API 570's guidance on vibration control requires guides to be checked to ensure they do not do what?

API 570's guidance on vibration control requires guides to be checked to ensure they do not do what?

• A. Block insulation
• B. Restrict thermal expansion
• C. Increase wear
• D. Create noise

Answer: (B)

Vibration control guides are meant to let piping move with temperature changes and dynamic forces rather than pinning it in place. API 570 requires these guides to be checked so they do not restrict thermal expansion. When a guide binds or is too tight, the pipe can’t expand or contract as it heats or cools, which creates excessive bending moments, misalignment, and higher cyclic stresses. This accelerates wear at supports, can lead to fatigue failures, and worsens vibration issues overall. The emphasis is on avoiding any restraint on expansion; other potential issues like insulation blocking, extra wear, or noise may arise secondarily, but they are not the primary concern addressed by the vibration-control guidance.

Vibration control guides are meant to let piping move with temperature changes and dynamic forces rather than pinning it in place. API 570 requires these guides to be checked so they do not restrict thermal expansion. When a guide binds or is too tight, the pipe can’t expand or contract as it heats or cools, which creates excessive bending moments, misalignment, and higher cyclic stresses. This accelerates wear at supports, can lead to fatigue failures, and worsens vibration issues overall. The emphasis is on avoiding any restraint on expansion; other potential issues like insulation blocking, extra wear, or noise may arise secondarily, but they are not the primary concern addressed by the vibration-control guidance.