Expansion Vessels. 16 Product overview 2013 We reserve the right to change designs and technical specifications of our products.

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1 . Expansion Vessels Flamco produces a comprehensive range of diaphragm expansion vessels. Both the steel vessel and the diaphragm are of the highest quality. They are compliant with all prevailing European standards and carry the CE mark of conformity. Flamco vessels are available for both potable, chilled and heated water systems in sizes ranging from 2 litres up to 8,000 litres. 6 Product overview 203 We reserve the right to change designs and technical specifications of our products.

2 Expansion Vessels Product overview 203 We reserve the right to change designs and technical specifications of our products. 7

3 Expansion Vessels Overview Fixed Diaphragm Removable bladder Diaphragm Removable Flexcon Intermediate bladder Vessels Contra-Flex litres. Max. operating pressure; 3 bar: 8-35 litres, 6 bar: litres. Flexcon M 80-8,000 litres. Max. operating pressure: 6/0/6/25 bar. High-quality industrial tank. Larger dimensions available on request. Flexcon VSV For central heating systems in which the inlet temperature exceeds 90 C or the return temperature exceeds 70 C. Max. operating temperature: 60 C. Operating pressure: 6/0 bar. Flexcon C 2 -,000 litres. Max. operating pressure: 3 bar For small installations. Flexcon PRO 200 -,000 litres. Max. operating pressure: 6 bar. Flexcon V-B For central heating systems in which the inlet temperature exceeds 90 C or the return temperature exceeds 70 C. Max. operating temp.: 20/60 C. Max. operating pressure: 6/0 bar. Flexcon 0 -,000 litres. Max. operating pressure: 6 bar: 0 -,000 litres, 0 bar: 0 -,000 litres. For systems large and small. Flexcon TOP 8-80 litres. Max. operating pressure: 6 bar. High-pressure alternative for smaller systems. Cubex R 2-8 litres. Max. operating pressure: 3 bar. Space-saving alternative for smaller systems. Flexcon Solar 8 -,000 litres. Max. operating pressure: 8 bar: 8-80 litre, 0 bar: 0 -,000 litres. For solar systems. Flexcon P 8-50 litres. Max. operating pressure: 3 bar. Space-saving alternative for smaller systems. 8 Product overview 203 We reserve the right to change designs and technical specifications of our products.

4 Expansion Vessels Flexcon P: Space Saving Expansion Vessels of Superior Quality Butyl rubber diaphragm: Excellent pre-charge gas pressure maintenance. Pre-formed convex diaphragm with flexible 'rolling' action prevents the diaphragm from stretching. The proven Flamco clamp ring construction permits the use of a butyl rubber diaphragm that is approximately half the size of a full diaphragm in a comparable vessel. This ensures reduced permeability and a long service life for the expansion vessel. Quick, easy and space saving installation using the wall mounting bracket. 5 year warranty. FLEXCON P 8 FLEXCON P 25 FLEXCON P 35 FLEXCON P 50 Product overview 203 We reserve the right to change designs and technical specifications of our products. 9

5 Vessel Calculation for Central Heating Systems Calculation for a Flexcon expansion vessel for central heating systems with fixed or removable diaphragm Basic parameters for the calculation of a Flexcon expansion vessel. Initial pressure of the Flexcon expansion vessel This is the pressure measured at the nitrogen filler valve at ambient temperature and atmospheric pressure. The pressure is equivalent to the static height, rounded up to a factor of 0.5 bar. Vessel volume This is the total capacity of the Flexcon expansion vessel. Vessel efficiency This is the maximum amount of expansion water that can be contained in the vessel. Static height This is the height of the system from the Flexcon expansion vessel connection to the highest point of the system measured in water column metres, ( wcm 0. bar). Maximum working pressure This is the maximum permissible system pressure at the Flexcon expansion vessel. The maximum working pressure may not exceed the maximum value indicated on the expansion vessel. Output This is the ratio between the gross and net vessel capacity. Net contents Output = Gross capacity The output is determined by the ratio between initial and end pressure. In formulaic form, this is as shown below (derived from Boyle's Law): end pressure initial pressure Output = end pressure Pre-charge pressure Pre-charge pressure 0.5 bar Pre-charge pressure.0 bar 20 Product overview 203 We reserve the right to change designs and technical specifications of our products.

