PD TQ Prep Flashcards
What step differentiates conical layout from radial line development?
Both use a vertical apex and elevation view but radial adds the use of a plan view
When is a branch mitre developed?
Two or more oblique cones intersect, creating one primary opening and multiple secondary openings
Is a full pattern necessary when developing a pattern for an oblique three-way?
False
Is it necessary to create a plan view when developing an oblique three-way Y Branch?
True
What is an apex in plan view B used to accomplish?
Swing true length lines
Which pipe tee on cone fitting is most preferred on a dust collection system?
30 degree
What other application is the preferred pipe tee on cone fitting used?
Commercial air handling
Where is a conical tee on round pipe typically found?
Commercial HVAC
Is a side elevation view necessary when developing a 90° conical tee fitting?
No
Is a side elevation view necessary when developing a 30° conical tee fitting?
Yes
What size of pattern is necessary to develop a 90° conical tee fitting?
¼ view
Where are boot tees commonly found?
Dust collection systems
What application is a tee on taper commonly used in?
Blow pipe system
What other fitting usually accompanies a commercial conical tee?
Reducer
Where can sectional curves be found?
45° fitting
What is the minimum number of points needed to develop sectional curves?
3
What view is developed from the sectional curves?
Hole miter plan view
What must be developed on the elevation view prior to creating the hole pattern stretchout?
The developed miter
What method is used to develop the hole pattern for a 45° pipe tee on cone?
Radial line development
What is a residential conical tee fitting commonly called?
Saddle takeoff
What type of fitting do boot tees commonly replace?
45° Tee
What is the shape of the mitred end of a right cylinder?
Elliptical
What method is used to develop an oblique cylinder pattern?
Line to line
The oblique cylinder ½ pattern curved stretch out equals ½ the cylinder’s mitred _____?
Circumference
What method is used to develop the pipe tee stretch out?
Parallel line development
What does the plan view in radial line help to develop?
Frustums of cones, cone intersections and point locations
What is used to measure the stretch out when developing the full pattern stretch out for a cone?
Pee wee tape
If the plan view is above the elevation view, what view are you looking at?
TOP VIEW
If the plan view is below the elevation view, what view are you looking at?
BOTTOM VIEW
What application uses pipe tees on cones?
Blow pipe/dust collection systems
When laying out a pattern for a truncated cone, what should you do first?
Always draw the entire cone first and cut it off later.
What is the remaining portion called when a cone is laid out and then truncated?
Frustum
Which way do element lines always run?
Apex to base or base to apex ABBA
Are element lines that fall on the outside sloped sides of a cone true length or foreshortened?
True length
What are pipe tee on cone fittings sometimes referred to as?
Stub Ys
What is the preferred pipe angle on a pipe tee fitting?
30 degrees
Besides dust collection systems, where else are pipe tee on cone fittings found?
Commercial air handling units
How many plan views are needed to develop all patterns for a pipe tee on cone fitting?
2 - The pipe tee plan view and the conical fittings plan view
What shape will the hole pattern be for a horizontal pipe tee on cone?
Like a shield
What shape will the hole pattern be for a vertical pipe tee on cone?
Teardrop shaped
What shape will the hole pattern be for a 45 degree pipe tee on cone?
A circle
What can be developed on a cone fitting once you have the mitre line?
Hole and stub pattern
Where is a cone on pitch usually found?
Residential sloped roofs
What other fitting usually accompanies conical tees used in commercial applications?
Reducer
What is another name for a pipe tee on cone?
Tee on taper
What is a conical tee fitting used in residential commonly called?
Saddle take off
How many views are required for developing a pattern for a 90 degree conical tee?
One
How many views are required when developing a pattern for a conical tee that is not 90 degrees?
Two
What is the formula for Vertical Apex?
Vertical apex = vertical height x large diameter divided by large diameter - small diameter
What view is developed from the sectional curves?
The hole, mitre plan view
What must be developed on the elevation view prior to creating a whole pattern stretch out?
The developed mitre
When constructing an oblique three-way Y branch, are both plan and elevation views necessary?
True
What two fittings is slipping a pattern commonly used for?
Transitional elbows and offsets
What is the formula for calculating a mitre in the field?
M = Offset x Width / Length
What type of layout is used for a cylinder intersecting a cone?
Radial Line & Parallel Line
What method of pattern development may be applied to a project using the gore method?
Parallel Line development
When laying out the pattern for a tee stub at 45 degrees, where are the true lengths for the stub taken from?
Side Elevation view
How could you layout a taper if the apex is off the work surface?
Triangulation
To develop a pattern by means of parallel lines, what must you first draw?
Plan and elevation views
What is a Right cone?
Has tapering sides and a cutting plane at 90 degrees to the axis would be a circle
What is an oblique cone?
Has tapering sides and a cutting plane at 90 degrees to the axis would not be a circle
What views are needed to make an off center right angle boot?
Side and end view
Is an oblique cylinder laid out by parallel line development?
True
When developing a pattern for a 6pc. 90 degree round elbow, how many parts would the elbow be divided into?
12 parts
When using parallel line development of right cylinders, will the stretch-out line always be at right angles to the element lines?
True
What is the centerline radius equal to?
2½ times the diameter of the elbow
Can a round funnel be laid out with parallel line development?
No
When developing a pattern for a right angle boot, where are the 1/12 spacings taken from?
The collar
