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Minimum Width of Annular Plate Calculator

Minimum Width of Annular Plate Formula:

\[ WAP = x + 300 + H + LLW \]

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% (±5%)
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1. What is Minimum Width of Annular Plate?

Definition: The minimum width of annular plate refers to the smallest thickness that the plate can have while still maintaining structural integrity and sufficient strength for its intended purpose.

Purpose: It ensures the tank has proper support and stability, especially at the base where stresses are highest.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ WAP = x + 300 + H + LLW \]

Where:

  • \( WAP \) — Minimum Width of Annular Plate (mm)
  • \( x \) — Total Extension (mm)
  • \( 300 \) — Standard safety margin (mm)
  • \( H \) — Height of Tank (mm)
  • \( LLW \) — Length of Lap Weld (mm)

Explanation: The formula combines key dimensions with a safety margin to determine the minimum required plate width.

3. Importance of Proper Annular Plate Width

Details: Correct width calculation prevents structural failure, ensures proper load distribution, and maintains tank stability under various operating conditions.

4. Using the Calculator

Tips: Enter all dimensions in millimeters. The tolerance field (default ±5%) allows for manufacturing and installation variations.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a 300mm constant in the formula?
A: This is a standard safety margin to account for uncertainties and provide additional structural integrity.

Q2: How is the tolerance percentage applied?
A: The tolerance is added to the calculated width (e.g., 5% tolerance means the result is 105% of the calculated width).

Q3: What affects the length of lap weld?
A: Weld length depends on material thickness, joint design, and required strength. Consult welding standards for specific applications.

Q4: Can this calculator be used for all tank sizes?
A: While the formula works for most applications, extremely large or specialized tanks may require additional considerations.

Q5: What standards govern annular plate design?
A: API 650 and other international standards provide guidelines for tank bottom annular plate design.

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