Titanium spools connecting to Heat Exchanger

[shaff]

Hey guys,

Heat exchager is using seawater for cooling purpose. The which connect to the HE nozzles are of TITANIUM material. Then it continues as CS with serr glass flake lining inside.

My question is why the TITANIUM spools in between, why not glass lined CS pipes all along?

Also, I will be greatful if someone can share any useful information about "serrated glass flake lining" for CS piping

Thanks in advance

Shaff

 

[gr2vessels]

If I correctly understand, the exchanger nozzles are made of Titanium. That's quite common in seawater service.
If the channel or shell is titanium lined or cladded, the nozzles must be also made of titanium or lined with titanium. That is mainly for extended service life for the exchanger.
The connecting pipe needs only corrosion/erosion resistance, which can easily be achieved with suitable paint with glass flake addition. I assume your serrated glass flake lining is an epoxy paint with glass flakes. However, I might be wrong, since I never heard of 'serrated glass flake lining'. Can you give us some details of the brand, manufacturer, any additional info?
Cheers,
gr2vessels

 

[Ripz]

Is it a Shell and Tube exchanger or Plate Exchanger?

You're saying the nozzles are titanium but the attachment piping are internally coated CS?

....

They would have used the Coated CS pipe instead of Ti, due to cost considerations. They would have used the Ti nozzles and not coated CS nozzles on the exchanger so as to ensure failure are unlikely. It is a lot easier and less bureaucratic to repair piping failures than vessels, in this low-risk application.