6 Expansion Vessels Note: pressure in bar absolute Max. output of Flexcon expansion vessels with fixed diaphragm Max. output of Flexcon 800 litre expansion vessel = 0.5, Flexcon,000 litre expansion vessel = 0.4. Max. output of Flexcon M = If the maximum output of an expansion vessel is exceeded, the diaphragm may be subjected to tensile stress. This could lead to damage to the diaphragm or even cause it to rupture. System water capacity This is the total volume of water in the entire system including heat source, radiators, pipe work etc. Expansion volume The expansion volume is calculated as follows: expansion volume = water capacity x increase in volume at average heating temperature. Example: heating temperature 90/70 C (average 80 C) = 2.89%. Safety factor We recommend including a margin of 25% when calculating the expansion volume. Gross capacity of Flexcon expansion vessels The gross capacity of Flexcon expansion vessels is calculated as follows: expansion volume x.25 Gross capacity of vessel = output Product overview 203 We reserve the right to change designs and technical specifications of our products. 2

7 Increase in volume of water in % The table below shows the percentage volume increase of water as temperature increases from 0 C to 0 C. Temperature in the Flexcon expansion vessel The maximum continuous temperature in the Flexcon expansion vessel is 70 C. The minimum permissible temperature in the Flexcon expansion vessel is -0 C. Temperature increase [ C] Volume increase [%] Volume increase [%] Temperature [ C] 22 Product overview 203 We reserve the right to change designs and technical specifications of our products.

8 Expansion Vessels Output In this table you can read off the output for various levels of initial and end pressure. We recommend a margin of at least.5 bar between the initial and end pressure. Static height [m] Initial pressure End pressure Approximation of the water capacity of the system In order to be able to determine the required capacity of the Flexcon vessel, the water capacity of the system as a whole must be calculated. If it is not possible to determine the capacity of the system, it can be approximated using the historic data shown here, based on a supply/return temperature of 90/70 C. The water capacity of the system can be approximated by multiplying the output of the system by the values specified in the table. The table refers to new systems. For older systems, we recommend using higher values. This method is an indication only and does not guarantee a precise calculation of the capacity required for your Flexcon expansion vessel. Central heating system with [l/kw] [860 kcal/h] convectors and/or air heaters 5.2 induction units 5.5 air treatment systems 6.9 panel radiators 8.8 central heating utilities mix 0.0 column radiators 2.0 cooled water utilities mix 20.0 heated ceiling and/or under-floor heating 8.5 extensive pipework (district heating) 25.8 Product overview 203 We reserve the right to change designs and technical specifications of our products. 23

9 Example calculations for Flexcon expansion vessels Example Data - water capacity = 340 liters - average heating temperature (90/70 ºC) = 80 ºC - system height = 8 m - end pressure = 3.0 bar - Flexcon expansion vessel and boiler placed above. Calculation Increase in volume in % = 2.89% 2.9% 340 x 2.9 Expansion volume = = 9.86 liters 00 Reserve 25% = 9.9 x.25 = 2.4 liters (3.0 + ) - (0.5 + ) Output = = 0.63 (3.0 + ) Required gross capacity of the 2.4 Flexcon expansion vessel = = 9.7 liters 0.63 The ideal model is a Flexcon 25/0.5. Example 2 Data - capacity unknown - boiler output = 280 kw - average heating temperature (80/60 ºC) = 70 ºC - system height = 2 m - end pressure = 3.0 bar - Flexcon expansion vessel and boiler placed below. - system components: 00% panel radiators Calculation Calculated system capacity = 280 x 8.8 = 2,464 liters Increase in volume in % = 2.25% 2,464 x 2.25 Expansion volume = = 55.4 liters 00 Reserve 25% = 55.4 x.25 = 69.3 liters (3.0 + ) - (.5 + ) Output = = (3.0 + ) Required gross capacity of the 69.3 Flexcon expansion vessel = = 84.8 liters The ideal model is a Flexcon 200/ Product overview 203 We reserve the right to change designs and technical specifications of our products.

