... united compressor in major type of hydrogen, propylene, ethylene compressorSuitable for Oxygen, Nitrogen, Hydrogen, Carbon Dioxide, Ammonia, Synthetic Gas, Rich Gas ... -51structure typeDDDMcompressed mediumNatural gasPetroleum gasNatural gasNatural gascooling stylewater coolinglube style for cylinderoil freeoil freeoiloilNo. of row2224No. of compressing stages2223capacity(m3/min ...