Use of diesel hydrogenation glass plates
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This post was last edited by coollong400 on 2012-1-29 at 18:34. The glass panels of the glass plate level gauges used for measuring sulfur-containing wastewater in our plant’s diesel hydrotreating unit have experienced fractures. The operating pressure in the high-pressure tank is between 5.5–7.0 MPa, and the sulfur content of the feed material is around 2000 ppm. Since water is injected before entering the high-pressure tank, a level gauge made of glass panel is installed at the bottom of this tank. We would like to know how others manage their high-pressure glass plate level gauges; we’d appreciate any insights you can share. Additionally, we are interested in knowing the typical service life of these glass panels, and we hope that those with experience can share their knowledge on this topic. As a supplementary note, our diesel hydrogenation units operate in intervals with long gaps between starts, so the available data is not very comprehensive.
We are using a float-type magnetic flap level gauge, but its performance is poor; the level indication is very inaccurate
Glass plates can generally last for two major maintenance cycles (with a cycle length of three years), but this depends on the quality of the glass plates; I recall incidents in some petrochemical plants where glass plates cracked and caused fires.
Quartz level gauges used in high-pressure areas are generally quite short; for measuring the level at such high pressures, it is best to use float-type magnetic flap level gauges. We, as operators on site, check the liquid level every 2 hours in conjunction with the chief operator to ensure that the level in high-pressure areas remains normal
It’s best not to use glass plates, as their pressure resistance is very dangerous. There are many incidents of glass tube explosions! Plus, the medium contains a large amount of hydrogen! Try not to use glass tubes at all. Our factory uses magnetic flap valves! Two remote ones and two on-site ones are also needed! ! I also would like to discuss with everyone the potential areas for energy savings in the hydroprocessing of gasoline and diesel! I hope everyone will discuss more!
Quartz tubes have a limited capacity to withstand high pressures; consider using a float-type magnetic flap level gauge instead.
Why isn’t it working well? I notice that many of the new installations in Dushanzi use magnetic flap type level gauges. Could you provide some information on them? Regarding issues such as gauge calibration, pipeline blockages, or other problems?
It is recommended to use a magnetic flap level gauge; its pressure lead wires have a larger diameter, so there are basically no issues with clogged pipelines. As it is an on-site display device, as long as the values for the densities of the two liquids are provided accurately during the initial design phase, calibrating the gauge is simple. In most cases, what happens is that the magnetism in some of the magnetic flaps fades away, and the gauge simply needs to be re-magnetized.
Do you have any experience with energy-saving minor modifications for diesel hydrogenation?
Manufacturers of glass plate level gauges need to choose carefully； Jerguson glass plate level gauges made in the United States are an option to consider, though their price is exorbitantly high. You can seek consultation from domestic technical service providers: Cangli Energy