DEMIN WATER used for Hydrotest in carbon steel tank
DEMIN WATER used for Hydrotest in carbon steel tank
(OP)
Dear Guys.
I would appreciate some help about an issue (I've seen many comments regarding DEMIN water and corrosion issues in direct contact with carbon steel material)
Our Contractor is going to water filling a tank to perform hydrostatic test. Water quality is DEMIN WATER supplied by a Thermal Power Plant close of our Project.
The time to water filling the tank is expected in 3 weeks. All internal butt welded joints are not painted.
I have a concern because I’ve heard that DEMIN water could generate corrosion even higher than fresh water or potable water.
I have received quality certificate of this DEMIN WATER, which is attached. I would like to know some opinion of you guys. This DEMIN WATER could generate corrosion in this tank considering time storage (3 weeks)?
I read API 650 which states that if test takes more than 14 days, oxygen scavengers and some chemicals should be considered to be added.
Have you had before some situation like that?
I would appreciate some help about an issue (I've seen many comments regarding DEMIN water and corrosion issues in direct contact with carbon steel material)
Our Contractor is going to water filling a tank to perform hydrostatic test. Water quality is DEMIN WATER supplied by a Thermal Power Plant close of our Project.
The time to water filling the tank is expected in 3 weeks. All internal butt welded joints are not painted.
I have a concern because I’ve heard that DEMIN water could generate corrosion even higher than fresh water or potable water.
I have received quality certificate of this DEMIN WATER, which is attached. I would like to know some opinion of you guys. This DEMIN WATER could generate corrosion in this tank considering time storage (3 weeks)?
I read API 650 which states that if test takes more than 14 days, oxygen scavengers and some chemicals should be considered to be added.
Have you had before some situation like that?





RE: DEMIN WATER used for Hydrotest in carbon steel tank
RE: DEMIN WATER used for Hydrotest in carbon steel tank
RE: DEMIN WATER used for Hydrotest in carbon steel tank
Since this water will be there for so long you have to expect things to start growing, which is not good.
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P.E. Metallurgy, Plymouth Tube
RE: DEMIN WATER used for Hydrotest in carbon steel tank
RE: DEMIN WATER used for Hydrotest in carbon steel tank
if you estimate the ratio "time with corrosive demin water / lifetime of the tank" and consider a very high corrosion rate of 1mm/y, maybe you will be able to conclude that the transcient operation with demin water can be tolerated because it lasts only a very short time, if it is not a continuous corrosive service.
regards
RE: DEMIN WATER used for Hydrotest in carbon steel tank
You should always use water soluble corrosion inhibitor for hydro-testing, because corrosion effect increases exponentially at high pressures.
Regards,