Ventpipe used for supply to pump?

[Benny_the_ball-valve]

A friend has given me the keys to his property in order that I could chang a leaking stopcock whilst he is away on holiday. This is on a cw cistern in an attic. One thing I noticed was that the HW vent pipe had what looked like a wastevalve (without ring) attached to the end with another section of 22mm copperppipe connected so that it was two or three inches below the surface of the water. Matey had a shower pump fitted under his bath two or three years ago. It would appear that the installer has used the vent pipe as the cold input to the pump. Any ideas as to why he has done this? If so, what problems could this lead to? Cheers.

 

[wetshoes]

Can you post a picture ?

 

[seco services]

wouldn't say its a feed to the pump.
shower pumps don't suck water they only pump.

more like the vent pipe was drawing in air so he placed it below water level.
due to a badly installed shower pump pipework.

 

[Benny_the_ball-valve]

Can you post a picture ?

Sorry, I did not have a camera when I was doing the job.

more like the vent pipe was drawing in air so he placed it below water level.
due to a badly installed shower pump pipework.

Thanks for the comments. How might the pump be (wrongly) installed in order that the vent pipe was drawing in air? Would this this setup be likely to give rise to problems in the future?

 

[Boilerman2]

Pump should take hot water from the cylinder via a surrey or essex flange and not simply tees into the hotwater outlet, as this can cause aire to be sucked down the OV pipe, this is why it has been extended below the water line in the CWS tank, the problem should be properly rectified

 

[transam]

Is the fitting on the vent pipe a N.R.V ???

 

[Benny_the_ball-valve]

Pump should take hot water from the cylinder via a surrey or essex flange and not simply tees into the hotwater outlet, as this can cause aire to be sucked down the OV pipe, this is why it has been extended below the water line in the CWS tank, the problem should be properly rectified

Right. Well the HW cylinder is in another room and, therefore, quite a distance from the bath, so no doubt it would have entailed a lot of work to instal the pump with a dedicated supply. I will mention this to my mate but I have not heard that the pump is performing incorrectly. Cheers.

Is the fitting on the vent pipe a N.R.V ???

Stupidly, I did not look closely at this item - it was a bit tricky to get to that side of the cw cistern. I described it as a waste valve without the ring but perhaps it is an NRV. I will try to take another look at the cistern soon. Thanks alot.