Pipe Systems and Materials Flashcards
7 cards from real STEAMFITTER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pipe Systems and Materials flashcards as text
What does the schedule number of a pipe (e.g., Schedule 40 or Schedule 80) indicate?
Answer: The pipe's wall thickness relative to its outer diameter
Pipe schedule numbers indicate wall thickness — a higher schedule number means a thicker wall for the same nominal pipe size (NPS).
Which pipe material is most commonly specified for steam distribution systems operating above 300°F?
Answer: Carbon steel
Carbon steel is the standard material for high-temperature steam systems because it maintains strength and integrity well above 300°F, unlike plastics or soft copper.
What does the Nominal Pipe Size (NPS) designation represent?
Answer: An approximate reference dimension historically related to inner diameter
NPS is a nominal (approximate) designation that historically referenced the inner diameter; for NPS 14 and larger, the NPS actually equals the outer diameter in inches.
A steamfitter needs to change the direction of a pipe run by exactly 45 degrees. Which fitting is used?
Answer: 45-degree elbow
A 45-degree elbow changes pipe direction by 45 degrees and is a standard fitting used to offset pipe runs at that angle.
What is the primary purpose of a union fitting in a piping system?
Answer: To allow the piping to be disconnected without cutting
A union allows a section of pipe or component to be easily removed and reconnected by unthreading the union nut, without cutting or unthreading long pipe runs.
Which organization publishes the ASTM standards that specify material requirements for steel pipe used in pressure applications?
Answer: ASTM International
ASTM International publishes pipe material specifications such as ASTM A53 for black and hot-dipped steel pipe and ASTM A106 for seamless carbon steel pipe for high-temperature service.
Which pipe material is typically used for condensate return lines in a steam heating system?
Answer: Black steel pipe
Black steel pipe is standard for condensate return lines because it resists the corrosive nature of hot condensate; galvanized pipe can release zinc into the system and is not recommended for steam service.