A9 Flashcards by Lino Janay Jr.

What is the pressfit piping system primarily designed for?
a) Large-bore piping systems
b) Small-bore piping systems (NPS ½ to NPS 2)
c) High-pressure gas transmission
d) Underground sewage systems

Small-bore piping systems (NPS ½ to NPS 2)

How well did you know this?

Not at all

Perfectly

What is the pressure rating for Pressfit joints used in general service systems?
a) 150 psi
b) 200 psi
c) 300 psi
d) 400 psi

300

How well did you know this?

Not at all

Perfectly

What type of groove is created by machining a groove in the pipe end?
a) Cut groove
b) Rolled groove
c) Threaded groove
d) Welded groove

Cut groove

How well did you know this?

Not at all

Perfectly

What is a major advantage of the grooved piping method?
a) Requires specialized welding tools
b) Easy assembly and disassembly
c) Does not support high-pressure systems
d) Limited to metallic pipes only

Easy assembly and disassembly

How well did you know this?

Not at all

Perfectly

What type of pipe preparation is required for Pressfit joints?
a) Welding
b) Threading
c) Square cut, plain-end
d) Flanging

Square cut, plain-end

How well did you know this?

Not at all

Perfectly

What is the recommended expansion compensation method for rigid Pressfit systems?
a) Thermal welding
b) Flexible mechanical coupling
c) Threaded connections
d) Reduced pipe thickness

Flexible mechanical coupling

How well did you know this?

Not at all

Perfectly

Which type of grooved joint is recommended for pipes with walls thinner than standard weight?
a) Cut groove
b) Rolled groove
c) Threaded groove
d) Welded groove

Rolled groove

How well did you know this?

Not at all

Perfectly

What is the main sealing component of a grooved pipe joint?
a) Metal coupling
b) Elastomeric gasket
c) Welded flange
d) Threaded fitting

Elastomeric gasket

How well did you know this?

Not at all

Perfectly

What is the main advantage of flexible couplings in a piping system?
A) They create a rigid connection
B) They allow for controlled pipe movement
C) They are less expensive than other types
D) They require no maintenance

They allow for controlled pipe movement

How well did you know this?

Not at all

Perfectly

Flexible couplings reduce stress caused by which factors?
A) Electrical surges
B) Thermal changes and seismic activity
C) External impacts
D) Corrosion

Thermal changes and seismic activity

How well did you know this?

Not at all

Perfectly

What feature of flexible couplings helps minimize noise and vibration transmission?
A) Rigid clamping
B) Elastomeric gasket
C) Metal housing
D) Expansion loops

Elastomeric gasket

How well did you know this?

Not at all

Perfectly

In what situation would rigid couplings be preferred over flexible couplings?
A) In areas with high seismic activity
B) For long piping runs with no branches
C) In mechanical rooms to control piping motion
D) In underground pipelines

In mechanical rooms to control piping motion

How well did you know this?

Not at all

Perfectly

What should a piping system designer consider when selecting a grooved joint gasket?
A) The size of the pipe only
B) Temperature and service conditions
C) Color of the gasket
D) Cost of the gasket

Temperature and service conditions

How well did you know this?

Not at all

Perfectly

Why is proper gasket selection important in grooved piping systems?
A) It increases the aesthetic appeal
B) It ensures maximum life and performance
C) It eliminates the need for flexible couplings
D) It reduces the overall cost of the system

It ensures maximum life and performance

How well did you know this?

Not at all

Perfectly

What is the primary purpose of using synthetic rubber gaskets in grooved piping products?
A) To provide a tight seal
B) To add flexibility to the pipe
C) To reduce the weight of the piping system
D) To enhance the appearance

To provide a tight seal

How well did you know this?

Not at all

Perfectly

What is the consequence of exceeding temperature limits of gasket materials?
A) Increased system efficiency
B) Degrading effect on the polymer
C) Enhanced durability
D) Reduced noise levels

Degrading effect on the polymer

How well did you know this?

Not at all

Perfectly

What is the significance of pressure-temperature ratings in grooved mechanical pipe joints?
A) They determine the color of the pipe
B) They are used to select the right piping material
C) They ensure the piping system can withstand specific pressures and temperatures
D) They are not relevant to the design process

They ensure the piping system can withstand specific pressures and temperatures

How well did you know this?

Not at all

Perfectly

What does the term “free-floating system” refer to in piping design?
A) A system that uses only rigid couplings
B) A system allowed to thermally expand or contract without expansion joints
C) A system completely fixed in place
D) A system with no supports

A system allowed to thermally expand or contract without expansion joints

How well did you know this?

