Expansion tank for heating : why is it needed ?

What are the expansion tanks?

The very structure of the device is very simple: it is a tank is partially or completely filled with air.Modern factory products usually additionally equipped with a rubber membrane that protects the insides of the heating system from the corrosive action of oxygen, and the pressure relief valve.It should be noted that such improvements are optional, do not occur in all models, as is not always necessary.Read more about what a tank for a system is needed (closed, open), see the article "The expansion tank in the heating system."

How to choose the expansion tank for heating

There are a number of nuances, allowing accurately and instantly determine capacity model that wi fully meet the specific heating system:

• tank volume is one-tenth of the coolant volume in the system, but precisely calculateit is not necessary - the best would be to take a tank with a reserve;
• in membrane models with the pin can be adjusted to the desired air pressure (factory setting equals 1.5 kgf / cm2, and the system generally have to 0.2 kgf / cm higher pressure);
• red tanks are designed for heating, but blue - for the supply of drinking water;in fact the only difference lies in the material of the membrane - in blue rubber food;
• when installing the tank should ask him a position in which water or other heat transfer fluid will be poured on top - so remove most of the air;
• if the safety valve is working too hard, certainly not enough tank volume and cost to install an additional;
• many modern gas and electric boilers already include and expansion vessel and circulation pump - make sure that your do not exist, before installing additional.

Expansion tanks: price

Price simple enough, but very necessary device can vary considerably depending on the built-in functionality, quality of materials used, the volume of the tank.On average, capacity can be purchased from 3-4 up to 11-24 of hundreds of thousands of rubles, but in some cases you can do all the coppers, if you make a tank with his own hands, and not to pick from available in range.

Expansion vessel with their hands

immediately warned that will save only in the case of whether you have an open heating systems where the coolant circulation is carried out in a natural way.

tank Fabrication require at least basic skills of welding work, but in general, the process is simple and will be able to deal with it almost every.

take proper gas or arc welder, 2-3 mm steel sheet, Bulgarian or acetylene torch

1. Cut the sheet metal on the five square or rectangular pieces about 30x30 or 40x30 cm (although it is possible and others, depending on your needs.
2. Preparations need to put under the correct right angle and carefully weld seams

as cover fit everything on the functionality it has no effect, and its main task - to... to protect the container from the trash

Membrane same tank can also be done with his own hands,but this process is clearly nerentabalen.