English Instructor Manual (PDF) - Metric Version - National ...

Key Points: Discuss the various aspects of surge/balancing tanks. These include:
Surge/balancing tanks function to accommodate overfl ow water in a system that uses
overfl ow gutters. Since the water levels in these pools comes completely to the top,
when water is displaced, it has no where to go. These tanks hold the overfl ow water
until the system can allow it to return to the pool.
Activity: Show the participants a coffee cup and saucer. Fill the cup with water up to the top
without letting it overfl ow. Drop several marbles into the cup and observe the displacement of
water over the sides of the cup and into the saucer. Now carefully remove the marbles from the
water with a spoon or fork. Notice that the water level in the cup is lower than the original level.
Now carefully take the saucer and pour the water back into the cup. The water should be back to
its original level.
The cup represents the pool. The saucer represents a surge or balancing take. In a pool, when
water is displaced, it is stored in a tank, much like the water in the saucer. When the pool is once
again inactive, mechanisms in the circulation system allow the pool water to return back to the
original level, just like the coffee cup after the water had been replaced.
Key Points: Discuss the various aspects of a hair and lint strainer. These include:
Hair and lint strainers screen the pump from large debris that could damage the
impeller.
Hair and lint strainers should be checked regularly. Failing to check them regularly
could prevent suffi cient water fl ow through the pump, causing reduced circulation,
overheating, and damage.
Key Points: Discuss the various aspects of a circulation pump and motor. These include:
The pump and motor provide force that circulates water throughout the system. It is
measured in litres per minute (lpm).
The most important part of the pump is the impeller, which creates the suction and
pressure to move the water. The impeller is to the circulation system what the heart is to
the human body.
The placement of the pump and motor in relation to the fi lters determines the type of
circulation system the pool uses. If the pump is located before the filter(s), the system
is a pressure system. If the pump is located after the fi lter(s), the system is a vacuum
system.
Key Points: Discuss the various aspects of meters and gauges. These include:
Meters and gauges are designed to monitor system performance
They are used to indicate suction (vacuum), pressure, water fl ow (fl ow meters),
temperature, chemical levels, and water levels
Key Points: Discuss the various aspects of valves. These include:
Valves regulate the fl ow of water through the circulation system
Types of valves include gate valves, ball valves, butterfl y, and multi-port valves
© 2014 National Swimming Pool Foundation® Page 73