Condensate Pot Function and Advantages

Condensate Pot Function and Advantages
Condensate Pot Function and Advantages

Condensate Pot Function and Advantages

Condensate pots find its use largely in steam applications but they can be used for any vapour system which has the potential to get condensed during the process or if the vapour is saturated with liquid.

Condensate pots are used to aid the differential pressure flow measurement device so that the accuracy of the readings does not decrease.

A flow measurement device is a combination of the flow measurement set-up, such as the orifice plate set-up and a transmitter; in this case it is a differential pressure transmitter. A line connects both of them which is called as impulse line. There are two impulse lines, one originating from the side of high pressure tapping and the other from the side of low pressure tapping. The steam flows in to the lines from both the sides. The difference of the pressure is used to calculate the flowrate and then the information is transmitted to the control room for monitoring purpose.

The steam used in process industries is often saturated in nature hence it has tendency to increase or decrease the amount of liquid based on if heat is removed or added to the saturated steam respectively. While the steam is moving through the impulse line it may lose heat due to some or the other reason and get condensed and the condensation may be uneven in both the lines. This causes the readings to become erroneous and the differential pressure transmitter transmits the erroneous readings to the control room. The control room personals may assume that nothing is wrong with the readings and according make changes by increasing or decreasing the flow which will affect the processes downline as well. It may take a lot of time for the actual problem to be detected if the values of the variables downline appear faulty.

Condensate pots are installed between the flow measurement set-up and the differential pressure transmitter in order to collect the liquid which gets condensed while the steam is moving through the impulse line. Thus the setup has a column of water and then steam which exerts pressure on the water. In order to ensure the readings are not erroneous, both the condensate pots need to be installed at the same level and the level of the liquids in both the pots should be same. If the level of liquid in one of the pot is higher than the other then this additional weight of water will introduce an error in the readings and the differential pressure transmitter will transmit the erroneous readings to the control room.

The condensate is drained from the bottom valve connection.

Additional Advantages

  • The condensate pots are able to trap any foreign material and prevent them from reaching the sensitive instrumentation component. Thus they are saved from getting damaged.
  • If a sudden increase in temperature is made in the steam then it may cause some liquid inside the condensate pots to get flashed, if no liquid level was maintained inside the condenser pots then it would result in highly erroneous readings.

Some Installation Tips

  • Keep the length of impulse lines as short as possible.
  • Insulate the impulse lines so that they don’t lose heat.
  • Add an anti-freeze agent in the set-up so that liquid does not freeze.
  • Install a blowdown mechanism between the condensate pots and the differential pressure transmitter so that inert material does not accumulate.

Reference:- instrumentationtools, automationforum, as-schneider

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