Section 4 060204a-h Flashcards
What are the two types of copper for med gas piping
Type k
Type l
What is the minimum size of copper pipe for med gas
1/2”
What must med gas pipe be free of to prevent explosion or fire
Oil and grease
What method is used to join med gas piping
Brazing
What gas must be present when brazing med gas
Nitrogen
What are the approved cleaning materials for degreasing med gas materials
Trisodium phosphate and sodium carbonate
What is the minimum test pressure for med gas systems
150 psi
1030 kpa
What is the max test pressure for med gas vacuum systems
415 kpa
60 psi
What is used to complete a cross-connection test
Oil free dry air
Oil free nitrogen
Every system must be tested at every _____________.
Terminal unit
What are the color codes for oxygen
Green with white background
What are the color codes for nitrogen
White with black background
What is the advantage of hot tapping
Permits the connection of branch piping without the disruption of system pressure
What kind of valves are used in hot tapping operations
Full port
Where is the bleed valve attached to
Valve adapter
What should you do before doing a hot tap
Make sure you have enough CO2
How far away from the repair point should freeze jacket be
400mm (16”)
Compressors that have diaphragms are _________________ and are used in ____________________ applications
Reciprocating, clean air.
What is the tank used to store air called
Receiver
Compressed air may have impurities such as
Moisture, oil, and dust
What cools the air between stages of a two-stage compressor
Intercooler
Where are air dryers installed
Downstream of receiver tank
Pressure drop in a compressed air system should not exceed
5 psi
What should receiver tanks be equipped with
Safety relief, gauge, drain and pressure switch.
What are unloaders used for
Limit the fluctuations
Most compressors are _____________________ driven.
Belt
Materials used for compressed air systems are generally
Black iron and sometimes copper
Pre-filters are installed at the
Suction inlet
What is another name for piston type compressors
Reciprocating
Where are after coolers installed
Between the compressor and the receiver
What is the primary unit in a compressed air system
The compressor
Where should the air intake be installed
Coolest location possible
What joining method Is used for piping larger than 2”
Welded
What is an FRL
Filter, regulator, and lubricator.
How often should plastic pipe be identified
Every 1.5 meters
Can you use pipe without identification
NO
SDR is a relationship between
Wall thickness and outside diameter
What is schedule number
Plastic pipe referenced to the same ID and OD as iron pipe
What type of PVC is used for DWV
Type 3
Why is steel pipe lined
To prevent corrosion and erosion
What type of plastic pipe is most commonly used in the gas industry
PE (polyethylene)
How is PE pipe joined
Fusion, compression, insert fittings with clamps
What is the purpose of catalyst
Minipulate the curing process
What is the purpose of promoters
Manipulate the curing time
What is the purpose of accelerator
Manipulate the start time of the project
What is the purpose of thickener
Fill low spots in pipe and thicken resin
What sizes are available for FRP pipe
1/2” to 144”
What are the 4 methods of FRP piping systems
O-ring bell and spigot
Threaded
Flanged
MJ’s
Why is cast iron so brittle
High carbon content
What 2 forms of carbon are added to cast iron
Graphite flakes and chemically dissolved
How is cast iron soil pipe coated to prevent corrosion
Inside and out with bitumen
What is the typical pressure rating of ductile cast iron
350 psi but can exceed 1000 psi
What is the only acid that attacks glass pipe
Hydroflauric acid
What should MJ clamps be torqued to?
55-60 inch pounds
What are the 3 types of corrosion typical in the piping industry
Chemical
Physical
Electrochemical
What are non-ferrous alloys
Metals that do not contain significant amounts of iron
What is a ferrous alloy
Has at least 50% of iron (main component)
What are common types of ferrous pipes
Carbon steel pipe
Stainless steel pipes
Alloy steel pipes
Ductile iron pipes
Cast iron pipes
Galvanized steel pipes
What are common types of non-ferrous pipes
Aluminum alloys
Copper alloys
Nickel alloys
Titanium alloys
Magnesium alloys
Zinc alloys
Lead alloys
What is the Delta P for pneumatic systems
15 psi
What is the pressure relief usually set to
10 psi above cut out
Why and where are pre-filters/air-cleaners installed
On the suction inlet to the compressor to ensure a dust free clean air supply
Where are oil separators installed
Between the compressor and the receiver
What do after coolers do
Bring the temperature of the compressed air down to ambient temperatures making the system more efficient
What is the purpose of intercoolers
Cool the compressor air by 10° f between the cylinder stages
What are unloaders for
Limit the pressures according to fluctuations in demand
What is the minimum type of copper for med gas
Type L
What should med gas be pressure tested to when using cross-connection testing
150 psi or 1.5 times operating pressure whichever Is bigger
What is the joining method for HDPE pipe
Fusion
