Air moisture absorption by chemicals

[shvet]

Dear forummembers

Please share knowledge/experience

We have chemicals [let's say 99.9% methanol]. We unload these from car tanks to storage tanks and from storage tanks to a tanker. What if we store and load/unload these not using inert gas. E.g.:
- inbreath of car tanks by ambient air
- breathing of storage tanks by ambient air during let's say 7 days
- outbreath of tanker by ambient air and transport during let's say 7 days
Will [let's say] methanol become delited up to 99.8% as a result of such transloading?

I hope my idea is clear. Any links and personal experience will be appriciated.

 

[georgeverghese]

Corrosion of carbon steel and SS with methanol in contact with humid air is well known in the oil/gas industry. Tanks should always be dry N2 padded. Watch out for inert gas generated with PSA driers and oil flooded screw compressors - most likely this is offspec and humid "inert gas". Use oil free air compressors for inert gas generation.

 

[shvet]

Corrosion of carbon steel and SS with methanol in contact with humid air is well known in the oil/gas industry.

Can you tell more?