10 Expansion Vessels Theory Minimum working pressure Specific circulation pumps demand a certain pressure (for instance bar) in their suction pipe in order to function properly. Many modern central heating boilers are protected to a minimum working pressure of 0.8 or bar. If such a pump or boiler is built in to a central heating system with a low static height, it may be more sensible to set the initial pressure of the expansion vessel to bar rather than 0.5 bar. Note that the increased initial pressure does not ensure that the minimum working pressure is replicated throughout the system! The chance of negative pressure being created high up in the system when it is cooling down, which would cause air circulation problems, is greater if the initial pressure is, say, bar than if the initial pressure were set at 0.5 bar. If the pressure in the system drops below bar, expansion vessels with initial pressure of bar cannot give back water to the system as the expansion vessel would run dry! Boost pressure In order to prevent negative pressure and air circulation problems, it is of the greatest importance that the expansion vessel does not run dry. This is why Flamco recommends that you fill the system when it is cold and at a pressure equal to the initial pressure plus 0.2 to 0.3 bar (if you are topping up a warmer system, the pressure must, accordingly, be higher). An incorrect, excessive boost pressure may lead to problems. If the system in which a expansion vessel is fitted and an initial pressure of 0.5 bar is filled to 2 bar rather than 0.8 bar, 30% more of the gross capacity will already have been used up before the central heating water expands due to the increase in temperature! (3 + ) - (0.8 + ) A = = 0.55 = 55% (3.0 + ) (3 + ) - (2 + ) B = = 0.25 = 25% (3 + ) Difference in output ( ): 30% Conclusion A higher initial pressure in a expansion vessel does not guarantee higher system pressure. An incorrect, excessive boost pressure has an undue impact. Flamco recommends filling the system to the right pressure, preferably 0.2 to 0.3 bar above the initial pressure of the Flexcon expansion vessel (when cold). Assistance To make the correct calculation in respect of which Flexcon expansion vessel to use, Flamco can offer all sorts of assistance; we can provide technical documentation, disc calculators and computer programs. N.B.: The right place for the expansion vessel is in the system s return line, on the suction side of the circulation pump. Product overview 203 We reserve the right to change designs and technical specifications of our products. 25

11 Vessel Calculation for Cooling Systems In a cooling system, Flexcon expansion vessels may have the following functions: As the system cools, the volume of the cooling water shrinks. The Flexcon expansion vessel thus gives water back to the system, maintaining system pressure. If the system is turned off, the water can return to the ambient temperature, allowing it to expand. The vessel absorbs this expansion volume. The Expansion Coefficient of Antifreeze All Flexcon expansion vessels can be used in systems in which glycol-based anti-freeze is added to the system water. The table below shows the increase in volume of various water/ethylene glycol mixing ratios. These are average values. Expansion coefficient of water with and without added anti-freeze Temperature [ C] Percentage of glycol 0% 0% 20% 30% 40% 50% Volume Increase [%] vol.% [-40 C] 44 vol.% [-30 C] 39 vol.% [-25 C] 34 vol.% [-20 C] 28 vol.% [-5 C] 20 vol.% [-0 C],3 0,78 0,64 0,44 0,3 0, Temperature [ C] 0 vol.% = water 26 Product overview 203 We reserve the right to change designs and technical specifications of our products.

