Watts 87SI User Manual
For Commercial and Industrial Applications
ES-87SI
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series 87SI
Stainless Steel Wye-Pattern
Strainers, Threaded and Socket
Weld Connections
Sizes:
Series 87SI Stainless Steel Wye-Pattern Strainers with
Threaded (Model 87SI-T) or Socket Weld (Model 87SI-SW)
connections are used in steam or liquid applications. These
strainers are made overseas. Series 87SI has a machined seat
that allows the screen to be self-aligning to assure a perfect fit.
All sizes come with blow-off connection and an easily
removable stainless steel screen. Blow-off plug is furnished.
1
⁄2" – 3" (15 - 80mm)
Contractor
Approval
Contractor’s P.O. No.
Representative
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87SI
Features
• Cast 316 stainless steel body
• Wye-pattern
• Threaded connections (Model 87SI-T)
• Socket weld connections (Model 87SI-SW)
• Self-aligning stainless steel screen
• Stainless steel retainer cap is tapped and plugged
• PTFE gasket
Models
87SI-T threaded connections
87SI-SW socket weld connections
Pressure (Non-Shock)-Temperature
Maximum Working Pressure:
300psi (20.7 bar) at 400°F (204°C) WSP
720psi (49.6 bar) at 100°F (38°C) WOG
Materials
Body: ASTM A-351 Grade CF8M
316 stainless steel
Retainer Cap: ASTM A-351 Grade CF8M
316 stainless steel
Screen: 304 stainless steel
Cap Gasket: PTFE
*The wetted surface of this product contacted by consumable
water contains less than one quarter of one percent (0.25%) of
lead by weight.
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.
Standard Screens
SIZE OPENINGS STANDARD SCREENS
in. mm in. mm
1⁄2 - 2 15-50 0.032 0.813
21⁄2 - 3 65-80 0.045 1.143
1
⁄32" 304SS perf.
3
⁄64" 304SS perf.
Performance Data
Table shows flow rates (gpm-water) at various pressure
drops (psi) for standard screens.
gpm lpm
500 1900
in. mm
3 80
21⁄2 65
2 50
Inlet
100 380
10 38
Flow (water) - gpm
1 3.8
.5 1.9
0.1 1 10
A
NPT/SW
Flow-coefficient
The flow coefficient (Cv) is the number of gallons per minute
Pressure Drop - psig
11⁄2 40
11⁄4 32
1 25
3
⁄4 20
1
⁄2 15
Strainer Size
of water flowing through a given size restriction at a pressure
drop of one psi. To obtain the Cv factor for a given size
strainer, read capacity at intersection with the one (1) psi
pressure drop.
B
Conversions: For gpm to lpm, multiply by 3.8. For psi
to bars, multiply by .069
Cap
C
NPT
Dimensions — Weights
SIZE DIMENSIONS WEIGHTS
A B C (NPT)
in. mm in. mm in. mm in. mm lbs. kgs.
1⁄2 15 25⁄16 59 19⁄16 40
3⁄4 20 31⁄8 79 21⁄8 54
1 25 35⁄16 84 25⁄8 67
11⁄4 32 41⁄8 105 3 76
11⁄2 40 411⁄16 119 33⁄16 81
2 50 57⁄16 138 313⁄16 97
21⁄2 65 77⁄8 200 55⁄16 135 11⁄4 32 13.0 5.8
3 80 87⁄8 225 515⁄16 151 11⁄4 32 18.0 8.1
Dimensions shown are subject to change. Contact Watts for exact dimensions when required.
A Watts Water Technologies Company
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
ES-87SI 0933 © 2009 Watts
3
⁄8 10 0.5 .2
3
⁄8 10 0.8 .3
1
⁄2 15 1.5 .6
1
⁄2 15 2.0 .9
1
⁄2 15 2.8 1.2
1
⁄2 15 4.3 2.9
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
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