If a sea water-cooled shell-and-tube lubricating oil cooler has the sea water inlet and outlet connections on the opposite end waterboxes, in terms of the number of passes, what statement is true?
• Shell-and-tube heat exchanger flow paths (tube-side vs shell-side) • How waterbox location and inlet/outlet positions relate to number of passes • Difference between single-pass and multi-pass (2- or 4-pass) tube arrangements
• Picture the tube bundle: if seawater enters one end waterbox and leaves from the other end waterbox, how many times does it realistically travel the length of the tubes? • For a 2‑pass or 4‑pass exchanger, where would the inlet and outlet typically be located, and what must be inside the waterbox to make the fluid turn around? • Ask yourself: can the flow be 2‑ or 4‑pass if there is no return path on the same end waterbox?
• Confirm which side of the cooler normally carries seawater (tube side vs shell side) in a typical lube oil cooler setup. • Check how a pass partition (baffle) inside a waterbox forces the fluid to change direction and create multiple passes. • Verify whether having inlet and outlet on opposite end waterboxes is consistent with 2‑pass or 4‑pass designs, or with a straight-through, single-pass pattern.
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