Watts ET-RA User Manual
Series et-ra, Features, Construction
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 water-
logging problems. ET-RA expansion tanks reduce tank
sizes up to 80%.
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 ET-
RA ____ gallon ____ " diameter x ____" (high) pre-charged
steel expansion tank with a heavy duty butyl rubber blad-
der. 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 sys-
tem requirements. The tank must be constructed in accor-
dance with Section VIII of the ASME Boiler and Pressure
Vessel Code.
For Heating and Cooling Systems
Job Name
Contractor
Job Location
Approval
Engineer
Contractor’s P.O. No.
Approval
Representative
ES-ET-RA
Watts product specifications in U.S. customary units and metric are ap-
proximate 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 with-
out 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
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
Schedule