It is very important for steam traps to remove air, keep in mind!


The main purpose of steam traps is to remove condensate, however, steam traps must also have the ability to remove air.Therefore, to explain why the air must be excluded when the air is mixed with the steam to use the equipment, Baivalve.com will show you here, and I hope it will be of some help to you.

①Prevent corrosive steam inside the equipment

If air is mixed into the equipment, as mentioned above, the condensed water and the oxygen in the air will react chemically, causing corrosion of iron, which is dangerous and uneconomical, so the steam trap must be excluded.

②Prevent the reduction of the operating efficiency of steam-using equipment

The latent heat of the steam in the equipment heats the object to be heated, and the steam cools and condenses into water, forming a condensed water layer around the pipe wall (see Figure a). However, if the air is withdrawn from the inside of the equipment, since the air is a non-condensable gas (that is, it cannot be liquefied), an air layer is formed on the inside of the condensed water layer on the inner pipe wall of the equipment (see Figure b), and the thermal conductivity of the air is extremely high. It is smaller than the heat insulating material, thus significantly reducing the heat exchange capacity between the steam and the object to be heated.

As mentioned above, air is mixed in the steam using equipment. When it is not completely eliminated, the steam trap itself will have “air blockage” and other failures to be mentioned later, such as:

①Oxygen in the air corrodes the inside of the equipment.

②The air layer formed on the heat transfer surface reduces the heat transfer efficiency. The reduction of the steam partial pressure causes the reduction of the steam temperature, which in turn reduces the operation efficiency, which brings great harm to the steam equipment. Therefore, it is very necessary to prevent air from entering the interior of the equipment. If air is mixed, it must be eliminated.

The steam trap can not only remove the condensed water, but also should be able to remove the air, that is, it must have the function of exhaust. To avoid air-induced failures, the venting capability provided by steam traps is only an aid. Therefore, as a method of removing a large amount of air, an open elbow or a manual air discharge valve, an automatic air discharge valve and a steam trap are used together.

①Prevent corrosive steam inside the equipment
If air is mixed into the equipment, as mentioned above, the condensed water and the oxygen in the air will react chemically, causing corrosion of iron, which is dangerous and uneconomical, so the steam trap must be excluded.
②Prevent the reduction of the operating efficiency of steam-using equipment
The latent heat of the steam in the equipment heats the object to be heated, and the steam cools and condenses into water, forming a condensed water layer around the pipe wall (see Figure a). However, if the air is withdrawn from the inside of the equipment, since the air is a non-condensable gas (that is, it cannot be liquefied), an air layer is formed on the inside of the condensed water layer on the inner pipe wall of the equipment (see Figure b), and the thermal conductivity of the air is extremely high. It is smaller than the heat insulating material, thus significantly reducing the heat exchange capacity between the steam and the object to be heated.

As mentioned above, air is mixed in the steam using equipment. When it is not completely eliminated, the steam trap itself will have “air blockage” and other failures to be mentioned later, such as:
①Oxygen in the air corrodes the inside of the equipment.
②The air layer formed on the heat transfer surface reduces the heat transfer efficiency. The reduction of the steam partial pressure causes the reduction of the steam temperature, which in turn reduces the operation efficiency, which brings great harm to the steam equipment. Therefore, it is very necessary to prevent air from entering the interior of the equipment. If air is mixed, it must be eliminated.
The steam trap can not only remove the condensed water, but also should be able to remove the air, that is, it must have the function of exhaust. To avoid air-induced failures, the venting capability provided by steam traps is only an aid. Therefore, as a method of removing a large amount of air, an open elbow or a manual air discharge valve, an automatic air discharge valve and a steam trap are used together.

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