5. and 6. Plumbing Tools and Joining, installing, supporting

Question 1

What is Capillary Attraction and how does it work in Soldering?

Answer 1

Upward movement of liquid through the fibers or cellular structure of a material. Heat pulls solder into joint, Flux allows it to spread evenly.

Question 2

What temperature does solder melt at?

Answer 2

800-900 degrees F

Question 3

What separates Brazing from Soldering?

Answer 3

Temperatures above 840 degrees F, typically 1100-1500. Uses MAPP or LP gas. Typically used in refrigeration, medical gas piping, and natural gas piping. Binds metals together better than soldering.

Question 4

What is 95/5 solder and when should it be used?

Answer 4

95 percent tin, 5 percent antimony. Can be used on potable water supply. Avoid.

Question 5

What is NPT?

Answer 5

National Pipe Thread - U.S. standard for steel tapered pipe threads at 60 degree angle used in water, gas, steam pipes. Must have 1 inch minimum of threading.

Question 6

What are the parameters for properly burying pipes?

Answer 6

Must have solid bedding material to support the pipe. Small pockets left open beneath the joints to allow for movement.

Question 7

What is an Interference Fit for PVC?

Answer 7

Pipe and fitting fit where diameter of internal member is slightly larger than smallest diameter of external member.