[Activity 06] Discussion thread on whether fire dikes should be added to sulfur-containing sewage tanks
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This post was last edited by eleg on 2009-8-31 10:35 Dear friends, the Fire Protection Design Code for Petrochemical Enterprises 6.2.11: The tank group should be equipped with fire dikes. How do you understand this tank group? Does it refer to oil and liquefied hydrocarbon storage tanks (combustible liquid above-ground storage tanks)? Should sulfur-containing sewage tanks used to store sulfur-containing sewage in general refineries be equipped with fire dikes? If so, what specifications should be followed for design? Please reply, thank you! ! ! In fact, when asking this question, I purely consider it from the perspective of environmental protection, but such issues are inseparable from safety. In fact, this issue can be further discussed. For example, chemical companies generally involve chemical storage issues, such as acids, alkalis, chemical solvents, etc. Once such storage tanks leak a large amount of chemicals, how to collect and handle them is also a problem. Should these storage tanks be added with fire dikes for collection and storage? If so, what design specifications should be referred to? ? ?
I don’t know much about it, but I think it should not be designed according to fire protection regulations, but should be handled according to dangerous goods design regulations. Alkali and concentrated sulfuric acid are not necessarily easy to catch fire, and serious problems will occur if they come into contact with water. Fire protection should be for flammable and explosive substances, such as oil, other flammable gases, etc. It’s not necessarily accurate, I’m just speaking based on my feelings. I hope you’ll forgive me!
Our sulfur-containing sewage tank has just been added. The sulfur-containing sewage is very toxic. Once it leaks, it will endanger the lives of employees and even make them unable to escape. Based on this alone, it must be added, regardless of whether the regulations stipulate it or not.
Ask the guy upstairs (hehe, I know who you are, but I won’t tell you): How do you consider the volume of fire embankments? Is it an oil tank? ? ? Is it the maximum volume of a single tank in the tank group? ? ? In addition, this thing should not be added too high, otherwise it will easily cause hydrogen sulfide to accumulate in the fire dike (if the ventilation is not good). Hey, can you give me some suggestions? ! ! In fact, I am a little scared if this thing leaks in large quantities. After all, the hydrogen sulfide content is very high, so prevention is the first priority, haha! ! !
Answer the host’s questions in order: 1. Tank group: According to the "Petrochemical Fire Protection Design Code" GB50160-2008 2.0.24 A group of storage tanks is one or more storage tanks arranged in a fire dike. (explain: In addition to what you said, it also includes acid, alkali and other hazardous material storage tanks) 6.2.11 The tank group should be equipped with fire dikes. 2. Generally set up in refineries. 3. If designing, refer to the design requirements for acid and alkali storage tanks in the "Design Code for Fire Protection Dike in Storage Tank Areas" (GB50351-2005).
Replenish: According to the "Code for Fire Protection Design of Buildings" GB50016-2006 4.2.6 semi-open storage yards for Class A liquids, barrel storage yards for Class B and C liquids, and liquid storage tanks (areas) with a flash point greater than 120°C, when facilities are adopted to prevent liquids from flowing away, fire dikes are not required. If the space is limited, it may not be set according to this article. Therefore, the situation mentioned by the poster should be analyzed in detail and based on the principle of seeking truth from facts to decide whether to set it up.
This post was last edited by jingsan on 2009-8-31 14:09. What the poster mentioned should be the sulfur-containing sewage storage tank in the acid water gas stripping section or the sulfur-containing sewage storage tank in sewage treatment. Although there is no standard requirement for this type of storage tank to be equipped with a leak-proof dike, it is better to set it up as long as conditions permit. The key is to have effective liquid diversion facilities. If there are no effective liquid diversion facilities, even if the leaked sulfur-containing sewage remains in the anti-leak dike, it will easily cause poisoning of surrounding workers. For the basis for setting up dikes for acid and alkali (or other corrosive media) storage tanks, please refer to the relevant provisions of the "Anti-Corrosion Design Code for Industrial Buildings": Article 3.2.2: Large equipment that produces or stores corrosive solutions should be placed outdoors and should not be adjacent to the foundation of the factory building. Enclosures should be set up around storage tanks and tanks, and embankments should be set up around acid storage tanks and acid storage tanks.
Too late! The person above said a lot. 4# is talking about old tanks and fire embankments! If there is not enough space to add a fire dike, it will be very high, but it will feel unsafe if it is not added. Once a leak occurs, the operation room will be endangered. We adopted the method of lowering the height of the cofferdam and did not handle it according to the standards of fire embankments. After all, the biggest fear of sulfur-containing sewage tanks is that sulfur-containing sewage will spread over a large area and cause poisoning of people.
Moderator Xiaowei on the sixth floor, you accept. First of all, thank you for your answer, but I don’t understand the following sentence. For liquid storage tanks (areas) with a flash point greater than 120°C, when facilities are adopted to prevent liquid dispersion, fire dikes are not required. What does "when facilities are adopted to prevent liquids from dispersing" mean? What does this facility generally refer to? ? ? Cofferdam? ? ?
This post was last edited by hkj0221 at 2009-9-1 13:16 "Fire Protection Design Code for Petrochemical Enterprises" Section 6.2.11 Tank groups should be equipped with fire embankments. The relevant provisions are explained below: Once an above-ground flammable liquid storage tank ruptures, the flammable liquid will flow out of the tank. If there is no fire dike, the outflowing liquid will spread. In order to avoid such accidents, it is stipulated that the tank group should be equipped with fire embankments. Should fire dikes be installed in sulfur-containing sewage tanks used to store sulfur-containing sewage in general refineries? It should be set up, but the name should not be called a fire embankment, it can be called an embankment. Like a fire embankment, it is a facility to prevent liquids from flowing away, but the requirements are not as strict as a fire embankment. If you really want to find the specification, you can refer to Article 3.2.2 of the "Code for Anti-Corrosion Design of Industrial Buildings" "Large-scale equipment that produces or stores corrosive solutions should be arranged outdoors and should not be adjacent to the factory building foundation. Enclosures should be set up around storage tanks and tanks, and embankments should be set up around acid storage tanks and acid storage tanks. ”. Relevant provisions explain that “the establishment of dikes is a measure to prevent secondary disasters in the event of sudden large amounts of corrosive liquid leakage accidents. The dike does not need to use corrosion-resistant materials, but it must be able to prevent a large amount of solution from being lost in a short period of time, and recovery measures can be taken in a timely manner. ”
Haha, I think if you are non-combustible, you don’t have to make a fire embankment. Of course it would be better. Generally, it is enough to make an emergency sewer and use a diversion ditch to centrally treat the leaked wastewater. If it contains hydrogen sulfide, just set a toxic gas alarm next to the storage tank.