Thickness of Half Coil Jacket Calculator

Thickness of Half Coil Jacket Formula:

\[ t_{coil} = \frac{p_j \times d_i}{2 \times f_j \times J} + c \]

Design Jacket Pressure:

N/mm²

Internal Diameter of Half Coil:

Allowable Stress for Jacket Material:

N/mm²

Joint Efficiency for Shell:

(0-1)

Corrosion Allowance:

Thickness of Half Coil Jacket: mm

1. What is Thickness of Half Coil Jacket?

Definition: This calculator determines the required thickness for a half coil jacket in pressure vessel design, considering design pressure, material stress, joint efficiency, and corrosion allowance.

Purpose: It helps mechanical engineers and pressure vessel designers ensure proper jacket thickness for safe operation under design conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ t_{coil} = \frac{p_j \times d_i}{2 \times f_j \times J} + c \]

Where:

\( t_{coil} \) — Thickness of half coil jacket (mm)
\( p_j \) — Design jacket pressure (N/mm²)
\( d_i \) — Internal diameter of half coil (mm)
\( f_j \) — Allowable stress for jacket material (N/mm²)
\( J \) — Joint efficiency for shell (0-1)
\( c \) — Corrosion allowance (mm)

Explanation: The formula calculates the minimum required thickness to withstand the design pressure, accounting for material strength and joint efficiency, plus additional thickness for corrosion.

3. Importance of Proper Jacket Thickness

Details: Correct thickness calculation ensures pressure containment, structural integrity, and long-term reliability of the pressure vessel jacket.

4. Using the Calculator

Tips: Enter all required parameters. Default values are provided for common materials. All values must be positive numbers (joint efficiency between 0-1).

5. Frequently Asked Questions (FAQ)

Q1: What is joint efficiency?
A: Joint efficiency (0-1) accounts for the strength reduction at welded joints compared to base material.

Q2: How to determine corrosion allowance?
A: Corrosion allowance depends on material, environment, and expected service life (typically 1-3mm for carbon steel).

Q3: What are typical values for allowable stress?
A: For carbon steel at room temperature, typically 120-140 N/mm², but varies with material and temperature.

Q4: Why is internal diameter important?
A: Larger diameters result in higher hoop stresses, requiring greater thickness for the same pressure.

Q5: Does this include safety factors?
A: The allowable stress value typically already incorporates appropriate safety factors.