Planning & EstimatingQuestion 306 of 360
On a gas piping plan, a note reads "2 PSI system." For planning, what does this primarily affect?
a.The paint on the pipe
b.The fixture color
c.The pipe sizing and the need for a line regulator, since higher delivery pressure changes the sizing method
d.The roof slope
Explanation
A 2 psi gas delivery pressure lets smaller pipe carry the same load but requires a line pressure regulator downstream to drop to appliance pressure, and the sizing tables differ from a standard low-pressure system. Recognizing the system pressure on the plan drives correct pipe sizing and regulator placement. Using the wrong sizing basis under-sizes or over-sizes the gas main.
Practice all 360 questions free — no signup required.
Related questions on this topic
- You take off 220 linear feet of pipe from the plans and add a 10% waste allowance. Pipe is stocked in 20-foot lengths. How many 20-foot lengths should you order?
- During planning, what is the purpose of a plumbing "plot" or "site" plan as opposed to the floor plan?
- When exactly is the final plumbing inspection normally performed?
- A two-story building has identical bathroom stacks on floors 1 and 2. The floor-to-floor height is 10 feet. Estimating vertical pipe for one stack from the first-floor drain to the second-floor branch, roughly how much vertical footage should you count?
- A plan symbol shows a circle with the letters "CO" next to a drain line at grade. What does this indicate?
- Why do estimators apply a difficulty or productivity factor to base labor units on some jobs?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review