Commissioning of low-temperature propane bimetallic tanks
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In the storage area behind the dock, liquefied propane is unloaded; what should be done if there is water in the newly installed pipeline from the dock to the cryogenic bimetallic tanks? Is there any good way to completely blow out the water?
Before operation, nitrogen purging is still required, and the oxygen concentration in the pipelines and storage tanks must be within acceptable limits. After the propylene is fed in, the nitrogen-containing material must also be vented to the flare until the propylene concentration reaches the required level.
Our plan also involves using compressed air for blowing first, followed by nitrogen displacement, but we are concerned that water might remain in some hard-to-reach areas; low-temperature propane could freeze there and eventually block the pipelines.
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I would like to ask: what dew point is required for low-temperature tank drying to be considered satisfactory? What is the typical required dew point for the nitrogen used?
Ball passing through the pipeline, followed by nitrogen purging