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ACCEPTABLE PIPE SIZE FOR MAXIMUM RECOMMENDED SYSTEM FLOW RATE
PER APSP-7 (6 FT/SEC IN THE BRANCH LINE)
Pipe Size
Flow rate
[mm]
GPM [Liter/Min]
2 ½"
[75]
3"
[90]
The Head loss curves were measured in schedule 40 piping of the size of
the sump port, 24 inches from the sump with the cover installed. Piping
loss was accounted for on these curves.
RECOMMENDED SYSTEM SPECIFICATIONS:
WG1031BHF2, WG1032BHF2, and WG1033BHF2 Suction Outlet Covers
(Sold as per the model numbers on the cover page.) are rated for the Floor and the Wall per chart 2. The Suction Outlet Fitting assemblies
that include the listed covers are considered "Blockable" by the latest APSP-16 standard. In new pools the Suction Outlet Assemblies shall
be installed in multiples. In existing pools with a single "Blockable" Suction Outlet Assembly, the flow rating is the flow rating of the
Suction Outlet Assembly, only when also installed in conjunction with an additional device or system designed and qualified to ASME
112.19.17 to prevent suction entrapment. A Suction Outlet Assembly in a system that does not also include one of the additional devices or
systems shall result in a flow rating of zero. The flow rating for pools with multiple blockable SOFAs in one body of water without isolation
valves: combine all SOFAs minus the flow rate of one. If all are not equal, use the largest flow rate.
The flow ratings of the Suction outlet Assemblies are performance based. These flow limits are designed to prevent suction entrapment.
No field modifications shall be made to a Suction Outlet fitting structure or flow path.
In the event of one suction outlet being blocked, the
remaining suction outlets serving that system shall have a
flow rating capable of the full flow of the pump(s) for the
specific suction system. Skimmers, gutters, and other
outflow systems may not always be operational and
could divert all the pump(s) flow through the Suction
Outlet Fitting Assembly suction system, therefore the
flow capacity of the Skimmers, gutters and other
outflow systems shall not be included when evaluating
an individual suction system flow rating.
Example: In the System shown in Diagram 1, two (2) 12"
Square (WG1032HF2PAK2) suction outlet assemblies
are selected and mounted on the floor. These covers
are individually rated for 515 GPM. For a desired flow of 130 GPM, a minimum pipe size from Chart 1 is selected at 3". At the desired
flow of 130 GPM one cover could be partially blocked and the total suction outlet flow would be below the rated 515 GPM of the
remaining suction outlet. Since there are two outlets flowing in normal operation, and the allowable velocity in the branch piping is
only 3ft/sec with both outlets flowing, the branch piping would require 3" pipe size.
Example: In the System shown in Diagram 2, two (2) 12" Square (WG1032HF2PAK2) suction outlet covers are selected and mounted, on
one the floor and the other on the wall. These covers are individually rated for 515 GPM on the floor and 308 GPM when wall mounted.
For a desired flow of 110 GPM, a minimum pipe size from Chart 1 is selected at 3". At the desired flow of 110 GPM one cover could be
partially blocked and the total suction outlet flow would be below the rated 308 GPM of the remaining suction outlet. Since there are
two outlets flowing in normal operation, and the allowable velocity in the branch piping is only 3ft/sec with both outlets flowing, the
branch piping would require 3" pipe size.
Status: RELEASED Status Date: 23-Nov-21 User: migrator
Pipe Size
[mm]
90
4"
[340]
[100]
138
6"
[522]
[150]
CHART 1
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
The Cover and Sump combination are rated at the
WG1031BHF2
Flow rate
2 1/2" Side Port Floor Mounted
GPM [Liter/Min]
3" Side Port Floor Mounted
238
[900]
2 1/2" Bottom Port Wall Mounted
540
3" Bottom Port Wall Mounted
[2040]
2 1/2" Side Port Wall Mounted
3" Side Port Wall Mounted
WG1032BHF2
3" Side Port Floor Mounted
4" Side Port Floor Mounted
3" Bottom Port Wall Mounted
4" Bottom Port Wall Mounted
WG1033BHF2
3" Side Port Floor Mounted
4" Side Port Floor Mounted
6" Side Port Floor Mounted
3" Bottom Port Wall Mounted
4" Bottom Port Wall Mounted
FIG 1
6" Bottom Port Wall Mounted
following
MAXIMUM ALLOWABLE FLOW RATES
9" x 9"
12" x 12"
18" x 18"
Chart 2
GPM
172
264
224
224
184
224
416
484
308
308
484
656
815
484
688
732
4
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