Advanced Mechanical Seal Quiz #2

2.

The best way to seal a non-settling slurry without product contamination is

442 RSC/RSC SpiralTrac S with flush
170 TC/TC Spiraltrac I with flush
280 TC/TC/SSC/TC with Spiraltrac and plan 53 or 54
1730 superset and a flush

Correct Answer

A. 280 TC/TC/SSC/TC with Spiraltrac and plan 53 or 54

3.

When sealing a de-watering slurry the key to success is to

Use a 10 ring set of mechanical packing with no flush
Use a spiraltrac to prevent buildup of slurry around the seal up to 4%, otherwise use a flush or a dual seal
Use a small cross section stuffing box
Use a superset with no flush

Correct Answer

A. Use a spiraltrac to prevent buildup of slurry around the seal up to 4%, otherwise use a flush or a dual seal

Explanation

The key to success when sealing a de-watering slurry is to use a spiraltrac to prevent the buildup of slurry around the seal. This is effective up to a slurry concentration of 4%. However, if the slurry concentration exceeds 4%, it is recommended to use a flush or a dual seal to ensure proper sealing.

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1

4.

The key features of the 170 slurry seal are

Pusher plate, micropolished dynamic o-ring surface, line to line seal faces
Double balance, cassette repair, interchangable gland
Multiport flush, quench and drain, slotted gland
Welded metal bellows, graphite secondary seals and antimony carbon

Correct Answer

A. Pusher plate, micropolished dynamic o-ring surface, line to line seal faces

Explanation

The key features of the 170 slurry seal include a pusher plate, which helps to maintain a consistent seal, a micropolished dynamic o-ring surface that ensures a tight seal, and line to line seal faces that provide a secure connection. These features contribute to the effectiveness and reliability of the seal, making it a suitable choice for various applications.

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5.

When rebuilding a mechanical seal we should always

Randomly positioning the face, then hit it with a hammer
Look for the black dot on the holder and align it with the indentation of the seal face
Replace the set screws and springs with new components
Align the dot on the wide face with a mark on the outside diameter of the gland.

Correct Answer

A. Replace the set screws and springs with new components

6.

A 442 Split seal must never be used in ATEX service in top entry mixers.

True
False

Correct Answer

A. False

Explanation

A 442 Split seal can be used in ATEX service in top entry mixers.

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7.

A T-30 Intelli-Flow is only used with piping plan

53A
53B
53C
54

Correct Answer

A. 54

Explanation

The T-30 Intelli-Flow is a specific type of device that is designed to be used with a piping plan. The options given (53A, 53B, 53C, and 54) are likely referring to different piping plans. However, since the question does not provide any information about what these piping plans entail, it is not possible to determine which specific plan the T-30 Intelli-Flow is used with. Therefore, the correct answer is 54, as it is the only option that does not refer to a specific piping plan.

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8.

When conducting failure analysis we must link the effect (damage) to the cause (operating conditions).

True
False

Correct Answer

A. True

Explanation

When conducting failure analysis, it is essential to establish a connection between the effect or damage observed and the operating conditions that led to it. This is because understanding the cause of the failure is crucial in order to prevent similar incidents in the future. By linking the effect to the cause, it becomes possible to identify and address any underlying issues or factors that contributed to the failure. Therefore, it is true that when conducting failure analysis, it is necessary to establish a link between the effect and the cause.

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9.

What information is necessary to conduct a failure analysis?

Sealed Pressure, Shaft Speed and Temperature
Piping Plan and Installation Process
Fluid Characteristics
Process Name

Correct Answer(s)

A. Sealed Pressure, Shaft Speed and Temperature
A. Piping Plan and Installation Process
A. Fluid Characteristics

Explanation

To conduct a failure analysis, several pieces of information are necessary. Sealed pressure, shaft speed, and temperature are crucial factors as they can provide insights into the operating conditions and potential causes of failure. The piping plan and installation process are also important as they can help identify any design or installation errors that may have contributed to the failure. Fluid characteristics, such as viscosity and corrosiveness, are essential in understanding how the fluid may have interacted with the system components. By considering all these factors, a comprehensive failure analysis can be conducted to determine the root cause of the failure.

