Compression Slip coupling for 1" female to 22mm copper pipe

[tonyb61]

Hi I'm adding a shower pump to a vented hot water system. I have an unused secondary tapping on the hot water tank, a 1" brass female fitting and I was planning to use this to provide the hot water feed to the adjacent shower pump in 22mm copper. I want to position the end of the copper pipe so it's roughly at the centre of the cylinder to avoid air bubbles from the coil as recommended by the pump manufacturer, so I wonder is it possible to get a compression fitting that screws into the 1" female fitting but allows the 22mm pipe to slide through into the tank while the olive seals the joint at the fitting ? It is a bit like using an essex flange, but avoiding cutting another hole into the cylinder ?

 

[mountainman]

You could file the stop shoulder out of the standard fitting to make a slip fitting.
But why bother, you should only get air problems at the top of the cylinder.

 

[Ray Stafford]

Put a 28mm x 1" MI compression fitting into the female cylinder tapping.

Then get a 28mm x 22mm fitting reducer - the longest tail you can find - and solder about 9" of 22mm tube to the 22mm end, and solder a 28mm socket to the other end. Only seat the reducer about halfway into the 28mm socket. You need to leave as much 28mm fitting exposed as you can, consistent with it not leaking.

Push the 22mm end into the cylinder through the 28mm x 1" compression fitting, and you should be able to tighten the olive onto the exposed bit of the 28 x 22 fitting.

Quicker to do than to describe!

 

[tonyb61]

You could file the stop shoulder out of the standard fitting to make a slip fitting.
But why bother, you should only get air problems at the top of the cylinder.

I'm with you, but according to the pump manufacturer the water coming up from the coil in the cylinder is full of air bubbles which will damage the pump !

 

[tonyb61]

Put a 28mm x 1" MI compression fitting into the female cylinder tapping.

Then get a 28mm x 22mm fitting reducer - the longest tail you can find - and solder about 9" of 22mm tube to the 22mm end, and solder a 28mm socket to the other end. Only seat the reducer about halfway into the 28mm socket. You need to leave as much 28mm fitting exposed as you can, consistent with it not leaking.

Push the 22mm end into the cylinder through the 28mm x 1" compression fitting, and you should be able to tighten the olive onto the exposed bit of the 28 x 22 fitting.

Quicker to do than to describe!

Thanks Ray, it sounds complicated ! Is the reducer an end feed part ? Then the 28mm socket, what is that ?
Thanks
Tony