What the (I) in a Pipeline Pump Model Means: Double the Flow

The (I) marks a higher-flow version of the same frame. It keeps the port size and the nominal impeller diameter, and roughly doubles the rated flow at the same head.

When to choose (I)

• The duty needs more flow than the standard frame gives but you want to keep the pipe size
• Efficiency matters: the (I) builds in our table are generally more efficient at their rated point

When not to

If the flow you need is close to the standard build’s rating, the (I) version would run far to the left of its best point. Match the rated flow to your duty, not just the port size.