Technical Standards and Specifications 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 Technical Standards and Specifications flashcards as text
What is the purpose of a 'blow-down' procedure in new steam piping systems before commissioning?
Answer: To flush scale, weld slag, and debris from the piping using high-velocity steam or air
Steam blow-down uses high-velocity steam or air flow to dislodge and remove construction debris, weld scale, and mill scale from new piping before connecting sensitive equipment.
Which ASME standard covers the design and fabrication of power boilers and establishes rules for piping directly connected to the boiler?
Answer: ASME Section I
ASME Boiler and Pressure Vessel Code Section I covers power boilers and includes requirements for piping directly connected to boilers (boiler external piping).
What does the term 'design temperature' mean in the context of ASME B31.1 piping design?
Answer: The temperature at which the pressure-design wall thickness is calculated, based on maximum sustained operating conditions
Design temperature is the temperature used to determine allowable stress for pressure design purposes, typically set at the maximum sustained fluid temperature under normal operating conditions.
What ASME B16 standard covers gaskets for pipe flanges, specifying dimensions and materials?
Answer: ASME B16.21
ASME B16.21 covers the dimensions and tolerances for nonmetallic flat gaskets and spiral-wound gaskets used with ASME B16.5 flanges.
In pipe stress analysis, what is the term for piping movement caused by thermal expansion that must be accommodated by the design?
Answer: Thermal displacement
Thermal displacement (or thermal expansion) refers to the dimensional changes in piping caused by temperature changes from installation to operating conditions, which must be accommodated through expansion loops, offsets, or flexible joints.
What does the 'Cr-Mo' designation in pipe material specifications such as ASTM A335 P11 indicate?
Answer: Chrome-Molybdenum alloy steel, providing elevated temperature strength and creep resistance
Cr-Mo (chromium-molybdenum) alloy steels are used in high-temperature steam service because the alloy additions provide superior creep resistance and elevated-temperature strength compared to plain carbon steel.
Which standard establishes the requirements for radiographic examination (RT) of pipe welds in power piping systems?
Answer: ASME Section V, Article 2
ASME Boiler and Pressure Vessel Code Section V, Article 2 provides the required methodology for radiographic examination of welds, and B31.1 references it for weld examination requirements.