Condensate in cast iron pipe

[SA7426]

Hi there

I'm looking to run a 32mm condensate into cast iron with a mcalpine mechanical boss adaptor. I need to make a 57mm hole and was wondering what's the best tool to use for it. The 57mm holesaws I can see say they do sheet metal but will they do the job on cast iron?

Any help will be greatly appreciated.

Thanks

 

[Deleted member 120897]

Although it will dilute, I wouldn’t recommend condensate into cast iron. I’ve had to replace copper wastes for this very reason (Corrosive stuff).

 

[steadyon]

1. A decent bi-metal hole saw (e.g. Starrett) will do it. Run the hole saw slowly - no more than 500 rpm and preferably a good bit less. The outer "skin" of the cast iron may be quite hard, but it is thin, and once through it it the iron is easier to drill than mild steel.
2. Condensate will attack the cast iron, as Undertrained has said. It is very mildly acidic, about the same acidity as Cola, and should have a much slower impact on cast iron than on copper. As long as it goes in below one or more much used connections (WC, bath etc) I wouldn't worry too much about it.

 

[SA7426]

Superb guys thanks

 

[Chuck]

Although it will dilute, I wouldn’t recommend condensate into cast iron. I’ve had to replace copper wastes for this very reason (Corrosive stuff).

OP might want to consider fitting an inline 'condensate neutraliser'.