Trunnion-type lifting lugs for towers are typically positioned at approximately one-third of the tower's height from the top; however, the specific placement must align with the construction contractor's plan and be verified for local structural strength and stability.
Standard Guidelines for Lifting Lug Placement
Trunnion-type lifting lugs are commonly used for tall tower equipment. Standard practice suggests locating them at a height roughly one-third of the way down from the top of the tower. This position helps balance the overall center of gravity during lifting and minimizes the risk of uneven stress distribution across the tower body.
Division of Responsibilities for Design and Construction
The construction contractor is responsible for proposing the lug type, installation location, and structural design, while the manufacturer fabricates and welds the components according to the approved plan. The lifting plan must be prepared by a qualified construction contractor to ensure compliance with safety regulations and equipment load-bearing requirements.
Key Verification Items in Design
In addition to the placement height, two critical parameters require verification:
Lifting lug strength: Including material tensile and shear strength, as well as weld integrity;
Tower wall stability: Local stress in the tower wall surrounding the lug must remain below permissible limits; if necessary, optimization can be achieved by adding reinforcement pads or adjusting the wall thickness.
Collaborative Verification in Practice
The construction contractor, manufacturer, and design unit must jointly review the lug location to ensure it does not interfere with internal components (such as trays or packing) or auxiliary piping layouts, thereby avoiding conflicts between lifting stresses and the equipment's operational functionality.