Connecting To Old 3/4" Copper Pipe That's Smaller Than Usual

[aaf]

Hi,

I'm trying to connect 3/4" copper to 22mm copper in an old house. However it appears that the 3/4" is actually slightly smaller (measured at 21.1mm) than it normally is. This means I've been unable to use the special 3/4 to 22mm compression fittings as the olive is just too loose. Similarly I have a 3/4 to 22mm solder fitting, but that's too loose for the solder as well.

Anybody come across this situation and have any tricks?

Thanks!

 

[kidgreen61]

You can easily buy 3/4" olives, that will solve your prob.

 

[gas112]

You can easily buy 3/4" olives, that will solve your prob.

he already has a 3/4 olive in the fitting

 

[CBW]

Are you sure it’s copper pipe?

 

[gas112]

have you actually tried tightening the fitting on and compressing the olive onto the pipe ?

 

[aaf]

Hi, Thanks for the response, but I've tried that. As I explained the 3/4" pipe is smaller than normal and the 3/4" olives are too loose.

Usually a 3/4" pipe is about 21.5mm (external), mine are 21.1mm.

I'm thinking about swaging it. But I'd have to buy a swaging tool, heat treat the pipe to make it less hard and do it all in-situ. Bit of a pain.

 

[aaf]

CBW - Yes.

gas112 - Yes.

 

[gas112]

if its brass olives your using sometimes they wont compress enough it could be worth trying 3/4 copper olives. even with your pipe being smaller

 

[aaf]

I think they are copper. But I'll check. Good idea!