Blueprint Reading and Symbols Flashcards
7 cards from real PIPEFITTER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Blueprint Reading and Symbols flashcards as text
What is the primary purpose of a 'north arrow' symbol found on a piping plan drawing?
Answer: To orient the drawing relative to true or plant north for field layout
The north arrow orients the piping plan to plant north (or true north), allowing field crews to align the drawing with the actual site.
On a piping drawing, what does the symbol 'FW' or a small flag on a weld symbol indicate?
Answer: A field weld to be made during construction rather than in the shop
A field weld flag (small flag on the weld symbol tail) indicates the weld is to be made at the job site, not prefabricated in the shop.
A piping drawing shows a reducer symbol labeled '8" x 6" ECC RED'. What does 'ECC' tell a pipefitter?
Answer: The reducer is eccentric, meaning the centerlines of the two ends are offset
ECC (eccentric) means the reducer has offset centerlines, used to maintain a flat bottom-of-pipe for drainage or flat top-of-pipe to avoid air pockets.
Which symbol on a P&ID represents a pneumatically actuated control valve?
Answer: A bow-tie (two triangles point-to-point) with a diaphragm actuator symbol above
A pneumatically actuated control valve is shown as a bow-tie valve body symbol with a diaphragm (dome) actuator symbol on top per ISA 5.1 standards.
On an orthographic piping drawing, what does a circle with a horizontal line through the center, drawn on a pipe, typically indicate?
Answer: A union fitting
A circle bisected by the pipe centerline is the standard symbol for a union, indicating a mechanical joint that allows the pipe to be disconnected without cutting.
What does the callout 'CONT. SUPP. @ 10'-0" O.C.' on a piping drawing mean for a pipefitter?
Answer: Install a continuous support every 10 feet on center along the pipe run
'CONT. SUPP. @ 10'-0" O.C.' means continuous supports spaced at 10-foot intervals on center along the entire pipe run.
On a piping isometric, a small square drawn perpendicular to the pipe with 'PG' labeled indicates:
Answer: A pressure gauge connection or tapping point
A square tapping symbol labeled 'PG' on an isometric denotes a pressure gauge connection or instrument tap location on the pipe.