Saltwater environment fasteners

[CajunCAD]

I am working on a project that will have components submerged in a saltwater environment for 6 months to 1 year. I am looking for recommendations on fasteners that can survive this environment and are relatively inexpensive as well as commercially available (don't want to have to machine custom 718 or 725 fasteners). Any help would be appreciated (literature/documentation sources would also be appreciated).

Thanks for your assistance.

Louis

 

[CoryPad]

This previous thread has relevant information:

thread332-39661


Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[stanweld]

There are number of materials available but you need to provide more info. What materials are being fastened? What is the temperature. Is this in sea water or other salt water environment? Is salt water deaerated? Is application in flowing (flow rate?) or stagnant conditions?

 

[CajunCAD]

The additional information is as follows:

AISI 1018 (epoxy coated) assembly is being attached to a subsea tree (probably Inconel 718 - working on confirmation).

environment - approximately 4000' seawater - unknown current conditions.

Our current plans are to go ahead with the custom manufacturing of Inconel 725 fasteners to provide corrosion resistance, strength and minimize gall potential.

 

[stanweld]

Your plans look good to me.

 

[CajunCAD]

Thanks for your input.

We originally hoped to find commercially available fasteners which could be considered disposable. After some searching, we decided that custom fasteners would have to be manufactured and settled on the 725 material.

 

[JimMetalsCeramics]

Check out:

http://www.advancedengineeredproducts.com/aepintro.htm

http://www.zingacoating.com