Fundamentals of Manufacturing Processes (True/False Questions) 20170814
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Safety valves should be installed on the following equipment, which may experience overpressure under abnormal conditions: 1. Pressure vessels with a maximum operating pressure at the top of 0.1 MPa or higher； 2. Distillation towers, evaporation towers, and stripping towers with a maximum operating pressure at the top greater than 0.05 MPa (except those in which steam from the top of the stripping tower is fed into another distillation tower). (Error; it should be: 1. Pressure vessels with a maximum operating pressure at the top of 0.1 MPa or higher) ； 2. Distillation towers, evaporation towers, and stripping towers with a maximum operating pressure at the top greater than 0.03 MPa (except those in which steam from the top of the stripping tower is fed into another distillation tower). ）
Error. 0.03MPaG
This post was last edited by 678-2 on 2017-8-14 at 09:15. 1 Correct, 2 Incorrect. These two points are taken from GB 50160-2008 Code for Fire Protection Design of Petrochemical Enterprises, sections 5.5.1. 5.5.1 Safety valves shall be installed on the following equipment that may experience overpressure under abnormal conditions: 1. Pressure vessels with a maximum operating pressure of 0.1 MPa or higher； 2. Distillation towers, evaporation towers, and stripping towers with a maximum operating pressure at the top greater than 0.03 MPa (except those in which steam from the top of the stripping tower is fed into another distillation tower) ； 3. The outlets of each stage of reciprocating compressors, or the outlets of positive-displacement pumps such as electric reciprocating pumps, gear pumps, and screw pumps (except those equipped with safety valves of their own) ； 4. Where the equipment connected to the outlet of a blower, centrifugal compressor, centrifugal pump, or steam reciprocating pump is not capable of withstanding its maximum pressure, the outlet of the blower, centrifugal compressor, centrifugal pump, or steam reciprocating pump ； 5. Equipment in which combustible gases or liquids expand when heated, potentially exceeding the design pressure ； 6. Equipment with a maximum operating pressure at the top of 0.03~0.1 MPa should be installed in accordance with process requirements.
Correct; devices with a value above 0.1 are considered pressure vessels and require safety valves. Distillation equipment is at risk of overpressure in cases of abnormal heating or cooling