What measures should be taken in case of a low-pressure ammonia leak?
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There are multiple leaks in the low-pressure ammonia pipeline, and the situation is worsening. I want to stop the low-pressure ammonia pump for a while – what are some good ways to prevent the gas collection pipe from being damaged? The coke oven features 4.3-meter ramming, and its roof is equipped with a high-pressure ammonia spray system; each high-pressure ammonia pump has a capacity of 140 m3 per hour. The end of the gas collection pipe is also connected to a fire protection water pipeline with a DN150 diameter. Please have an experienced technician take a look and suggest a way to shut down the low-pressure ammonia pipeline for welding It would be best to have experience dealing with similar issues, thank you!
It depends on how long the shutdown lasts – whether the ammonia storage tank can accommodate a prolonged storage period. During a shutdown, ammonia cannot be supplied to the coke ovens, and the processing capacity of the ammonia vaporization tower is limited; otherwise, the excess ammonia cannot be dealt with. Furthermore, coke ovens should not be operated with industrial water for long periods, as it easily causes scaling and blockages. The industrial water for coke ovens can only be used in emergency situations, or rather, in case of accidents.
First, lay a new pipe (a seamless pipe). Once the new pipe is in place, stop the low-pressure ammonia pump; the coke oven will then be cooled using emergency water. Assign personnel to connect the two ends, and after that, use the new pipeline. This way, the downtime is minimized.
In the event of an ammonia leak, it can only be contained by spraying water
A new pipeline is laid to the coke oven; then, drilling is carried out under pressure behind the low-pressure ammonia branch valve of the coke oven for connection. After it is put into use, a blind flange is installed in front of the original branch valve, and the original pipeline is discarded.
I agree with the opinions from the 3rd and 5th floors; we do the same thing. There’s no better way, so we just need to make up our minds and do it. It won’t earn that much money, but the earlier we start, the sooner we’ll see benefits.
For those who do not want to replace the pipes and whose leaks occur mainly at the welds, clamps can be applied to each weld; it’s just a bit more troublesome.
Circulate and spray using high-pressure ammonia pipelines for maintenance of low-pressure pipelines