Blueprint Reading & Interpretation Flashcards

On a gas distribution blueprint, a dashed line typically represents which of the following?

Answer: An underground or hidden line

Dashed lines on utility blueprints indicate features that are hidden from view, such as underground pipes or conduits.

What does the abbreviation 'ROW' stand for on a BGE pipeline blueprint?

Answer: Right-of-Way

ROW stands for Right-of-Way, designating the corridor of land where BGE has legal authority to install and maintain utility infrastructure.

A blueprint shows a gas main crossing a waterway with a notation 'H.D.D.' What does this indicate?

Answer: Horizontal Directional Drill

H.D.D. stands for Horizontal Directional Drill, a trenchless installation method used to bore under obstacles like rivers or roads.

When reading an isometric drawing of a gas piping system, what does it show that a standard plan view does not?

Answer: Three-dimensional spatial relationships of pipes

Isometric drawings represent a 3D view of piping systems, showing elevation changes and directional turns that a flat plan view cannot convey.

On a BGE electrical distribution drawing, what does the symbol of a circle with an 'X' inside typically represent?

Answer: A fuse or cutout

A circle with an X inside is a common symbol for a fuse or fused cutout on electrical distribution single-line diagrams.

A drawing revision block shows 'Rev C – 03/15/2025 – Added service lateral.' What should a technician do before using this drawing in the field?

Answer: Verify they have Rev C and not an older version

Technicians must always confirm they are working from the latest revision to ensure field work reflects the most current design.

What is indicated by a 'BV' notation on a gas distribution system blueprint?

Answer: Ball Valve

BV on gas distribution blueprints stands for Ball Valve, indicating the location of an isolation valve on the pipeline.