Water Pump Issue

[egizz983]

Hello i have recently installed a water pump in my house and have an issue some very strange noise you can hear in the video Below from 1:20 minute .
This happens randombly actually not sure what causes but as example you can run the shower in a first minute is nothing and after some time this strange sound starts when you switch off pump it goes off ,and the noise is not pump from the pump itself. also often happens if you run water and then close pump switches off and then this noise kicks in . its seems to be coming from the pipes or somewhere in the bathroom floors starts vibrating . Below i will show how pump is connected and video its self . If anyone can help me to identify what is causing this noise . Pump is new and working as it should both on cold and hot water .

 

[ShaunCorbs]

i could just do one way valve for vent so would not be pulling air if thats the problem

no no no that’s a bomb

 

[ShaunCorbs]

Op please get a pro in before you do something bad

 

[green grant]

i could just do one way valve for vent so would not be pulling air if thats the problem

so replace air with a vacuum LOL not a good idea. You don't have enough water through the cold side (you said it was cold side right!) so you create an operational work around (only use the pump in isolation) or you find a permanent solution. I hate this man but it does show what is needed

 

[egizz983]

so replace air with a vacuum LOL not a good idea. You don't have enough water through the cold side (you said it was cold side right!) so you create an operational work around (only use the pump in isolation) or you find a permanent solution. I hate this man but it does show what is needed

i was looking his video on how to install the pump 😀

 

[egizz983]

Op please get a pro in before you do something bad

in my city plumbers there is no really good plumber they might suggest to replace water cylinder 😀D

 

[green grant]

but he’s boosting both hot and cold

so hot side need a flange else pump will wear quick due to oxygen being pulling in / could air lock

cold side ball valve isn’t rated for mains pressure will have a gravity nozzle in

no no no that’s a bomb

wow, prone to the dramtic are we lol a bomb...how silly are you.

 

[ShaunCorbs]

wow, prone to the dramtic are we lol a bomb...how silly are you.

if he puts a nrv on the vent yes it’s a bomb

 

[green grant]

so replace air with a vacuum LOL not a good idea. You don't have enough water through the cold side (you said it was cold side right!) so you create an operational work around (only use the pump in isolation) or you find a permanent solution. I hate this man but it does show what is needed

if he puts a nrv on the vent yes it’s a bomb

LOL

 

[ShaunCorbs]

 

[green grant]

View attachment 47074

that's a good drawing...

 

[egizz983]

View attachment 47074

Domestic hot water . i dont have that i boost the whole system not only shower taps and toilets ect

 

[green grant]

Domestic hot water . i dont have that i boost the whole system not only shower taps and toilets ect

so ALL cold water feed comes from the tank? So no cold water pipes come off the rising main (into the tank)? If this is the case, then you don't have mains pressure from the header tank at all but you have mains pressure from the hot water tank so there is an immediate imbalance between the 2. Who told you to use that set-up?

 

[egizz983]

so ALL cold water feed comes from the tank? So no cold water pipes come off the rising main (into the tank)? If this is the case, then you don't have mains pressure from the header tank at all but you have mains pressure from the hot water tank so there is an immediate imbalance between the 2. Who told you to use that set-up?

attic tank was feeding both hot water tank and all taps and showers before i installed pump . now attic tank feed hot water tank and pump witch boost attic pressure. its exactly how in this video its just that pump not only for the shower but for all other taps

 

[green grant]

so what was the reason? water flow rates poor or water pressure poor..or both

 

[egizz983]

so what was the reason? water flow rates poor or water pressure poor..or both

new shower cabin with a jets ect and had not enough pressure but was easier and seemed to be more practical to boost whole system then just shower alone

 

[ShaunCorbs]

Can you post a pic of the piping / cylinder cupboard

 

[green grant]

new shower cabin with a jets ect and had not enough pressure but was easier and seemed to be more practical to boost whole system then just shower alone

pressure and flow are not one and the same thing. You can have low pressure and high flow and low flow and high pressure. You have a flow issue right now with the cold water. An increase in pipe diam from the vented, unpressuried tank in the loft to the pump inlet would help. The pump won't be able to physically put more water through but a larger diam pipe reduced into the pump will aid both volume (flow) and add some pressure (force)

 

[egizz983]

Can you post a pic of the piping / cylinder cupboard

i will post tomorrow when i am home

 

[egizz983]

pressure and flow are not one and the same thing. You can have low pressure and high flow and low flow and high pressure. You have a flow issue right now with the cold water. An increase in pipe diam from the vented, unpressuried tank in the loft to the pump inlet would help. The pump won't be able to physically put more water through but a larger diam pipe reduced into the pump will aid both volume (flow) and add some pressure (force)

i am currently have 3/4 pipe feeding pump both cold and hot so you are saying to reduce to 1/2 to ?

 

[green grant]

I was suggesting more like 22 or 28mm into the pump. You really should be doing these as formal mathematical calculations or its just going to be a guess. Start with gathering the data so get a pressure gauge. You need to know what flow/pressure comes into the house (potential to upgrade mains in?) then pressure/flow at different points in the house (this can also give indications as to restrictions and blockages that would otherwise remain unknown) then repeat the tests with other taps/baths/dishwashers/toilets running. Static pressure and initial flow is only one small part, you need to test real world application design