Weko
Materials
- Feb 28, 2011
- 48
Dear All,
I would like to know the mechanism how Cement Linning protect Carbon Steel from seawater corrosion. As I know, cement should have porosity. And through year the chloride content in the porosity will rise up, accelarating the corrosion? So what would be the estimated deign life time of the CS Cement Line piping?
Is Cathodic protection used in the CS Cement Line piping? Recently I've visited an old Exxon Mobile LNG train plant, probably built in the 1970' to 1980'. On the surface of the pipe, they installed a "Rod" and a "Bracelet" (please see picture in the attachment). A vendor told me that the "rod" is used for cathodic protection and the "bracelet" is used to anticipate Thunder striking to the pipe. But I'm still not sure about it. Since nowdays, I don't see those "rod" and "bracelet" installed in the Cement Lined pipe.
And regarding the the cost of Cement Line vs FRP. Which one is cheaper considering the bulk material cost and installation cost. Some said that bulk material, cement line is cheaper. But installation cost is higher, which come fromhandling of the cement line pipe would be difficult, since the cement line tends to crack if the handling sub-contractor / vendor is not good.
Thank you
Regards,
Weko Abhinimpuno
I would like to know the mechanism how Cement Linning protect Carbon Steel from seawater corrosion. As I know, cement should have porosity. And through year the chloride content in the porosity will rise up, accelarating the corrosion? So what would be the estimated deign life time of the CS Cement Line piping?
Is Cathodic protection used in the CS Cement Line piping? Recently I've visited an old Exxon Mobile LNG train plant, probably built in the 1970' to 1980'. On the surface of the pipe, they installed a "Rod" and a "Bracelet" (please see picture in the attachment). A vendor told me that the "rod" is used for cathodic protection and the "bracelet" is used to anticipate Thunder striking to the pipe. But I'm still not sure about it. Since nowdays, I don't see those "rod" and "bracelet" installed in the Cement Lined pipe.
And regarding the the cost of Cement Line vs FRP. Which one is cheaper considering the bulk material cost and installation cost. Some said that bulk material, cement line is cheaper. But installation cost is higher, which come fromhandling of the cement line pipe would be difficult, since the cement line tends to crack if the handling sub-contractor / vendor is not good.
Thank you
Regards,
Weko Abhinimpuno