1. Pump
Figure 28: Incorrect Piping Arrangement
4.8 Suction Piping Design for Large Pumps
Large units taking their suction supply from sumps require special attention. A properly designed sump is
a must. The larger the unit, the more important these considerations become. A 3000 GPM pump should
be considered a large unit.
The following sketches will show the preferred pipe arrangement within the sump. Pipe should be located
near the back wall of the sump as shown in image below and should not be subjected to rapid changes
in direction of the flow pattern.
V
e
= 1fps or less
S = 1-1/2 to 2D
Figure 29: Recommended Pipe Arrangement
V
e
= 2fps and up
If A = less than 8D
Figure 30: Not Recommended
Add wall thickness to centerline distance round or ogive wall ends. Gap at rear of wall appx. D/3
Figure 31: Recommended
4.8 Suction Piping Design for Large Pumps
3175 Installation, Operation and Maintenance Instructions
27
