B5 Flashcards
What is the primary objective in selecting piping supports?
a) Reducing the weight of the piping system
b) Ensuring economical and correct design and construction
c) Minimizing the use of materials
d) Avoiding the use of commercial components
Ensuring economical and correct design and construction
What is a critical factor in minimizing or avoiding pipe support problems?
a) Increasing the number of pipe supports
b) Use of advanced software tools only
c) Proper attention during the piping layout design phase
d) Ignoring accepted practices
Proper attention during the piping layout design phase
What is emphasized for pipe system supports in general design considerations?
a) Minimizing the use of dynamic supports
b) Meeting static and dynamic operational conditions
c) Avoiding international standards
d) Ensuring only static operational conditions are considered
Meeting static and dynamic operational conditions
What is a key requirement for the piping support system?
a) Ignoring thermal expansion and contraction
b) Controlling the movement due to thermal expansion and contraction
c) Minimizing the number of supporting structures
d) Reducing the weight of piping systems
Controlling the movement due to thermal expansion and contraction
Why is it advisable to superimpose piping systems on structural drawings?
a) To simplify the installation process
b) To determine the best location for pipe joints
c) To account for piping system interactions in a given area
d) To eliminate the need for preliminary studies
To account for piping system interactions in a given area
What is a primary consideration for determining the location of supports?
a) The type of piping material
b) Proximity to other systems
c) Meeting the requirements of the piping configuration
d) Minimizing the number of bends
Meeting the requirements of the piping configuration
What is a potential benefit of staggering pipe supports?
a) Ensuring uniform spacing of supports
b) Simplifying construction phases
c) Distributing loads on the supporting structures
d) Reducing the number of supports needed
Distributing loads on the supporting structures
What should be done before starting detailed support design for a piping system?
a) Finalize all piping components
b) Ensure superimposed piping is recorded on structural drawings
c) Eliminate all terminal connections
d) Ignore straight runs and bends
Ensure superimposed piping is recorded on structural drawings
What must be considered for pipe supports under seismic and dynamic loadings?
a) Using lightweight materials only
b) Increasing pipe diameter
c) Evaluating spring supports for tolerable movement
d) Eliminating all dynamic loading conditions
Evaluating spring supports for tolerable movement
What is an important factor in determining support locations in piping systems?
a) Fixed rules for all configurations
b) Engineer’s judgment based on various considerations
c) Eliminating heavy valves and fittings
d) Using only predetermined support points
Engineer’s judgment based on various considerations
What is the next step after establishing a satisfactory pattern of support locations?
a) Ignore further design considerations
b) Determine the loading and movement conditions at each support point
c) Add additional supports randomly
d) Finalize the structural drawings
Determine the loading and movement conditions at each support point
What is the suggested maximum span for a 1-inch (25 mm) nominal pipe size (NPS) in water service?
a) 7 feet (2.13 m)
b) 9 feet (2.74 m)
c) 10 feet (3.05 m)
d) 12 feet (3.66 m)
7 feet (2.13 m)
For a 6-inch (150 mm) nominal pipe size (NPS), what is the suggested maximum span for steam, gas, or air service?
a) 14 feet (4.27 m)
b) 17 feet (5.18 m)
c) 21 feet (6.40 m)
d) 24 feet (7.32 m)
21 feet (6.40 m)
What should be done to minimize piping stresses near concentrated loads?
a) Increase the spacing between supports
b) Place supports as far as possible from the loads
c) Place supports as close as possible to the loads
d) Avoid using supports near concentrated loads
Place supports as close as possible to the loads
What can cause deflection in steam lines with long spans during plant start-up?
a) Over-insulation
b) Accumulation of condensate
c) Increased support spacing
d) Reduced pipe diameter
Accumulation of condensate
What determines the basic type of support required at each support point?
a) The pipe diameter
b) The anticipated movement at each support point
c) The material of the pipe
d) The temperature of the fluid
The anticipated movement at each support point
What is the acceptable angular swing limit for a simple rod hanger?
a) 2° from the vertical
b) 4° from the vertical
c) 6° from the vertical
d) 8° from the vertical
4° from the vertical
When are variable spring supports typically used?
a) For piping with significant horizontal movement
b) For piping with significant vertical movement
c) For small vertical and horizontal displacements
d) For high-pressure systems only
For piping with significant vertical movement
What determines the type of pipe support required for a system?
a) Proximity to pumps
b) Anticipated load and movement at the support point
c) Type of fluid being transported
d) Length of the pipe
Anticipated load and movement at the support point
What is one economic advantage of using commercial catalog items for pipe supports?
a) They are made of lightweight materials
b) They eliminate the need for detailed design of components
c) They are customizable for all pipe configurations
d) They reduce the number of supports needed
They eliminate the need for detailed design of components
Which type provides flexibility at the pipe connection and allows vertical adjustment?
