3 bar pump piped in 1/2”

Zane97

Would piping a rain shower/s this way give too low pressure even on a 3bar pump?

That’s 1/2” into and exiting the pump.

rightjob!

Robbie G wrote: »

Would piping a rain shower/s this way give too low pressure even on a 3bar pump?

That’s 1/2” into and exiting the pump.

Are the pump connections half or 3/4?
Is it a t-bar shower with rain head or concealed mixer with rain head?

Zane97

rightjob! wrote: »

Are the pump connections half or 3/4?
Is it a t-bar shower with rain head or concealed mixer with rain head?

Pump connection are 3/4” and they would be concealed mixers with rain heads. Pipe work ran into attic.

So last guy has reduced from 3/4” off the cylinder and dropped 1/2” cold down and it’s all entering and exiting ye pump in the way.

Sleeper12

I'd have gone into & out of the pump in 3/4 inch. It's best to get as close as possible to the shower before reducing to half inch

Zane97

Sleeper12 wrote: »

I'd have gone into & out of the pump in 3/4 inch. It's best to get as close as possible to the shower before reducing to half inch

Reckon it would make much of a difference to the pressure if changed to 3/4” before it enters the pump and change the outlets to 3/4” pipe and into the attic?

Tails142

Robbie G wrote: »

Reckon it would make much of a difference to the pressure if changed to 3/4” before it enters the pump and change the outlets to 3/4” pipe and into the attic?

1/2" bends and pipe will have a greater head loss, so the pressure will increase at the outlet if you use a larger pipe, replacing parts of the pipework would have an effect if there are bends and junctions in it, if it's just a straight run it won't have much of an effect.

Do you notice a lot of noise from the pipe when the water is flowing? That would be one of the major benefits of using 3/4" as the water will be traveling quite fast to maintain flow rate using half inch, whereas there is nearly twice as much cross sectional area in three quarter so it doesn't have to travel along the pipe as fast

Zane97

Tails142 wrote: »

1/2" bends and pipe will have a greater head loss, so the pressure will increase at the outlet if you use a larger pipe, replacing parts of the pipework would have an effect if there are bends and junctions in it, if it's just a straight run it won't have much of an effect.

Do you notice a lot of noise from the pipe when the water is flowing? That would be one of the major benefits of using 3/4" as the water will be traveling quite fast to maintain flow rate using half inch, whereas there is nearly twice as much cross sectional area in three quarter so it doesn't have to travel along the pipe as fast

With the pump power off, should I be getting any gravity flow coming out of the showers? I’m getting more off one than the other. One has a straight run, the other is tee’d off the straight run in the attic space.

rightjob!

Robbie G wrote: »

Pump connection are 3/4” and they would be concealed mixers with rain heads. Pipe work ran into attic.

So last guy has reduced from 3/4” off the cylinder and dropped 1/2” cold down and it’s all entering and exiting ye pump in the way.

Would definitely go 3/4 out of the pump then and into the mixer in 3/4.Most concealed mixers are 3/4.

If it was a tbar and not a long run the 1/2 wouldnt have been too bad but still not great.

Dtp1979

rightjob! wrote: »

Would definitely go 3/4 out of the pump then and into the mixer in 3/4.Most concealed mixers are 3/4.

If it was a tbar and not a long run the 1/2 wouldnt have been too bad but still not great.

3/4” reduced to 10mm nearly.
Op, is there dirt or silt at the pump filters or shower filters?
3/4” both sides is ideal but if it’s 1/2” and the pump is dedicated to the shower then I think it’s not going to matter in the slightest. Distance might play a slight factor.

Zane97

Dtp1979 wrote: »

3/4” reduced to 10mm nearly.
Op, is there dirt or silt at the pump filters or shower filters?
3/4” both sides is ideal but if it’s 1/2” and the pump is dedicated to the shower then I think it’s not going to matter in the slightest. Distance might play a slight factor.

There was dirt on the hot inlet. Still hasn’t solved the pressure. Bit of dirt in the shower heads too. Should I be expecting great pressure off a Grundfos stp 3bar given that they are rain heads?

Also, is there filters on the shower units themselves?

Dtp1979

Robbie G wrote: »

There was dirt on the hot inlet. Still hasn’t solved the pressure. Bit of dirt in the shower heads too. Should I be expecting great pressure off a Grundfos stp 3bar given that they are rain heads?

Also, is there filters on the shower units themselves?

If it’s a bar mixer then there should be filters where the shower detaches

Zane97

Dtp1979 wrote: »

If it’s a bar mixer then there should be filters where the shower detaches

No they are concealed showers.

Maybe it’s the shower heads then.

I see some rainheads are rated for more litres per minute than others?

Dtp1979

Robbie G wrote: »

No they are concealed showers.

Maybe it’s the shower heads then.

I see some rainheads are rated for more litres per minute than others?

A 3 bar grundfos shouid give plenty of pressure. How long since you last cleaned the pump washers? They might need cleaning again. Check all 4 hoses in case the installer incorrectly put filter washers on them all.

Zane97

Dtp1979 wrote: »

A 3 bar grundfos shouid give plenty of pressure. How long since you last cleaned the pump washers? They might need cleaning again. Check all 4 hoses in case the installer incorrectly put filter washers on them all.

It’s a brand new install I got done last week. Nah, it’s only filters on the pump inlets.