The fitting required at the bottom of a gravity tank discharge pipe is a/an ________.

The fitting required at the bottom of a gravity tank discharge pipe is a/an ________.

• A. elbow
• B. tee
• C. base elbow
• D. coupling

Answer: (C)

The fitting at the bottom of a gravity tank discharge is a base elbow because it is designed to sit at the tank’s base, providing a proper 90-degree turn from the vertical discharge to the horizontal discharge line while bolting to or sealing against the tank. This keeps the discharge aligned, minimizes stress on the tank, and ensures a secure, leak-proof connection. An ordinary elbow lacks the base mounting/seat needed for a tank outlet; a tee would add an unnecessary branch and complicate drainage, and a coupling would only join pipes in line without directing the flow.

The fitting at the bottom of a gravity tank discharge is a base elbow because it is designed to sit at the tank’s base, providing a proper 90-degree turn from the vertical discharge to the horizontal discharge line while bolting to or sealing against the tank. This keeps the discharge aligned, minimizes stress on the tank, and ensures a secure, leak-proof connection. An ordinary elbow lacks the base mounting/seat needed for a tank outlet; a tee would add an unnecessary branch and complicate drainage, and a coupling would only join pipes in line without directing the flow.