# Flo Fab Centrifugal Pump Fundamentals #1

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Centrifugal pumps are used to induce flow and or raise a liquid from a low level to a high level. The process and science behind how they work forms the basis of this quiz. How well do you understand the ‘magic’ behind the Flo fab centrifugal pump and its fundamentals? You have 20 minutes to finish. All the best as you learn!

• 1.

• 2.

### Given a pressure gauge reading of 100 PSIG for a fluid that weighs 2 times as much as water yet with the same viscosity as water, calculate the Head of Water Equivalent.

• A.

150 ft

• B.

73.5 ft

• C.

115.5 ft

• D.

125 ft

C. 115.5 ft
Explanation
The pressure gauge reading of 100 PSIG indicates the pressure exerted by the fluid. Since the fluid weighs 2 times as much as water and has the same viscosity, it can be assumed that the fluid is denser than water. The head of water equivalent is a measure of the height of a column of water that would exert the same pressure as the fluid. Therefore, the head of water equivalent can be calculated using the formula: Head = Pressure / (Density x Gravity). Since the fluid is denser than water, its density is greater than that of water. As a result, the head of water equivalent will be greater than the actual height of the fluid. The correct answer of 115.5 ft suggests that the head of water equivalent is higher due to the increased density of the fluid.

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• 3.

### Water has filled a 2” vertical pipe that is 115.5 feet tall. If a gauge was installed at the bottom of the pipe, what would the gauge pressure be?

• A.

40 psi

• B.

50 psi

• C.

55 psi

• D.

60 psi

B. 50 psi
Explanation
The gauge pressure at the bottom of the pipe would be 50 psi. Gauge pressure is the pressure measured relative to atmospheric pressure, and it is determined by the height of the fluid column above the gauge. In this case, the height of the water column is 115.5 feet, which is equivalent to approximately 50 psi of pressure.

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• 4.

### In Q2, what is this “head” called?

• A.

• B.

• C.

• D.

TDH

Explanation
The correct answer is "Static Head". In fluid mechanics, the term "head" refers to the height or pressure of a fluid column above a reference point. Static head specifically refers to the height or pressure of a fluid column when it is not in motion or flowing. It represents the potential energy of the fluid due to its elevation.

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• 5.

### What does “BEP” stand for?

• A.

Basic Energy Parameter

• B.

Best Energy Potential

• C.

Best Efficiency Point

• D.

Black Eyed Peas

C. Best Efficiency Point
Explanation
BEP stands for Best Efficiency Point. This term refers to the operating point at which a system or device achieves its highest efficiency. It represents the optimal operating conditions where the system or device can convert the maximum amount of input energy into useful output energy. This is an important parameter to consider when designing and optimizing energy systems to ensure optimal performance and energy utilization.

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• 6.

### Fill in the blank: A pump operates where it intersects the _________curve.

• A.

System

• B.

Pump

• C.

Tangential

• D.

Velocity

A. System
Explanation
A pump operates where it intersects the system curve. This means that the pump is designed to operate at a specific point on the system curve, which represents the relationship between the pump's flow rate and the system's head loss. The system curve takes into account factors such as pipe friction and elevation changes, and the pump must be selected to operate at the intersection point to ensure efficient and effective pumping.

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• 7.

### Witch line on the graph is the performance curve?

• A.

Green line

• B.

Brown line

• C.

Blue line

• D.

Purple line

C. Blue line
Explanation
The blue line on the graph represents the performance curve.

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• 8.

### Witch line on the graph is the Horsepower curve?

• A.

Green line

• B.

Purple line

• C.

Blue line

• D.

Brown line

D. Brown line
Explanation
The correct answer is the Brown line. This can be determined by looking at the graph and identifying the line that represents the Horsepower curve.

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• 9.

### What would be nearest answer for the “shut-off head” for this pump using a  12” impeller trim ?

• A.

152 ft

• B.

130 ft

• C.

200 ft

• D.

120 ft

• E.

90 ft

A. 152 ft
Explanation
The shut-off head refers to the maximum head pressure that a pump can generate when it is not pumping any fluid. In this case, the nearest answer for the shut-off head with a 12" impeller trim would be 152 ft.

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• 10.

### What does NPSHa mean?

• A.

• B.

• C.

• D.

D. Net Positive Suction Head Available
Explanation
NPSHa stands for Net Positive Suction Head Available. It is a term used in fluid dynamics to measure the pressure at the suction side of a pump. It represents the amount of pressure available to prevent the formation of vapor or cavitation in the pump. NPSHa is calculated by subtracting the vapor pressure of the liquid from the total suction head, taking into account any losses due to friction or elevation. It is an important parameter to ensure the proper functioning and efficiency of a pump system.

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• 11.

### What does NPSHr mean?

• A.

• B.

• C.

• D.

D. Net Positive Suction Head Required
Explanation
NPSHr stands for Net Positive Suction Head Required. It is a term used in fluid mechanics to measure the amount of pressure required at the suction side of a pump to prevent cavitation. Cavitation occurs when the pressure at the suction side of the pump drops below the vapor pressure of the liquid, causing the formation of vapor bubbles that can damage the pump and reduce its efficiency. Therefore, NPSHr is an important parameter to ensure proper pump operation and avoid cavitation.

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• 12.

### What happens when NPSHr is more than NPSHa?

• A.

Cavitation

• B.

Nothing

• C.

Water hammer

• D.

