NEW
Font size
WorksheetsTrapeze Hangers
Total questions: 12
Worksheet time: 6mins
There are two reasons to install trapeze hangers. One is to install piping where there are no structural members. What is the other reason?
To transfer loads to the building structure
When ESFR sprinklers are used
To transfer loads to the ceiling grid
To keep hanger spacing consistent
Sprinkler Piping must be substantially supported from the building structure. What are the weight requirements applied at the point of hanging?
Weight of the water-filled pipe
Weight of the water-filled pipe + 250lbs.
Weight of the water-filled pipe + 500lbs.
Weight of the water-filled pipe + 750lbs.
The hanger rods used to suspend the trapeze and suspended pipe must be sized properly. How are the hanger rod sizes selected?
By the size of hanger rings used for trapeze and pipe
section modulus formula
both hanger and suspended rods by size of pipe suspended
by size of pipe used for trapeze, and size of pipe suspended.
Slippage of the trapeze hanger is a concern. What must be done to avoid slippage?
following manufacturer's installation instructions
adding seismic bracing
using listed hanger components
securing the trapeze member to the building structure
Pipe and Angle iron are two common trapeze hanger bar materials. Can strut and other metal sizes and shapes be used?
Only strut can be used
No other materials besides pipe and angle iron can be used
Strut can be used, and other sizes and shapes, as long as sized properly using section modulus
Other shapes and sizes may be used, but not strut
Bolts used for trapeze hangers must be provided with a flat washer and nut. What are the size requirements for holes for bolts through steel?
Holes for bolts must not exceed 1/16" the diameter of the bolt
Holes for bolts must not exceed 1/8" the diameter of the bolt
Any hole is acceptable, as long as a flat washer is provided
Holes for bolts must not exceed 1/4" the diameter of the bolt
An angle iron trapeze must be sized properly and secured to the building structure. What is another requirement for angle iron trapeze members?
Must be painted with corrosion resistant paint
Must be galvanized
Installed with longer leg vertical
Installed with shorter leg vertical
The section modulus value is used to size the trapeze member. This value can be reduced using a formula, and a smaller trapeze member can be used when:
The structural members are bar joists
The structural members are concrete
Angle iron is used for a trapeze member
The piping load is not centered between the structural members
Which of the following components is allowed to be supported from sprinkler piping?
data cables
electrical whips
detection wiring for sprinkler system components
ceiling grid wire
When are threaded sections of rod allowed to be bent?
Never
As long as it is bent using a pipe vise
When bent after installation to no more than 2 degrees from square
To match the pitch of the roof
Where slotted holes are used, the edge of the hole must be a minimum of ____ from the edge.
1"
2"
3"
4"
Washers shall have a minimum thickness of ___ the thickness of the angle iron being used.
1/4
1/2
3/8
equal
