Piping Piping Materials and Specifications 2

Question 1

What does ASTM A312 specify?

Accepted Answer

Seamless and welded austenitic stainless steel pipes

Answer

ASTM A312 covers seamless, straight-seam welded, and heavily cold worked austenitic stainless steel pipe for high-temperature and corrosion service.

Question 2

What is the purpose of a material test report (MTR) or mill certificate?

Accepted Answer

To document the chemical composition and mechanical properties of a specific heat of pipe or material

Answer

An MTR (mill certificate) is issued by the manufacturer and documents the actual chemical composition and mechanical test results for the specific batch of material supplied.

Question 3

What is Positive Material Identification (PMI) used for in piping?

Accepted Answer

To verify that the correct alloy material is installed using XRF or OES analysis

Answer

PMI uses X-ray fluorescence (XRF) or optical emission spectroscopy (OES) to verify alloy composition of installed piping, preventing carbon steel substitution for alloy pipe.

Question 4

What is the key difference between seamless and electric resistance welded (ERW) pipe?

Accepted Answer

Seamless pipe has no longitudinal weld seam; ERW pipe has a seam weld along its length

Answer

Seamless pipe is extruded or pierced from a solid billet with no weld seam, while ERW pipe is formed from strip steel and welded along one longitudinal seam.

Question 5

What is the purpose of impact testing (Charpy V-notch) for piping materials?

Accepted Answer

To verify adequate toughness and resistance to brittle fracture at low temperatures

Answer

Charpy impact testing measures the energy absorbed by a material during fracture at specified temperatures, verifying adequate toughness for low-temperature service applications.

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Piping Piping Materials and Specifications 2