Gas Piping Flashcards
Schedule 40 (s-40) will sustain what pressure
150 PSI
What material can be used in gas pipe by code
Steel
Copper
Plastic
Black iron
Most common material used in gas piping ?
Black Iron Pipe
Are close nipples permitted to be used on gas piping
No, the code does specifically prohibit the use of close nipples
On a thread, what is the included angle
60 degrees
The thread cut on the outside wall of pipe is know as ?
Male or external thread
What are the two type of pipe cutter used in the ILM
Single Wheel
Multi wheel
What is the approximate for 1/2 and 3/4 inch thread
3/4 inch thread to be cut
14 thread per inch
10.5 thread
4.75 hand tight
3 wrench tight
What reamers should never be used with power drive
Spiral Reamers
Reamers are available as
straight-fluted, Spiral
What is a reamer for ?
Remove internal Bur
Why should you oil the threader and pipe during the process
A generous amount of thread-cutting oil is the best safeguard against poor threads, excessive die wear, clearing debris build up and heat.
It also makes the job easier by reducing the friction between the die and pipe
When must you stop threading.
Faces of the dies are flush with the end of the pipe or manufacturer recommendations.
What will happen if you continue to thread beyond the flush point.
You will make a straight or running thread in addition to the taper
What are black iron fittings referred as
Malleable
Are black iron fittings the same size as black iron pipe
yes
What class is used for fittings in our course
Class 150
How do you give the size of a tee
- Run
- Run
- Branche
Purpose of a union is to
Allow for easy and quick assembly and disassembly of piping system
What is the minimum lenght of a drip pocket
3”
Is the nesting of Bushings prohibited
Yes
How must Teflon tape be applied to the pipe thread
Clockwise, with a 50% overlap leaving the first two thread bare.
Is white plumbing Teflon approved for gas use
no
All tapes and joining compounds must be approved for gas use (T/F)
Yes
