Can i step up from a 1" line to a 1 1/4" line without any major issues?
Yes, No problem
My psi runs between 90 and 110 per the water district.
Do you have a pressure reducing valve (PRV) in your home? If you do, your working pressure is probably 70-75 PSI Normally the water district gives you the pressure that your SHOULD be getting as the water enters your property line. If this is the pressure that you gave your designer, you might want to check the pressure at a hose bibb.
Best case scenario I would be able to connect the main line to what I have now with a step up adapter and run my plans as designed.
Is this a good idea or do I need to alter things so that everything is run off of 1" line and smaller?
Larger pipe will give you better flow rates because you will have better (less) friction loss. That will be negligable on a smaller lot however.
Mick
This post has been edited 1 times, last edit by "Fireguy97" (Sep 5th 2010, 1:21pm)