FPE Blueprint Reading & Specifications 3 — Questions and Answers
Question 1: On a fire protection drawing legend, a solid circle with a 'P' designation typically represents:
- A pendent sprinkler head (Correct answer)
- A pressure gauge
- A pipe support anchor
- A post indicator valve
Correct answer: A pendent sprinkler head
Most fire protection drawing legends use a filled circle with 'P' to denote pendent-type sprinkler heads, distinguishing them from upright ('U') or sidewall ('SW') types.
Question 2: Which drawing type would an engineer consult to verify the required fire-resistance rating of a wall penetration for a sprinkler pipe?
- Hydraulic calculation sheet
- Architectural fire and smoke wall legend or partition schedule (Correct answer)
- Isometric drawing
- Equipment schedule
Correct answer: Architectural fire and smoke wall legend or partition schedule
Architectural fire wall legends or partition schedules document the required fire-resistance rating (FRR) of each wall type, informing what firestop assembly is needed at pipe penetrations.
Question 3: A specification section's 'Part 1 – General' typically contains all of the following EXCEPT:
- Related sections
- Submittals requirements
- Installation methods and sequencing (Correct answer)
- Quality assurance requirements
Correct answer: Installation methods and sequencing
Installation methods are covered in 'Part 3 – Execution'; Part 1 – General addresses administrative and procedural requirements such as submittals, references, and quality assurance.
Question 4: On a fire protection drawing, an arrow pointing to a pipe with a note '2½" G.I.' indicates:
- 2.5-inch diameter galvanized iron pipe (Correct answer)
- 2.5-inch pipe with 2½-pound wall thickness
- A 2½-inch groove-joint fitting
- A 2.5-inch gate isolation valve
Correct answer: 2.5-inch diameter galvanized iron pipe
G.I. is standard shorthand for galvanized iron (steel) pipe; the leading dimension denotes nominal pipe diameter.
Question 5: What does the designation 'OS&Y' on a fire protection plan indicate?
- Outside stem and yoke gate valve (Correct answer)
- One-sided yard hydrant
- Overhead sprinkler and yard connection
- Open-set yoke bracket
Correct answer: Outside stem and yoke gate valve
OS&Y stands for Outside Screw and Yoke, a type of gate valve commonly used as a control valve for fire sprinkler systems because its open/closed position is visually obvious.
Question 6: When specifications state that materials shall conform to 'ASTM A795', this refers to:
- Standard specification for black and hot-dipped zinc-coated welded and seamless steel pipe for fire protection use (Correct answer)
- ASME boiler pressure vessel code for fire suppression
- ASTM standard for copper tube used in fire sprinkler systems
- American standard for ductile iron pipe in fire service
Correct answer: Standard specification for black and hot-dipped zinc-coated welded and seamless steel pipe for fire protection use
ASTM A795 covers black and hot-dipped zinc-coated (galvanized) welded and seamless steel pipe specifically listed for fire protection service.
Question 7: A fire protection isometric drawing differs from a plan view drawing primarily because it:
- Shows piping in three dimensions without perspective distortion, making offsets and fittings easier to visualize (Correct answer)
- Is drawn to a larger scale for detailed fabrication
- Replaces the hydraulic calculation in the submittal package
- Shows only the underground fire service main
Correct answer: Shows piping in three dimensions without perspective distortion, making offsets and fittings easier to visualize
An isometric (or 'iso') drawing uses axonometric projection to show all three pipe axes simultaneously, clearly depicting elbows, tees, offsets, and fittings that are hard to read in plan or elevation alone.
FPE Blueprint Reading & Specifications 3
On a fire protection drawing legend, a solid circle with a 'P' designation typically represents: