🔍 Key Concepts

• Study the flow path of the pump casing and note where item J connects relative to suction and discharge. • Think about why a centrifugal pump handling hot water might need a small bypass or recirculation line. • Compare the function of a vent for non‑condensable gases versus a bypass/recirculation line in a closed-loop system.

💭 Think About

• Does item J appear to be a grease point, a vent at the highest point, or a line that would carry liquid from one part of the pump to another? • If this pump were used in a hot-water circulation system, what problem could occur at low flow that a small connection between J and the area at C would help prevent? • Where would non‑condensable gases naturally collect in this pump, and is that where J is located?

✅ Before You Answer

• Verify whether J is located at a bearing or packing (where grease would be used) or in the liquid passage of the pump casing. • Check if C is positioned so that a line from J to C would return liquid from discharge back toward suction, forming a minimum‑flow bypass. • Confirm whether a true gas vent would normally be located at the absolute highest point of the liquid space, and compare that to J’s position.