Why does steam flow fluctuate?
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Our factory uses an orifice plate differential pressure flowmeter to measure steam. Why does it fluctuate? Especially on rainy days, fluctuations occur more frequently, all caused by the fluctuation of the meter measuring steam. I asked the old factory if their steam flow meters would fluctuate. They said that it rarely happens. Unless there is a leak in the pressure pipe, fluctuations will not occur easily. Combined with the actual situation of our factory, the operating pressure and temperature of the inquiry process are very stable. Draining a small amount of condensate every time you go to check the drain will not have any effect. You have to drain it all and wait for another 20 minutes before putting it into use. I noticed several phenomena during the discharge process:: First, some steam will be slightly polluted. ； Second, some may have a small amount of foamy liquid discharged. ； Third, some discharges will occur one after another. Could it be the fluctuation caused by sewage or accumulated gas? But why do other factories rarely fluctuate when measuring steam? Let me ask again, has your factory insulated the pressure guiding tubes and packets for measuring steam?
1. Check the position of your pressure port, it is best to be a little bit on the horizontal line. 2. When adding water to the condensation tank before operation, open the lower transmitter drain port first, wait for water to flow for a while, and then close it. 3. Check your piping. It is best to run vertically under the orifice plate. If it runs horizontally, it must have a larger slope. 4. If the lowest temperature in your place in winter is not lower than 0 degrees, there is no need to insulate.
The pressure taking method and piping are all qualified and the work was done in accordance with the specifications. Now there are fluctuations, which is really puzzling. The fluctuating curve is the kind with a very high frequency, in the shape of a sharp wave, with a peak-to-peak difference of several tons. From time to time, I was asked by the operator to calibrate the watch, which gave me a headache.
Is it because the differential pressure measured on site itself fluctuates?
This post was last edited by ddfly on 2010-6-15 14:21 If you have constant fluctuations on rainy days, check the position of your condensation tank. Have you tried changing the transmitter? Take some photos and post them, and they will analyze them for you.
If the pressure guide pipe is long or the installation method is unreasonable, a similar situation will occur. It is best to change to a vortex flowmeter with voltage stabilization compensation.
Is your flow meter installed in the open air? Or is it raining on the pressure pipe? !
I personally think that the appearance of the gas-liquid two-phase in the condenser tube is not constant, but a relatively constant state, which means that the gas-water conversion reaches equilibrium at the junction of the two phases. When the weather changes drastically, especially when it rains and rainwater falls on the condenser tube, the result is that the gas condenses more, and the steam itself requires Temperature and pressure compensation is required. Generally, the measurement of steam is rough and does not require temperature and pressure compensation. When the weather changes, the state of the steam also changes, so it keeps fluctuating. In winter, the use of heat tracing will also cause fluctuations. There are two situations: one is that the heat is not good for a while, resulting in liquid accumulation and affecting pressure transmission; the other is that the heat trace is too hot, causing water to evaporate too quickly.
Are your on-site environment and installation conditions the same as those of other manufacturers you mentioned? ? , it must be different, so you have to judge based on the actual situation, whether the condenser is at the same level, whether the working pressure and temperature fluctuate greatly, whether the pipes are exposed to the open air and whether insulation measures are taken, and whether the transmitter has a protective box.
All the watches in the venue were inappropriate. It couldn’t be electromagnetic interference. Besides, it was raining. How could it have anything to do with heat tracing? ? ? I can’t tell you exactly! Experts please continue! ! ! ! ! ! ! ! ! !