Can internal floating roof tank reviews be carried out frequently?
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According to the regulations set by the petrochemical industry and the State Administration of Work Safety, it is prohibited to lower internal floating roof tanks to the ground. What is the purpose of this? The goods stored in the floating-roof tanks in the tank farm where I work belong to customers. Every time they need to load the goods onto ships, they request that the tanks be emptied. In practice, the floating roof is lowered each time; the substances stored in these tanks are naphtha, aromatics, and similar materials. Which teacher can explain in detail why it is stipulated that the floating pad must not touch the ground?
Frequent landing can cause damage to the buoy and leakage of the sealing rings
**Order No. 84 issued by the General Administration of Work Safety: “Ten Provisions on Fire and Explosion Prevention in Oil and Gas Storage Areas”, SHT 3007-2014 – “Design Code for Storage Areas in Petrochemical Storage and Transportation Systems”. Internal floating roofs are installed on storage tanks usually because the materials stored there are prone to volatilization. When the liquid level in the storage tank drops below the floating disk, a large amount of gas exists between the liquid level and the floating disk. During feeding, this gas is released, which can easily result in the formation of an explosive gas mixture ； During discharge, since the floating disk can no longer move downward, liquid is drawn in, creating a negative pressure above the liquid level in the tank and damaging it. A typical accident case can be referred to as the diesel storage tank explosion incident at Dalian Petrochemical on August 29, 2011.
This post was last edited by 68589544 on 2019-7-6 22:20. Dangers of floating trays: 1. Without a nitrogen seal, air will enter beneath the floating tray, creating an explosive gas mixture； 2. Frequent crashes can damage the seal ； 3. Frequent disk drops pose a risk of the floating disk getting stuck.
Well, the floating tanks in use now all have gas spaces; would using fully liquid-filled floating discs yield better results?
It turns out to be a internal floating roof tank; once it settles to the bottom, the material beneath the floating roof is no longer covered by it, which is equivalent to a fixed tank, and the floating roof can no longer provide any protection
The floating disc must not land frequently; there are regulations prohibiting it from operating at low liquid levels, as this is extremely dangerous. How large is the floating platform? What form? If necessary, it can be designed with adjustable legs, with an operating height of around 1 meter being sufficient.