Chemical complex
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The actual situation is as follows: there are two units within the production facility area, but between these two units there is a tank area containing six tanks. Only one of these tanks is used for storing the product, that is, the raw material for the downstream units, and its capacity is 200 cubic meters. The advantage of this is that when the upstream unit stops operating, the downstream units can purchase raw materials and store them in tanks to continue operating without having to shut down. Can such two devices also be called combined devices?
According to the definition of a \"combined unit\" in Article 2.0.11 of the Code for Fire Protection Design of Petrochemical Enterprises GB50160-2008 (2018 edition), such a unit is one that is arranged in a compact manner, with direct feeding between the various units; it lacks intermediate raw material storage tanks for maintenance purposes, and its operation or shutdown for maintenance is carried out simultaneously, making it considered as a single unit. According to the definition, a combined device is characterized by the fact that it operates and stops simultaneously; I believe what you are describing is not a combined device.
This post was last edited by bfdlwolf on 2019-5-13 at 14:57. It can be considered as a single device, with the original two devices being regarded as its two units. In facilities such as the ethylbenzene-styrene plant, it is divided into an ethylbenzene unit and a styrene unit. The raw materials for the ethylbenzene unit are catalytic dry gas and benzene; the ethylbenzene produced in this unit serves as a raw material for the styrene unit. When the ethylbenzene unit is not in operation, ethylbenzene can be purchased externally to produce styrene.
When it was designed, the design institute planned it as a combined unit in order to avoid the limitations posed by insufficient safety distances.
Designing a combined unit is also a viable option; it mainly depends on whether the expert review can be passed and whether any issues will be raised by the experts. Strictly speaking, this should not be classified as a combined unit.
I also think it shouldn’t be called a combined device.
Strictly speaking, by definition, it is not a combined device. It was designed based on actual practical applications. Experts have explained that it is not a combined device. Because they do not start and stop simultaneously, and since purchased products can also be used in production, there are a large number of storage tanks.
I’ve only been working with styrene for a year; are there any posts with knowledge on this topic?