12 Expansion Vessels Calculation for a Cooling System The following data is required to calculate the required volume of Flexcon expansion vessel: Volume of system water. Percentage of added anti freeze. Lowest system temperature. Maximum system temperature (= highest ambient temperature). Water - anti-freeze mix expansion (percentage). Static height of the system above the vessel. Maximum working pressure. The initial pressure of the expansion vessel is selected to match the static height of the system (above the expansion vessel). The following formula can be used to calculate the fill level of the expansion vessel at the lowest operating pressure. lowest operating pressure - initial pressure I = fill level lowest operating pressure This means that the residual factor of the expansion vessel can be determined. Residual factor = - fill level. The end pressure must be 0.5 bar lower than the set pressure of the safety valve. The output is calculated using the formula below: end pressure - lowest operating pressure II x residual factor = output end pressure Note: Pressure in bar absolute. Max. output of Flexcon expansion vessels with fixed diaphragm Max. output of Flexcon 800 liter expansion vessel = 0/5, Flexcon.000 liter expansion vessel = 0/4. Max. output of Flexcon M = The temperature in the Flexcon expansion vessel must remain above -0 ºC. A buffer vessel or Flexcon intermediate expansion vessel may have to be fitted between the system and the Flexcon expansion vessel. For calculations of Flexcon expansion vessels for Solar installations, refer to the spreadsheet on Product overview 203 We reserve the right to change designs and technical specifications of our products. 27

13 Flamco Flexcon The Top in Pressure Expansion Vessels Flamco s standard programme covers a wide range of expansion vessels from 2-8,000 liters with a wide choice of pre-charge pressures and maximum operating pressures. All models are characterised by their construction, superior quality diaphragms or bladders, high quality coating on the expansion vessel itself and efficient production methods. Why Flexcon is the best choice The rolling action of the diaphragm prevents stretching.this has a significant impact on its service life. The unique clamp construction damages neither the diaphragm nor the two halves of the expansion vessel. The thread of the water connection is uncoated to ensure easy and water tight installation. All vessels are factory tested. The two halves of the vessel are coated prior to assembly. Flexcon expansion vessels are delivered in a stackable cardboard packaging with hand grip and each box contains clear assembly instructions. Flexcon expansion vessels are always in stock at our wholesalers and our own warehouses. Qualified Flamco employees will be happy to give you advice and support. They are just a telephone call away. FLEXCON 2-4 FLEXCON 8-25 FLEXCON FLEXCON 0 -,000 Other reasons for choosing Flexcon Excellent service before, during and after installation. Handy accessories for mounting or disconnecting Flexcon expansion vessels. Our diaphragms are suitable for use with antifreeze. Exact details are available on request. The nitrogen valve of Flexcon 8-80 litre expansion vessels is countersunk and and is protected by a dust cap and plastic cover. The two halves of the vessel are coated prior to assembly. 28 Product overview 203 We reserve the right to change designs and technical specifications of our products.

14 Expansion Vessels Systems with Flexcon expansion vessels. Flexcon expansion vessel. 2. Prescor Safety valve. 3. Flamco tundish. 4. Flamcovent or Flexair air separator. 5. Flexfast quick-release coupling. 6. Flexcon pressure gauge. The diaphragm has a extremely low permeability The thread of the water connection is uncoated to ensure easy and water tight installation. The rolling action of the diaphragm prevents stretching. This has a significant impact on its service life. The nitrogen valve of Flexcon 8-80 litre expansion vessels is countersunk and and is protected by a dust cap and plastic cover. The unique clamp construction damages neither the diaphragm nor the two halves of the expansion vessel. When cold, the nitrogen cushion presses the diaphragm against the wall of the Flexcon expansion vessel. When heated, the expansion vessel partially fills with water and the nitrogen gas is compressed. When heated further, the expansion vessel portion fully fills with water and the nitrogen gas is fully compressed. If the pressure rises too high, the Prescor valve opens. The excess water/steam is discharged. Product overview 203 We reserve the right to change designs and technical specifications of our products. 29

