How to relieve pressure after removing a faulty plate and frame air cooler
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The liquid hydrocarbon air cooler of this unit leaked; it was immediately removed. How to relieve pressure after removal? How can the medium inside it be removed? It meets the conditions for maintenance, and it contains extremely high concentrations of hydrogen sulfide. Please share your thoughts: the medium flowing inside the air-cooled system is a liquid hydrocarbon containing hydrogen sulfide, with a working pressure of 0.75 MPa and a working temperature of 80–120 degrees Celsius
Since the medium inside the air cooler is oil and gas containing hydrogen sulfide, nitrogen should be used to blow the oil and gas in the air cooler into the vent line. Of course, the specific way of connecting the nitrogen depends on the actual conditions. The presence of hydrogen sulfide makes handling this task somewhat dangerous.
First, the oil and gas inside the equipment are discharged into the gas line or flare line. When the pressure returns to normal, N2 purging is used for displacement, or steam purging yields better results; the purging time should be no less than 24 hours. After that, air is used for displacement, and the equipment can be opened for maintenance only after the oxygen content in the sample meets the required standards