Total Compressive Load on Base Ring Calculator

Total Compressive Load Formula:

\[ F_b = \frac{4 \times M_{max}}{\pi \times D_{sk}^2} + \frac{\Sigma W}{\pi \times D_{sk}} \]

Total Compressive Load (N):

1. What is Total Compressive Load on Base Ring?

Definition: This calculation determines the vertical load transmitted from the vessel and its contents to the base ring, considering both bending moments and weight distribution.

Purpose: It helps engineers ensure the structural integrity of pressure vessels and storage tanks by verifying base ring loading.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ F_b = \frac{4 \times M_{max}}{\pi \times D_{sk}^2} + \frac{\Sigma W}{\pi \times D_{sk}} \]

Where:

\( F_b \) — Total compressive load at base ring (N)
\( M_{max} \) — Maximum bending moment (N·m)
\( D_{sk} \) — Mean diameter of skirt (mm)
\( \Sigma W \) — Total weight of vessel with attachments (N)

Explanation: The formula combines the compressive effects from bending moments (first term) and direct weight (second term) distributed around the skirt circumference.

3. Importance of This Calculation

Details: Proper calculation ensures the base ring can support all operational loads including wind, seismic, and internal pressure effects without excessive deformation.

4. Using the Calculator

Tips: Enter the maximum bending moment, mean skirt diameter, and total vessel weight. All values must be > 0. The ±5% indicates typical measurement tolerances.

5. Frequently Asked Questions (FAQ)

Q1: What affects the maximum bending moment?
A: Wind loads, seismic activity, internal pressure, and equipment operation can all contribute to bending moments.

Q2: How is mean skirt diameter determined?
A: It's typically the average of inner and outer diameters at the vessel base.

Q3: What's included in total vessel weight?
A: Include empty vessel weight, contents, insulation, attachments, and any additional loads.

Q4: Why is the result important?
A: It's used to design the base ring thickness, anchor bolts, and foundation to prevent failure.

Q5: How does this relate to safety factors?
A: The calculated load is multiplied by appropriate safety factors (typically 1.5-4) for design.