Steam Terms


Calorie: It is the amount of energy that should be given in order to increase the temperature of one gram of water. 1 calorie = 4.186 J.

Steam: As we all know, there are 3 phases of matter. Water is called ice in its solid state, gas in its gas state and water in its liquid state.

Saturation Temperature: The temperature at the point where the water starts to boil under any pressure (point 2 in Figure 1) is called the saturation temperature.

Evaporation Enthalpy: It is at constant pressure and temperature at 2 points where water starts to boil. The heat that converts from point 2 to point 3 is the vaporization enthalpy (Hidden Heat).

Saturated Steam: (point number 3 in Figure 1) The state where the water is completely in the vapor phase, under any pressure and at the saturation temperature at this pressure, is called saturated steam.

Superheated Steam: If the temperature of the steam under any pressure is above the saturation temperature at that pressure, it is called angry vapor.



Dryness: In the case where the liquid and vapor phase of the water is combined, the ratio of the mass of water vapor in the mixture to the total (water + steam) mass is called the degree of dryness.

Dry Vapor: This is the vapor with an X value of 1 in Figure 1. It is a vapor without water.

Wet Steam: It is a steam with water grains.

Condensate: Steam starts to transfer heat with the surfaces it encounters outside of the boiler and gives a part of its enthalpy. In doing so, it turns into water at the same temperature.

Horn Impact: The first contact of the steam coming from the boiler with the cold air is the piping which is cooler than the steam temperature and used for the transportation of steam. The steam transmits a part of its enthalpy to the installation pipes of lower temperature and turns into condensate (water) at the same temperature. If the water accumulated in the installation is not quickly and correctly evacuated, it will damage the plumbing and other installation elements such as valves and elbows by high speed and noise. This is called the Coach Pulse.

TDS (Total Dissolved Solids): means total dissolved solids. The unit is ppm (part per million, ie the amount of solids per million) or mg / liter. It is one of the parameters showing the ion and mineral richness of waters. The more water is soluble in the water (ie the greater the amount of TDS), the greater the conductivity.

Blowdown: The feed water from the boiler contains many dissolved substances (such as salt, lime and iron) and solid suspensions. TDS, whose density increases or hangs as the feed water is evaporated in the boiler, causes considerable inefficiency in the boiler over time. In order to remove these unwanted substances from the boiler to the limits determined in the boiler, a part of the boiler water and the undesired substances are removed from the system is called blowdown.

Bottom Blowdown: The process of dissolving the sediments from the bottom of the boiler together with the boiler water. After this process, water must be added to the boiler. Level indicators are important.