Compressors handling ‘sour’ natural gas with higher levels of Hydrogen sulphide can strike real problems if the oil interacts with the product gas and any moisture is present. The result is an attack on the compressor alloys called sulphide stress cracking, a form of hydrogen embrittlement. In extreme cases this can cause a compressor casing to split.
Additives are designed to be a sacrificial product. They are consumed as the additive pack anti-oxidant neutralises unwanted chemical contaminants. However, if additives such as demulsifiers (which help shed water) are exposed to large amounts of water contamination, the demulsifiers can be stripped from the oil very quickly leaving the oil at risk.
Other additives like Extreme Pressure (EP) and Anti-wear (AW) can be hydrolyzed (broken down into acids) by water and deny your Equipment the protection those additives are designed for. If left unchecked the by-product is sludge and varnish.
A trial of machines by the BHRA compared equipment life to moisture contamination. They found the correlation between dry oil and oil with high moisture content. Oil with a moisture level of 5,000 ppm was dehydrated and trialled to measure equipment life. The results show that equipment with oil drier than 100ppm has three times the life of a machine with oil of 450ppm moisture.
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