Problems with the design of the vent pipe for the safety valve at the top of the settler
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The vent from the safety valve at the top of the settler should be connected to the flare system. From both process and safety perspectives, what is a more reasonable design approach? Process conditions: Temperature 520℃ ； Landing pressure: 0.3 MPa (a) Last edited by netuser on 2009-3-9 22:47]
Bottom-mounted air defense systems have been largely eliminated in recent catalytic designs; they are generally installed at the top of the distillation tower and connected to the flare line
Upstairs; maybe I didn’t explain myself clearly. Bottom discharge has been basically eliminated, but what I want to ask is about the discharge line of the safety valve – the bottom safety valve won’t be removed, right?
The settler pressure is adjusted by the speed of the compressor and the venting at the compressor inlet； The settler is not equipped with a safety valve ； The original design called for a safety valve to be installed at the top of the distillation tower to allow direct venting. However, for safety reasons, the venting line was connected to the flare line; meanwhile, the maximum venting capacity of the flare line had to be assessed, and any deficiencies in this capacity required modification.
1. Safety valves are not installed at the top of the settler. The main reasons are as follows: first, the temperature there is too high, making it difficult to eliminate the stresses in the pipelines when they are cold or hot; second, due to the lack of a buffer area, catalyst loss is significant; third, the volume of oil and gas is large, so the pipeline diameter must be very large in order to achieve the required flow rate for pressure relief. Based on this, all designs include the installation of safety valves at the top of the distillation tower to achieve pressure relief; moreover, current designs do not permit pressure release into the atmosphere, with all pressure being released into the low-pressure pipeline network. 2. A vent valve must be installed at the top of the settler to facilitate purging during startup and shutdown.