A suction pipe is installed on the inlet side of a pump system, where it carries liquid from a source such as a tank, borehole, river, or reservoir into the pump. A 3-inch size refers to the diameter of the pipe, which affects the flow rate it can handle.
Key features
Diameter: 3 inches (≈ 75–76 mm internal diameter)
Function: Transfers water or other fluids into a pump under suction (negative pressure)
Material: Commonly made from:
PVC (rigid or reinforced)
HDPE (high-density polyethylene)
Rubber suction hose with wire reinforcement (for flexibility)
Reinforcement: Often has a spiral wire or rigid structure to prevent collapsing under vacuum pressure
Pressure rating: Designed to withstand vacuum conditions rather than high internal pressure