Internal Pipe Corrosion from Seawater
Internal Pipe Corrosion from Seawater
(OP)
I am designing a piping system in which untreated seawater is pumped through the lines. I have done some research, and I have found many options. I am wondering if anyone can make a recommendation for my situation and narrow my search.
Stainless steel and other expensive metals are not suitable for this operation due to cost.
PVC and other plastic pipe are also not suitable.
I have been researching seawater resistent epoxy internal coatings. Does anyone have any experience with this?
The life of the pipe should only be 5-10 years.
Thanks
Stainless steel and other expensive metals are not suitable for this operation due to cost.
PVC and other plastic pipe are also not suitable.
I have been researching seawater resistent epoxy internal coatings. Does anyone have any experience with this?
The life of the pipe should only be 5-10 years.
Thanks





RE: Internal Pipe Corrosion from Seawater
For large lines cement lined steel is common, or simply reinforced concrete.
Resin lined steel is often used also.
For such a short service life SS is too expensive, and most other options will be also. Typical design life is 40 year min with expectations of 75 years.
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Plymouth Tube
RE: Internal Pipe Corrosion from Seawater
Have you evaluated (by spreadsheet of initial cost of purchase of pipes plus supports plus valves plus lining price compared to final price of larger pipes plus larger supports (but fewer supports?) plus liner price plus larger valve prices plus ijncrease (?) installation and shipping prices) to see what happens if you increase pipe sizes by +1 size (from 12 inch to 14 inch dia, or from 16 inch dia to 20 inch dia) to slow flow rate and reduce erosion levels?
RE: Internal Pipe Corrosion from Seawater
RE: Internal Pipe Corrosion from Seawater
Cheers,
gr2vessels
RE: Internal Pipe Corrosion from Seawater
RE: Internal Pipe Corrosion from Seawater
Shipboard water desalination systems have ductile iron piping as entry level material of construction, while nuclear submarine water desalination systems use titanium - a wide extreme indeed.
The older power plants at coastal locations had ductile / cast iron used for seawater cooling systems. Coastal cities fire sea water piping and hydrants also have ductile iron piping.
RE: Internal Pipe Corrosion from Seawater
RE: Internal Pipe Corrosion from Seawater
Reconsider FRP/GRP piping materials. Stay away from metallics
They are suitable for a long life, have virtually no seawater corrosion and they are permitted by the USNAVY fir shipboard use.
What was your reason for omitting this important group of materials ?
(I agree that HDPE and PVC are not suitable....and they lack strength)
RE: Internal Pipe Corrosion from Seawater