Piping Piping Materials and Specifications

Question 1

What does the ASTM designation 'A106 Grade B' specify for pipe?

Accepted Answer

Seamless carbon steel pipe for high-temperature service

Answer

Stainless steel seamless pipe for cryogenic service

Answer

Electric-resistance welded carbon steel pipe for general service

Answer

Chrome-moly alloy pipe for boiler applications

Question 2

What is the primary advantage of using austenitic stainless steel (e.g., 316L) over carbon steel in piping?

Accepted Answer

Superior corrosion resistance, especially in chloride and acidic environments

Answer

Higher tensile strength at all temperatures

Answer

Lower cost per foot

Answer

Greater resistance to hydrogen embrittlement

Question 3

What is the purpose of the ANSI/ASME pipe schedule number system?

Accepted Answer

To indicate the pipe wall thickness relative to the outside diameter

Answer

To identify the pipe material grade

Answer

To classify the pipe's pressure-temperature rating class

Answer

To specify the pipe end preparation type

Question 4

What does 'NPS' stand for in pipe specifications?

Accepted Answer

Nominal Pipe Size

Answer

National Pipe Standard

Answer

Net Pressure Specification

Answer

Non-Pressure Service

Question 5

Which material is preferred for piping in hydrogen service to minimize hydrogen embrittlement?

Accepted Answer

Austenitic stainless steel or specially treated low-alloy steel per Nelson curves

Answer

High-carbon steel

Answer

Cast iron

Answer

Pure aluminum

Question 6

What is the primary use of chrome-moly (Cr-Mo) alloy piping such as P91?

Accepted Answer

High-temperature, high-pressure service in power and refinery applications

Answer

Cryogenic service below -100°F

Answer

Chloride-containing corrosive service

Answer

Underground buried piping