Chapter 17 - Filters and Dryers

How can you determine if the cartridge filter is full?

• Refer to the indicator on the filter
• Look for a restricted process flow
• A cartridge filter is self-cleaning and will not get full
• The differential pressure across the cartridge decreases

What is the purpose of a vacuum filtration system?

• To remove the filtering medium from the feed stream
• To trap contaminants on the surface of the filter medium
• To increase particle size
• To decrease the flow rate

What percent of particles can be removed with a nominal rating on a filter?

• 99.9 percent
• 85 percent
• 58 percent
• 50 percent

What is the relationship between the size of particles to be removed and the type of filter to be used?

• Inverse relationship
• Exponential relationship
• Direct relationship
• No relationship

What is the concept of differential pressure in a filter?

• The pressure difference between the inlet and outlet of the filter
• The pressure difference between two different filters
• The pressure difference between the filter and the dryer
• The pressure difference between the filter and the pump

Which of the following factors should be considered when selecting the appropriate filter?

• Type of material being filtered
• Size of particles to be removed
• Degree of filtering required
• All of the above

What is the importance of cost in filter selection?

• No importance
• Moderate importance
• Low importance
• High importance

What is the majority of an approximate particle size removed with a nominal rating?

• 50 to 60 percent
• 70 to 80 percent
• 85 to 95 percent
• 99 to 100 percent

What type of filter uses a strainer or cartridge to remove particles from the feed stream?

• Mechanical
• Vacuum
• Gravity
• Suction

What is the purpose of a strainer or cartridge in a filter?

• To increase differential pressure
• To add contaminants to the feed stream
• To decrease flow rate
• To remove particles from the feed stream