15 CONTRA-FLEX For sealed heating and chilled water (cooling) installations. When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested. Diaphragm: Flexible rubber with rolling action. Suitable for addition of glycol-based anti-freeze up to 50%. Max. temperature on diaphragm (EN 383/8): 70 C. Max. temperature at (heating) outlet: 20 C. In accordance with Pressure Equipment Directive 97/23/EC. Contra-Flex W 8-35 Maximum operating pressure: 3.0 bar. Deep drawn zinc plated steel clench ring. White (RAL 900) epoxy powder coating. Contra-Flex W / 4" Contra-Flex W / 4" Contra-Flex W / 4" Contra-Flex W / 4" Contra-Flex W / 4" Contra-Flex W Maximum operating pressure: 6.0 bar. Deep drawn zinc plated steel clench ring. White (RAL 900) epoxy powder coating. Contra-Flex W / 4" Contra-Flex W " Contra-Flex Maximum operating pressure: 6.0 bar. All welded construction. Red (RAL 3002) epoxy powder coating. Contra-Flex " Contra-Flex " Product overview 203 We reserve the right to change designs and technical specifications of our products.

16 Expansion Vessels FLEXCON C For sealed heating and chilled water (cooling) installations. When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested. The diaphragm is clamped between two vessel halves, preventing mechanical damage to the diaphragm or vessel halves during use. Compared to other bladder type vessels, the clamp ring construction cuts the air to water diaphragm surface ratio in half, resulting in a much lower permeability of the gas charge, a greater reliability and overall life expectancy of the vessel. The thread of the system connection is uncoated, ensuring problem free connection. Diaphragm: Flexible rubber with rolling action. Suitable for addition of glycol-based anti-freeze up to 50%. Red (RAL 3002) epoxy powder coating. Max. temperature on diaphragm (EN 383/8): 70 C. Max. temperature at (heating) outlet: 20 C. In accordance with Pressure Equipment Directive 97/23/EC. Flexcon C 2-25 Maximum operating pressure: 3.0 bar. Deep drawn zinc plated steel clench ring. Flexcon C 2 2 0, / 4", Flexcon C / 4" Flexcon C 4 4 0, / 4", Flexcon C / 4" Flexcon C / 4" Flexcon C / 4" Flexcon C 8 8 0, / 4" Flexcon C / 4" Flexcon C , / 4" Flexcon C / 4" Flexcon C Maximum operating pressure: 3.0 bar. Deep drawn zinc plated steel clench ring. Flexcon C / 4" Flexcon C , / 4" Flexcon C 50 50, / 4" Flexcon C / 4" Flexcon C / 4" Flexcon C , " Flexcon C 80 80, " Flexcon C " Flexcon C " Product overview 203 We reserve the right to change designs and technical specifications of our products. 3

17 Flexcon C Maximum operating pressure: 6.0 bar. All welded construction. Red (RAL 3002) epoxy powder coating. [litres] (bar) Height (mm) 8 Flexcon C " 23,8 70 Flexcon C " 23,8 8 7 Flexcon C " 23, Flexcon C 0 0 specify " 23, Flexcon C " 25, Flexcon C " 25, Flexcon C " 25, Flexcon C specify " Flexcon C " 38, Flexcon C " 38, 8 72 Flexcon C " 38, Flexcon C specify " Flexcon C " 56, Flexcon C " 56, Flexcon C " 56, Flexcon C specify " Flexcon C " 76,4 740 Flexcon C " 76,4 74 Flexcon C " 76,4 742 Flexcon C specify " Flexcon C " 92,9 760 Flexcon C " 92,9 76 Flexcon C " 92,9 762 Flexcon C specify " Flexcon C " 26,9 780 Flexcon C " 26,9 78 Flexcon C specify " Flexcon C " 45,9 790 Flexcon C specify " Product overview 203 We reserve the right to change designs and technical specifications of our products.

18 Expansion Vessels FLEXCON For sealed heating and chilled water (cooling) installations. When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested. All welded construction. Diaphragm: Flexible rubber with rolling action. Suitable for addition of glycol-based anti-freeze up to 50%. Red (RAL 3002) epoxy powder coating. Max. temperature on diaphragm (EN 383/8): 70 C. Max. temperature at (heating) outlet: 20 C. In accordance with Pressure Equipment Directive 97/23/EC. Flexcon bar Maximum operating pressure: 6.0 bar. Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon 0 0 specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Product overview 203 We reserve the right to change designs and technical specifications of our products. 33

19 Flexcon bar Maximum operating pressure: 0.0 bar. Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon 0 0 specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon " Flexcon specify " Product overview 203 We reserve the right to change designs and technical specifications of our products.

