1. What is Unit Weight of Hollow Square Pipe?

Definition: This calculator determines the weight per unit length of a hollow square pipe based on material density and dimensions.

Purpose: It helps engineers, architects, and construction professionals estimate the weight of hollow square pipes for structural calculations and material planning.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Weight per unit length (kg/m)
• \( \rho \) — Material density (kg/m³)
• \( a \) — Outer side length (meters)
• \( b \) — Inner side length (meters)

Explanation: The formula calculates the cross-sectional area (outer area minus inner area) and multiplies by material density to get weight per meter.

3. Importance of Unit Weight Calculation

Details: Knowing the unit weight is essential for structural design, load calculations, transportation planning, and cost estimation.

4. Using the Calculator

Tips:

• Enter material density (default 7850 kg/m³ for steel)
• Provide outer and inner side lengths in meters
• Inner length must be less than outer length
• For solid square bars, set inner length to 0

5. Frequently Asked Questions (FAQ)

Q1: What's the typical density for steel pipes?
A: Mild steel has a density of about 7850 kg/m³. Stainless steel ranges from 7480-8000 kg/m³ depending on grade.

Q2: How do I convert the result to pounds per foot?
A: Multiply kg/m by 0.671969 to get lb/ft.

Q3: What if my pipe is rectangular rather than square?
A: Use the formula W = ρ × (a×c - b×d) where a,c are outer dimensions and b,d are inner dimensions.

Q4: Why is the inner dimension squared in the formula?
A: The formula calculates the cross-sectional area, which for square pipes is outer area (a²) minus inner area (b²).

Q5: How accurate is this calculation?
A: It provides theoretical weight. Actual weight may vary slightly due to manufacturing tolerances and material variations.

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