the inability when you need to replace the membrane. As soon as she gets messed up, the device will need to be replaced.
I must admit that a lifetime of this kind of devices is small. More durable and reliable expansion tanks with replaceable diaphragm. A worn element can be easily changed for a new one through a special flange, which is located on the body of the instrument. A little different everything is oversized devices. Membrane of such tanks is additionally fixed to the rear part of the nipple that must be taken into account when changing aperture.
Best feature tanks with interchangeable membrane is that water is poured inside the rubber diaphragm. Thus, her contact with the walls of the tank is impossible, and that protects them from corrosion. In addition, the water can't get dirty and she is clean. Thus, the service life of membrane tanks of this type much longer, but the cost is higher. Both modifications are produced in horizontal and vertical execution.
The main characteristic of the membrane tank, which determines the choice of device is its volume. On average, it can vary from 20 to 100 l. Main rule: the capacity of the device should be sufficient to meet all household needs of the house owner. Therefore, when determining the volume of the membrane tank must be taken into account the following factors:
— The number of water points. Thus considered to be not only faucets and shower heads, but and water-using appliances such as washing machine or dishwasher.
— The number of tenants, who will use the water.
— The maximum allowable by the manufacturer, the number of starts and stops of the pump in an hour.
— Possibility of simultaneous operation of several water points.
Selecting the desired volume of the membrane tank, you need to consider a few things. The smaller the capacity, the more inside the system will occur pressure surges. In addition, the pumping equipment will be on/off more often than a big tank. Therefore, ceteris paribus is possible to choose the expansion tank of greater volume.
If during the operation revealed that the capacitance is small, it is possible to install an additional tank. No demolition work is not required, a new device is installed next to the existing. After its installation size will be determined as the total volume of both tanks. When buying you should not try to save money, it is better to purchase a quality device from a trustworthy manufacturer.
If the selected model with replaceable diaphragm, you should ask about the cost of consumables. Some are not the most conscientious manufacturers offer them for clearly overpriced, which is very disadvantageous.
Membrane tank is a necessary element of Autonomous water supply. Its installation allows to make the operation of the system of water supply is long, comfortable and uninterrupted. published