20 Expansion Vessels FLEXCON TOP For sealed heating and chilled water (cooling) installations. When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested. Diaphragm: Flexible rubber with rolling action. Suitable for addition of glycol-based anti-freeze up to 50%. Red (RAL 3002) epoxy powder coating. Max. operating pressure: 6.0 bar. Max. temperature on diaphragm (EN 383/8): 70 C. Max. temperature at (heating) outlet: 20 C. In accordance with Pressure Equipment Directive 97/23/EC. Flexcon Top 2-25 Deep drawn zinc plated steel clench ring. Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top 8 8 specify / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top 2 2 specify / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top 8 8 specify / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top specify / 4" Flexcon Top Deep drawn zinc plated steel clench ring. Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top specify / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top / 4" Flexcon Top specify / 4" Flexcon Top " Flexcon Top " Flexcon Top " Flexcon Top specify " Product overview 203 We reserve the right to change designs and technical specifications of our products. 35

21 FLEXCON SOLAR Expansion vessels for solar powered installations. Suitable for addition of glycol-based anti-freeze up to 50%. In accordance with Pressure Equipment Directive 97/23/EC. Flexcon Solar 8-25 Deep drawn zinc plated steel clench ring. White (RAL 900) epoxy powder coating. Maximum operating pressure: 8.0 bar. Maximum temperature load on the diaphragm: 0 C. Flexcon Solar / 4" Flexcon Solar / 4" Flexcon Solar / 4" Flexcon Solar / 4" Flexcon Solar Deep drawn zinc plated steel clench ring. White (RAL 900) epoxy powder coating. Maximum operating pressure: 8.0 bar. Maximum temperature load on the diaphragm: 0 C. Flexcon Solar / 4" Flexcon Solar / 4" Flexcon Solar " Flexcon Solar All welded construction. Red (RAL 3002) epoxy powder coating. Maximum operating pressure: 0.0 bar. Maximum temperature load on the diaphragm (EN 383/8): 70 C. Flexcon Solar " Flexcon Solar " Flexcon Solar " Flexcon Solar " Flexcon Solar " Flexcon Solar " Flexcon Solar " Flexcon Solar " Product overview 203 We reserve the right to change designs and technical specifications of our products.

22 Expansion Vessels CUBEX R For sealed heating and chilled water (cooling) installations. When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested. Deep drawn zinc plated steel clench ring. Diaphragm: Flexible rubber with rolling action. Suitable for addition of glycol-based anti-freeze up to 50%. Max. operating pressure: 3.0 bar. Max. temperature on diaphragm (EN 383/8): 70 C. Max. temperature at (heating) outlet: 20 C. In accordance with Pressure Equipment Directive 97/23/EC. Cubex R Cubex R / 4" Cubex R / 4" Cubex R / 4" FLEXCON P Expansion vessel with reduced height and suspension eye for use in sealed heating and cooling installations. When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested. The oval shape combined with the practical suspension eye enables quick and easy mounting, optimising the use of space. Thanks to the design no rest water remains in the vessel. Deep drawn zinc plated steel clench ring. Suitable for addition of glycol based anti freeze up to 50%. Red (RAL 3002) epoxy powder coating. Max. working pressure: 3.0 bar. Max. temperature on diaphragm (EN 383): 90 C. Max. temperature at (heating) outlet: 20 C. Vessel of high tensile steel. Diaphragm material: butyl rubber. In accordance with Pressure Equipment Directive 97/23/EC. Flexcon P Flexcon P / 4" Flexcon P / 4" Flexcon P / 4" Flexcon P / 4" Product overview 203 We reserve the right to change designs and technical specifications of our products. 37

