Tubing Wall Thickness Calculator

Wall Thickness Formula:

\[ t = \frac{P \times D}{2 \times S \times E} \]

Internal Pressure (P):

Outer Diameter (D):

Allowable Stress (S):

Joint Efficiency (E):

Wall Thickness (t):

1. What is a Tubing Wall Thickness Calculator?

Definition: This calculator determines the minimum required wall thickness for tubing based on internal pressure, diameter, material stress limits, and joint efficiency.

Purpose: It helps engineers and designers ensure tubing can safely withstand internal pressures without failure.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ t = \frac{P \times D}{2 \times S \times E} \]

Where:

\( t \) — Wall thickness (meters)
\( P \) — Internal pressure (Pascals)
\( D \) — Outer diameter (meters)
\( S \) — Allowable stress (Pascals)
\( E \) — Joint efficiency (0-1)

Explanation: The formula calculates the minimum thickness needed to prevent hoop stress from exceeding material limits.

3. Importance of Wall Thickness Calculation

Details: Proper wall thickness ensures structural integrity, prevents rupture, and meets safety standards while minimizing material costs.

4. Using the Calculator

Tips: Enter pressure in Pascals, diameter in meters, allowable stress in Pascals, and joint efficiency (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is joint efficiency?
A: A factor (0-1) accounting for weld quality, with 1 being perfect and typical values 0.7-0.95.

Q2: How do I determine allowable stress?
A: Check material specifications or engineering standards for yield strength with safety factors applied.

Q3: Does this account for external pressure?
A: No, this formula is for internal pressure only. External pressure requires different calculations.

Q4: What about temperature effects?
A: For high-temperature applications, use material properties at operating temperature.

Q5: Should I add corrosion allowance?
A: Yes, add additional thickness beyond the calculated minimum if corrosion is expected.