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Transitional Fittings And Pipe Tees Flashcards

1
Q

How are pipe tees identified

A

By the angle and diameter of the stub and the diameter of the body

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2
Q

How is the type of seam determined

A

By the pressure class and material thickness of the ducting system

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3
Q

What is the formula to calculate the stretch out of the cylinder

A

3.14xdiameter of the cylinder

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4
Q

Why is it necessary to number the plan views and patterns properly

A

Miter line may turn out not correct

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5
Q

What methods can be used to divide the stretch out on the round stub

A

Dividers
Slope line method
Mathematically

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6
Q

Why is it important to lay out all patterns as inside patterns

A

Inside patterns will place all the scribe lines inside the fitting

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7
Q

Why is notching necessary

A

For ease of assembly and equiptment may be damaged do to layers of metal not being removed

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8
Q

Why is it a good idea to start spot welding at the center of the lap seam

A

Eliminate buldging or buckling between spot welds

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9
Q

What should you do to the metal of the body before folding the hooks for a grooved seam

A

Ends of material should be rolled slightly to reduce flat spots at the seam

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10
Q

When cutting the hole in the body you should cut directly on the line

T or F

A

False

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11
Q

Why is it useful to know the fabrication technique when measuring a fitting to be installed

A

To know if a given fitting is practical or not

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12
Q

When fabricating a transitional fitting which type of lock is commonly used

A

Pittsburg is the most common

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13
Q

What type of fitting is needed if a duct changes size in both dimensions and sometimes also changes direction

A

Transition/transitional fitting is needed

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14
Q

List three places where transitional duct fittings could be used

A

Reduced airflow
Increased airflow
Accommodate architectural requirements

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15
Q

Which rectangular duct ratio of width to depth moves air most efficiently

A

1:1

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16
Q

Which duct size ratio should be maintained to optimize airflow

A

1:1

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17
Q

What should be done to a duct that is approaching 4:1 width to depth ratio

A

Should be transitioned back to square or round ASAP

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18
Q

List two factors that may make transitional fitting fabrication impractical

A

Layout skills
Cost of fitting

19
Q

What knowledge is required when developing patterns for a transitional fitting

A

Triangulation and how to develop patterns

20
Q

What affects the overall cost of developing patterns for a transitional fitting

A

Labour and layout costs

21
Q

List two options that can be used to avoid a complex transitional fitting

A

Change duct sizes to something that does not require a transitional fitting

Transition done in two fittings

22
Q

Why is it not recommended to use multiple fittings connected together in a medium to high pressure duct system

A

Cause turbulence, noise and pressure loss in airstream

23
Q

When would we used the specialized term flat on back/ flat on top

A

A transitional fitting that shows flat on one of the cheeks

24
Q

When would we used the specialized term “on center “

A

When A transitional fitting that has equal amounts of change on both sides

25
Q

What is the allowance for a raw edge duct connection

A

No allowance is added to the completed pattern

26
Q

list two scenarios where we would use a raw edge duct connection

A

The duct or fittings are welded

When manufactured duct connectors are applied to the end of the duct or fitting

27
Q

Where would we most commonly use a slip and drive duct connection and what is the allowance added to the end of the duct

A

Square duct, 1/2” allowance

28
Q

What is the technical term used for cp connection

A

Standing drive

29
Q

Why is cp connection primarily used on a larger duct

A

Adds strength and rigidity

30
Q

Where do we primarily use a hammerlock connection

A

Joining a smaller piece of duct to a larger piece of duct

31
Q

What is the allowance added to the edge of a duct to accept a hammerlock connection

A

3X width of the seam

32
Q

List three fittings that hammerlock connections are sometimes used on

A

Duct connection collars

Plenum take off

Tee branches

33
Q

List three things that can be done to a slip joint to stiffen long/wide duct connections

A

Extra folds

Flat iron

Angle iron

34
Q

What adjustments need to be made to the end of a duct fitting that is to be fabricated with either a standing drive cp or a hammerlock seam

A

No adjustments

35
Q

Other than the slip and drive connection S plus D list one more transverse duct connection that requires an adjustment to the net pattern

A

Proprietary connection

36
Q

When fabricating a transitional duct fitting that has a proprietary duct connection what determines the amount we need to shorten the net pattern for development of the fitting

A

Size of slelected proprietary flange

37
Q

How are fittings drawn on blueprints by engineers

A

Net patterns

38
Q

What standards do most prints or job specifications state that all ductwork must be constructed meet

A

SMACNA

39
Q

When developing patterns why do we thrive to keep all of the layout lines on the inside of the fitting

A

Taking Pride in the work

40
Q

List two ways we can add the allowances used to join ducts together on our change cheek

A

Measure allowance perpendicular to the net pattern line

Use a compass to scribe arcs on either end

41
Q

Why is it recommended to calculate and pre cut the wrappers when developing the fitting

A

Saves time

42
Q

When fabricating a transitional duct fitting, why do we use an angle transfer notch on some of the angled sides

A

Removes material that will interfere with the duct connection

43
Q

What formula can be used to find the sloped side of a triangle

A

Pythagorean theorem

44
Q

What strategy can be used in a shop to eliminate much of the triangulation work associated with developing patterns for a flat sided transition

A

Cut lists, calculations done before metal is cut, to determine cut lengths

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