GPT Blueprint Reading & Interpretation 3

Question 1

On a commercial gas blueprint, what does the abbreviation 'GL' next to an elevation mark typically mean?

Accepted Answer

Ground level

Answer

'GL' in elevation references stands for Ground Level, used to establish the datum from which pipe heights are measured.

Question 2

A drawing detail specifies 'pipe sleeve through fire-rated wall, annular space sealed with approved firestopping material.' What does the annular space refer to?

Accepted Answer

The gap between the outer diameter of the pipe and the inner diameter of the sleeve

Answer

The annular space is the ring-shaped void between the pipe's outer surface and the sleeve's inner surface that must be firestopped.

Question 3

What is indicated when a gas piping blueprint shows a pipe run with a slope arrow and a ratio of '1:240'?

Accepted Answer

The pipe must drain at 1 inch of fall per 240 inches of run toward a drip leg

Answer

A slope of 1:240 means the pipe falls 1 inch for every 240 inches of horizontal run to drain condensate toward a drip leg.

Question 4

On a blueprint, a gas branch line is shown terminating with a 'capped tee.' What is the purpose of this detail?

Accepted Answer

To provide a future connection point while keeping the system operational

Answer

A capped tee allows future equipment connections without cutting and modifying existing piping, while keeping the system pressure-tight.

Question 5

A gas piping plan shows 'NG' on some lines and 'LP' on others. What do these abbreviations indicate?

Accepted Answer

Natural Gas and Liquefied Petroleum (propane) as separate fuel systems

Answer

NG designates Natural Gas piping and LP designates Liquefied Petroleum (propane) piping, which are separate systems with different pressure and material requirements.

(GPT) Gas Pipe Technician Certification Practice Test

(GPT) Gas Pipe Technician Certification Practice Test

GPT Blueprint Reading & Interpretation 3