A) Steel clevis
B) Swivel turnbuckle
C) Malleable iron socket
D) Steel weldless eye nut
Swivel turnbuckle
Which device is used to attach a vertical rod to the top flange of a structural shape without welding?
A) Side beam or channel clamp
B) Top beam C-clamp
C) Center beam
D) C-clamp
Top beam C-clamp
What type of device is described as a U-shaped rod with threaded ends used as a support or guide?
A) Pipe clip
B) Welded beam attachment
C) U-bolt
D) Steel turnbuckle
U-bolt
What is the main feature of a Type 27 (Side beam clamp)?
A) Attaches to the top flange of a structural shape.
B) Requires no welding and attaches to the bottom flange, offset from the center.
C) Provides a curved base for cradling horizontal pipes.
D) Supports maximum gravity loads up to 1500 lb.
Requires no welding and attaches to the bottom flange, offset from the center.
What is the function of a Type 33 (Heavy welded steel bracket)?
A) Provides vertical adjustment for a structural shape.
B) Supports gravity and horizontal loads up to 3000 lb.
C) A device for cradling horizontal pipes.
D) Attaches to the sides of wooden members.
Supports gravity and horizontal loads up to 3000 lb.
Which type of support is used for pipes with horizontal movement and requires low friction?
A) Side beam bracket
B) Pipe slide and slide plate
C) Medium welded steel bracket
D) Malleable beam clamp
Pipe slide and slide plate
What does a Type 36 (Pipe saddle support) provide?
A) Vertical adjustment for structural beams.
B) A curved base for cradling horizontal pipes.
C) A device for attaching a threaded rod to a structure.
D) Horizontal support for loads up to 1500 lb.
A curved base for cradling horizontal pipes.
What distinguishes a Type 28 (Steel beam clamp with eye nut) from other clamps?
A) It attaches to the top flange of a structural shape.
B) It provides support for a gravity load from rod-type hangers.
C) It centers the vertical rod on the bottom flange of a structural shape.
D) It supports horizontal and vertical loads up to 3000 lb.
It centers the vertical rod on the bottom flange of a structural shape.
What is the purpose of a Type 13 (Steel turnbuckle)?
A) To attach threaded rods to building attachments.
B) To provide vertical adjustment using one left-hand and one right-hand threaded end.
C) To suspend horizontal pipes.
D) To cradle pipes with curved bases
To provide vertical adjustment using one left-hand and one right-hand threaded end.
Which device attaches threaded rods to bolts or pin connections?
A) Type 14 (Steel clevis)
B) Type 16 (Malleable iron socket)
C) Type 18 (Steel or malleable concrete insert)
D) Type 24 (U-bolt)
Type 14 (Steel clevis)
What does a Type 19 (Top beam C-clamp) do?
A) Attaches to the bottom flange of a structural shape.
B) Cradles horizontal pipes.
C) Attaches to the top flange without welding.
D) Supports pipes during axial movement.
Attaches to the top flange without welding.
What is the function of a Type 26 (Pipe clip)?
A) To suspend horizontal stationary lines.
B) To allow for vertical adjustment.
C) To protect pipes from insulation damage.
D) To cradle pipes horizontally.
To suspend horizontal stationary lines.
Which type is suitable for supporting gravity loads up to 1500 lb?
A) Type 31 (Light welded steel bracket)
B) Type 32 (Medium welded steel bracket)
C) Type 33 (Heavy welded steel bracket)
D) Type 34 (Side beam bracket)
Type 32 (Medium welded steel bracket)
What is the function of a Type 35 (Pipe slide and slide plate)?
A) Provides vertical adjustment for rods.
B) Cradles pipes with minimal friction.
C) Supports horizontal pipe movement with low friction.
D) Attaches to the sides of steel or wooden members.
Supports horizontal pipe movement with low friction.
What does a Type 36 (Pipe saddle support) provide?
A) Vertical adjustment for threaded rods.
B) A curved base for cradling horizontal pipes.
C) A rigid device for shock absorption.
D) Horizontal adjustment for structural beams.
A curved base for cradling horizontal pipes.
What is the primary purpose of a Type 52 (Variable spring base support)?
A) Supports gravity loads with a single spring from above.
B) Produces a constant load for vertical thermal movement.
C) Supports gravity loads with a single spring from below.
