Is the condensate drained from low-pressure steam at 0.88 Mpa (DN125) considered a pressure pipeline?
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Steam pressure: 0.88 Mpa. After entering the equipment, the steam condensate that is released as a result of water separation is handled through pipes with a DN125 diameter. The design institute classified these pipes as GC2, but according to the definitions related to pressure pipes, pipes with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 Mpa are not considered pressure pipes, unless they are used to transport non-toxic and harmless gases. I am very confused by this, so I would be extremely grateful if someone from HaiChuan could help clarify this for me
It is a pressure pipeline. Steam and steam condensate cannot be simply classified under the definition of pressure pipelines.
The steam condensate pipeline mentioned by the poster, with a pressure of 0.88 MPa, meets the criteria for pressure pipelines (pressure, temperature, diameter), and should be classified as a GC2 category pressure pipeline. Neither steam condensate nor steam medium falls under the category of non-toxic and harmless gases as specified by the exceptions.
Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipelines with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, carrying gases, liquefied gases, steam, or liquids that are flammable, explosive, toxic, corrosive, and have a maximum operating temperature equal to or higher than their standard boiling point, and with a nominal diameter of 50 mm or more. Steam is mentioned here; it applies to those with a diameter of DN50 or more
The key point mentioned on the 4th floor is whether the medium being transported reaches its standard boiling point. From this perspective, since condensate water does not reach its boiling point, it should be classified as a non-pressure pipeline. You can check the Regulations on Safety Inspections for Special Equipment; there should be definitions related to this in there
Steam at 0.88 MPa enters the heating equipment, but the condensed water that flows out should not reach 100 degrees Celsius; in other words, it does not reach the boiling point at atmospheric pressure, let alone at the pressure under which it is transported. It should not fall within the scope of pressure pipelines
Steam at 0.88 MPa, steam condensate 175.43℃
I only know that for steam at 0.88 Mpa, the corresponding temperature is 179°C. Could you please tell me how the condensate temperature is calculated, as well as what the corresponding pressure is? I would appreciate your guidance!
Unless supercooling is specifically indicated, the temperature of steam condensate is generally taken as the saturation temperature at the corresponding pressure； The pressure is determined by the set pressure of the condensate recovery system.