Not at all

Perfectly

How can a piping system designer prevent harmful bending moments at branch connections?
A) By ignoring pressure thrusts
B) By anchoring the system and directing movements
C) By using only flexible couplings
D) By reducing the pipe diameter

By anchoring the system and directing movements

What is one characteristic of flexible grooved-type couplings that must be considered during design?
A) They are completely rigid
B) They have linear and angular movement capabilities
C) They do not require any maintenance
D) They increase system rigidity

They have linear and angular movement capabilities

What should be considered when positioning hangers in systems using flexible couplings?
A) The weight of the pipes
B) The color of the pipes
C) The angular and rotational movement at joints
D) The diameter of the pipes

The angular and rotational movement at joints

What must be done if joints in a piping system are to remain deflected?
A) Use lighter hangers
B) Allow joints to move freely
C) Anchor the lines to restrain pressure thrusts
D) Ignore lateral forces

Anchor the lines to restrain pressure thrusts

In a grooved piping system, what is necessary when anticipating simultaneous linear and angular movements?
A) Increase the pipe diameter
B) Install additional joints to accommodate both movements
C) Use rigid couplings only
D) Decrease the number of hangers

Install additional joints to accommodate both movements

What is the role of lateral restraint in anchored systems with deflected joints?
A) To reduce the number of supports
B) To prevent sideways movement due to pressure thrusts
C) To increase the flexibility of the system
D) To eliminate the need for anchors

To prevent sideways movement due to pressure thrusts

When designing for thermal movement in grooved piping systems, what is the first step? A) Estimate the pipe material cost B) Compute the exact change in the linear length of the piping system C) Select the color of the pipe D) Install all rigid couplings

Compute the exact change in the linear length of the piping system

What is a benefit of using flexible couplings in expansion loops? A) They increase pipe rigidity B) They absorb thermal growth and contraction C) They eliminate the need for hangers D) They are cheaper than rigid couplings

They absorb thermal growth and contraction

Why should rigid couplings not be used in expansion loops? A) They are difficult to install B) They cannot accommodate angular deflection C) They are more expensive D) They require more maintenance

They cannot accommodate angular deflection

Where should the expansion loop ideally be located in relation to an anchor? A) At the farthest point from the anchor B) Adjacent to the anchor within four pipe diameters C) Exactly in the middle of the pipeline D) It doesn't matter where it's located

Adjacent to the anchor within four pipe diameters

What must be done to accommodate thermal expansion if the anticipated movement exceeds the capacity of the flexible joints? A) Increase the pipe diameter B) Install additional expansion joints C) Reduce the operating temperature D) Decrease the number of flexible couplings

Install additional expansion joints

Why is it essential to consider the actual expansion coefficients for different pipe materials? A) They help in selecting the right color for the pipes B) Different materials have varying expansion rates C) All materials have the same expansion rate D) Expansion coefficients are irrelevant

Different materials have varying expansion rates

In the calculation of thermal movement, what factors need to be considered? A) Pipe color and diameter B) Pipe length and temperature changes C) Manufacturer's brand and cost D) Installation date and pipe thickness

Pipe length and temperature changes

What is the purpose of aligning guides in an expansion loop? A) To reduce the number of required couplings B) To ensure proper pipe alignment C) To eliminate the need for hangers D) To prevent thermal expansion

To ensure proper pipe alignment

What is the purpose of main anchors in piping systems? A. To allow free movement of pipes B. To prevent movement due to pressure thrust and thermal growth C. To guide the direction of pipelines D. To act as decorative elements

To prevent movement due to pressure thrust and thermal growth

Where are main anchors typically installed? A. Randomly along the pipeline B. At or near terminal points and changes in pipe direction C. Only at pipe bends D. In the middle of long pipelines

At or near terminal points and changes in pipe direction

What is the main role of intermediate anchors? A. To prevent thermal expansion B. To divide a long pipe run into individual expanding sections C. To provide decorative support D. To eliminate the need for main anchors

To divide a long pipe run into individual expanding sections

What happens to pressure thrust on intermediate anchors? A. It doubles B. It cancels each other out C. It gets redirected to main anchors D. It causes structural damage

It cancels each other out

What is necessary to prevent piping from being forced inside by pressure thrust? A. Flexible couplings B. A pressure thrust anchor C. Lateral bracing D. Rigid pipes

A pressure thrust anchor

Why might intermediate anchors be required in piping systems? A. To manage pipe color coordination B. To support and guide the pipe against movement C. To reduce pipe diameter D. To replace main anchors

To support and guide the pipe against movement

What should be used where thermal movement of pipes is significant? A. Flexible couplings B. Rigid joints C. Plastic piping D. Decorative anchors

Flexible couplings

Where should a main thrust anchor be located in a riser with branch connections? A. At the midpoint B. At or near the base of the riser C. At the top of the riser D. At every branch connection

At or near the base of the riser

What spacing is recommended for intermediate anchors between upper and lower anchors? A. Every branch length B. Every other branch length C. Every two meters D. Every coupling length

Every other branch length

What does thermal movement in pipes require? A. Reduction of pipe diameter B. Allowance for expansion C. Elimination of anchors D. Installation of rigid pipes only

Allowance for expansion

Why is guidance necessary for risers without branch connections? A. To increase pressure B. To prevent buckling of the riser C. To reduce installation time D. To lower pipe costs

To prevent buckling of the riser

Why is flexibility important in piping systems? A. To accommodate structural misalignment B. To minimize thermal expansion C. To prevent system vibration D. All of these

All of these

How can grooved piping systems benefit earthquake-prone areas? A. By being inexpensive to install B. By reducing vibration transmission C. By eliminating pipe supports D. By increasing system rigidity

By reducing vibration transmission

What is the role of sway bracing in seismic design? A. To remove vibration entirely B. To limit pipe movement during seismic events C. To reduce system installation time D. To increase pipe pressure

To limit pipe movement during seismic events

What is a critical practice in seismic design for piping systems? A. Adding extra weight B. Aligning pipes with the building structure C. Removing all flexible joints D. Minimizing pipe length

Aligning pipes with the building structure