Trapeze Hangers - Assessment

1.

Multiple Choice

30 sec

5 pts

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

2.

Multiple Choice

30 sec

5 pts

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.

3.

Multiple Choice

30 sec

5 pts

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.

4.

Multiple Choice

30 sec

5 pts

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

5.

Multiple Choice

30 sec

5 pts

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

6.

Multiple Choice

30 sec

5 pts

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

7.

Multiple Choice

30 sec

5 pts

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

8.

Multiple Choice

30 sec

5 pts

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

9.

Multiple Choice

30 sec

5 pts

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

10.

Multiple Choice

30 sec

5 pts

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

11.

Multiple Choice

30 sec

5 pts

Where slotted holes are used, the edge of the hole must be a minimum of ____ from the edge.

1"

2"

3"

4"

12.

Multiple Choice

30 sec

5 pts

Washers shall have a minimum thickness of ___ the thickness of the angle iron being used.

1/4

1/2

3/8

equal

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