D) Supports horizontal movement with low friction.
Supports gravity loads with a single spring from below.
What does a Type 57 (Plate lug) provide?
A) Support for horizontal movement.
B) A means to connect rod-type hangers to structural steel members.
C) Support for gravity loads with thermal adjustments.
D) Shock absorption in piping systems.
A means to connect rod-type hangers to structural steel members.
What is the purpose of a Type 58 (Horizontal traveler)?
A) To accommodate vertical adjustments in pipe supports.
B) To permit horizontal piping movements under limited space conditions.
C) To prevent crushing of insulation in piping systems.
D) To attach threaded rods to building supports.
To permit horizontal piping movements under limited space conditions.
What material is used for protecting pipes in cold systems?
A) A steel saddle.
B) A vapor barrier.
C) A spring hanger.
D) A rod-type clamp.
A vapor barrier.
For Type 3 systems in cold lines, which support materials are used?
A) Steel or concrete inserts.
B) Insulated supports with vapor barriers.
C) Welded steel brackets.
D) Horizontal travelers.
Insulated supports with vapor barriers.
What type of system does not require heating or cooling?
A) Cold systems
B) Hot systems
C) Ambient systems
D) Vapor-barrier systems
Ambient systems
What is the primary function of a Type 8 (Extension pipe or riser clamp)?
A) To cradle horizontal pipes.
B) To suspend vertical stationary lines without hanger rods.
C) To provide horizontal pipe movement with minimal friction.
D) To attach to structural steel members using bolts.
To suspend vertical stationary lines without hanger rods.
What is the role of a Type 24 (U-bolt)?
A) To suspend horizontal stationary lines.
B) To guide pipes with threaded ends.
C) To attach a roller hanger to a pipe.
D) To connect rods to a structural shape.
To guide pipes with threaded ends.
Which type is used for absorbing shock loading and sway in piping systems?
A) Type 47 (Restraint control device)
B) Type 48 (Spring cushion)
C) Type 50 (Spring sway brace)
D) All of these
All of these
What does a Type 58 (Horizontal traveler) accommodate?
A) Horizontal piping movements under limited space.
B) Vertical adjustment for suspended pipes.
C) Shock absorption in piping systems.
D) Temperature control for cold lines.
Horizontal piping movements under limited space.
What type of hangers are used in multiple-pipe runs?
A. Helical-coil springs
B. Trapeze hangers
C. Variable spring hangers
D. Constant load supports
Trapeze hangers
What are the two general types of coiled-spring vibration dampeners mentioned?
A. Opposed-spring type and double-acting spring type
B. Single-spring type and hydraulic vibration type
C. Horizontal-spring type and vertical-spring type
D. Helical-spring type and flat-spring type
Opposed-spring type and double-acting spring type
What is the main advantage of hydraulic vibration control devices?
A. Resistance to movement independent of fluid velocity
B. High-temperature resistance
C. Simple mechanical design
D. Elimination of vertical movements
Resistance to movement independent of fluid velocity
What material is typically used for rods in pipe support systems?
A. Stainless steel
B. Hot-rolled steel with standard 60° threads
C. Cast iron with reinforced threads
D. Cold-rolled steel with fine threads
Hot-rolled steel with standard 60° threads
What must be considered when designing hanger rods to avoid failure?
A. The diameter of the rods must always exceed 2 inches.
B. The threaded portion of the rod should not be less than the thread root diameter.
C. The rod material should be temperature-resistant up to 1000°F.
D. The rod length must always be equal to the pipe diameter.
The threaded portion of the rod should not be less than the thread root diameter.
What types of loads can a snubber restrain?
a) Thermal and gravity loads
b) Seismic, water hammer, steam hammer, or relief valve thrust
c) Corrosion and fatigue stresses
d) Axial and torsional loads
Seismic, water hammer, steam hammer, or relief valve thrust
What is the advantage of using a snubber over a rigid support?
a) It is lighter in weight
b) It can restrain thermal loads better
c) It allows thermal displacement while restraining dynamic loads
d) It provides continuous support to the pipe
It allows thermal displacement while restraining dynamic loads
How does a snubber behave under the slow and gradual displacement of a pipe due to thermal action?
a) It locks up to prevent movement
b) It slowly telescopes to accommodate the movement
c) It provides rigid restraint to the pipe
d) It increases the load on the pipe
It slowly telescopes to accommodate the movement
What happens when a sudden impact load acts upon a snubber?
a) It telescopes further to absorb the load
b) It locks up and acts as a rigid restraint
c) It fails and allows pipe movement
d) It supports gravity loads
It locks up and acts as a rigid restraint
What must be considered when determining the distribution of riser weight?
