IP example test questions Flashcards
(48 cards)
Portion of a refractory that is toxic
Silica
-How to bend 7/8 copper tubing
With a ratchet bender
Type of uncoated copper that can be direct buried
K
Back filling under (commercial depth) parking lot, calculate volume
65ft length x
12” wide x 2’ 130cu ft . plus add 100% for compaction
260
Proper way to make up a compression fitting
Nut, ferrel, push pipe to end of
fitting, plus 1-1/2 turns.
-Joining fused pipe what do you do
Cut ream bevel.
A method Joining plastic pipe
, by electro fusion
3/4 inch to 1/2 inch reducing coupling
concentric
Min and max size allowed for a field take off from 8 inch branch
No larger than 50% of the supply piping, no
less then 3/4” min
4”
-Bolt pattern for tightening a 4-bolt flange
Cross
What pipe joints can be concealed?
Welded threaded and brazed, or flange, flarred
-2” steel pipe 115 ft how many hangers?
115 ÷ 10 = 11.5 round up and add 1 = 13
-Max pressure Drop of a 20 psi system,
10 psi
-How large must a gas line be before it requires purging (old code)
4” or larger.
-Minimum pressure on a gauge for a 50 lb test
15% in excess of test pressure = 57.5 psig
Test dial face size
3” diameter
After testing with air 6” pipe, you need to do what
purge with nitrogen
-Gas piping identification in a commercial building needs to be how often?
Every 20’ for steel.
-3/4 inch to 1/2 inch reducing coupling
concentric
GVR for a corrugated chimney liner
20 percent
CAT IV, how to vent
Determine exit, measure and assemble
-How to attach joints of commercial drier duct
foil tape
S cleat and drive cleat required for duct assembly. 12’ length in four 3’ sections,
how many drive and “S” cleats and what length? 12 x 18 transition to 18 x 24 on
one end,
8 of s cleats at 18”, 8 of drive cleats at 14”.
-Combustion damper has what safety
, End switch interlocked with gas valve
