Pipe material
Pipe material
(OP)
What kind of pipe material can be used to flow sea water so that it would not corrode?
What is the cost of this pipeline compared with the carbon steel pipeline?
Thanks,
Dylan
What is the cost of this pipeline compared with the carbon steel pipeline?
Thanks,
Dylan





RE: Pipe material
Most of these cost considerably more than mild steel.
What are you using it for?
RE: Pipe material
Thanks for responding. I'm building a school project for LNG regassification. In this process, we'd use sea water to heat the liquid methane up.
Dylan
RE: Pipe material
I am assuming that you're a teacher or instructor looking for help with your job related project rather than a student.
respectfully
RE: Pipe material
I don't know anything about this process but if you are just using it to carry seawater at ambient temp. and pressure then regular PVC from any hardware store would probably be your cheapest method.
Again, I don't know anything about how the pipe comes into contact if at all with the LNG or what happens during the interaction period so it might not be suitable for that area of the process.
Paul.
RE: Pipe material
Personally, I strongly recommend use of CuNi for seawatwer service systems. Not sure if there are any issues with CuNi and LNG, though.
RE: Pipe material
If it was just seawater I'd agree that CuNi is the material to use (again without knowing LNG limitations) but velocities in CuNi should be limited based on pipe size to avoid turbulence/erosion. Even backing rings are avoided.
RE: Pipe material
RE: Pipe material
DYV
RE: Pipe material
High density polyethylene has been used in Hawaii for years (e.g., a 13,000+ GPM PE pipe, 1 meter diameter, since 1988) to bring deep cold seawater to the surface for cooling.
http://www.makai.com/p-abstracts.htm
Other 55-inch diameter PE pipes used for aquaculture. Some armouring required for the surf zone.
http://www.makai.com/p-aquaculture.htm
http://www.polymoldproducts.com/PE_PIPES.htm
http://www.oxfordplasticsinc.com/marine.htm
For a 25-million gallon per day (mgd) seawater facility, such as the Tampa Bay desalination plant:
"High-density polyethylene (HDPE) was used in the Tampa plant for the 48-inch raw seawater intake piping and the 54-inch concentrate disposal piping due to the water's salinity/ chloride level and relatively low pressures in the systems."
http://w
Even PE as a Dredge Pipe Material:
http://www.oxfordplasticsinc.com/marine.htm
RE: Pipe material
the answer is GRP or any other GRP like materials. Currently we are using it onboard of our vessels for ballast systems. On the other hand, while designing a pipling converying high conductive liquids, you should consider corrosion. Sometimes even SS is not a good solution for such systems, therefore all the system and the envoirement around the piping is also important, sometimes even the gasket we use. For more info please google "Corrosion Control"
GOKHAN
Naval Arc.& Marine Eng.