Need Help on Seawater Seals for a shaft
Need Help on Seawater Seals for a shaft
(OP)
Hi All,
I need help in finding a seawater seal. I have a unique application where I have two filtered (to 10 microns) seawater filled chambers. A shaft turning at 3000 RPM runs between the two chambers. Chamber #1 will vary in pressure from ambient to 750 psi. Chamber #2 will have a pressure either equal or less than chamber #1, with minimum pressure in it being ambient. I need a seawater seal for the shaft going between the two chambers so that seawater doesn't flow between the two. Does anyone have a recommmendation for a seal that would do the job? And would anyone have a recommendaton on the shaft material? I'm assuming a Stainless Steel shaft would work well in this application, but anyone's experience would gladly be appreciated..
Gordon
I need help in finding a seawater seal. I have a unique application where I have two filtered (to 10 microns) seawater filled chambers. A shaft turning at 3000 RPM runs between the two chambers. Chamber #1 will vary in pressure from ambient to 750 psi. Chamber #2 will have a pressure either equal or less than chamber #1, with minimum pressure in it being ambient. I need a seawater seal for the shaft going between the two chambers so that seawater doesn't flow between the two. Does anyone have a recommmendation for a seal that would do the job? And would anyone have a recommendaton on the shaft material? I'm assuming a Stainless Steel shaft would work well in this application, but anyone's experience would gladly be appreciated..
Gordon





RE: Need Help on Seawater Seals for a shaft
http://www.balseal.com/products/index.php
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RE: Need Help on Seawater Seals for a shaft
As for shaft material, some sort of stainless, yes, but you have to be careful. Depending on your temperatures, some stainless materials don't react well with the chlorides in sea water. Unless you're running cold I'd avoid austenitic stainless, martinsitic might work though. Or you could look at marine grade shaft material like aqualloy.
RE: Need Help on Seawater Seals for a shaft
Historically Monel 400 or K-500 was used depending on strength needed. You could use a 6%Mo superaustenitic stainless, but this would be almost as expensive as Monel these days.
Your best bet might be a duplex. You could look at 2205. It will not be immune to corrosion in this application, but it should work.
Try John Crane for seals. The metal parts will all need to be Ni alloy.
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RE: Need Help on Seawater Seals for a shaft
A.
RE: Need Help on Seawater Seals for a shaft
RE: Need Help on Seawater Seals for a shaft
Stainless steel is generally not recommended but Duplex materials are very common for cast and machined parts in cartridge mechanical seals. However Monel is safer but very expensive (with the multi-springs in Hastelloy).
If you want further good application data, you can look on www.aesseal.com
RE: Need Help on Seawater Seals for a shaft
I would give these people a call.
http://www.wbmetals.com/shafting.asp#22