Rigging, Hangers, and Supports Flashcards

Which type of pipe support is specifically designed to allow pipe movement in one direction while restricting movement perpendicular to that direction?

Answer: Guide

A pipe guide permits axial movement along the pipe run while restraining lateral (transverse) movement.

What is the minimum safe working load (SWL) rating a shackle must have when used to lift a 4,000 lb pipe spool?

Answer: 4,000 lb

The SWL of any rigging component must be equal to or greater than the total load being lifted; 4,000 lb is the minimum acceptable rating here.

A three-point hanger rod assembly uses a turnbuckle primarily to:

Answer: Allow fine adjustment of rod length and pipe elevation

Turnbuckles allow field adjustment of the hanger rod length to set the pipe at the correct elevation.

When rigging a long horizontal pipe spool for lifting, spreader bars are used to:

Answer: Keep the sling legs vertical and prevent crushing the pipe

Spreader bars maintain vertical sling legs, eliminating inward compressive forces on the pipe that could cause deformation.

Which ASME standard governs the design and selection of pipe hangers and supports in power piping systems?

Answer: ASME B31.1

ASME B31.1 (Power Piping) includes requirements for pipe support design, spacing, and installation.

A snubber (shock absorber) support is installed on piping to:

Answer: Allow slow thermal movement but resist sudden dynamic loads

Snubbers lock up under rapid dynamic loading (earthquake, water hammer) while remaining free to move under slow thermal expansion.

When using a chain hoist (chain fall) to position heavy pipe, the rigger must verify that the:

Answer: Overhead attachment point is rated for the load

The overhead structural attachment point must be rated to support both the load and the weight of the hoist itself.