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Skimmer Layout and Suction Line Sizing
NOTE: In any installation, there should be at least two main
drains at least three feet apart in addition to any skimmers
installed. A pool may use more than two, but should never have
less than two main drains.
NOTICE: Installation must comply with all applicable codes,
including NSF Standard 50 (if required). Equalizer lines may be
required on public pool or commercial pool installations.
1.
Use one skimmer per 500 square feet of pool
surface area. Suction line sizes are based on a
water velocity of less than seven feet per second.
Since building codes vary, check your local building
code before installing pool and skimmers.
2.
Suction line sizes for each section of piping must
allow for the total number of skimmers feeding that
section of the line. Suction line sizing in Chart I
allows for this.
3.
See Figures 5 and 7, Pages 2 and 4, for piping
layout. See Table I, Page 4, for suction pipe sizing.
4.
For good hydraulic balance, divide skimmers as
equally as possible between the main branches of
the piping layout.
5.
For long pipe runs (in which friction can reduce flow
and pressure), refer to your friction/flow chart for
proper pipe sizes.
6.
When planning location of skimmers on one- and
two-skimmer outdoor pools, locate skimmers so that
the prevailing wind blows into the skimmers.
INSTALLATION
Concrete: See Figure 8 for basic dimensions.
NOTICE: Skimmer MUST be surrounded by at least 4" of structural
concrete in a monolithic pour, using a cold joint as shown in
installation drawings.
Line Connections and Testing: Connect pump inlet line to rear port
in bottom manifold (Figure 8). Skimmer is ABS plastic; manifold
connections are 1-1/2 or 2" threaded or 1-1/2" slip. For threaded
connections, do not use pipe dope; to seal joint use RTV Silastic
#732* (preferred), Teflon
®
tape, or Plasto-Joint Stik
connections, apply PVC primer to PVC pipe only. Then apply ABS
to PVC solvent cement to both pipe and slip connections. Consult
dealer for correct solvent cement for pipe used. Assemble joint per
cement manufacturer's instructions. Allow at least 3 hours before
pressure testing.
Plastic cements and primers can be flammable, poisonous, or both.
Closely follow cement manufacturer's instructions when using
plastic cement.
In residential installations where equalizers are not required and
where the main drain lines do not connect to the skimmer equalizer
port, low water levels in the pool, spa, or hot tub or clogged skimmer
baskets may damage the pump due to loss of prime (if skimmer
sucks air) or cavitation (if skimmer clogs). Air pulled in by
skimmer(s) can be trapped in filter tanks, which may be a safety
hazard. If skimmer regularly vortexes or sucks air, raise water level
or contact your pool service representative for advice.
18"
adjustment of frame
to accommodate for
misaligned pump
pump
suction
®.
For slip
equalizer fitting
that conforms to
Note: To prevent
cover must fit
Figure 8: Admiral S-20 Skimmer Installation Illustration
CONCRETE
Top View
1" Vertical
suction
To
21"
Min.
28"
2"
Equalizer
Alternate Line
from Main Drain
Section View
Install an
ANSI ASME
A112.19.8.
entrapment,
tightly onto
Front View
fitting.
Admiral
™
S-20 Automatic Skimmer Installation Guide
18"
8¼"
Ref.
27"
27"
12" Ref.
7½"
1"
W.L.
2"
Min.
W.L.
2"
5
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