District cooling

[kumar243]

hi all,how many air changes are recomended for pipe lay off[cool water line]to prevent the pipes from rusting?

[Sandro Baptista]

Welcome kumar.

About your post I don't know and never heard about it? what kind of pipe?

[kumar243]

Thanks for reply. I mean, supply return chilled water
pipes.now the project will stopped for more then 1 year.so i need some solution for prevent?[chilled water pipes already installed lenth 9 km]

[Sandro Baptista]

I wouldn't put air on it but rather charged with nitrogen to remove all oxygen...so no chemical reacting with the residual water and with the iron could occur.

[kumar243]

Thanks, but pipe lenth is 9 km[supply and return is 18 km].so,we cant give nitrogen continusly. So we are disguss dehumidifier.but they are asked 100 air changes.we are normally use for smoking room 15 air changes.so ???

[chemi-cool]

Have you ran water in the pipes yet?

Is one end higher?

If there are water inside, can you empty it completely?

[Toosh]

Thanks for reply. I mean, supply return chilled water
pipes.now the project will stopped for more then 1 year.so i need some solution for prevent?[chilled water pipes already installed lenth 9 km]

Is there cathodic protection in the lines

[Sandro Baptista]

Thanks, but pipe lenth is 9 km[supply and return is 18 km].so,we cant give nitrogen continusly. So we are disguss dehumidifier.but they are asked 100 air changes.we are normally use for smoking room 15 air changes.so ???

I may be not understand quite well...if your pipe is closed/stopped you only need to full one time. You don't need to pressurize the pipes and the nitrogen is cheap.