Johnson Intake Screen - Zebra Mussels
Johnson Intake Screen - Zebra Mussels
(OP)
Hi
We are looking to install a Johnson intake screen on our river intake. Does anyone have any experience (good or bad) with regards fouling due to zebra mussels? I know that Johson's can supply the screen in either 316 stainless or "mussel repellant Z-alloy." Does Z-alloy actually make a difference to mussel fouling?
Many thanks
We are looking to install a Johnson intake screen on our river intake. Does anyone have any experience (good or bad) with regards fouling due to zebra mussels? I know that Johson's can supply the screen in either 316 stainless or "mussel repellant Z-alloy." Does Z-alloy actually make a difference to mussel fouling?
Many thanks





RE: Johnson Intake Screen - Zebra Mussels
RE: Johnson Intake Screen - Zebra Mussels
RE: Johnson Intake Screen - Zebra Mussels
I dont think we will be able to get approval to use the z-alloy as its not on the approved list, so we will be stuck with the 316.
RE: Johnson Intake Screen - Zebra Mussels
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Here is a sample of permit text:
Screen Material – The wedge wire screens will be fabricated by Johnson Screens, Inc., of “Z-Alloy”, a material selected to prevent the colonization of zebra mussels on the screens. The nature of this material is such that it will leach a certain amount of copper into the water around and drawn through the screens. It has been calculated that the leaching of copper from the screens will cause an increase in copper in the freshwater outfall by 0.015 ug/L. By comparison, the chronic criterion for copper is about 17 ug/L and the background concentration is about 0.44 ug/L. The leaching of copper from the wedge wire screens is, therefore, not significant and will have no impact on aquatic life.
Not sure what regulation that you must meet to use the screen material, but would suggest that you push back and try to get the screen material approved. I do not understand why they would not approve it. It is likely that the screen material was invented after the regulation was written.
RE: Johnson Intake Screen - Zebra Mussels
RE: Johnson Intake Screen - Zebra Mussels
Did some checking with Johnson about their Z alloy. It is 90/10 CuNi, UNS 70600. The DIN equivalent is 2.0872; the EN equivalent is CW352H.
Hope this helps you out. Good luck in solving the zebra mussle problem.
I would be curious to know if the 90/10 is on your approved list.
RE: Johnson Intake Screen - Zebra Mussels
RE: Johnson Intake Screen - Zebra Mussels
RE: Johnson Intake Screen - Zebra Mussels