Caustic Soda Storage Tank Inspection
Caustic Soda Storage Tank Inspection
(OP)
Can any one help regarding recommended general guidelines for inspecting Mild Steel Caustic Soda Storage Tanks?
I have looked at the Dow website, but are there any national/Internationally recognised guidelines?
Thanks
Bluecat46
I have looked at the Dow website, but are there any national/Internationally recognised guidelines?
Thanks
Bluecat46





RE: Caustic Soda Storage Tank Inspection
RE: Caustic Soda Storage Tank Inspection
Depending on the time since last Internal Inspx, temperature of product, and strength of solution, you need to perform MT on between 10% and 100% of the weld seams. CSCC caught early can be 'buffed out' and not require any repair welding.
CSCC ignored for decades will cause thru-wall leaks. Don't ask how I know that,
RE: Caustic Soda Storage Tank Inspection
Been looking on the Dupont website with no luck, Can you post a link please
RE: Caustic Soda Storage Tank Inspection
RE: Caustic Soda Storage Tank Inspection
As we all know, there seems to be no single nationally-recognized standard for the recommended design of Caustic Storage tanks.
My related question is this:
What specific features should be incorporated into the design of NEW caustic storage tanks to minimize CSCC and perhaps make inspection easier ?
Additionaly, we are all aware of the good information provided by Dow. Are there any Interational guidelines available relating to caustic soda storage and transfer systems ?
Thanks.......and best regards
RE: Caustic Soda Storage Tank Inspection
PWHT all welds [too expensive]
Keep concentration below 30%, and keep the temperature only 10-20° above the freezing point of the concentration you are using.
Ease of Inspx: Slope floot to a sump-type floor drain.
Have clean-out nozzles around the roof about 10-ft in, and 20-ft apart. This allows a spray-ball inserted thru them to easily and quickly clean the walls of caustic "crusties".
Route the floor-drain line to somewhere that the effluent will be easy to acidize and get close enough to neutral pH to send to the sewer.
Have 120V power near the tank, so that the Mag Particle yoke is easy to plug in.