How to drain and empty an propylene pump?
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When an acrylic pump is operating normally, the liquid acrylic temperature is 40ºC at a pressure of 4 MPaG. If this pump is stopped, how can the liquid acrylic inside it be completely drained? If it is directly discharged to the flare, the temperature after flashing will be -47ºC. . How to avoid using pumps made of low-temperature materials? O(∩_∩)O Thank you
First, relieve pressure to the flare, then purge with nitrogen.
If pressure is released to the flare, wouldn’t it immediately drop to -47ºC due to depressurized vaporization? Can the pump and the pipes downstream handle that?
For pumps and pipelines, since liquid propylene flows through them, the low-temperature conditions associated with vaporization are not a concern; however, pipelines leading to the flare system need to take low-temperature conditions into account. . . . This is how we consider the project we are working on now. . .