23 Flexcon M A Flexcon M expansion vessel offers you advantages in installations with big differences in the static pressure and set pressure of the safety valve. All Flexcon M expansion vessels are fitted with an exchangeable bladder. This bladder forms the separation between the expansion water inside the bladder and the nitrogen cushion. The Flexcon M s flange construction allows you to replace the butyl-rubber bladder. High efficiency means that the capacity of the vessel is used to best effect. As an option, the Flexcon M expansion vessel can be fitted with a Flexvent Super Automatic Air Vent. Each Flexcon M expansion vessel is fitted with a pressure gauge as standard. From 2,800 litres all Flexcon M expansion vessels are fitted with an adjustable foot. FLEXCON M Systems with more than one boiler:. Flexcon expansion vessel (depending on boiler capacity). 2. Prescor safety valve or Prescomano. 3. Flamco tundish. 4. Flexcon Connection Assembly ½". 5. Flexcon pressure gauge or combined pressure gauge/thermometer. 6. Flamco venting equipment. 7. One or more Flexcon M vessels. 8. Flamco pressurisation unit. 38 Product overview 203 We reserve the right to change designs and technical specifications of our products.

24 Expansion Vessels FLEXCON M For heating and chilled water (cooling) installations. The vessel is equipped with a replaceable bladder made from high-quality butyl rubber in compliance with EN 383/8. Particular benefits of use are achieved in installations with large variations between static pressure and pre-set pressure of the safety valve. Accessories to be ordered separately. Replaceable bladder. With inspection cover and pressure gauge. With height-adjustable feet (From 2,800 litres). Delivered ready for connecting to system. Suitable for addition of glycol-based anti-freeze up to 50%. Red (RAL 3002) epoxy powder coating. Max. temperature on diaphragm (EN 383/8): 70 C. Max. temperature at (heating) outlet: 20 C. In accordance with Pressure Equipment Directive 97/23/EC. Material quality: - ASTM/ISO: A8 class 60 / S235JRG2. Flexcon M bar Maximum operating pressure: 6.0 bar. Flexcon M " Flexcon M / 4" Flexcon M / 4" Flexcon M / 4" Flexcon M / 2" Flexcon M / 2" Flexcon M / 2" Flexcon M " Flexcon M / 2" Flexcon M / 2" Flexcon M / 2" Flexcon M DN 00 * Flexcon M DN 00 * * Flanges as per EN 092- PN 6. Flexcon M bar Maximum operating pressure: 0.0 bar. Flexcon M " Flexcon M / 4" Flexcon M / 4" Flexcon M / 4" Flexcon M / 2" Flexcon M / 2" Flexcon M / 2" Flexcon M / 2" Flexcon M " Flexcon M / 2" Flexcon M / 2" Flexcon M / 2" Flexcon M DN 00 * Flexcon M DN 00 * * Flanges as per EN 092- PN 6. Product overview 203 We reserve the right to change designs and technical specifications of our products. 39

25 Flexcon Pro A Flexcon Pro expansion vessel offers you extra-special advantages in installations with big differences in the static pressure and set pressure of the safety valve. Diaphragm pressure expansion vessel with an exchangeable bladder according to DIN 4807/3. For the use in heating installations with a working temperature of 20 C (maximum temperature (bladder) of 70 C) and for chilled water (cooling and airconditioning) installations. From 770 liters or more the Flexcon Pro expansion vessels are fitted with a pressure gauge. High efficiency means that the capacity of the expansion vessel is used to best effect. Thanks to its threaded connection, a Flexcon Pro expansion vessel can be installed easily and costeffectively onto the system. FLEXCON PRO Systems with more than one boiler:. Flexcon expansion vessel (depending on boiler capacity). 2. Prescor safety valve or Prescomano. 3. Flamco tundish. 4. Flexcon Connection Assembly ½". 5. Flexcon pressure gauge or combined pressure gauge/thermometer. 6. Flamco venting equipment. 7. One or more Flexcon M vessels. 8. Flamco automatic top-up unit. 40 Product overview 203 We reserve the right to change designs and technical specifications of our products.

