Required Plate Thickness for Dimple Jacket Calculator

Required Thickness Formula:

\[ t_j = P_{max} \times \sqrt{\frac{p_j}{3 \times f_j}} \]

Maximum Pitch between Weld Lines:

Design Jacket Pressure:

N/mm²

Allowable Stress:

N/mm²

Manufacturing Tolerance:

Required Thickness (min): mm

With Tolerance (±5%): mm

1. What is Required Plate Thickness for Dimple Jacket?

Definition: This calculator determines the minimum required thickness of a dimple jacket plate based on weld pitch, design pressure, and material stress limits.

Purpose: It helps engineers design pressure vessels and heat exchangers with dimpled jackets that can withstand operational pressures.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ t_j = P_{max} \times \sqrt{\frac{p_j}{3 \times f_j}} \]

Where:

\( t_j \) — Required jacket thickness (mm)
\( P_{max} \) — Maximum pitch between weld centerlines (mm)
\( p_j \) — Design jacket pressure (N/mm²)
\( f_j \) — Allowable stress for jacket material (N/mm²)

Explanation: The formula calculates the minimum thickness needed to withstand the pressure between support welds, considering material strength.

3. Importance of Accurate Calculation

Details: Proper thickness calculation ensures pressure vessel safety, prevents material failure, and meets engineering standards.

4. Using the Calculator

Tips: Enter the maximum weld pitch, design pressure, allowable stress, and manufacturing tolerance (default ±5%). All values must be > 0 except tolerance which can be negative.

5. Frequently Asked Questions (FAQ)

Q1: What is a dimple jacket?
A: A dimple jacket is a type of vessel jacket with regularly spaced dimples that create flow channels for heat transfer fluids.

Q2: Why include manufacturing tolerance?
A: Tolerance accounts for thickness variations during manufacturing. ±5% is typical unless specified otherwise.

Q3: How is maximum weld pitch determined?
A: It's based on the dimple pattern design and pressure requirements, typically specified in engineering drawings.

Q4: What affects allowable stress value?
A: Material type, temperature, and safety factors all influence the allowable stress value.

Q5: Can this calculator be used for other jacket types?
A: No, this formula is specific to dimple jacket design. Other jackets require different calculations.