Water Pump Again - sorry

[JAS21]

I was around the corner at a friend’s house this morning. Basically he gets very little water upstairs unless the pump is running, whereas my pump at present isn’t even piped up and anyway when it is we don’t use it … just tip some bleach into the tank now and again.  

 

Also his pump a GP Series WT-250GP (Japan made so it says) starts when the kitchen tap is opened BUT runs for perhaps 10secs or more after closing the tap. It does actually discharge more water with the pump running.

 

His house is probably ten years older than ours so wondering if there is a pipe furred up problem … also if the water meter is restricting flow … I don’t have anything to measure pump discharge pressure but can maybe put a hose up to the first floor from the pump and see what happens.

 

We are away in very shortly so I don’t have time to look any further until the end of next week. Maybe the area below the bladder tank wants draining? Also I’ll change his nrv’s when we get back … after that …………………………??

 

Some ideas please …………..

[Crossy]

Get a pressure gauge (Global House have a good assortment) and some adaptors so it fits shower hoses (1/2") and threaded taps (3/4") then you can actually make some measurements rather than guessing.

 

Is he on the same water supply as you? Check your and his pressure, and if it's ok flow rate (calibrated bucket and stopwatch). 

 

Assuming he's pumping directly from the mains (naughty) does he have a pump bypass in place? Is it working?

 

A short over-run (to re-pressurise the tank) is normal.

[Artisi]

Up stairs where, possibly the inline filters in the toilet, shower, hand basin are chocked - as my own supply is very clean, I removed all of them. 

[Fruit Trader]

Its always best to confirm the state of city supply at or near the meter before moving forward. This will greatly reduce the permutations and presumption.

 

Also good to paint a full picture before bringing to the table. EG: It is a convectional city supply with backup tank, pump and isolating non return valve

Edited May 20, 2018 by Fruit Trader

[JAS21]

5 hours ago, Fruit Trader said:

Its always best to confirm the state of city supply at or near the meter before moving forward. This will greatly reduce the permutations and presumption.

 

Also good to paint a full picture before bringing to the table. EG: It is a convectional city supply with backup tank, pump and isolating non return valve

Conventonal set up...as I said I didn't have time to fiddle.

 

There must be a p/p bypass ...see original above.

 

My view is that pump should stop almost immediately...mine does.

 

As my pump is sitting all alone  it would be easy to drop it into his pipework ... he probably has two problems ...buying a PG is a good idea 

 

Filters ... forgot about them ...mine are out

Edited May 20, 2018 by JAS21

[Fruit Trader]

QUOTE
I was around the corner at a friend’s house this morning. Basically he gets very little water upstairs unless the pump is running, whereas my pump at present isn’t even piped up and anyway when it is we don’t use it … just tip some bleach into the tank now and again.

If above is accurate. All is ok when pump runs but his city water is bad and yours is good and the pump delay action is another story.

Like I said earlier, find out what's happening at city water and work forward. If you discover a poor city water supply that cant be fixed then the pump must work to keep the house happy.
  

An example backup only would be pump operating between 2 Bar (turns on) 2.6 Bar (turns off) and good city water maintaining 2.8 Bar on demand. The pump will not operate until the city water is unable to maintain pressure above 2 Bar.

When the pump is in operation, a shut off delay will most likely come from the pump having to fill its pressure tank before eventually reaching off pressure.

 

NOTE - Some setups will have no check valve on pump outlet which places city water pressure on the pumps pressure tank. This can reduce the pump off delay to almost zero.

[VocalNeal]

I must have missed something?

 

He has a pump?

His pump is working correctly?

He has water where he want's it?

 

NB the "tank below" type pumps have internal spring check valves to stop water hammer. The springs do corrode which is why pump shops sell replacement check valve internals.

 

Edited May 21, 2018 by VocalNeal