Design pressure of the ethanol and dichloromethane mixed medium
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This post was last edited by zhangjuhua on 2019-3-22 at 12:13. The medium is a mixture of ethanol and dichloromethane, with a design temperature of 150°C and design pressures of 0.4/–0.1. Is a design pressure of 0.4 sufficient? I did some research online: the saturated vapor pressure of ethanol at 150°C is 1 MPa, while that of dichloromethane is 1.65 MPa. So, must the design pressure be set based on the saturated vapor pressure? Is it usually only LPG for which the saturated vapor pressure at the design temperature is taken into account? I have discussed this with the client and reduced the design temperature
Is it a storage tank or a process equipment? If it is a storage tank, the design pressure should be taken as the saturated vapor pressure at the design temperature; if it is process equipment, it should be determined by the process systems team based on the process flow and operating conditions
For example: In the case of ordinary water distribution devices, the medium is water, and it can be obtained in accordance with standard technical requirements. Now there is a steam separator that indicates the saturated vapor pressure of the medium; in that case, the value of saturated steam should be used.