Level 1 Mechanical Seal Final Exam

PTFE, also known as Teflon, is a synthetic material that has several unique properties. It is known for its low coefficient of friction, which means it has a reduced tendency to create friction when in contact with other surfaces. PTFE also has a high thermal stability, allowing it to withstand high temperatures without degrading. However, PTFE does not have an oxidation limit of 800 F. This means that it cannot withstand exposure to temperatures above 800 F without undergoing oxidation, which can lead to degradation and reduced performance.

The US suggested list price of a 170 -32 SSC/TC FKM (unfinished) is $6383.00.

The correct answer is 639764 $3195.00. This answer corresponds to the list price and re-order number for a 442M-20 RSC/CB FKM.

The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary Unit uses non-metallic material in the sealed fluid, while the 891 Rotary Unit uses metal.

The key feature of the 280 mechanical compared to the 255 mechanical is the use of direct centering clips. This means that the 280 mechanical has a mechanism that allows for precise and accurate centering of the components, ensuring optimal performance and reducing the chances of any misalignment or damage. This feature enhances the overall functionality and reliability of the 280 mechanical compared to the 255 mechanical.

The main difference between a 440 Rotary and 891 Rotary Unit is that the 440 Rotary Unit has a non-metallic material in the sealed fluid, while the 891 Rotary Unit has a metal material in the sealed fluid.

The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary uses non-metallic material, while the 891 Rotary Unit uses metal.

The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary Unit uses non-metallic material, while the 891 Rotary Unit uses metal.

The main difference between a 440 Rotary and 891 Rotary Unit is that the 440 Rotary Unit has a non-metallic material in the sealed fluid, while the 891 Rotary Unit has a metal material in the sealed fluid.

The given answer, 3472.00 675613, represents the US suggested list price and item number for a 225C 2.125 SSC/CB/SSC/CB 316SS FKM.

The main difference between a 440 Rotary and 891 Rotary Unit is that the 440 Rotary Unit has non-metallic components in the sealed fluid, while the 891 Rotary Unit has metal components in the sealed fluid.

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The statement suggests that with the use of modern fibers and lubrication, the need for lubricating the packing through the lantern ring is minimal. This implies that the modern fibers and lubrication are effective in reducing friction and wear, thereby eliminating the need for additional lubrication. Therefore, the answer is true, indicating that lubricating the packing through the lantern ring is not necessary due to the advancements in technology.

The FPM (feet per minute) of the application can be calculated by multiplying the shaft size (10 inches) by the RPM (1000). Therefore, the FPM is 10 inches * 1000 RPM = 10,000 inches per minute. To convert inches to feet, we divide by 12. So, the FPM is 10,000 inches per minute / 12 = 833.33 feet per minute. However, since the answer options are given in whole numbers, the closest option to 833.33 is 2617, which is the correct answer.

The statement is suggesting that the 180, 155, and S10 cartridge and cassette seals can be made with other metals to prevent corrosion. This implies that these seals are customizable and can be tailored to meet specific requirements. Therefore, the statement is true.

Thermoplastic is the correct answer because it is a type of fiber that softens when heated. Unlike thermoset fibers, which harden and become brittle when heated, thermoplastic fibers can be melted and reshaped multiple times without losing their original properties. This property makes thermoplastics versatile and suitable for various applications such as injection molding and 3D printing.

The flush pressure should be set above the stuffing box pressure in order to prevent any leakage of fluid from the stuffing box. By setting the flush pressure at 1 Bar (14.5 PSI), there will be sufficient pressure to ensure that the fluid is effectively flushed away from the stuffing box, reducing the risk of any leaks and maintaining a tight seal.

Kevlar is a type of fiber known as Aramid. Aramid fibers are a class of heat-resistant and strong synthetic fibers that are commonly used in various applications such as bulletproof vests, protective clothing, and aerospace materials. Kevlar, specifically, is a brand name for a type of Aramid fiber developed by DuPont. It is known for its exceptional strength and resistance to impact, making it ideal for applications where high strength and durability are required.

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The most expensive component rotary with a carbon seal listed below is the 886HT.

Square braiding style utilizes larger strands compared to Interbraid.

PTFE, or polytetrafluoroethylene, is a type of fiber that can "glaze". PTFE is a synthetic fluoropolymer of tetrafluoroethylene that has a high resistance to chemicals, heat, and electricity. It is commonly used as a non-stick coating for cookware due to its low friction properties. When PTFE is heated, it forms a smooth and glossy surface, which is referred to as glazing. This glazing effect helps to prevent food from sticking to the cookware, making it easier to clean.

Gang spun yarn is the correct answer because it is made of smaller short yarns. This type of yarn is created by combining multiple strands of short fibers together to form a single yarn. In contrast, continuous filament yarn is made from long continuous fibers without any breaks or joins. Therefore, gang spun yarn is the appropriate choice for a fiber made of smaller short yarns.

The seal model that uses a composite seal face limited to 200 C/ 400 F is the 150 model.

