Abstract: The packing seal is an important part of the new hydrogen compressor, and its working reliability determines the operating cycle of the compressor. Based on the three consecutive leakage failures of the three-stage packing seal in the new hydrogen compressor, this paper analyzes the causes of the packing seal leakage from the structure, arrangement form and disintegration inspection results of the packing seal. It proposes such measures as changing the packing ring material, combination form, and increasing the oil injection amount for improvement. After 4 months of operation practice, the results indicate that the effect of the revamped packing sealing is good and the service life is extended. The successful revamp of this case provides valuable experience for the repair of packing seals in new hydrogen compressors.

Key words: new hydrogen compressor, packing seal, leakage, decompression ring, eccentric wear