ES-ET-RA
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%.
Schedule
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.
Model
Number
ET-RA 35
ET-RA 50
ET-RA 85
ET-RA 130
ET-RA 200
ET-RA 300
ET-RA 400
ET-RA 500
ET-RA 600
ET-RA 800
ET-RA-1000
ET-RA-1200
ET-RA-1400
ET-RA-1600
ET-RA-2000
Tank
Volume
Gallons
10
13
23
35
53
79
106
132
158
211
264
317
370
422
528
Tagging Information
Quantity
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
CHARGING
VALVE
E
LIFT RING
SYSTEM
CONNECTION
C
D
C
LIFT
RING
E
2"
B
B
1" NPT
W/PLUG
A
A
B
LIFT
RING
E
C
G
DRAIN
D
F
A
ET-RA 85 through ET-RA 800
ET-RA 35 and ET-RA 50
ET-RA 1000 through ET-RA 2000
DIMENSIONS - WEIGHT
Dimensions
D
in. mm
Model
Number
A (DN)
in.
mm
B
in. mm
C
ET-RA 35
ET-RA 50
12
14
305
356
25
25
635
635
34
34
⁄
⁄
19
19
–
–
–
–
ET-RA 85
ET-RA 130
ET-RA 200
ET-RA 300
ET-RA 400
ET-RA 500
ET-RA 600
ET-RA 800
16
20
24
24
30
30
30
36
400
508
610
610
750
750
750
900
37
37
43
55
49
57
65
63
940
940
1092
1397
1245
1448
1651
1600
1
1
11⁄2
11⁄2
11⁄2
11⁄2
11⁄2
11⁄2
25
25
38
38
38
38
38
38
12
⁄
⁄
1⁄2
3⁄4
3⁄4
3⁄4
3⁄4
3⁄4
13
13
13
19
19
19
19
19
ET-RA 1000
ET-RA 1200
ET-RA 1400
ET-RA 1600
ET-RA 2000
36 900
36 900
36 900
48 1200
48 1200
74
86
99
72
85
1880
2184
2515
1829
2159
11⁄2
11⁄2
11⁄2
11⁄2
11⁄2
38
38
38
38
38
34
19
19
19
19
19
in. mm
12
⁄
⁄
3⁄4
3⁄4
3⁄4
34
Note: Tanks are factory pre-charged at 12 psi and field adjustable.
E
.302"
-32NC
.302"
-32NC
.302"
-32NC
F
in. mm
in.
G
mm
Weight*
lbs. kgs.
–
–
–
–
–
–
–
–
40
50
18
23
12
16
20
20
24
24
24
30
305
406
508
508
610
610
610
762
51 ⁄2
51 ⁄2
5 1 ⁄4
5 1 ⁄4
51 ⁄4
51 ⁄4
51 ⁄4
51 ⁄4
140
140
133
133
133
133
133
133
90
125
210
225
300
335
360
475
41
57
95
102
136
152
163
215
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
710
720
875
1100
1280
322
327
397
499
581
(*approximate)
Note: On models ET-RA 85 thru ET-RA 800 both top and bottom connections (C and D) access the bladder.
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
© Watts Regulator Co., 1999
Printed in U.S.A.