Code
The flow rate for the SKIMMERS shall comply with manufacturer data plates or NSF/ANSI 50 including Annex K.
Annex
SKIMMERS should provide for a flow-through rate of 30 gallons per minute (114 L/min), or 3.75 gallons per minute (14 L/min) per linear inch (2.5 cm) of weir, whichever is greater. The AHJ may approve alternate flow-through rates so long as the SKIMMERS are NSF or equivalent listed and manufacturer’s design specifications are not exceeded.
Flotation Test Procedure
Materials Needed:
* Yellow wooden stars (55 -110 minimum depending on the pool’s surface area)
* Video camera
* Tripod
Conditions Prior to Test:
* TURNOVER time and recirculation flow rate are operated as normal for the POOL
* INLETS and outlets are positioned as normal for the POOL
* SKIMMERS or gutter system is not flooded
* If using SKIMMERS, make sure that the weirs are present
* Water level is at the appropriate height above the weir/gutter (about &fac14; inch or 6.4 mm)
* Set up video camera to record
Test 1: Circulation
1. Determine how many stars are necessary by using the following:
o POOL surface area < 2,500 square feet (232 m2), use a minimum of 55 stars;
o POOL surface area > 2,500 square feet (232 m2). use a minimum of 110 stars.
2. Randomly toss the stars into the POOL. Try to toss the stars so that there is an even distribution throughout the surface of the POOL.
3. Record and observe the stars as they travel.
4. Record the motion of the stars in each area of the POOL (e.g., clockwise, counter-clockwise, no movement) and any other observations.
5. Passing criteria may vary, but suggestions include 90% removal within one hour.
Test 2: Skimmer/Gutter Draw
1. Stand behind one of the SKIMMERS or the gutter and drop a star into the water at arm’s length distance (about 2 feet (61 cm)) in front of it.
2. Record how long it takes for the star to enter the SKIMMER or gutter. Then repeat this process at the same location three times.