# amount of water coming in

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by steveleewonder, Jun 30, 2009.

1. ### steveleewonderNew Member

Joined:
Oct 12, 2008
Hello all...
I have a question on water amount depending on split point.
2inch city water line comes into building, and it splits to another 2inch line(A) by "T" connection, and runs continuously to 2inch water supply line(B).
line "A" has 20 water outlet such as sink, toilets, kichens etc..., and line "B" has 40 water outlets..., "B" water line(group) use(spend) double amount of water than line "A". But sometimes, "B" experience lack of water( pressure drop, amount of water smaller) due to water usage increase in "B" group. my question is if line "B" and "A" swap each other, then it makes any difference on water amount(pressure)? or same? my goal is to improve water shorage situation only in "B" group.
Thanks,

2. ### kingsotallPlunger/TurdPuncher

Joined:
Aug 17, 2008
Occupation:
Hand copper part cleaned ready to go
Location:
Flagstaff, AZ Sitting on an upside down 5 gallon b
Guess I'll take a stab, what's the water pressureÂ¿

4. ### Doherty PlumbingJourneyman & Gas Fitter

Joined:
Jun 22, 2009
Occupation:
Red Seal Journeyman Plumber & Licensed Gas Fitter
Location:
Penticton, BC
How long is the line?

And I'd need to know exactly what kind of fixtures, and how many, are being served.

Then I can tell you if the line is undersized.

Also if the 2" line rises vertically I'd need to know how high it goes because you do have a pressure loss due to the height.

However... assuming the line is undersized you can correct this problem by installing a pressure tank in the system. This will help with the amount of water available and it will also help keep the pressure up.

5. ### hjModerator & Master PlumberStaff Member

Joined:
Aug 31, 2004
Occupation:
Plumber
Location:
Cave Creek, Arizona
line

how would you swap lines A & B? there are too many unknowns to even try to guess how to equalize the pressure

6. ### kingsotallPlunger/TurdPuncher

Joined:
Aug 17, 2008
Occupation:
Hand copper part cleaned ready to go
Location:
Flagstaff, AZ Sitting on an upside down 5 gallon b
Definitely not a topic that equates to a forum. These come around from time to time. Can't quite remember the last one but it was some months ago and on a scale with this one.

7. ### steveleewonderNew Member

Joined:
Oct 12, 2008
40psi under line "B" group....., don't know pressure on line "A", guess same 40psi

8. ### steveleewonderNew Member

Joined:
Oct 12, 2008
I am not asking about "undersized", I am asking if I change line A with Line B, any difference??

9. ### steveleewonderNew Member

Joined:
Oct 12, 2008

cut the two pipes line "A" and "B", about 1' high from split point, then connect them by cross-way( connect previous A's split point(T-connection point) to line "B"'s uppper line, line "A"'s upper line to previous line "A"'s down-portion...), so that line "B" split first, then runs to line "A"

10. ### steveleewonderNew Member

Joined:
Oct 12, 2008
this is new topic and I never asked this kind question.