PC Blueprint Reading & Interpretation 3 — Questions and Answers
Question 1: On plumbing blueprints, what does the symbol 'HB' typically denote?
- Hot Boiler
- Hose Bibb (Correct answer)
- Hub Bushing
- High Bypass
Correct answer: Hose Bibb
HB stands for Hose Bibb, which is an outdoor faucet with a threaded end for attaching a garden hose.
Question 2: A plumbing plan shows pipe with the notation '2" PVC DWV.' What does DWV stand for?
- Dual Water Valve
- Drain Waste Vent (Correct answer)
- Deep Water Volume
- Direct Wall Vent
Correct answer: Drain Waste Vent
DWV stands for Drain Waste Vent, describing PVC pipe designed for drainage, waste, and vent applications.
Question 3: What does a 'section view' on a plumbing blueprint show that a floor plan cannot?
- Fixture locations
- Interior details of walls, floors, and vertical pipe routing (Correct answer)
- Roof penetrations only
- Equipment schedules
Correct answer: Interior details of walls, floors, and vertical pipe routing
A section view cuts through the building to reveal interior vertical details, showing how pipes route through walls, floors, and structural elements.
Question 4: On a blueprint, a pipe labeled '4" CI' refers to what material?
- Copper Irrigation pipe
- Cast Iron pipe (Correct answer)
- Corrugated Insulated pipe
- Coated Iron pipe
Correct answer: Cast Iron pipe
CI is the standard abbreviation for Cast Iron pipe, commonly used for soil and drain lines.
Question 5: When a plumbing drawing shows 'INV EL 98.50,' what does this notation indicate?
- The pipe is 98.50 feet long
- The invert elevation is 98.50 feet above datum (Correct answer)
- The pipe has a 98.50% slope
- There are 98.50 inches of cover
Correct answer: The invert elevation is 98.50 feet above datum
INV EL refers to Invert Elevation, the elevation of the inside bottom of the pipe measured from a reference datum.
Question 6: What does a double line on a plumbing floor plan typically indicate compared to a single line?
- A larger diameter pipe (Correct answer)
- A pipe with insulation
- A pressurized line
- A gas line
Correct answer: A larger diameter pipe
Double lines on a plumbing plan typically represent larger-diameter pipes, while single lines represent smaller pipes.
Question 7: A plumbing blueprint references 'detail 3/P-5.' How should a plumber interpret this notation?
- 3rd pipe on page 5
- Detail number 3 found on plumbing sheet P-5 (Correct answer)
- 3-inch pipe, 5 feet long
- Third revision of pipe schedule 5
Correct answer: Detail number 3 found on plumbing sheet P-5
The notation means Detail 3 as shown on plumbing drawing sheet P-5, directing the reader to a specific enlarged detail on another sheet.
PC Blueprint Reading & Interpretation 3
On plumbing blueprints, what does the symbol 'HB' typically denote?