The primary purpose of providing suitable bends in fluid and pneumatic metal tubing runs is to

• A. prevent excessive stress on the tubing
• B. maximize flow
• C. ease future maintenance
• D. reduce production cost

Answer: (A)

Bends are designed to minimize stress on the tubing. When tubing carries fluid or air, a bend with an appropriate radius spreads the bend-related forces over a larger area of the wall, reducing stress concentration that happens at sharp corners. This helps prevent fatigue cracking, leaks, and failure from vibration and pressure changes. Proper bends also accommodate thermal expansion and contraction, keeping the system durable over many cycles. While bends can influence flow resistance, the primary goal is to protect the tubing from excessive stress so the system remains safe and long-lasting. Options suggesting maximizing flow, easing maintenance, or cutting costs aren’t the main purpose of using suitable bends.