Solar Water Heaters > Blue 200L Vertical Potable Water Expansion Tank with Legs [ExpTank-200VL-PW]
Search Store
Item Pictures
200L potable water expansion tank 200L potable water expansion tank

Item Description

Duda Solar Expansion Tanks

Red / Solar Expansion Tanks

Expansion tanks are essential for solar water heater systems. The Red expansion tank is used for relieving pressure build-up in the closed loop system. This helps keep the pressure consistent and relieve pressure from the piping as the working fluid increases in temperature. Should the solar system go into overheat mode and shut down the circulation pump, the expansion tank is essential for preventing the pressure valve from blowing out the working fluid. The Red Duda Solar expansion tank is fitted with a special high temperature EPDM membrane made in Italy which can withstand the high temperatures of the solar systems.

The size of the expansion tank needed depends on the total amount of fluid used in the closed loop (maximum possible volume). Some data regarding common fluid volumes in the solar systems is in the chart below.

Typical Solar System Volumes to Compensate For
Collector Manifold Volumes
15 Tube Collector
0.9 Liters
20 Tube Collector
1.2 Liters
25 Tube Collector
1.5 Liters
30 Tube Collector
1.7 Liters
CSST Volumes
1/2" Stainless Tubing
3.45 Liters/100 Feet
3/4" Stainless Tubing
6.13 Liters/100 Feet
1" Stainless Tubing
9.60 Liters/100 Feet
Water Tank Coil Volumes
20m/66' 1/2" Coil
1.4 Liters
25m/82' 1/2" Coil
1.8 Liters
30m/99' 1/2" Coil
2.1 Liters
35m/115' 1/2" Coil
2.5 Liters
40m/131' 1/2" Coil
2.9 Liters
45m/148' 3/4 " Coil
8.9 Liters
50m/164' 3/4 " Coil
9.9 Liters

As an example, a standard 300 liter solar system has a 30 tube collector, 100 feet of 1/2" stainless steel tubing and a 300 liter tank (25m coil) for a total of ~7 liters of fluid volume, requiring at least an 8 Liter expansion tank.

 

Blue / Water Expansion Tanks

Blue Duda Solar Expansion tanks are constructed with a food grade EPDM diaphragm for potable water applications. These should be used for relieving pressure from building up in the domestic water tank as it heats from the solar loop. Use of an expansion tank helps regulate the pressure so that it does not get too high in the tank and cause water loss due to the T/P valve opening when the pressure of the water exceeds the limit.

The difference in water density from cold (4°C) to near boiling (99°C) is approximately 4%. For maximum expansion capabilities, your expansion tank capacity should be 4% the size of your water heater. ie: A 300 liter tank should have a 12L expansion tank.

Expansion tanks are also very useful in well pump applications. In order to avoid the pump turning off and on constantly, an expansion tank of adequate size should be placed in line to receive a hold water. When the tap is opened, the expansion tank will push out water using the pressure created by the air inside of it. The well pump will only need to turn back on when most of the expansion tank is empty and the water pressure has dropped below the minimum pressure threshold.

 

Tank Specifications

Duda Solar expansion tanks come pre-charged with some air from the manufacturer. This charge can be increased or decreased with a typical inflation valve. This air charge should match the pressure at which you want the working fluid to begin entering into the expansion tank (usually just above the normal working pressure). As fluid pressure increases, some fluid enters into the tank, pushing the air back and thus rising the pressure of the air. Eventually, the tank will become nearly full with fluid or reach the maximum working pressure for both the fluid/air. For system and tank protection, a safety valve must be installed in addition to the expansion tank.

Note that the expansion tank will have an air charge in it which determines when the expansion tank should start relieving pressure. For this reason, not all of the tank's capacity will be available as some of it will be filled with air. For best results, choose a size 1 model larger than what you need.

General Duda Solar Expansion Tank Specifications
Model
Red
Blue
Maximum Working Temperature
130°C (266°F)
99°C (210°F)
Maximum Working Pressure
10 Bar (145 psi)
Tank Material
Deep Drawing Cold Steel
Membrane Material
High Temperature EPDM (Made in Italy)
EPDM
Membrane Certifications
NSF51, Hygienic certified, Approved by EU and USA Institutions
Flange & Connections Material
ST37, Galvanized Carbon Steel

 

Expansion Tank Size Specifications

Model
Type
Capacity
Diameter
Length
Connection
Pre-Charge Pressure
Color/Application
Shape
Liters
Gallons
mm
inches
mm
inches
bar
psi
ExpTank-8V-S
Red / Solar
Vertical
8
2.1
200
7.9
330
13.0
1/2" NPT
2
29
ExpTank-8V-PW
Blue / Potable Water
3/4" NPT
ExpTank-12V-S
Red / Solar
12
3.2
240
9.4
310
12.2
1/2" NPT
ExpTank-12V-PW
Blue / Potable Water
3/4" NPT
ExpTank-19V-S
Red / Solar
19
5.0
300
11.8
370
14.6
1/2" NPT
ExpTank-19V-PW
Blue / Potable Water
3/4" NPT
ExpTank-24V-S
Red / Solar
24
6.3
430
16.9
ExpTank-24V-PW
Blue / Potable Water
ExpTank-36V-S
Red / Solar
36
9.5
350
13.8
325
12.8
ExpTank-36V-PW
Blue / Potable Water
ExpTank-50VL-S
Red / Solar
Vertical with Legs
50
13.2
760
29.9
1" NPT
ExpTank-50VL-PW
Blue / Potable Water
ExpTank-100VL-S
Red / Solar
100
26.4
460
18.1
990
39.0
4
58
ExpTank-100VL-PW
Blue / Potable Water
ExpTank-200VL-PW
200
52.8
600
23.6
1120
44.1
1-1/4" BSP
ExpTank-300VL-PW
300
79.3
640
25.2
1250
49.2
ExpTank-500VL-PW
500
132.1
750
29.5
1490
58.7

 

 

 

200L potable water expansion tank
Blue 200L Vertical Potable Water Expansion Tank with Legs
• 200L Expansion Capacity, 1-1/4" BSP Connection
• Working Temperature: 99°C/210°F, Max Pressure: 10 Bar (145 psi)
• Relieves pressure for water heater tanks & well systems
QTY
$Ea.
1+
445
4 in stock
Contact for Freight
Average Rating: Not yet rated

Write a review

Content on this page requires a newer version of Adobe Flash Player.

Get Adobe Flash player

Customer Reviews:

Home | View Cart | Check Out | Forums | Contact Us | Affiliate Program
Heat Exchangers | Pumps | Filters | All Chemicals | Fluoroelastomer Hose (Like Viton Hose)
Other Chemicals | Solenoid Valves | Stainless Steel Fittings | Stainless Steel Ball Valves | Check Valves
Cone Tanks | Solar Water Heaters | Propane Conversion Kits | LED Lighting
Magnetic Stirrers

Drolex Web Design | © 2008 DudaDiesel.com | Biodiesel & Alternative Energy Supplies