1. What is the Pressure Calculator (Alleima)?

Definition: This calculator determines the internal pressure capacity of pipes or tubes using Barlow's formula according to Alleima standards.

Purpose: It helps engineers and technicians calculate the maximum allowable working pressure for piping systems.

2. How Does the Calculator Work?

The calculator uses Barlow's formula:

Where:

• \( P \) — Internal pressure (psi)
• \( S \) — Material tensile strength (psi)
• \( t \) — Wall thickness (inches)
• \( D \) — Outside diameter (inches)

Explanation: The formula calculates the pressure at which the hoop stress equals the material's tensile strength.

3. Importance of Pressure Calculation

Details: Accurate pressure calculations ensure piping system safety, prevent failures, and help select appropriate materials for specific pressure requirements.

4. Using the Calculator

Tips: Enter the material's tensile strength in psi, wall thickness in inches, and outside diameter in inches. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is Barlow's formula?
A: A fundamental equation in pipe engineering that relates pressure, dimensions, and material strength.

Q2: What's a typical tensile strength for pipe materials?
A: Varies by material - stainless steel might be 75,000 psi, while carbon steel could be 60,000 psi.

Q3: Should I include a safety factor?
A: This calculator provides theoretical maximum pressure. Always apply appropriate safety factors in actual designs.

Q4: Does this account for temperature effects?
A: No, use material properties at your operating temperature for accurate calculations.

Q5: What units should I use?
A: The calculator uses psi for pressure and strength, inches for dimensions. Convert other units before input.