Seams, Fasteners, Sealants And Insulation (110101k) Flashcards
What are sheet metal seams?
Sheet metal seams are how two or more pieces, parts or sections of sheet metal are fastened together
What are standing seams used on?
Items such as metal roof panels, large air ducts, fittings and plenums
What is another name for single seam?
Peened seam
What is a double seam?
A single seam that is hammered over to form the double seam
What is an elbow seam used for?
Joining individual sections of round elbows to the bodies of fittings such as square to round
What is a dovetail seam?
A field fabricated seam used in place of a hammer lock seam
Why is a drip edge used?
To divert the flow of water away from the structure it is attached to
What is a flanged edge used for?
It gives a means to attach it to something else as well as strengthing the edge
What lock is used on round and oval pipe?
Snap lock
What lock is used on lighter gauge residential installations?
Button lock
What is most used lock in sheet metal?
Pittsburgh lock
Where is a hammerlock used?
On the ends of rectangular and round take offs used for branch lines of main ducts.
Pto, top takeoffs, side takeoffs etc
What is a joint?
Joints can be defined as the means to connect ductwork and fittings together
What are slip and drives for?
These are used to attach ductwork and fittings together
What does TDC mean?
Transverse Duct Connector which is a patented duct connection system that you will never see in real life
What is notching for?
To remove areas of metal that interfere with bending and forming
What are some different types of notches?
Straight notch
Square notch
Slant notch
Full v notch
V notch
What is a fastener?
A mechanical device designed to hold, join, assemble or secure various components of an object or structure
Why are they called blind rivets?
Because they can be set from one side of the work they don’t need access to both sides
Is a weather tight seal waterproof?
No
What are three types of blind rivet heads?
Dome head
Countersunk
Large flanged
What are the two basic types blind rivets come in?
Open end
Closed end
Why should acrylic caulking not be used indoors?
These have a strong odour
What is thermal insulation used for?
To slow down the rate of heat transfer from inside the duct to surrounding atmosphere.
Prevent heat loss
What is the difference between self tapping and self piercing?
Self tapping has a drill bit in the end
Self piercing makes a smaller hole and can be reused in same hole
