Piping Piping Supports and Hangers 3

Question 1

Which of the following materials is commonly specified for pipe support components (rods, bolts) in high-temperature steam piping above 750°F (400°C)?

Accepted Answer

ASTM A193 B7 alloy steel

Answer

ASTM A36 carbon steel

Answer

304 stainless steel clamps only

Answer

PVC composite brackets

Question 2

What is the primary reason for using a pipe shoe (saddle) on insulated piping?

Accepted Answer

To lift the pipe off the support so insulation can pass underneath without being crushed

Answer

To increase pipe wall thickness at the support point

Answer

To reduce the pipe's operating pressure

Answer

To act as a fixed anchor point

Question 3

In seismic design of piping systems, lateral bracing supports are added primarily to:

Accepted Answer

Resist horizontal inertial forces generated by an earthquake

Answer

Support the pipe weight during installation

Answer

Permit free thermal expansion in all directions

Answer

Reduce the number of vertical hangers required

Question 4

The maximum support spacing for 6-inch Schedule 40 carbon steel pipe carrying water, as typically provided in support span tables, is approximately:

Accepted Answer

17 feet

Answer

4 feet

Answer

8 feet

Answer

30 feet

Question 5

What is the function of a 'travelling hanger' (also called a clevis hanger)?

Accepted Answer

It provides a simple rod-and-clevis connection for hanging pipes from overhead structure

Answer

It moves automatically to follow pipe growth

Answer

It is used exclusively for underground pipe

Answer

It replaces spring hangers in all applications

Question 6

When designing pipe supports to avoid resonance with mechanical vibration sources (pumps, compressors), the natural frequency of the supported pipe span should be:

Accepted Answer

At least twice the excitation frequency (well above operating speed)

Answer

Equal to the excitation frequency of the machinery

Answer

As low as possible to absorb energy

Answer

Ignored because supports do not affect natural frequency

Question 7

A 'trapeze hanger' is typically used when:

Accepted Answer

Multiple parallel pipes are grouped and hung from a common horizontal beam

Answer

A single pipe must be hung from a flexible rope

Answer

Pipes are buried underground and need extra drainage

Answer

Steam traps require overhead support