Level 1 - Mechanical Seals Quiz #3

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Seals Quiz 3

• 1.

What is the main difference between the 280 and the 255 dual cartridge mechanical seal?

• A.

The 280 has a higher pressure rating

• B.

The 255 is monolithic

• C.

The 280 has a pumping ring

• D.

The 280 uses direct centering

D. The 280 uses direct centering
Explanation
The main difference between the 280 and the 255 dual cartridge mechanical seal is that the 280 uses direct centering. This means that the seal is centered directly on the shaft, providing more stability and accuracy in its performance. On the other hand, the 255 seal does not use direct centering.

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• 2.

What is the main difference between an S20 and a 250 mechanical seal?

• A.

Cassette versus Cartridge

• B.

Both are tandem seals

• C.

Dual seal versus split seal

• D.

Two barrier fluid ports versus 8 barrier ports

A. Cassette versus Cartridge
Explanation
The main difference between an S20 and a 250 mechanical seal is the type of seal used. The S20 uses a cassette seal, while the 250 uses a cartridge seal. The cassette seal is a single unit that contains all the necessary components, such as the seal faces and springs, in a compact design. On the other hand, the cartridge seal is modular and allows for easy replacement of individual components. This difference in design affects the ease of installation and maintenance of the seals.

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• 3.

If L1 = 1.000 inches, L2 = 3.000 Inches, D2 =1.875 Inches, D3 = 2.875 inches, D5 = .375 inches, D4 = 4.500 inches will a S20 fit this seal chamber? Note - D dimensions are shown as radius, but are expressed as diameter dimension.

• A.

Yes

• B.

No

B. No
Explanation
The S20 will not fit this seal chamber because the diameter of D4 is 4.500 inches, which is larger than the maximum diameter of the S20.

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• 4.

Which is not an O-ring size used in a S20 -15 (1.875 inch) dual seal?

• A.

-136

• B.

-134

• C.

-141

• D.

-137

D. -137
Explanation
The given question is asking for an O-ring size that is not used in a S20 -15 (1.875 inch) dual seal. The correct answer is -137. This means that -137 is not a valid O-ring size for this specific seal.

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• 5.

What is the US suggested list price and item number for a 255 -17 SA SSC/CB/SSC/CB 316SS FKM?

• A.

3387.00 690255

• B.

2866.00 666018

• C.

2891.00 666020

• D.

4909.00 680000

B. 2866.00 666018
Explanation
The correct answer, 2866.00 666018, is the US suggested list price and item number for a 255 -17 SA SSC/CB/SSC/CB 316SS FKM.

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• 6.

What is the minimum pressure requirement when providing barrier fluid?

• A.

1-2 Psi above stuffing box pressure

• B.

7-8 Psi above atmospheric pressure

• C.

20 - 30 Psi (Or 2 BAR above stuffing box pressure)

• D.

1-2 Psi lower than stuffing box pressure

C. 20 - 30 Psi (Or 2 BAR above stuffing box pressure)
Explanation
The minimum pressure requirement when providing barrier fluid is 20-30 Psi (or 2 BAR above stuffing box pressure). This ensures that there is enough pressure to prevent the process fluid from leaking into the barrier fluid and causing damage to the equipment. Higher pressure helps to create a reliable barrier between the process fluid and the barrier fluid, reducing the risk of contamination and maintaining the integrity of the system.

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• 7.

Which mechanical seal models are designed to allow motion?

• A.

225 and S20

• B.

250 and S20

• C.

255 and 280

• D.

S20 and S10

C. 255 and 280
Explanation
The mechanical seal models 255 and 280 are designed to allow motion.

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• 8.

The least expensive Chesterton dual mechanical seal is the 250.

• A.

True

• B.

False

A. True
Explanation
The given statement is true because it states that the least expensive Chesterton dual mechanical seal is the 250. This implies that there are other more expensive options available, but the 250 is the most affordable among them.

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• 9.

Which seal models use monolithic seal faces? (Note: Answer can be multiple choices)

• A.

280

• B.

255

• C.

S20

• D.

250

A. 280
B. 255
C. S20
Explanation
The seal models that use monolithic seal faces are 280, 255, and S20.

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• 10.

The key feature of the 280 versus the 255 mechanical is the

• A.

Monolithic seal faces

• B.

Slotted gland

• C.

Direct centering clips

• D.

Motion capability