How to calculate the safe height of spherical tanks with internal floating roofs! ! ! Urgent@@@@@@@@@@@
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Could you help explain how to calculate the safe height of internal floating roof tanks and spherical tanks, as well as how to set the high-level and low-level alarms? Our ethanol floating roof tank has a total height of 11.9 m and a diameter of 11.5 m; its filling coefficient is 0.9. I have calculated that the safe height is 8.7 m, but for some reason I feel that this value is too low. I was wondering if my calculation is correct; thank you all.
I’ll come and learn* it too; the sphere tank isn’t in contact
The details regarding spherical tanks are not clear. For floating roof tanks, we generally refer to the locations of the vent holes and foam pipes on such tanks, select the lowest point among these two locations, and then leave a certain amount of headroom; this has little to do with the total height. I think some regulation states that the thickness of fire-fighting foam needs to be 200 mm or something; I can’t remember exactly. Another thing to note is to consider the effect of high temperatures on the expansion of the storage medium when the weather is hot. It’s a bit messy in how I put it, hehe
What was said upstairs makes some sense. The spherical tank is not very clear. For internal floating roof tanks, a safety height of 200 MM below the tank wall vent is generally recommended. If the tank wall height is 11.9 meters, the safe height is around 11.
You’ve covered quite a lot. I’ve also looked up some relevant information; the safe height is determined by subtracting the height of the fire-fighting foam, which is 300–350 mm, from the height of the tank, and then subtracting the amount by which the oil expands. As for the gym, I still don’t understand it
How to determine the safe height of vertical arch-top oil tanks? There are two principles for determining the safe height of vertical oil tanks: 1) When the oil is affected by temperature, its volume increase should not be sufficient to cause it to overflow from the fire protection pipelines ； 2) Once the oil tank catches fire, there is a certain thickness of foam layer on the surface of the oil. The formula below is used to determine the safe height of vertical oil tanks: H = Pt/P*(H1-H2) – H3. Where: H1: total height of the oil tank ； H2: Fire foam requires a certain thickness, generally 300~350 mm ； Pt: Oil density in the tank at the highest temperature during oil storage ； P: Average density at the temperature during oil collection in the tank ； H3: Maximum deviation of basic inclination.