【Process Area Event – Bizarre Designs – 01】– Residue Hydrogenation Cold High-Pressure Separator
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This post was last edited by A Chuan on 2017-8-16 at 10:04. 1. There is no on-site level gauge. 2. The orientation of the angle valve in the drawing seems to be incorrect. 3. Are the drain pipes at positions 3 and 4 appropriate?
Does the level gauge come with an on-site display?
However, the output signal is the same as that of the central control unit; if there is a fault, both will fail. A dedicated on-site level gauge should be installed to facilitate the calibration of the control room level reading
There are also those without an on-site liquid level gauge, and the on-site liquid level can sometimes fail as well.
Ordinary globe valves are installed with the inlet at the lower level and the outlet at the higher level, but considering the issue of leakage, globe valves for high pressures and those with a diameter of DN100 or larger are also installed with the inlet at the higher level and the outlet at the lower level； Operating with high inlet pressure and low outlet pressure can help prevent internal leakage, but the operating pressure is usually relatively high. Check valves with low inlet pressure and high outlet pressure are relatively easier to open, but they have a greater tendency to experience internal leakage compared to the former type ；
1. It is not necessary to have a liquid level indicator on site; moreover, this representation seems to indicate the liquid level at the site. 2. I agree with the answer from the 5th floor – the direction of the stop valve depends on the type of medium and pressure, and it is not fixed. 3. There should be pressure relief measures between the two valves; relevant standards can be referred to for this purpose
Group owner, why is the direction of the corner valve incorrect? I’d like to hear the details. Also, I don’t think there’s anything wrong with the drain guides at positions 3 and 4.
This post was last edited by jingsan on 2017-8-19 08:18. This is the high-pressure separator for hydrogenation; judging from the flow diagram, it seems there are no issues.
1. The level gauge has a display function； 2. It is a three-way bar there ； 3. A check valve should be installed there.
That makes sense; I’ll go and take a look on site when I get the chance.
This internal structure isn’t shown; it seems to be of domestic manufacture. There’s nothing wrong with the corner valves, but the design includes too many drain lines, which create additional points of high-pressure leakage. It’s not quite like the high-pressure centrifugal separators I’ve seen before – it still appears to have level indicators. High-pressure centrifugal separators are primarily used for separating the liquid phase of circulating hydrogen, so it doesn’t seem to be a high-pressure centrifugal separator. Is this a high score in cold conditions?