1" water tap to 1 1/2" line?

[cenc]

Utilities are not my forte. Working in a city that either does a 1" tap or 2". Believe 2" is significantly more than we need, but not sure the 1" is sufficient. Providing water to a park pavilion, about 450' from the main and 20' higher in elevation. The pavilion has 2 urinals, 6 toilets, and two water fountains.

First time doing this, but I calculated this to be equivalent to 28 WSFU's. Believe a 1" good for about 20.

For the fire hydrant where we are tapping, fire department provided static pressure of 75, residual of 50 and then stated flow of 38. Realize need to get flows.

Wondering if the City does a 1" tap and we size up to 1 1/2" for the 450' run or so, if that would be beneficial or not?

Am I on the right track? Any help would be appreciated.

 

[coloeng]

Yes, you are on the right track. For long service line runs we usually recommend that you increase the size of the service line after the meter to reduce head losses. A 1-1/2" or 2" would probably work fine.

When you look at the probability of both urinals, all 6 toilets and the 2 drinking fountains being flushed or used at the same time, your 1" tap should be sufficient.

 

[cenc]

Thank you.

I've tried reading up on pipe sizing and calulations and to date, I think I have confused myself more than anything.

In general, what would be the difference in flow and pressure at the facility between a 1" and 1 1/2"?

 

[cvg]

the tap would be considered a minor loss. the primary head loss is due to friction in the 450 foot long pipe and also due to elevation change.

 

[cenc]

Thanks for the feedback. Will go with the 1 1/2" to the pavilion after the 1" meter.