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 A193 B7 (chromium-molybdenum alloy steel) studs and rods are specified for elevated temperature service where carbon steel loses strength.

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

A pipe shoe elevates the pipe to allow insulation to be wrapped completely around it without being compressed or damaged at the support location.

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

Lateral braces (sway braces) resist the horizontal seismic forces that would otherwise push the pipe off its intended path during an earthquake.

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

Standard span tables (e.g., ASME B31.1 Appendix A) indicate approximately 17 feet for 6-inch water-filled carbon steel pipe based on allowable sag and stress.

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

A clevis hanger uses a U-shaped clevis and hanger rod to suspend a pipe from overhead structural members and is one of the most common rigid hanger types.

Piping Practice Test

Piping Practice Test

Piping Piping Supports and Hangers 3