On a plumbing plan, what does the symbol showing two parallel lines with perpendicular short lines represent?
Correct Answer
C) Gas line
The symbol with two parallel lines and perpendicular short lines represents a gas line in plumbing drawings. This distinctive symbol helps differentiate gas lines from water supply and waste lines.
Why This Is the Correct Answer
The symbol showing two parallel lines with perpendicular short lines is the standard architectural symbol for gas lines in plumbing and mechanical drawings. The perpendicular short lines (often called 'hash marks' or 'tick marks') crossing the parallel lines create a distinctive visual identifier that differentiates gas lines from other utility lines. This standardized symbol is used consistently across construction drawings to ensure clear communication between contractors, plumbers, and other trades. The symbol helps prevent dangerous mistakes during installation by making gas lines easily identifiable.
Why the Other Options Are Wrong
Option A: Hot water supply line
Hot water supply lines are typically represented by a single solid line, sometimes with an 'H' designation or shown in red on color drawings, not with parallel lines and perpendicular marks.
Option B: Cold water supply line
Cold water supply lines are usually shown as a single solid line, sometimes with a 'C' designation or shown in blue on color drawings, not with the parallel line and hash mark symbol.
Option D: Waste line
Waste lines are typically represented by a single thick line or double lines without the perpendicular hash marks, and often include arrows showing flow direction toward the main sewer line.
Memory Technique
Think 'Gas = railroad tracks with ties' - the parallel lines look like railroad tracks and the perpendicular marks look like railroad ties, helping you remember this is the gas line symbol.
Reference Hint
Florida Building Code - Fuel Gas chapter, or architectural drafting standards section covering plumbing symbols and legends
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