Steamfitter Technical Standards and Specifications 2

Question 1

According to ASME B31.1, what is the minimum required wall thickness formula component that accounts for manufacturing tolerances?

Accepted Answer

Mill tolerance (y)

Answer

ASME B31.1 requires adding a mill tolerance (typically 12.5% of nominal wall) to account for manufacturing variations when calculating minimum required wall thickness.

Question 2

Which ASTM specification covers seamless and welded black and hot-dipped zinc-coated (galvanized) steel pipe for ordinary use?

Accepted Answer

ASTM A53

Answer

ASTM A53 covers seamless and welded black and hot-dipped galvanized steel pipe for ordinary use in steam, water, gas, and air service.

Question 3

What does the 'Schedule' number of a pipe indicate?

Accepted Answer

The approximate value of 1000 times the ratio of working pressure to allowable stress

Answer

Schedule number approximates 1000 times the ratio of the internal working pressure to the allowable fiber stress, providing a standardized measure of wall thickness.

Question 4

Under ASME B31.3 Process Piping, what category applies to piping that is highly toxic or flammable and could cause irreversible harm?

Accepted Answer

Category M

Answer

Category M (lethal service) under ASME B31.3 applies to fluids that are so toxic or flammable that even a small leak could cause serious harm to personnel.

Question 5

When threading pipe per ANSI/ASME B1.20.1, what taper rate is specified for NPT threads?

Accepted Answer

1/16 inch per inch

Answer

NPT (National Pipe Taper) threads per ANSI/ASME B1.20.1 have a taper of 1/16 inch per inch (or 3/4 inch per foot) of thread length.

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

Steamfitter Technical Standards and Specifications 2