The amount of gas escaping from the acidic water tank is calculated based on the tank’s temperature
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Recently, while studying a certain type of installation, I encountered a part where the calculations were completely unclear to me. I was wondering if anyone could help me understand this: 1. For example, in the case of an acidic water degassing tank, when calculating the diameter of the gas outlet pipe, even if no gas is produced due to flashing, a pipeline for venting acidic gas is still required. So, what is used as a basis for estimating the amount of gas in such a degassing tank? 2. In the acidic water buffer tank, how is the gas escaping from the top of the tank estimated? 3. In a large tank with a flat conical top, how can one calculate the effect of the ambient temperature during summer on the surface temperature of the tank? Thank you!
1. An acidic water degassing tank: in the simulation calculations for determining the diameter of the gas-phase discharge pipes, no gas is produced during flashing; nevertheless, a pipeline for discharging acidic gases is still installed. This is done in view of various situations such as accident conditions, overheating due to heat exchange, and temporary shutdowns during summer when the equipment is exposed to sunlight. In some cases, it is also used for cross-line venting and similar purposes. 2. In the acidic water buffer tank, the flashing of the gas escaping from the top of the tank shall be calculated based on temperatures under extreme or special conditions. In most cases, reference must be made to similar devices. 3. The impact of ambient temperature on the surface temperature of tanks during summer is explained in great detail in a book titled \"Design for Storage and Transportation of Oil Products\".
Thank you; now that you’ve explained it, I understand. My initial understanding was that when the owner provides the design parameters, the parameters of the upstream devices can vary, so the downstream devices need to take into account these fluctuations in the upstream devices – is that correct?
The design must include a certain amount of margin.