Iron Pipe and Fittings

Question 1

Define: Alloy

Answer 1

A Substance composed of 2 or more metals or of a metal and non metal.
The process usually involves fusing and dissolving into each other when molten

Question 2

Define: Ferrous

Answer 2

A metal that contains iron, may be magnetized or rust when exposed to moist air

Question 3

Define: Non-ferrous

Answer 3

Metals or products that contain no iron, will not rust and cant be magnetized
Iron Pipe Size

Question 4

Define: NPS

Answer 4

Nominal Pipe Size - the approximate inside diameter of standard or schedule 40 pipe

Question 5

Define: PSIG

Answer 5

Pounds Per Square Inch Gauge - includes Air pressure at sea level (14.5psi)

Question 6

Define: PSIA

Answer 6

Pounds Per Square Inch Absolute - does not include Air pressure at sea level

Question 7

Wall Thickness:
what PSIG would each of these max out at? and how would you Name then by thickness
SCH 10 
SCH 40  
SCH 80 
SCH 160

Answer 7

SCH 10 - Thinnest wall
SCH 40 - Standard wall (pressure up to 150 PSIG)
SCH 80 - Extra Heavy (pressure up to 200 PSIG)
SCH 160 - Double extra heavy (pressure up to 1000 PSIG)

Question 8

Is pipe size based of of OD or IDPipe Size

Answer 8

Pipe size is based off of inside diameter (ID) up to 12”

When pipe size is 14” and larger the pipe size is then based off of outside diameter (OD)

Question 9

Schedule:

As SCH increases what happens to the pipes ID and OD

Answer 9

As SCH increases ID is reduced and OD is not affected

Question 10

What is the standard full length of an Iron pipe?

Answer 10

The standard full length of an Iron pipe is 21’

Question 11

Name 5 different Pipe End Finishes

Answer 11

1. Plain
2. Threaded
3. Threaded with Coupling
4. Bevelled
5. Grooved

Question 12

What are parallel thread and give some examples

Answer 12

These threads don’t create a seal

some examples are hose bibbs, ready rod, bolts or Threaded with Coupling ends

Question 13

A National Pipe Thread (NPT) is?

Answer 13

stated as tapered threads that enlarge at a rate of ¾” per 1’

Question 14

The angle between the teeth of a thread is?

Answer 14

60 degrees or 30 degrees for 1 tooth

Question 15

How should you dress threads using t-tape

Answer 15

When applying tape to threads leave the first 2 threads bare, then go in a clockwise rotation around male threads

Question 16

How many threads should be showing when a fitting is tight

Answer 16

Once fitting is tight 2 to 3 threads should be showing

Question 17

What’s the difference between Pipe cutters and Tube cutters

Answer 17

Pipe cutters have T handle

Tube cutter has round handle

Question 18

Info on Pipe cutters:
Multi Wheel
Advantages:
Disadvantages:

Single Wheel
Advantages:
Disadvantages:

Answer 18

Multi Wheel
Advantages: Does Not require a 360 degree rotation to cut and is faster
Disadvantages: More likely to spiral and leave both interior and exterior bur
Single Wheel
Advantages: less likely to spiral and does not leave external bur
Disadvantages: Needs to make a 360 degree rotation to cut

Question 19

2 types of reamers are _____ fluted and ____ fluted what are the differences?

Answer 19

2 types of reamers are straight fluted(use on power vise) and spiral fluted (don’t use on power vise)

Question 20

what may happen is you don’t remove burrs when cutting a pipe

Answer 20

Failure to remove burrs may result in:
Material getting caught and build up
Pressure loss
Increased chance of water hammer
Local erosion

Question 21

what roles does Cutting Oil serve

Answer 21

Cutting Oil
Keeps threads cool
Removes swarf
Lubricates the dies

Question 22

What is a nipple and what is its maximum length

Answer 22

Nipples are short pieces of threaded pipe 12” or shorter

Question 23

What increments can Nipples be purchased in?

Answer 23

Nipples can also be purchased in increments of ½” up to 6” in length, then in increments of 1” up to 12” in length