Watts 97FB-FSFE User Manual
For Fire Protection Applications
ES-97FB
Job Name
Job Location
Engineer
Approval
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Series 97FB-FSFE
UL/FM Fire Service Strainers
Sizes: 3" – 10" (80 – 250mm)
Series 97FB-FSFE (flanged) UL/FM Fire Service Strainers are
used in water spray fire protection systems to protect against
clogging that can be caused by particles fouling the discharge
opening of the sprinkler heads. Strainers for fire systems are
designed to trap foreign material
This type of strainer is usually installed upstream of most
of the devices in the system including the meters, backflow
preventers (or detector check valves) and flow alarms, in order
to protect these devices from damage caused by dirt
and debris.
Features
• Fabricated steel, epoxy lined and coated
body and cover
• With cleanout port
• Large solids trap to minimize screen blockage
• 304 Stainless Steel strainer element
Pressure – Temperature
Suitable for supply pressure up to 175psi (12.1 bar)
Water temperature up to 140˚F (60˚C)
Materials
Body and cover: corrosion resistant fusion-bonded epoxy
lined and coated steel.
Screen: 304 Stainless Steel, .25 diameter perforation
Clean-Out Plug: Brass or Bronze
Flanges: AWWA Class “D”
1
⁄4" diameter or larger.
Contractor
Approval
Contractor’s P.O. No.
Representative
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97FB-FSFE
Approvals
Listed 321 Class 5551
Specifications
The strainer shall be designed to permit removal of the strainer
screen for replacement and repair without removing the body
from the line. A flush outlet shall be provided with each strainer.
The strainer screen shall withstand 125psi (8.6 bar) when
plugged. Friction loss shall not exceed 10psi (69 kPa) when
tested with foreign materials (gravel) equal to 2
of filled pipe trapped in the strainer. Open screen area shall be
at least 6 times greater than the nominal pipe size open area.
Friction loss shall not exceed 3psi (21 kPa) at rated flow when
tested with clean strainer screen and clean water. The strainer
shall be a Watts Series 97FB-FSFE.
1
⁄2' (762mm)
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For
precise measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product
design, construction, specifications, or materials without prior notice and without incurring any obligation to make such
changes and modifications on Watts products previously or subsequently sold.
Dimensions – Weights
Top View Dimensions
Lid
Size Diameter (D)
D
in. mm in. mm
3 80 13
4 100 13
6 150 19 483
8 200 25 635
10 250 27
A
NOM RATED FLOW SIZE (DN) DIMENSIONS WEIGHT STD STD PERF DIA
*
GPM LPM in. mm in. mm in. mm in. mm lb. kg in. mm
325 1235 3 80 14
600 2280 4 100 21 533 205⁄8 524 105⁄8 270 120 541⁄4 6.4
1350 5130 6 150 26
2100 7980 8 200 31
3600 13680 10 250 30 762 29
A B C
1
⁄8 359 205⁄8 524 10 254 70 321⁄4 6.4
7
⁄8 683 223⁄8 568 111⁄4 286 232 1051⁄4 6.4
1
⁄4 794 251⁄16 637 13 330 560 2541⁄4 6.4
5
⁄16 744 141⁄2 368 570 2561⁄4 6.4
1
/2 343
1
/2 343
1
/2 699
C
Flow vs. Pressure Drop
psi
kPa
35
5
28
4
21
3
14
2
Pressure DropPressure DropPressure DropPressure DropPressure Drop
7
1
0
0
0 100 200 300 400 500 600 gpm
0 380 760 1140 1520 1900 2280 lpm
psi
kPa
35
5
28
4
21
3
14
2
7
1
0
0
0 100 200 300 400 500 600 700 800 gpm
0 380 760 1140 1520 1900 2280 2660 3040 lpm
psi
kPa
35
5
28
4
21
B
3
14
2
7
1
0
0
0 250 500 750 1000 1250 1500 gpm
0 950 1900 2850 3800 4750 5700 lpm
psi
kPa
35
5
28
4
21
3
14
2
7
1
0
0
0 500 1000 1500 2000 2500 3000 gpm
0 1900 3800 5700 7600 9500 11400 lpm
psi
kPa
35
5
28
4
21
3
14
2
7
1
0
0
0 1000 2000 3000 4000 gpm
0 3800 7600 11400 15200 lpm
3" (80mm)
*
Flow Rate
4" (100mm)
Flow Rate
6" (150mm)
Flow Rate
8" (200mm)
Flow Rate
10" (250mm)
Flow Rate
*
*
*
*
A Watts Water Technologies Company
USA: No. Andover, MA • Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ON • Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
ES-97FB 1123 © 2011 Watts
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