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Process Pipes - Allowable Stress vs. Temperature

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Operating temperatures and allowable tension stresses according ASME B31.3 - Process Piping.

Carbon Steel Pipes and Tubes

  • A 53 Pipe, Steel, Black and Hot-Dipped, Zinc Coated, Welded and Seamless
  • A 106 Seamless Carbon Steel Pipe for High-Temperature Service
  • A 135 Standard Specification for Electric-Resistance-Welded Steel Pipe
  • A 333 Seamless and Welded Steel Pipe for Low-Temperature Service
  • A 334 Seamless and Welded Carbon and Alloy-Steel Tubes for Low-Temperature Service
  • A 369 Standard Specification for Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service
  • API 5L Line Pipe

  • 1 psi (lb/in2) = 6895 Pa (N/m2)
  • 1000 psi = 6.9 MPa
  • T(oC) = 5/9[T(oF) - 32]

Example - Allowable Stress - 2000 psi vs. MPa

(20000 psi) (6895 Pa/psi) = 137900000 Pa

               = 138 MPa


Low and Intermediate Alloy Steel Pipes and Tubes

  • A 335 Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
  • A 369 Carbon Steel and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service


Seamless Austenitic Alloys Steel Pipes

  • A 269 Seamless and Welded Austenitic Stainless Steel Tubing for General Service
  • A 312 Seamless and Welded Austenitic Stainless Steel Pipe
  • A 358 Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe for High-Temperature Service

About B31.3 - Process Piping

B31.3 covers design of chemical and petroleum plants and refineries processing chemicals and hydrocarbons, water and steam. This Code contains rules for piping typically found in petroleum refineries; chemical, pharmaceutical, textile, paper, semiconductor, and cryogenic plants; and related processing plants and terminals.

This Code prescribes requirements for materials and components, design, fabrication, assembly, erection, examination, inspection, and testing of piping. This Code applies to piping for all fluids including: (1) raw, intermediate, and finished chemicals; (2) petroleum products; (3) gas, steam, air and water; (4) fluidized solids; (5) refrigerants; and (6) cryogenic fluids. Also included is piping which interconnects pieces or stages within a packaged equipment assembly.

B31.3 - Process Piping and Allowable Stress

For B31.3 Process piping, allowable stress is tensile strength at temperature divided by 3.

Note! for B31.1 - Power piping, allowable stress is tensile strength at temperature divided with 3.5.

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Related Topics

Pressure Ratings of Pipes and Fittings

Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more.

Related Documents

ASME B31.9 Building Services Piping - Working Pressure and Temperature Limits

The working pressure and temperature limits of ASME Code B31.9 - Building Services Piping.

ASTM A270 Sanitary Stainless Steel Tubing - Dimensions

Dimensions of ASTM A270 sanitary steel tubes.

Carbon Steel Pipes - Pressure and Temperature Ratings, Imperial Units

Pressure (psig) and temperature (deg F) ratings for A-53 B and A-106 B, A333, A334 and API 5L carbon steel pipes - temperatures ranging 100 degF - 700 degF.

Carbon Steel Pipes - Pressure and Temperature Ratings, Metric Units

Pressure (kPa)> and temperature (degC) ratings of ASTM A-106, API 5L and ASTM A-53 Seamless Carbon Steel Pipes - temperatures ranging -29 degC - 450 degC.

Stainless Steel Pipes - Allowable Pressure vs. Schedule and Size

Allowable pressure for standard seamless A312-TP316/316L stainless steel pipes - temperatures 100oF to 750oF.

Steel Pipes - De-Rating vs. Temperature

Temperature derating factor for steel pipes.


Stress is force applied on cross-sectional area.

Stress in Thick-Walled Cylinders or Tubes

Radial and tangential stress in thick-walled cylinders or tubes with closed ends - with internal and external pressure.

Stress in Thin-Walled Cylinders or Tubes

Hoop and longitudinal stress thin-walled tubes or cylinders.

Stress, Strain and Young's Modulus

Stress is force per unit area - strain is the deformation of a solid due to stress.

Wrought Steel Pipes - Bursting Pressures vs. Size

Theoretical bursting and working pressure of wrought steel standard, extra strong and double extra strong pipes.

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