What grade stainless steel works best in a swimming pool
What grade stainless steel works best in a swimming pool
(OP)
Hi! I am designing a surge tank for a local swimming pool and am looking for the best resistants against rust. This will be an enclosed tank. I have seen 304l and 316l rust in these situations. The calcium hyperchlorite level should never reach above 3 ppm. I was thinking 317l would be about the best bet. Any help would be greatly appreciated. Thank you.





RE: What grade stainless steel works best in a swimming pool
RE: What grade stainless steel works best in a swimming pool
The key to corrosion control in this situation is properly defining the pH and chloride ion concentration ranges. If the liquid is well mixed preventing cloride concentration in dead spots, stays below 5 ppm and does not get heated above 60°C, 316 should not rust or pit. However if there are excursions outside of these ranges you can get corrosion quickly. Weekly super chloriniation or occassional shut down of flow/pumps, not following the chemical regiment correctly are all possibilities that could lead to adverse conditions. Basically the chloride ions destroy the passive layer of a stainless allowing corrosion to proceed as it would with an alloy or carbon steel.
Also if you have any pipes or tubes welded to this tank the weight of these items may induce stress corrosion cracking in the stainless (even with no apparent signs of corrosion elsewhere) if they are putting a load on the tank. Also poor welding can sensitize the metal to corrosion by depleting the chromium in the weld region. A master welder with experience with stainless or nickel based alloys is highly recommended.
also try asking your question here:
http://licensed-electrician.com:8080/~2
there are pool industry professionals at that board that may be helpful.
good luck
RE: What grade stainless steel works best in a swimming pool
RE: What grade stainless steel works best in a swimming pool