Bolted Protection Cover
Bolted Protection Cover
(OP)
We have an existing high strength steel anchorage system that we are proposing to protect the exposed end for several decades.
There is a welded stainless steel(316L) protection cap assembly that bolts to the anchorage end. The entire assembly will be submerged in slow flowing river water and submerged approx 15'. The stainless steel cap is not watertight.
There is discussion in the office about the type of fastener to secure the stainless steel end cap to the high strength steel anchorage, the choices being: stainless steel, mild steel or HDG steel.
The mild steel and HDG can be dielectrically isolated from the stainless steel cover using an epoxy coating. The fasteners which attach to the high strength steel anchor will be submerged in the river water; they will be somewhat protected by the stainless steel cap.
Any comments, problems, or suggestions would be appreciated.
Dik
There is a welded stainless steel(316L) protection cap assembly that bolts to the anchorage end. The entire assembly will be submerged in slow flowing river water and submerged approx 15'. The stainless steel cap is not watertight.
There is discussion in the office about the type of fastener to secure the stainless steel end cap to the high strength steel anchorage, the choices being: stainless steel, mild steel or HDG steel.
The mild steel and HDG can be dielectrically isolated from the stainless steel cover using an epoxy coating. The fasteners which attach to the high strength steel anchor will be submerged in the river water; they will be somewhat protected by the stainless steel cap.
Any comments, problems, or suggestions would be appreciated.
Dik





RE: Bolted Protection Cover
Look at this site:- you might suffer pitting corrosion of the stainless steel cover:-
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RE: Bolted Protection Cover
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Bolted Protection Cover
The protection cap assembly and the fasteners are somewhat consumable and can be replaced if necessary. The cover is 1/2" 316L stainless and should have some durability. The cap's function is to protect the anchorage from damage and the fastener's purpose is to secure the cap to the anchorage.
The concern is corrosion damage to the high strength steel anchorage. Would the stainless steel, mild steel or HDG steel provide the least likely corrosion?
I was a bit surprised that the epoxy coating would not act as a dielectric 'barrier'.
Dik
RE: Bolted Protection Cover
In place of 316 use 2205. It is stronger, more corrosion resistant (especially the welds), and about the same price.
Any chance of adding galvanic protection for the steel?
If not you may be better off using plain steel for the cap.
The last thing that you want is the SS cap causing corrosion of the anchorage.
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Plymouth Tube
RE: Bolted Protection Cover
We had already looked at using HDG for the assemblies, but timing is critical.
Dik
RE: Bolted Protection Cover
You can get about any product form in 2205, distributors in Houston stock a lot of it for refinery usage.
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Plymouth Tube
RE: Bolted Protection Cover
Dik