Piping Piping Codes and Standards

Question 1

Which ASME code governs the design of process piping in chemical and refinery plants in the US?

Accepted Answer

ASME B31.3 — Process Piping

Answer

ASME B31.3 is the governing code for process piping in petroleum refineries, chemical plants, pharmaceutical plants, and related industries.

Question 2

Under ASME B31.3, what is the minimum required hydrotest pressure expressed as a multiple of design pressure?

Accepted Answer

1.5 times the design pressure

Answer

ASME B31.3 requires a hydrostatic leak test at a minimum of 1.5 times the design pressure to verify structural integrity and leak-tightness.

Question 3

What does API 570 cover?

Accepted Answer

Inspection, repair, alteration, and rerating of in-service piping systems

Answer

API 570 is the Piping Inspection Code covering inspection, condition monitoring, repair, alteration, and rerating of metallic and FRP piping systems after initial installation.

Question 4

What is the primary purpose of ASME B16.5?

Accepted Answer

To provide dimensional and pressure-temperature rating standards for pipe flanges and flanged fittings

Answer

ASME B16.5 establishes dimensional standards, materials, and pressure-temperature ratings for steel pipe flanges from Class 150 through Class 2500 in sizes NPS 1/2 through NPS 24.

Question 5

Under ASME B31.3, what is a 'Category D' fluid service?

Accepted Answer

Non-flammable, non-toxic service where design temperature is from -29°C to 186°C and gauge pressure does not exceed 1035 kPa

Answer

Category D is a lower-risk classification in B31.3 for services with limited hazard potential, allowing simplified examination requirements.

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Piping Piping Codes and Standards