Problems with the use of chlorine gas
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I would like to ask everyone for advice. The company currently has a set of chlorine injection equipment, which was supplied as a turnkey package. Recently, the company invited a few people from nearby chlorine-producing enterprises; we went to the site to take a look and raised several questions. We have also raised these issues with the contracting party, and they assured us that there will be no problems. The questions raised were: 1. The gasket issue – the lead gaskets used by the contracting party, while the chlorine production company stated that tetrafluoroethylene gaskets should be used ； 2. Pipeline material: The contractor used ordinary seamless steel pipes made of 20# steel, while the chlorine production company stated that 16Mn material was required. 3. Chlorine leakage recovery system: It is said that when an alkaline solution reacts with chlorine, a large amount of heat is generated, resulting in the formation of sodium hypochlorite; when sodium hypochlorite decomposes due to heat, chlorine is produced again. Lack of cooling equipment. I would like to ask fellow sailors who use chlorine for guidance.
We also use chlorine here; the pipeline design institute specified a strength of 16MN, mainly for liquid chlorine pipelines. Previously, the process pipelines for gaseous chlorine were made of 20# carbon steel. The gaskets are PTFE gaskets; the design institute specified wire gaskets with an inner ring, but the installation company did not perform a good job in terms of sealing, so all of them were replaced with PTFE gaskets! The chlorine leak is due to the absence of an absorption tower and an absorption alkali tank, as well as no cooling system in place. The thermal decomposition of that sodium hypochlorite occurs easily under conditions of low alkali content! When dealing with exhaust gas absorption, you must ensure that there is an excess of alkali! To control the pH value!
Hello, first of all thank you for your guidance; the information you provided is very important to me. Could I get your QQ number? I can ask you questions anytime if I have anything I don’t understand.
1. Gasket issues 2. Pipeline material 3. Chlorine leak recovery system——Follow the instructions given by personnel from chlor-alkali plants; these are all based on accumulated experience
The gaskets must be replaced. Our pipelines are all 16MN grade. As for the recovery tower, it is recommended that you install a cooler; otherwise, there will be emissions
Using lead gaskets is not a good option; the corrosive effect of small amounts of chlorine in the presence of moisture must be taken into account…. Seamless steel pipes of type 20 should work fine – we have been using them all along…. For chlorine absorption devices used in case of accidents, it is necessary to consider cooling the absorption liquid, but many manufacturers do not have the appropriate equipment for this purpose; such devices can only handle small amounts of chlorine leakage, and they certainly won’t suffice in cases of larger leaks. It seems like these devices are only a makeshift solution. :)
Okay, thank you. We are considering it carefully.
Well, okay, thank you. It’s a bit difficult to reach the upper cooler; it’s quite far from the cooling water system.
Normally, up to three steel cylinders can be stored inside our chlorine storage area; in most cases, it’s 2 cylinders at most. The total weight is around 2000 KG. As per the contractor, the chlorine recovery system is designed to handle the amount contained in one cylinder, which is 1000 KG.
The material used is 16Mn, and the gaskets are PTFE gaskets. There is a problem with the lead gasket: severe vibrations can cause chlorine leakage