Which tool is used to verify the integrity of newly installed piping by pulling through during testing?

Which tool is used to verify the integrity of newly installed piping by pulling through during testing?

• A. Caliper
• B. Mandrel that you pull through
• C. Borescope
• D. Pressure gauge

Answer: (B)

During piping installation, you want to confirm the inside of the new pipe is continuous, smooth, and free of obstructions. A go-through mandrel—the tool sized to just exceed the pipe’s interior diameter—is pulled through the pipe during testing. If the mandrel moves through without snagging, it shows there are no dents, burrs, misaligned joints, or debris along the bore that could block flow or cause issues later. This method directly checks the interior passage along the full length, which is why it’s the best choice. Other tools serve different purposes: a caliper measures dimensions at points but can’t verify the entire bore; a borescope provides limited visual inspection rather than ensuring a full-through passage; a pressure gauge assesses pressure and leaks but not the physical smoothness and clearance inside the pipe.

During piping installation, you want to confirm the inside of the new pipe is continuous, smooth, and free of obstructions. A go-through mandrel—the tool sized to just exceed the pipe’s interior diameter—is pulled through the pipe during testing. If the mandrel moves through without snagging, it shows there are no dents, burrs, misaligned joints, or debris along the bore that could block flow or cause issues later. This method directly checks the interior passage along the full length, which is why it’s the best choice. Other tools serve different purposes: a caliper measures dimensions at points but can’t verify the entire bore; a borescope provides limited visual inspection rather than ensuring a full-through passage; a pressure gauge assesses pressure and leaks but not the physical smoothness and clearance inside the pipe.