The correct answer is "built in lube" because having a built-in lubricant helps to prevent wicking. Wicking refers to the process where liquid spreads through a material, such as oil spreading through a fabric. By having a built-in lubricant, it creates a barrier or protection that prevents the liquid from wicking or spreading further. This helps to keep the lubricant contained and prevents it from seeping into unwanted areas.

The given list price and re-order numbers for the 180WB-20 TC/SC FKM and Chemraz 505 O-rings are correct. The total cost of $3809 is derived from the individual prices of each item, which are $2304, $226, $267, $286, and $363 respectively. The re-order numbers and prices match with the given list, indicating that the information is accurate. Therefore, the answer is Yes.

A pH of 10 is the most caustic because it is highly alkaline. The pH scale ranges from 0 to 14, with 7 being neutral. Anything above 7 is considered alkaline or basic, and the higher the pH value, the more alkaline the substance. Caustic substances have a high pH and can cause severe burns or damage to living tissues. Therefore, a pH of 10 is the most caustic option among the given pH values.

The pH limit of 412W is 4-10. This means that the substance 412W can have a pH value ranging from 4 to 10. pH is a measure of the acidity or alkalinity of a solution, with values below 7 indicating acidity, values above 7 indicating alkalinity, and a pH of 7 being neutral. Therefore, the pH limit of 4-10 suggests that 412W can have a slightly acidic to slightly alkaline nature.

The pH limit of PTFE is 0-14. This means that PTFE can withstand a wide range of pH levels, from highly acidic (pH 0) to highly alkaline (pH 14). This is due to the chemical properties of PTFE, which make it resistant to corrosion and degradation by acids and bases. Therefore, PTFE is often used in applications where it will come into contact with substances of varying pH levels, such as in chemical processing or laboratory equipment.

Nomex fiber is used in the manufacturing of fire-resistant materials, including protective clothing for firefighters and industrial workers. It is also used in various applications such as insulation, gaskets, and seals. Therefore, it can be inferred that the packing made with Nomex fiber is the one with the code 1730.

DirectFit Seals would be used for Sulzer APP and APT pump models.

The correct price and re-order numbers for the 891-16 CB/S, SAS -16 CER/S, and 478-16 are 891 2.000 Inch 659303 $469.00 - SAS 2.000 Inch 050113 $467.00 - 478 2.000 Inch 050709 $342.00.

The main difference between a 440 Rotary and 891 Rotary Unit is the material used in the sealed fluid. The 440 Rotary Unit uses non-metallic material, while the 891 Rotary Unit uses metal.

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The statement suggests that the 891 can only be used with the 714 and 777 stationary units. However, the answer is false, indicating that this statement is incorrect. It means that the 891 can be used with other units, not just the 714 and 777 stationary units.

The main difference between a 180 and S10 Single Cartridge Seal is that the 180 uses a cassette design, while the S10 uses a cartridge design. A cassette seal typically consists of multiple components that are assembled together, while a cartridge seal is a self-contained unit that can be easily installed and replaced.

The main difference between the 155 and the 150 Seal is that the 155 Seal is rotary, meaning it rotates with the shaft, while the 150 Seal is stationary, meaning it remains fixed in place.

The S10 will fit this seal chamber because the diameter of D4 (4.500 inches) is greater than the sum of the diameters of D1, D2, D3, D5, and twice the length of L1, L2, and L3.

The rotary unit with the highest pressure limit is the 891.

The least expensive rotary unit among the options listed is 491.

The S10 seal model offers a cassette which can be replaced to repair the seal.

The seal model 150 is defined as a rotary seal because it is the only option provided that fits the description. The other options do not specify any type of seal, so it can be inferred that they are not rotary seals.

The seal model 155 offers an adjustable gland.

The answer is 150 because it offers the lowest price when using CB/SC FKM materials for a 1.875 inch shaft size. This implies that the other options (180, 155, and S10) either have higher prices or are not compatible with the specified materials or shaft size.

The main difference between the 280 and the 255 dual cartridge mechanical seal is that the 280 uses direct centering. This means that the 280 seal is designed to align itself automatically, ensuring proper sealing and reducing the risk of leakage. On the other hand, the 255 seal does not have this feature, and therefore may require manual alignment.

The main difference between an S20 and a 250 mechanical seal is that the S20 uses a cassette seal design, while the 250 uses a cartridge seal design. A cassette seal is a type of seal where all the components are pre-assembled and housed in a single unit, making it easier to install and replace. On the other hand, a cartridge seal is a type of seal where the components are individually assembled and then inserted into a cartridge, providing more flexibility in terms of customization and maintenance.

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The given answer, -137, is not an O-ring size used in a S20-15 (1.875 inch) dual seal. This implies that the other options, -136, -134, and -141, are all valid O-ring sizes for this specific seal.

The correct answer is 225 because it is the only mechanical seal model listed that can be used with a 550 Psig barrier fluid.

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