UNDERSTANDING - 8 - CLEANING_Slug Flow

Question Title

* 1. Enter your first and last name

Question Title

* 2. According to the "one slug theory," _____________.

All pipe surfaces will be assured contact with cleaning solution only if one slug is moved through the entire pipeline without breaking during each air injection close/open cycle.

All pipe surfaces will be assured contact with cleaning solution if only one slug is used during each air injection close/open cycle.

All pipe surfaces will be assured cleaning if one slug of air is used each air injection close/open cycle.

One slug is per air injection close open cycle is never enough to properly clean pipe surfaces.

Question Title

* 3. The only way that all pipe surfaces can into contact with cleaning solutions is if one slug moves through the entire pipeline without breaking.

True

False

Question Title

* 4. Select all that apply. The following statements are true of slug flow:

Slug flow is used to clean large diameter milk-lines in milking machines.

Slug flow increases the physical or "scrubbing" action of cleaning solutions.

Slug flow reduces the water volume required to clean milk-lines.

Slug flow increases the water volume required to clean milk-lines.

Slug flow is results in decreased physical or "scrubbing" action of cleaning solutions

Question Title

* 5. Select all that apply. The following statements are true of the slug:

The slug is cylindrical scrub brush the same diameter of the pipeline that is inserted to provide extra physical or "scrubbing" cleaning action.

The slug is pushed around the milk-line during the "closed" or "off" phase of the air injection cycle.

The slug is formed during the "open" or "on" phase of the air injection cycle.

The slug is pushed around the milk-line during the "open" or "on" phase of the air injection cycle.

The slug is formed during the "closed" or "off" phase of the air injection cycle.

Question Title

* 6. When the slug is building the wash valve is closed, the milk-line and receiver are under partial pressure, and cleaning solutions drawn from the wash sink collect at the closed wash valve to build the slug.

True

False

Question Title

* 7. When pushing a slug of water along the pipeline, controlling the amount of air and controlling the amount of time over which that air is admitted to the pipeline is NOT important.

True

False

Question Title

* 8. Select all that apply. The following statements are true of the air injector:

The air injector is an automatically controlled valve which controls the admission of air and cleaning solution into the milking system.

The air injector may be mounted on the wash manifold or directly on the milk-line.

There are different models of air injectors in the market.

When the air injector is closed, cleaning solution is drawn into the system, and a slug of water is built in the pipeline.

When the air injector opens, it allows air to get into the pipeline, which will push the slug of water through the pipeline.

The air injector is a valve that must be controlled manually through the cleaning process.

When the air injector is open, cleaning solution is drawn into the system, and slug of water is built in the pipeline.

Correctly altering the air injector timing is a simple procedure that anyone can perform.

Question Title

* 9. Select all that apply. The performance of the slug is influenced by the following factors:

Distance that slug travels intact along the pipeline.

The velocity of the slug.

The length of the slug.

Restrictions to water flow in the milking units.

Water volume provided to the cleaning cycle.

Question Title

* 10. Select all options that match the slug flow characteristic with the factors that determine it.

Distance the slug travels intact along the pipeline: Determined by the period of time that the air injector remains open allowing air into the system.

Velocity of the slug: Determined by the air admission rate through the air injector.

Length of the slug: Determined by the period of time that the air injector remains closed.

Question Title

* 11. Select all that match the slug flow characteristic with its optimal formation.

Distance the slug travels intact along the pipeline: The air injector "open" or "on" time should be adjusted so that the slug formed at the beginning of the line has enough time to travel completely around the milk-line circuit.

Velocity of the slug: The velocity for optimal cleaning action is 7-10 meters/sec (23-33 feet/sec)

Length of the slug: The air injector "closed" or "off" time should be adjusted so that the size of the slug reaching the receiver is sufficient to wash the receiver.

Question Title

* 12. Select all that apply. Ahead and behind the liquid slug, the pipe is partially filled by a liquid layer that moves in the same direction as the slug but at a lower velocity. As the slug travels, it picks up liquid at its face and loses liquid at its tail. The rate of cleaning solution pickup is proportional to the fill depth in the pipe ahead of the slug. The following statements relating fill depth to slug length are true:

If fill depths are greater than 20%, as usually occurs in the first 10-20 meters (30-60 feet) of pipeline, the slug will decrease in length as it travels.

If fill depths are less than 20%, as usually occurs in all pipeline past the first 10-20 meters (30-60 feet), the slug will increase in length as it travels.

If fill depths are less than 20%, as usually occurs in all pipeline past the first 10-20 meters (30-60 feet), the slug will decrease in length as it travels.

If fill depths are greater than 20%, as usually occurs in the first 10-20 meters (30-60 feet) of pipeline, the slug will increase in length as it travels.

Question Title

* 13. Select all that apply. Water flow restrictors perform the following duties:

Take accurate bacterial concentration measurements.

Completely stop water flow in emergencies.

Match water intake to milk pump capacity.

Change water flow distribution to units.

Question Title

* 14. The air injector should be turned off before the slug enters the receiver.

True

False

Question Title

* 15. Select all that apply. Common causes of cleaning failure include:

The velocity of the slug being 7-10 meters/sec.

The breakup of the slug in the milk-line due to the air injector not remaining "open" or "on" long enough.

The breakup of the slug in the milk-line due to the slug length being insufficient.

Question Title

* 16. The slug efficiency can be assessed through vacuum recordings.

True

False