Accident discussion: The issue of tank explosion
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This post was last edited by ateanliew on 2011-10-28 08:21. Please help analyze the reason. There is one residue oil tank with a capacity of 5,000 cubic meters; in early winter, the residue oil inside the tank is quite viscous. To facilitate transportation, the production workers use them. Steam is directly introduced into the tank to provide heating. After the steam valve was opened, two hours later a tear appeared at the junction of the tank’s roof and the wall panels, accompanied by a loud noise. I still don’t know why; I hope experts and experts out there can help analyze it. The storage tank has a vent port with a DN125 size, at a saturated steam pressure of 0.5 MPa. Intake DN50
Steam is introduced for 2 hours; what is the steam pressure? Medium voltage or low voltage? What is the steam temperature? When residue oil is heated, a large amount of oil vapor is generated, causing the pressure inside the tank to rise and leading to a physical explosion due to overpressure.
It’s overpressured; only inflow is allowed, with no outflow arranged. For example, do humans only eat and not defecate? Can they tolerate that?
Reply to 3# HaiChuanKe nibo: The storage tank has a vent port with a DN125 size, and the steam pressure is 0.5 Mpa. Atmospheric large-scale storage tanks.
Reply to 4# ateanliew: Although there is a vent, pressure needs to be monitored when using steam for drying; if the pressure rises too quickly, it can easily lead to an explosion.
Reply to 1# ateanliew: It should not be ruled out that there may be certain issues with the equipment itself; uneven heating during the heating process could potentially cause the tank to tear.
Reply to 4# ateanliew: You need to consider the amount of material discharged from your outlet as well as the pressure involved in the tank. You can calculate the force exerted on the top of the tank when a pressure of 1 KPa is applied
Reply to 1# ateanliew: Is there any residue oil that has just been produced? It’s likely that the steam heated too quickly, causing an excessive accumulation of oil and gas inside the tank, which led to extremely high pressure ； It’s also possible that there is high-temperature oil inside the tank, and the steam carries water in, leading to excessive vaporization and overpressure.
Reply to 1# ateanliew: I didn’t do it that way. . . There should be standard operating procedures, and one should proceed slowly in accordance with them. . . There should be a steam coil inside the tank. . . Why wasn’t a coil heater used? . .
The pressure and temperature in the storage tank are both high, resulting in a rapid flow at the vent opening that leads to fire and explosion! ! A foolish opinion
The increase in internal pressure due to the evaporation of oil and gas is significant, resulting in a loud noise – it’s like a balloon getting punctured all at once.