📐 Pipe Support Span (ASME B31)
Determine maximum allowable pipe span and support spacing based on sag deflection limits (2.5 mm) and ASME B31 allowable bending stress.
⚡ Fortran 90 Engine
Double Precision (IEEE 754)
✓ ISO / ASME Validated
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📦 Code Fortran
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📅 Mise en service
Jun 2026
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📐 Multi-Span Continuous Pipe Deflection & Support Stanchions
Real-time visual simulation of elastic beam sag under gravity & insulation weight📝 Configuration & Presets
ASME B31 Span Formulations:
• Total Weight: w = wpipe + wfluid + wins [N/m]
• Deflection Limit: Lδ = [ (384 E I δallow) / (5 w) ]¼
• Stress Limit: Lσ = √[ (8 Z Sallow) / w ], with Sallow ≤ 0.23 Sh
• Maximum Allowable Span: Lmax = min(Lδ, Lσ)
• Total Weight: w = wpipe + wfluid + wins [N/m]
• Deflection Limit: Lδ = [ (384 E I δallow) / (5 w) ]¼
• Stress Limit: Lσ = √[ (8 Z Sallow) / w ], with Sallow ≤ 0.23 Sh
• Maximum Allowable Span: Lmax = min(Lδ, Lσ)
📊 Pipe Span Results
Configure inputs and click Compute to view results.
📘 Calculation Methodology & ASME Standards
Deflection Limit Criterion
To prevent liquid pocketing, condensate pooling, and excessive slope distortions in drainage lines, sag is restricted to $2.54\,\text{mm}$ ($0.1\,\text{in}$):
Lδ = [ (384 E I δallow) / (5 w) ]¼
ASME B31 Sustained Bending Stress
Weight bending stress is allocated a budget $S_b \le 0.23 S_h$ to preserve allowable stress margin for internal pressure and thermal expansion.
Key Engineering Assumptions
- Uniform continuous multi-span beam behavior with simple supports.
- Combined weight includes pipe steel, fluid contents, and insulation jacket.
- No concentrated heavy valves at midpoint (if present, span should be reduced by 30–40%).