Cathodic Protection on Sea Water Cooling Pump( Capacity 19200 cu.m/hr)

This might help...

http://www.edi-cp.com/pdf/factors.pdf

Consider using plastic-bodied pumps with plastic impellers.

Treat it just as you would equip a steel boat hull and a steel propeller with a steel shaft of similar or identical materials to what you have. Your pump is identical in function to that of steel boat/ship propulsion gear.

The best place to start would be a search of "cathodic protection for steel hulled boats and steel propeller shafts." From there contact some of the manufacturers/dealers with technical service depts. and talk to them.

No endorsement of anyone but here are several sites that would be worth looking at and contacting. They want to sell you their products and not have any problems with them after you buy their products so they should be quite honest about them.

http://www.performancemetals.com/images/pdfs/Bonding_and_Cathodic_Protection_of_Vessels2.pdf

http://oya.com/yardblog/wp-content/uploads/2011/01/E-02.pdf

http://www.galvatest.com/WP_Cathodic_Protection.pdf

http://www.nordhavn.com/resources/tech/corrosion.php

http://www.martyranodes.com/content/martyr-resources/Aluminum%20Anodes.pdf

http://www.cathodicme.com/sacp.html

Good Luck, Old Salt

Is this on a metal ship?

This is sea water pump at a power plant.

One thing I forgot to ask is also: will the pump be powered with an electric motor or with a different kind of source?

Concerning your pump, you will need to follow the manufacturer's advise: he is using some slightly different material in his pmp. What happens there should be fixed according his recommendations. (the 316 material is pretty stable)

The whole setup is a different matter.

You will need to provide a ground for the motor and eventually, when the coupling or belts do not connect the two units galvanic there is not a problem.

Only when your ground is very bad and will be connected to the pump housing, your 316 shaft will start showing pitting.

This will be the case when the pump is not running and just sits flooded in sea water, because the seawater will provide a ghost ground when running and level the differences.

I'll second the above and just add, if you don't want to educate yourself by taking the time reading the Code of Federal Regulations you could simply contact the manufacturer of the pump or the person in your company who authorized its purchase.

first of all: go back to the OEM pump manufacturer and distributor and discuss in detail their recommendations for warranty coverage, and what your previous intentions were.

second: Your power plant is large enough to consider making use of a bona fide corrosion engineer at least on a paid consulting basis.

third: what was done in the way of cathodic protection on active steels before, and what was done to protect stainless steels. These are separate issues, and might not work out well treated by the one-basket approach.