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[Discussion] Why natural gas could be so strong to erode the stainless steel impeller

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[LV.5]常住居民I

发表于 2019-2-15 15:48:19 | 显示全部楼层 |阅读模式
北京中仪天信科技有限公司
The impellers of one compressor were found heavy erosion during the inspection performed for rutine maintenance. The vanes were damaged most probably by erosion/corrosion just after 5 years service, and have to be repaired or replaced before the compressor will be installed again.  
Could you imagine that the natural gas (the working media of the compressor) was so strong to hurt the stainless steel impreller?


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[LV.7]常住居民III

发表于 2019-2-22 15:48:04 | 显示全部楼层
There is one possibility:
In most case, the element Chromium in the stainless steel could react with element Sulfur, especially in the high temperature.
Not sure the nature gas you used are filtered, but there do have Sulfur in most nature gas.
Probably that, in the high temperature environment, the Sulfur from the nature gas react with Chromium in the stainless steel, with the contribution from gas flow rush, corrosion on you compressor impeller happens.

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cjzhou + 20 + 50 感谢支持!

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[LV.9]以坛为家II

发表于 2019-2-21 11:57:47 | 显示全部楼层
This may caused by stress corrosion .
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[LV.5]常住居民I

 楼主| 发表于 2019-2-15 15:50:18 | 显示全部楼层
Pictures showing the impeller
impeller-1.jpg
vane erosion-1.jpg
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[LV.9]以坛为家II

发表于 2019-2-16 08:54:56 | 显示全部楼层
Every little beat helps
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[LV.6]常住居民II

发表于 2019-2-21 15:05:14 | 显示全部楼层
Maybe you shall buy the product with API certified in order to avoid such problem happen again
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