Which process would Corrode a 316L Pipe more quickly?

[GIBSTJEAN]

Hi All,

All things being equal would the ID of a 316L SS Pipe corrode faster in theory if it were constantly full of fluid or drained between transfers? Seemed like a straightforward answer at first until I noticed posting with respect to corrosion rings in vessels at the junction of liquid to head space and Dry Sprinkler systems corroding faster than Wet Sprinkler systems due to the introduction of air after scheduled test/drain cycles.

Wondering if the repetitive cycle of wetting/evaporation/introduction of CO2 and Oxygen in air is worse (wrt to corrosion) than just leaving the line full between batch transfers.

Any thoughts or references would be greatly appreciated.

Best Regards,

Gib

 

[unclesyd]

Your question in the OP has no specific answer.
Need to give the process material under consideration and any other information you have

 

[EdStainless]

Most often it would be if it were drained, because it would not fully drain and dry, thereby allowing impurities to concentrate.

Of course keeping it full only helps if it is actually full. 98% full does not count, it only moves the line of corrosion from the bottom to the top of the pipe.

You want either full and flowing, or empty and dry.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube