SPED Pipe Support Design 3

Question 1

What is a 'pipe shoe' support and why is it used on insulated piping?

Accepted Answer

A support element welded or clamped to the pipe to elevate it from structural steel, preventing insulation crushing

Answer

A protective thread cap used during shipping

Answer

A type of flexible elastomeric vibration isolator

Answer

A corrosion coupon holder attached to the pipe exterior

Question 2

Per ASME B31.3, which characteristic distinguishes a non-integral pipe support attachment from an integral one?

Accepted Answer

Non-integral attachments grip or clamp externally without altering the pipe wall; integral ones are welded to or through the pipe

Answer

Non-integral attachments are temporary; integral ones are permanent

Answer

Non-integral attachments are used only on large-bore pipe above NPS 6

Answer

Non-integral attachments require PWHT; integral ones do not

Question 3

MSS SP-69 serves what purpose in the context of pipe support engineering?

Accepted Answer

It provides selection and application guidance for choosing the correct hanger or support type for given conditions

Answer

It specifies weld procedure qualifications for pipe attachment lugs

Answer

It defines pressure ratings for threaded support rod connections

Answer

It establishes corrosion protection requirements for buried supports

Question 4

For high-temperature piping services above 750°F (399°C), which material consideration is most critical when selecting pipe support components?

Accepted Answer

Selecting Cr-Mo alloy steel with adequate creep resistance and retained high-temperature strength

Answer

Using hot-dip galvanized steel to prevent oxidation scaling

Answer

Applying elastomeric pads to isolate thermal conduction to structure

Answer

Using austenitic stainless clamps to avoid carbon steel entirely

Question 5

What is a 'trunnion support' and for what type of piping is it commonly used?

Accepted Answer

A short cylindrical pipe stub welded perpendicular to the main pipe to transfer loads to structural support, used on large or heavy piping

Answer

A threaded rod assembly used on small-bore instrument tubing

Answer

A flanged connection piece for quick-disconnect maintenance access

Answer

An electrical grounding lug welded to the pipe exterior

Question 6

Which method of support is most appropriate for buried underground piping to prevent differential settlement and point loading?

Accepted Answer

Properly compacted granular bedding providing continuous, uniform support along the pipe length

Answer

Variable spring hangers suspended from concrete ductbanks

Answer

Concrete saddles placed at 10-foot intervals along the trench bottom

Answer

Rigid rod hangers from buried anchor blocks

Question 7

When a pipe support weld attachment (such as a lug) is made directly to an alloy steel pipe, which additional fabrication requirement commonly applies per ASME B31.3?

Accepted Answer

Preheat and potentially post-weld heat treatment (PWHT) per the applicable P-number requirements

Answer

The lug must be made of copper to prevent galvanic corrosion

Answer

The weld must be performed with GMAW (MIG) process only

Answer

The attachment must be inspected by RT (radiography) only