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28 Cards in this Set
- Front
- Back
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What percentage of carbon is included in the raw material when mild steel is made into pipe? |
.1% - 2% |
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How are the physical characteristics of steel affected when the percentage of carbon is changed in the base material? |
As the carbon increases, so does the strength, as well as the brittleness |
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List four different methods that are used to manufacture steel pipe. |
1. Furnace butt weld 2. Electric resistance welded 3. Seamless pipe 4. Spiral weld 5. Hot rotary piercing |
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What is the difference between steel pipes made by the ERW method and the butt weld method? |
ERW heated after formed Butt weld heated before formed |
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What is a "billet" and how is it used to manufacture steel pipe? |
Solid stock of steel used for seamless pipe |
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What does the term "skelp" mean in relation to steel pipe and how is skelp used? |
Thin sheets of metal used to make welded pipe |
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List three well thickness designations for steel pipe. |
1. STD 2. XS/XH 3. XXS/XXH |
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Which of the previous wall thickness designations have an equivalent Schedule number and what are the Schedule numbers for these designations? |
STD (SCH 40) XS/XH (SCH 80) |
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What pressure ratings correspond to these wall thickness designations? |
SCH 40 - 150 PSI SCH 80 - 250 PSI XXS/XXH - >1000 PSI |
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How are Schedule numbers used to designate the strength of steel pipe? |
Designates wall thickness. |
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How does an increase in Schedule number affect the inside diameter of steel pipe?
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Decreases inside diameter due to wall thickness being higher |
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List four common methods for finishing the exterior walls of pipe. |
1. Black iron 2. Oiled 3. Yellow jacket 4. Painted 5. Galvanized |
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List two different alloys which are used to manufacture steel pipe. |
Chromium and nickel |
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What different finishes are available for the ends of pipe? |
Plain, threaded, beveled, grooved |
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What are the metric and imperial designations for the co-efficient of expansion of steel pipe? |
.0000067 F .0000120 C |
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Why is cutting oil used when threading steel pipe? |
Reduce friction Cools die and pipe Clear swarf Ensure good thread |
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What lubricant is used when threads are cut into brass pipe? |
Soapy water |
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Why must the internal burr that is created by a pipe cutter be removed before piping is installed? |
To decrease turbulence and chance of blockages |
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What pipe reamer is used for a manual reaming application only? |
Spiral reamer |
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List three different ways to describe the amount of taper of an American Standard Pipe Thread |
3/4" diameter per 12" 1" diameter per 16" 1" radius per 32" |
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Explain the term "throw" of a fitting. |
Distance from the face of the fitting to the center of the fitting |
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Explain the term "Thread engagement" as it applies to a properly made up threaded pipe joint |
The amount of space the pipe will thread into the fitting |
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Explain the term "fitting allowance" as it pertains to a pipe fitting |
Throw minus the thread engagement |
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What is the name for the measurement from one crown to the next crown of a pipe thread? |
Pitch |
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In regard to pipe fittings, what term applies when the thread engagement of a fitting is subtracted from the throw of the fitting? |
Fitting allowance |
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What is the thread angle of an American Standard Pipe thread? |
60 degrees |
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What advantage does a multi-wheel pipe cutter have in relation to a single wheel pipe cutter? |
The multi-wheel cutter doesn't require the full 360 degree rotation that a single wheel cutter does |
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What can be considered as disadvantages of a multi-wheel pipe cutter in relation to a single wheel pipe cutter? |
The multi-wheel cutter creates both an external and internal burr that will need to be removed. |
