From my experience with a 4" line and a different 1" line, the 'bump' only needs to be more than the diameter of the pipe to cause an air pocket. Each bump adds up. There's a fair bit about the physics of this on the 'net. So only if you get enough positive pressure will you get flow, and even more pressure to expell the bulk of the air pockets, and then that pressure is no longer needed because you have overcome the air pocket effect.
According to that info. its not a permanent solution because vapour pressure or whatever recreates the air pockets over time. Only permanent solution (other than eliminating the bumps) is to vent them. I had to do that on the 1" line, and eventually adjust the route so that the bumps were so small as to allow flow to continue.
According to that info. its not a permanent solution because vapour pressure or whatever recreates the air pockets over time. Only permanent solution (other than eliminating the bumps) is to vent them. I had to do that on the 1" line, and eventually adjust the route so that the bumps were so small as to allow flow to continue.
