Calculators›Percent SMYS
💪

Percent SMYS

Yield Strength · Operating Stress · Safety Margin

Advertisement
Percent SMYS Calculator
Calculates operating stress as percentage of Specified Minimum Yield Strength per ASME B31.8 for integrity management. Identifies high-stress locations requiring increased inspection per pipeline safety regulations.
Calculation Mode:

Calculate % SMYS

psig
in

Pipe Specifications

in
psi

Advanced Factors

Note: Joint factor (E) and temperature factor (T) are typically 1.0 for most applications. Adjust only if required by specific design conditions.

📚 Learn the Theory

Understand percent smys principles, calculations, and industry applications

Read Engineering Guide →

Formula (ASME B31.8)

P = (2 × S × t × F × E × T) / D
P = Yield Pressure (psi)
S = SMYS (psi)
t = Wall Thickness (in)
F = Design Factor
E = Joint Factor
T = Temperature Factor
D = Outside Diameter (in)
% SMYS Calculation:
% SMYS = (Operating Pressure / Yield Pressure) × 100

Important Notes

  • % SMYS is a critical factor in pipeline design and integrity management.
  • Operating stress should always be below 100% SMYS.
  • Design factor (F) is applied to SMYS to determine maximum allowable operating pressure (MAOP).
  • Joint factor (E) accounts for weld seam efficiency: 1.0 for seamless, typically 0.8-1.0 for welded pipe.
  • Temperature factor (T) derates strength at elevated temperatures per ASME B31.8.
  • This calculation is for internal pressure only; external loads also affect stress.
Advertisement

Standards & References

  • ASME B31.8
    Gas Transmission Piping Systems
  • 49 CFR Part 192
    Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards
  • API 5L
    Specification for Line Pipe
Advertisement

Related Calculators

💪

Hoop Stress

Calculate pipe hoop stress
📈

MAOP

Determine Maximum Allowable Operating Pressure
📊

Pressure Ratings

Determine pipe pressure ratings
🔬

Material Selection

Guidance on pipe material selection