7.9 Flashcards
1
Q
What are the 4 processes to form a pipe?
A
- cutting
- bending
- flaring
- belling
2
Q
Metal piping is sized by outside diameter measured in?
A
1/16 of an inch
3
Q
Hacksaw preferably 32 TPI should be used to cut pipes (T or F)?
A
True
4
Q
When cutting pipes, how much extra should you leave and why?
A
- 10%
- to allow for any bends etc
5
Q
What is recommended before bending pipes?
A
- lightly lubricate
6
Q
2 types of flares for piping are?
A
- single
- double
7
Q
Explain swage fitting / Harrison-type?
A
- moulds a sleeve by widening pipe
- well suited for thin walled pipes
- almost totally vibration resistant
8
Q
Explain permaswage fitting?
A
- steel sleeve squeezed onto prepared pipe end with hydraulically driven tool
- can be made quickly, light, good seal
- cannot be separated (disassembly problem)
9
Q
Explain belling pipes?
A
- allows rubber hose to slip over end and held in place by a screw-type hose clamp
10
Q
High quality materials for pipes result in thinner walls, larger inner diameters (T or F)?
A
True
11
Q
> 1500 psi
A
High pressure
12
Q
<1500 psi
A
Medium pressure lines
13
Q
Suction and return lines?
A
Low pressure lines
14
Q
Scratches or nicks not deeper than to repair
A
- not deeper than 10%
15
Q
Up to 600 psi?
A
- Low pressure