Tower Structures and Inspection Flashcards

What corrosion indicators should be documented during a tower structural inspection?

Answer: Surface rust, pitting, section loss, pack rust at connections, galvanizing failure, and dissimilar metal corrosion

Corrosion in various forms reduces structural member cross-sections and connection integrity.

What is the purpose of a structural analysis when adding new equipment to an existing tower?

Answer: To verify the tower can safely support the additional weight and wind loading without exceeding structural capacity

Every piece of equipment added increases both gravity loading and wind loading. Without analysis, additions may overload the tower.

How should bolt connections be evaluated during a tower inspection?

Answer: Check for proper torque, corrosion, missing nuts or washers, thread engagement, and cracks around bolt holes

Bolted connections are the critical links. Failed connections can cause progressive collapse.

What is a plumb and twist survey and when is it required for a tower?

Answer: It measures the tower's vertical alignment (plumb) and rotational deformation (twist) to detect structural distortion

Plumb and twist measurements detect structural distortion indicating overloading, foundation problems, or damage.

Why is weld inspection important on welded tower structures and components?

Answer: Welds can develop cracks, porosity, and corrosion that reduce structural capacity, especially under cyclic wind loading

Welds are subject to fatigue cracking under cyclic loading from wind, thermal cycling, and vibration.

What documentation should be produced after completing a tower structural inspection?

Answer: A written report with photographs, deficiency ratings, measurements, recommendations, and comparison to previous inspection findings

Comprehensive inspection documentation provides the record needed for engineering evaluation, maintenance planning, and regulatory compliance.