Hardened Rotating Shaft Material
Hardened Rotating Shaft Material
(OP)
Hello,
We are having a problem. We currently use a 316 lead screw in our water treatment reactors. We chose 316 for corrosion resistance, but we are having issues with our seals at the end of the chamber. Our seal supplier suggested having a harder material for the shaft and I am looking for suggestions. The material must be compatible with potable drinking water and resist corrosion. I am thinking that we will likely stick with the 316 lead screw and perhaps couple it to another shaft to go through the seals. Unless someone can suggest an appropriate lead screw.
Our lead screw runs about 4-5 times per day at ~150 rpm for about 5-10 minutes at a time. To be honest, I'm surprised the shaft hardness is causing us problems with such a low duty cycle. I believe that there might be contaminates in the water that are embedding in the shaft and hurting the seals although I'm not entirely sure since there is little to no axial motion. It is our seal supplier who is telling us that hardness is the problem although I'm not so sure.
Any tips, advice, leads?
Thanks in advance,
Joel
We are having a problem. We currently use a 316 lead screw in our water treatment reactors. We chose 316 for corrosion resistance, but we are having issues with our seals at the end of the chamber. Our seal supplier suggested having a harder material for the shaft and I am looking for suggestions. The material must be compatible with potable drinking water and resist corrosion. I am thinking that we will likely stick with the 316 lead screw and perhaps couple it to another shaft to go through the seals. Unless someone can suggest an appropriate lead screw.
Our lead screw runs about 4-5 times per day at ~150 rpm for about 5-10 minutes at a time. To be honest, I'm surprised the shaft hardness is causing us problems with such a low duty cycle. I believe that there might be contaminates in the water that are embedding in the shaft and hurting the seals although I'm not entirely sure since there is little to no axial motion. It is our seal supplier who is telling us that hardness is the problem although I'm not so sure.
Any tips, advice, leads?
Thanks in advance,
Joel





RE: Hardened Rotating Shaft Material
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Hardened Rotating Shaft Material
Why not get a sample of the water that surrounds the shaft and have it tested before leaping to change shaft material.
regards
desertfox
RE: Hardened Rotating Shaft Material
= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net
RE: Hardened Rotating Shaft Material
What bears on the ball screws? A metallic nut, or ???
This Cronidur stuff is expensive, but remarkable when paired with the right mating material.
http:
RE: Hardened Rotating Shaft Material