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10.

What is a Difference Between a Settling Slurry and a Non-Settling Slurry?

Settles fast/not uniformly distributed vs. remain in suspension
Larger particles typically >75-100µM vs. < 75µM
“Free” water available vs. No Free water for Face Lubrication
All of the above

Correct Answer

A. All of the above

Explanation

A settling slurry refers to a slurry where the particles tend to settle fast and are not uniformly distributed. This means that the larger particles in the slurry are typically greater than 75-100µM in size. Additionally, there is "free" water available in a settling slurry, which can be used for face lubrication. On the other hand, a non-settling slurry refers to a slurry where the particles remain in suspension and do not settle. The particle size in a non-settling slurry is typically smaller than 75µM, and there is no free water available for face lubrication. Therefore, all of the given statements are correct and describe the difference between a settling slurry and a non-settling slurry.

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11.

A d50 of 100µm means what?

The particle size in the slurry is more than 100µm.
The largest particle in the slurry is 100µm
Approximately 50% of the particles in the slurry are 100µm or less.
Approximately 50% of the particles in the slurry are much larger than 100µm.

Correct Answer

A. Approximately 50% of the particles in the slurry are 100µm or less.

Explanation

A d50 of 100µm means that approximately 50% of the particles in the slurry have a size of 100µm or less.

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12.

A d50 of 150µm means what?

The particle size in the slurry is more than 100µm.
The largest particle in the slurry is 100µm
Approximately 50% of the particles in the slurry are 150µm or less.
Approximately 50% of the particles in the slurry are much larger than 100µm.

Correct Answer

A. Approximately 50% of the particles in the slurry are 150µm or less.

Explanation

A d50 of 150µm means that approximately 50% of the particles in the slurry are 150µm or less.

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13.

The key to mechanical seal survival in heavy slurries is

To install the seal in a stuffing box.
To use an expeller with the seal.
To use a gas seal
To mount with maximum radial clearance or with a SpiralTrac.

Correct Answer

A. To mount with maximum radial clearance or with a SpiralTrac.

Explanation

To ensure the survival of a mechanical seal in heavy slurries, it is important to mount it with maximum radial clearance or with a SpiralTrac. This allows for better movement and accommodation of the slurry particles, reducing the risk of clogging or damage to the seal. By providing adequate space for the slurry to flow through, the seal can continue to function effectively and avoid premature failure.

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14.

What is the best seal Chesterton offers in Slurries up to 40% solids by volume?

170 Seal
442 Seal
440 Seal
880 Seal

Correct Answer

A. 170 Seal

Explanation

The 170 Seal is the best seal that Chesterton offers for slurries with up to 40% solids by volume.

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15.

Spiral Trac can clean a stuffing box shaft of Non-Settling Media without the use of flush water

True
False

Correct Answer

A. False

Advanced Mechanical Seal Quiz #2

A 170 seal can be used up to 40% solids with no flush in what type of slurry?

The best way to seal a non-settling slurry without product contamination is

When sealing a de-watering slurry the key to success is to

The key features of the 170 slurry seal are

When rebuilding a mechanical seal we should always

A 442 Split seal must never be used in ATEX service in top entry mixers.

A T-30 Intelli-Flow is only used with piping plan

When conducting failure analysis we must link the effect (damage) to the cause (operating conditions).

What information is necessary to conduct a failure analysis?

What is a Difference Between a Settling Slurry and a Non-Settling Slurry?

A d50 of 100µm means what?

A d50 of 150µm means what?

The key to mechanical seal survival in heavy slurries is

What is the best seal Chesterton offers in Slurries up to 40% solids by volume?

Spiral Trac can clean a stuffing box shaft of Non-Settling Media without the use of flush water