Can 3 Schedule 80S Pipe Exceed 262 Barg at 100°C According to ASME B31.3?

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SUMMARY

The maximum working pressure for 3" diameter Schedule 80S piping at 100°C is 262 Barg, as per ASME B31.3 guidelines. Exceeding this pressure requires careful consideration of material specifications, wall tolerances, and adherence to the equations outlined in ASME B31.3, paragraph 304.1.2. Modifications such as threading or welding will reduce the pressure rating. The safety factors for design are typically 1.5 for yield strength and 3.5 for ultimate strength.

PREREQUISITES
  • Understanding of ASME B31.3 piping standards
  • Knowledge of ASTM material specifications and grades
  • Familiarity with pressure rating calculations for piping
  • Awareness of the impact of modifications on pressure ratings
NEXT STEPS
  • Review ASME B31.3, paragraph 304.1.2 for design pressure equations
  • Study ASTM material specifications relevant to Schedule 80S piping
  • Learn about the effects of wall tolerance on pressure ratings
  • Investigate the implications of threading and welding on pipe integrity
USEFUL FOR

Engineers, piping designers, and safety compliance professionals involved in the design and assessment of piping systems under ASME B31.3 standards.

alandone
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What is the maximum working pressure of 3" diameter schedule 80S piping at an operating temperature of 100 deg celsius.
According to my piping tables it is 262 Barg, ,but i want to know if this pressure can be exceeded and still comply with ASME B31.3
Also what is the safety factor in the design.
 
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What material?
 
Hi alandone. In order to determine design pressure for a pipe, you have to identify the material (including ASTM spec and grade), figure out the wall tolerance (usually 12%) and a few other things, then go to one of the 3 equations given in ASME B31.3, para. 304.1.2. Note that if you thread the pipe or cut holes/weld on it, that changes the pressure rating (reduces it). So the values given in para 304.1.2 are only for straight pipe, butt welded or socket weld.

Regarding safety factor, it's generally 1.5 to yield and 3.5 to ultimate.
 

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