Watts ET-RA User Manual
For Heating and Cooling Systems
Job Name Contractor
Job Location Approval
Engineer Contractor’s P.O. No.
Approval Representative
Series ET-RA
ASME
Pressurized Expansion Tanks for
Heating and Cooling Systems
Models ET-RA 35 to ET-RA 2000
Watts Model ET-RA Tanks are ASME removable bladder
type pre-charged expansion tanks. They are designed to
absorb the expansion forces and control the pressure in
heating and cooling systems. The water is contained in the
heavy duty bladder preventing tank corrosion and waterlogging problems. ET-RA expansion tanks reduce tank
sizes up to 80%.
ES-ET-RA
FEATURES
• ASME Section VIII Code Construction
• Removable Butyl Bladder
• Precharged to 12 psi (Field Adjustable)
CONSTRUCTION
Shell: Carbon steel
Bladder: Heavy duty butyl
Prime Painted Exterior
PRESSURE - TEMPERATURE
Maximum Design Pressure: 125 psig* (8.5 bars)
Maximum Design Temperature: 240°F (115°C)
Precharged to 12 psi (83 kPa)
*200 & 250 psig available.
SPECIFICATIONS
Furnish and install as shown on plans a Watts Model ETRA ____ gallon ____ " diameter x ____" (high) pre-charged
steel expansion tank with a heavy duty butyl rubber bladder. The tank shall have NPT system connections and a
.302" - 32 charging valve connection (standard tire valve)
to facilitate the on-site charging of the tank to meet system requirements. The tank must be constructed in accordance with Section VIII of the ASME Boiler and Pressure
Vessel Code.
Schedule
Tank
Model Volume
Number Gallons Tagging Information Quantity
ET-RA 35 10
ET-RA 50 13
ET-RA 85 23
ET-RA 130 35
ET-RA 200 53
ET-RA 300 79
ET-RA 400 106
ET-RA 500 132
ET-RA 600 158
ET-RA 800 211
ET-RA-1000 264
ET-RA-1200 317
ET-RA-1400 370
ET-RA-1600 422
ET-RA-2000 528
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.
USA: 815 Chestnut Street, North Andover, MA 01845-6098
Canada: 5435 North Service Road, Burlington, Ontario L7L 5H7
ASME EXPANSION TANKS - Pressurized
C
B
A
E
ET-RA 35 and ET-RA 50
D
E
B
G
A
F
ET-RA 85 through ET-RA 800
LIFT
RING
C
LIFT RING
SYSTEM
CONNECTION
C
2"
1" NPT
W/PLUG
DRAIN
D
ET-RA 1000 through ET-RA 2000
CHARGING
VALVE
E
B
LIFT
RING
A
DIMENSIONS - WEIGHT
Model A (DN) B C D E F G Weight*
Number in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
ET-RA 35 12 305 25 635
ET-RA 50 14 356 25 635
3
⁄4 19 – – .302" – – – – 40 18
3
⁄4 19 – – -32NC – – – – 50 23
ET-RA 85 16 400 37 940 1 25
ET-RA 130 20 508 37 940 1 25
ET-RA 200 24 610 43 1092 1
ET-RA 300 24 610 55 1397 1
ET-RA 400 30 750 49 1245 11⁄2 38
ET-RA 500 30 750 57 1448 1
ET-RA 600 30 750 65 1651 1
1
⁄2 38
1
⁄2 38
1
⁄2 38
1
⁄2 38
ET-RA 800 36 900 63 1600 11⁄2 38
ET-RA 1000 36 900 74 1880 11⁄2 38
ET-RA 1200 36 900 86 2184 1
ET-RA 1400 36 900 99 2515 1
ET-RA 1600 48 1200 72 1829 11⁄2 38
ET-RA 2000 48 1200 85 2159 1
1
⁄2 38
1
⁄2 38
1
⁄2 38
Note: Tanks are factory pre-charged at 12 psi and field adjustable. (*approximate)
Note: On models ET-RA 85 thru ET-RA 800 both top and bottom connections (C and D) access the bladder.
Dimensions
1
⁄2 13 12 305 51⁄2 140 90 41
1
⁄2 13 16 406 51⁄2 140 125 57
1
⁄2 13 .302" 20 508 51⁄4 133 210 95
3
⁄4 19 -32NC 20 508 51⁄4 133 225 102
3
⁄4 19 24 610 51⁄4 133 300 136
3
⁄4 19 24 610 51⁄4 133 335 152
3
⁄4 19 24 610 51⁄4 133 360 163
3
⁄4 19 30 762 51⁄4 133 475 215
3
⁄4 19 – – – – 710 322
3
⁄4 19 – – – – 720 327
3
⁄4 19 .302" – – – – 875 397
3
⁄4 19 -32NC – – – – 1100 499
3
⁄4 19 – – – – 1280 581
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscda.com
ES-ET-RA 9928-0 Printed in U.S.A.
© Watts Regulator Co., 1999
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