Iron Pipe and Fittings Flashcards
Test 4
What is the proper fabrication procedure for threaded pipe
- Measure the cut,
- Mark the cut,
- cut the pipe,
- Ream the pipe
What does G stand for
Gas
What are joint compounds considered to be
Lubricant
Where is Rex union commonly used
Sched 40
What material are used for fabrication of fittings in gas
- Malleable Iron
- Forged steel
- Cast Iron
- Special Alloy
Class 150 Fittings
150 fittings are used on gas line and air lines up to 2” (50mm)
STD
Standard
XS
Extra strong
XXH
Double Extra Strong
XH
Extra Heavy
XXS
Double Extra Strong
Sch
Schedule
List 3 problems of unremoved burr
-Pressure loss due to flow restriction
- Localised erosion due to turbulent flow
- pipe blockage caused by material hanging up on the burr
What is the main advantage of lubrification of the thread
Allow for better tightening
Where should Teflon be applied
Male Thread
Advantage of single wheel and disadvantage
A: Small outer burrs
D: Require a full 360 degrees turn
Advantage of multi wheel and disadvantage
A: used in tight spaces
D: larger outer burrs; may spiral on pipe
Which thread is the deepest
The first thread is the deepest as it is designed to taper
All pipe fittings have tapered thread
True
As the size increase the number of threads per inch will decrease
true
When screwing on a fitting it must be turned
Clockwise