a) The type of insulation used
b) The thermal conductivity of the pipe
c) Whether the weight is taken by one support or distributed among several supports
d) The size and thickness of the riser clamp
Whether the weight is taken by one support or distributed among several supports
Why must hydrostatic test conditions be analyzed for riser supports?
a) To ensure cold-water-filled conditions do not impose stresses higher than allowable
b) To determine the insulation thickness required
c) To confirm compatibility with NFPA codes
d) To prevent the pipe from tipping
To ensure cold-water-filled conditions do not impose stresses higher than allowable
What should be done if vertical movement in a riser exists during operation?
a) Use shorter support arms to limit movement
b) Assume the entire load may transfer to one support rod and design for twice the load
c) Install rigid supports with no horizontal movement allowance
d) Increase the insulation thickness to absorb movement
Assume the entire load may transfer to one support rod and design for twice the load
Why are welded lugs often used in riser supports?
a) To provide clearance for insulation and springs
b) To ensure positive engagement between the pipe and the clamp, overcoming thermal changes
c) To increase the flexibility of the pipe during thermal expansion
d) To prevent horizontal movement of the riser
To ensure positive engagement between the pipe and the clamp, overcoming thermal changes
What should be done if there is a risk of electrolysis between the copper tubing and its support?
a) Use thicker tubing
b) Line the support to prevent electrolysis
c) Avoid using supports for copper tubing
d) Use supports made from the same material as the tubing
Line the support to prevent electrolysis
Which of the following is a standard governing sprinkler systems in fire protection?
a) NFPA 11
b) NFPA 13
c) NFPA 14
d) NFPA 17
NFPA 13
What is the purpose of sway bracing in fire protection systems?
a) To prevent corrosion of the supports
b) To stabilize the pipe and prevent unwanted movement
c) To maintain proper slope for drainage
d) To reduce pipe vibration
To stabilize the pipe and prevent unwanted movement
Which organizations test and approve supports for fire protection systems?
a) National Fire Protection Association and ANSI
b) Underwriters’ Laboratories, Inc., and Factory Mutual Engineering Division
c) OSHA and Factory Mutual Insurance
d) ISO and Canadian Standards Association
Underwriters’ Laboratories, Inc., and Factory Mutual Engineering Division
What is the recommended spacing for supports for rigid plastic pipes?
a) Equal to steel pipe spacing
b) Half the spacing used for steel pipes
c) Double the spacing used for steel pipes
d) Based only on pipe diameter
Half the spacing used for steel pipes
What temperature should parts of hangers and supports in direct contact with the pipe be designed to?
a) Room temperature
b) The temperature of the fluid in the pipe
c) A temperature 100°F lower than the fluid temperature
d) 100°F higher than the fluid temperature
The temperature of the fluid in the pipe
What is the primary purpose of protective coatings on pipe supports?
a) To increase pipe strength
b) To improve the appearance of the supports
c) To provide corrosion resistance
d) To reduce the weight of the supports
To provide corrosion resistance
When storing hanger components, what should be done to protect them?
a) Store them in a dry area
b) Store them in a locked container
c) Protect them from dirt and water
d) Apply an additional coating
Protect them from dirt and water
What should be done to hanger rod threads before assembly?
a) Lubricate them with grease for easy adjustability
b) Paint them to prevent rust
c) Tighten them to maximum torque
d) Coat them with plastic for protection
Lubricate them with grease for easy adjustability
What should be ensured before taking up the full load on the hanger rods?
a) The spring is installed
b) The minimum thread engagement is achieved
c) The support is locked in place
d) The load is balanced
The minimum thread engagement is achieved
What should be done after completing all adjustments to the hanger components?
a) Tighten all nuts and bolts
b) Lock all required items using locknuts, retainers, or clips
c) Check for any loose connections
d) Test the load capacity of the support
Lock all required items using locknuts, retainers, or clips
When should travel stops be removed from the spring?
a) After installing the support
b) Prior to operation, to allow the spring to move freely
c) Before testing the pipeline
d) After securing the locknuts
Prior to operation, to allow the spring to move freely
Which of the following should be verified prior to operation?
a) Only the locknuts are secure
b) The travel and load positions for springs
c) The minimum pipe diameter
d) The spring’s maximum load capacity
The travel and load positions for springs
What must be done to threaded items before operation?
a) Apply a lubricant to the threads
b) Ensure the minimum thread engagement is met
c) Ensure the threads are coated with paint
d) Replace the threads if damaged
Ensure the minimum thread engagement is met
