Screw compressor
Thread Content
Is it necessary to purge with nitrogen after shutting down a twin-screw compressor? {:2_43:} (The medium is butadiene, which polymerizes easily)
It is recommended to perform nitrogen purging; otherwise, gas will leak into the lubricating oil, causing contamination of the latter. It is advised to keep the nitrogen seal active after the purging process is completed
I agree with you, but it needs to be replaced.
After the unit is moved to a remote location and thoroughly purged with nitrogen, it is advisable to fill the unit with nitrogen as a protective gas, and the sealing gas should also be nitrogen.
It is necessary to perform replacement followed by nitrogen sealing for protection, which is better for the equipment
For media like yours, it is recommended to replace it with nitrogen for protection regardless of how long it has been shut down.
After shutdown, the butadiene unit generally requires nitrogen purging, as butadiene may polymerize on the unit’s blades at high temperatures; it is therefore crucial to reduce its concentration. However, not all systems have the conditions necessary for nitrogen filling and pressure maintenance; in butadiene compressors, the lubricating oil pressure is usually set precisely, and the pressure after nitrogen is introduced cannot be too high, as this may damage the mechanical seal.
It is necessary; nitrogen displacement has two advantages: first, it prevents the medium from self-polymerizing inside the machine head, which could cause jamming； Second, isolate it from air to prevent corrosion and rusting of the screw and casing