How to check if the lining of a synthesis tower is leaking
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How to check whether the lining of the urea synthesis tower is leaking
Nitrogen is introduced through the leak detection hole, and phenolphthalein reagent is used at the outlet for testing; if it turns red, it indicates that an alkaline substance, namely ammonia, has entered, suggesting a leak. This post was last edited by lxq700918 on 2009-3-8 22:24.]
Ammonia penetration method, with phenolphthalein detection.
It is determined by the level of conductivity of the steam introduced through the leak detection holes
Ammonia leakage can be detected intuitively, as well as helium testing; nitrogen or air can also be used for leak detection. The pressure should be increased gradually, but not too much, to avoid deformation of the lining
We usually conduct ammonia leakage tests; may I ask how helium testing is carried out, including the medium, pressure, and testing principle? The pressure for ammonia leakage should be kept below 0.5 kgf/cm2; it must not be higher. Some require vacuum replacement, but it’s troublesome; we’ve never done this before.
When using a synthesis tower, whether for steam leak detection or nitrogen or air leak detection, phenolphthalein test strips are quite effective; they have high sensitivity and enable timely and accurate determination of whether there is a leak. It is best to use helium testing to shut down the synthesis tower. Ammonia leakage repair is no longer recommended nowadays.
First, it is necessary to determine accurately whether there is a leak in the lining; second, an appropriate testing method should be chosen based on the actual situation; third, an authoritative testing institution should be selected.
For manufacturing and tower shutdown inspections, helium testing is the best option; there are fewer ammonia leaks, and helium testing has high sensitivity. It’s best to consult the manufacturer of the urea tower for specific details
**There is a document stating that steam cannot be used for leak detection; nitrogen and air should be used instead