Implosion

A. Cavitation
Explanation
When NPSHr (Net Positive Suction Head Required) is greater than NPSHa (Net Positive Suction Head Available), it leads to cavitation. Cavitation occurs when the pressure at the suction side of a pump drops below the vapor pressure of the fluid, causing the formation and collapse of vapor bubbles. This can result in damage to the pump impeller and decrease its efficiency. Therefore, when NPSHr is higher than NPSHa, cavitation is the likely outcome.

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• 13.

### Regarding pump component failures, about what percentage of failures are related to the mechanical seal?

• A.

49%

• B.

59%

• C.

69%

• D.

79%

C. 69%
Explanation
The correct answer is 69%. This suggests that a significant percentage of pump component failures are related to the mechanical seal. It implies that issues with the mechanical seal, such as leaks or malfunctions, are a common cause of pump failures. This highlights the importance of properly maintaining and monitoring the mechanical seal to prevent potential failures and ensure the efficient operation of the pump.

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• 14.

### Regarding pump causes of failures, what percentage is caused by the seal components?

• A.

9%

• B.

19%

• C.

29%

• D.

39%

A. 9%
Explanation
The correct answer is 9%. This suggests that only a small percentage of pump failures are caused by issues with the seal components. This implies that the majority of pump failures are likely due to other factors such as mechanical issues, electrical problems, or issues with other components of the pump. It is important to address and monitor these seal components to minimize failures, but they are not the primary cause in most cases.

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• 15.

### Operating a centrifugal pump at low flow does not cause damage?

• A.

True

• B.

False

A. True
Explanation
Operating a centrifugal pump at low flow does not cause damage because centrifugal pumps are designed to operate efficiently at a wide range of flow rates. At low flow rates, the pump may experience lower efficiency and increased wear due to reduced lubrication and increased heat generation. However, it does not cause significant damage as long as the pump is not operated at zero flow or run dry for an extended period.

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• 16.

### To make a pipe size transition at the pump suction always use a concentric reducer, it looks better?

• A.

True

• B.

False

B. False
Explanation
The correct answer is False because the main purpose of using a concentric reducer at the pump suction is not for aesthetic reasons. It is used to maintain a smooth flow of fluid by gradually reducing the pipe size, preventing turbulence and pressure drop. Additionally, a concentric reducer ensures proper alignment and reduces the risk of cavitation in the pump.

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• 17.

### Can the pressure at the pump suction be less than atmospheric pressure?

• A.

No

• B.

Yes

A. No
Explanation
The pressure at the pump suction cannot be less than atmospheric pressure because the pump relies on atmospheric pressure to push the fluid into the pump. If the pressure at the pump suction is less than atmospheric pressure, the fluid will not be able to enter the pump and the pump will not be able to function properly.

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• 18.

### What is the first thing you have to do, to price a job after login in our web site ?

• A.

Call Flo Fab

• B.

Check delivery

• C.

Start a new quote

• D.

Select a pump selection

C. Start a new quote
Explanation
To price a job after logging in on the website, the first step is to start a new quote. This implies that initiating a new quote is the initial action required to determine the pricing for a job.

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• 19.

### How many types of documents do you need to send FLOFAB to price a package ?

• A.

2

• B.

None

• C.

6

• D.

3

C. 6
Explanation
To price a package, FLOFAB requires six types of documents to be sent. These documents are necessary for accurate pricing and may include information such as weight, dimensions, contents, destination, and any special handling requirements. By receiving all the relevant documents, FLOFAB can determine the appropriate pricing for the package based on these factors.

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• 20.

### Do I need to start a quote before contacting FLOFAB ?

• A.

Yes

• B.

No

A. Yes
Explanation
Starting a quote before contacting FLOFAB is necessary. This implies that before reaching out to FLOFAB, it is required to initiate a quotation process. This could involve providing details about the specific product or service needed, quantity, and any other relevant information. Starting a quote helps in obtaining accurate pricing and ensuring that all requirements are met by FLOFAB.

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• 21.

### In order to get engineered shop Drawing what do I need to do ?

• A.

Call the regional Manager

• B.

Call marc

• C.

Send a written Purchase order subject to approval to Moe and Chris

• D.

Send an e mail to FLOFAB

C. Send a written Purchase order subject to approval to Moe and Chris
Explanation
To obtain an engineered shop drawing, the correct step to take is to send a written purchase order subject to approval to Moe and Chris. This implies that Moe and Chris are responsible for handling the requests for engineered shop drawings. By sending a purchase order, it ensures that the request is formalized and subject to approval, indicating that the process is regulated and requires authorization before proceeding with the drawings.

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• 22.

### Does FLOFAB have a YouTube channel with  information how to do a Quote ?

• A.

True

• B.

False

A. True
Explanation
The given answer is true because it states that FLOFAB has a YouTube channel with information on how to do a quote. This implies that FLOFAB has a presence on YouTube and provides instructional content related to the process of creating a quote.

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• 23.

### Does FLOFAB have a quoting department for quoting standard pumps ?

• A.

YES

• B.

NO

B. NO
Explanation
The answer is NO because the question asks if FLOFAB has a quoting department for quoting standard pumps. Since the answer is NO, it implies that FLOFAB does not have a quoting department for quoting standard pumps.

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• 24.

### Does FLOFAB have a quick ship program ?

• A.

Yes

• B.

No

A. Yes
Explanation
The given answer "Yes" suggests that FLOFAB does have a quick ship program. This means that customers can expect their orders to be shipped quickly, possibly resulting in faster delivery times.

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• 25.

### Who should I contact at FLOFAB for order status and delivery updates ?

B. [email protected] Chris
Explanation
Chris at FLOFAB is the person to contact for order status and delivery updates.

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Jul 11, 2016
Quiz Created by
Marc

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