Geometric Tolerance of Steel Silo Requirements - Part 2

Appearance Quality Requirements of Steel Silo

1. Guardrail shall not have obvious deformation.
2. The surface of silo shall be smooth without serious convex-concave.
3. For galvanized steel silo, galvanized layer shall be relatively complete without the large area off.

Geometric Tolerance of Silo Requirements

• Diameter tolerance of silo shall be not more than ±5‰ of that according to its design size. (≤±100mm)
• Ovality tolerance of silo shall be not more than ±5‰ of diameter of that according to its design size. For liquid container, Ovality tolerance of silo shall meet requirements in Table 1 below according to its diameter.

  Diameter (D)	Tolerance
  D≤15m	≤75mm
  15m＜D≤25m	≤125mm
  D＞25m	≤150mm

• Vertical tolerance of silo shall be not more than ±5‰ of height of that according to its design size. (≤±50mm). For liquid container, if height to diameter ratio of silo is less than 1.2, perpendicularity may not be inspected.
• Height tolerance of silo shall be not more than ±3‰ of height of stiffener according to its design size.
• Vertical tolerance of stiffener shall be not more than ±2‰ of height of that according to its design size.