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
Name the three types of pipe wrenches
Straight
Offset
End
What could happen if joints are over tightened
Could result in leak or break
Does the dirt pocket need to be accessible
Yes
Does the drip pocket need to be the same size as the drop
yes
Can you reuse piping material
yes, as long as you have thoroughly clean and inspected the pipe
What must you not use for leak detection
Open Flame
What are the main advantages of copper used for gas piping
Malleable, ductile and good resistance to corrosion
What size does copper roll come in
10,25,50,100 feet
Type K copper specs
Thickess wall, code green
Type L copper specs
Medium thick wall, blue
Type M copper specs
lighter wall, can’t be used in gas line, can’t be bent
When can aluminium tubing be used ?
typically run between gas valve and pilot
What must be done once copper tube is cut
Must be reamed
What does CSST stand for?
Corrugated Stainless Steel
Can CSST be installed in direct contact with the ground
No
What must be done before installing an appliance
Always read manufacturer instruction
Who is responsible of the safe operation of the appliance
The installer
What must be present on the appliance for it to be used
Rating Plate
Who’s responsability it is to make sure replacement part are equivalent to the original
Whoever is doing the installation of said component
Can a residential heat exchanger be repaired
Only temporarily and must be replaced
Is aluminium acceptable as gas piping material
No, it is not acceptable. But allowed to be used for pilot gas tubing and vent lines
Steel gas line installed on rooftop must be painted ?
yes 6.16
Shortest nipple used in a gas line is
Space Nipple
What do you use soapy liquid for
Checking for Gas leak
Which elbow is not allowed in gas installation
Street Elbow
