Historically, the specification on water velocity has been primarily to prevent settling of solids in gravity flow situations. The recommended minimum velocity for sewers is around 2' second which is about 0.6 m/ second. Lower velocities don't make sense unless one is looking at overall demand. You might want to consider the "shower flush syndrome" when one is scalded or frozen with a blast of off temperature water when the system demand hogs all the hot or cold water, as when you are in the shower and the dish washer kicks in and demands hot water, or alternatively when the toilet is flushed when you are showering. It's a question of head losses and demands. Frankly, I'd rather use larger pipe sizes to reduce the fluctuations due to the instataneous demands.
Published by David Russell, President at Global Environmental Operations, Inc
Historically, the specification on water velocity has been primarily to prevent settling of solids in gravity flow situations. The recommended minimum velocity for sewers is around 2' second which is about 0.6 m/ second. Lower velocities don't make sense unless one is looking at overall demand.
You might want to consider the "shower flush syndrome" when one is scalded or frozen with a blast of off temperature water when the system demand hogs all the hot or cold water, as when you are in the shower and the dish washer kicks in and demands hot water, or alternatively when the toilet is flushed when you are showering.
It's a question of head losses and demands. Frankly, I'd rather use larger pipe sizes to reduce the fluctuations due to the instataneous demands.