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DEFN
NPS
Nominal Pipe Size
approximate inner diameter of Standard or Sched 40 pipe
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Pressure rating for STD threaded pipe=
150psig
sched 40
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Pressure rating for XS=
200psig, used in steam supplies
sched 80
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Pressure rating XXS=
1000psig +
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how do you figure out wall thickness of pipe?
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Defn
ASME
American Society of Mechanical Engineers
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Defn:
UNC
Unified National Course
Machine or bolt threads
UNF(ine) for unified national fine threads
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T/F
For UNC threads, the threads per inch or the pitch decreases as the bolt size increases.
True
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Pipe Abrv
CWP
Cold working (water) pressure
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Pipe Abrv
SP
Steam Pressure
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Pipe Abrv
WOG
Water, oil or gas
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Pipe Abrv
WSP
Working Steam Pressure
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Proper procedure in sizing a Tee
identify size of run from largest to smallest, then the branch.
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Forged Steal Threaded Fittings available in three pressure designations
Fitting Class. Sched# Weight
2000 80 XS
3000 160 ---
6000 -- XXS
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Socket Weld Fittings available in three pressure designations
Fitting Class. Sched# Weight
3000 80 XS
6000 160 ---
9000 -- XXS
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Ring type joint flange
RTG
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2H Nuts wrench size =
bolt diameter x 1.5 + 1/8"
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XXH nuts wrench size =
bolt diameter x 1.5 +1/4"
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formula used for centre to face measurement for 90' long radius butt weld elbow
NPS x 1.5
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formula used for centre to face measurement for 45' long radius butt weld elbow
NPS x 5/8
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formula used for centre to face measurement for 90' short radius butt weld elbow
NPS x 1
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how much carbon in good qulaity cast iron?
3-4%
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main characteristics of gray iron
(has graphite flakes in it)
- - resistence to wear/corrosion
- - low heat expansion
- - fractures easily
- - cannot bend
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Characteristics of Duriron
- - silicon is added
- - expansion three times greater than gray iron
- - very bittle
- - VERY high resistence to corrosion
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Defn: Annealing
to heat then cool, softening to make flexible
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what is the flow capacity of copper pipe?
20% greater than steel or iron, it expands much more though
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What is brass?
copper + zinc
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What is bronze
copper + tin
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Copper Colour Coding
Type K = Green (thickest walls)
Type L = Blue (medium walls)
Type M = Red (cannot bent, hard temper only)
Type H = White (thin wall, for hot water heat systems) no longer available
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what is the heat expansion of copper pipe?
1/8" for every 10ft and 100'F temp change
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List four reasons for supporting pipes:
- - to carry the weight of the pipe and contents
- - to grade the pipe system with adequate slope
- - to prevent sagging or deflection of piping
- - to allow for thermal movement of the system
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What is Thermosetting?
resins reacting in plastic pipe to hold a shape or form, cannot be reshaped. Stronger of the plastic pipes.
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Disadvantages of plastic pipe:
- - high expansion
- - low tensile strengtch
- - creeps
- - low heat resistance
- - low ductility
- - low fire resistence
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advantages of plastic pipe:
- - chemical resistance is good
- - not affected by electronic corrosion
- - smoother bore
- - absorbs shocks well
- - economical
- - easy to join
- - low absorbtion rate
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what is the greatest disadvantage to ABS piping?
supports combustion. PVC is self-extinguishing.
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which plastic pipe is used for underground gas lines?
high density polyethylene
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What is the minimum surface temp for solvent cementing plastic pipe an d fittings?
5'C or 40'F
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Nesting of pipe refers to:
the storage of pipe with smaller sizes in larger sizes.
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List three types of plastics best used for acid waste and vents:
- - polyethelene
- - polypropylene
- - proxylene
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Name three ways of joining plastic pipe
- butt fusion welding
- socket fusion welding
- hot air fillet weld
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List three type of plastic pipe that can be joined with solvent cement:
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How do you find the Fitting Allowance (F.A.) when cutting pipe?
Thread Engagement (TE) - Throw (T) of the fitting
Subtract FA from the end to centre or centre to centre measurment
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What describes cathotic protection?
introducing an outside electrical charge.
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T/F
Copper or yellow brass should be used in heating systems where the water may be highly corrosive
False
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Which of the following describes a lip union?
has a gasket between two seating faces
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Which disc globe valve is ideally suited for very minute throttling?
Plug Valve
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Which of the following terms describes the highest temperature at which a metal is completely solid?
Solidus
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Standard pressure test hoses are rated for a maximum temperature of _____ Celsius
65'C
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