26 Expansion Vessels FLEXCON PRO For heating and chilled water (cooling) installations. Replaceable bladder. Red (RAL 3002) epoxy powder coating. Suitable for addition of glycol-based anti-freeze up to 50%. Max. operating pressure: 6.0 bar. Max. temperature on diaphragm (EN 383/8): 70 C. Max. temperature at (heating) outlet: 20 C. In accordance with Pressure Equipment Directive 97/23/EC. Material quality: ASTM/ISO: A8 class 60 / S235JRG2. Flexcon PRO Flexcon PRO " Flexcon PRO " Flexcon PRO " Flexcon PRO " Flexcon PRO " Flexcon PRO " Flexcon PRO " Flexcon PRO " Flexcon PRO " Flexcon PRO " Product overview 203 We reserve the right to change designs and technical specifications of our products. 4

27 Flexcon VSV/VB Intermediate Vessels In sealed heating systems, the supply temperature can reach 20 C. The maximum permissible continuous temperature load on the diaphragm in the Flexcon vessels is 70 C in compliance with the appropriate standard. That is why Flexcon expansion vessels must be fitted in the return line. If the temperature in the return line is not capped at 70 C, an intermediate vessel must be fitted. In this intermediate vessel the expansion water is allowed to cool. The maximum supply temperature of the water for Flexcon VSV/VB vessels is 60 C. The extent to which the expansion water is cooled depends on the volume of the intermediate vessel. An intermediate vessel must not be insulated. Around the vessel and between the vessel and the ceiling there must be clearance of at least 400 mm. System water flows from the installation into the top of the intermediate vessel. The hot water mixes in the vessel with the cold water already in the vessel. From the bottom of the vessel, significantly cooler water is fed into the expansion vessel. The temperature of the expansion water that is supplied to the Flexcon expansion tank remains under the maximum temperature permissible for the membrane. Calculation for a Flexcon VSV/VB intermediate vessel The required volume of a Flexcon VSV/VB intermediate vessel depends on the supply temperature and a percentage of the net expansion volume as per the table below. Supply temperature Flexcon intermediate vessel volume % of the net expansion volume 90-0 C 5-25 C C C 60 Example calculation for a Flexcon intermediate vessel Data: - expansion volume =.740 litres - supply temperature (05/95 C) = 05 C Calculation: Required vessel volume = 5% of the expansion volume 5 x.740 = = 26 litres 00 The ideal intermediate vessel is thus the Flexcon VSV 350. Flexcon intermediate vessel connection diagram The intermediate vessel functions according to the principle that hot water is lighter than cold water. As the intermediate vessel is filled with water from the top, the heat will be concentrated there. System water that has been allowed to cool will, due to its greater density, fall and this cooler water will naturally be forced towards the connection on the underside of the expansion vessel. (Automatic) Vent FLEXCON VSV Drain Expansion line 42 Product overview 203 We reserve the right to change designs and technical specifications of our products.

28 Expansion Vessels FLEXCON INTERMEDIATE VESSELS Vessels to protect Flexcon expansion vessels on elevated temperature systems. The vessels are fitted in between the expansion vessel and the system return. Red (RAL 3002) epoxy powder coating. Suitable for addition of glycol-based anti-freeze up to 50%. In accordance with Pressure Equipment Directive 97/23/EC. Material quality: ASTM/ISO: A8 class 60 / S235JRG2. Flexcon VSV bar Maximum working temperature (design): 60 C. Connection to Vessel System (F) (F) Flexcon VSV / 2" / 2" Flexcon VSV / 2" / 2" Flexcon VSV " 2" Flexcon VSV " 2" Flexcon VSV " 2" Flexcon VSV bar Maximum working temperature (design): 60 C. Connection to Vessel System (F) (F) Flexcon VSV / 2" / 2" Flexcon VSV / 2" / 2" Flexcon VSV " 2" Flexcon VSV " 2" Flexcon VSV " 2" Flexcon V-B bar Maximum working temperature (design): 20 C. Connection Vessel System (F) V-B / 2" / 2" V-B " 2" Flexcon V-B bar Maximum working temperature (design): 60 C. Connection Vessel System (F) V-B / 2" / 2" V-B " 2" Product overview 203 We reserve the right to change designs and technical specifications of our products. 43