Expansion vessels for heating systems

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1 Expansion vessels for heating systems 6 cal pro

2 cal pro E X P A N S I O N V E S S E L S - PED 97/23/CE DRAWING/ ADVANTAGES OF CLOSED EXPANSION VESSELS The chart displayed on the back page of this information sheet shows how the volume or water increases due to a rise in temperature. In practice, water cannot be compressed and therefore any increase in water volume must be accomodated in an expansion vessel designed and sized for that purpose. The ZILMET closed expansion vessel, which uses a synthetic rubber membrane, has many advantages over open vented systems. Problems associated with open expansion tanks include the following: F I X E D M E M B R A N E E X P A N S I O N V E S S E L S evaporation of water necessitating fresh water top up; corrosion and fouling of system components due to fresh water introduction and exposure to atmosphere; greater heat losses due to conduction and water evaporarion; longer installation time (higher cost) due to additional components, pipework, insulation and access diffuculties; air venting problems due to poor siting and sizing of feed and expansion pipe connections. The expansion vessel with fixed membrane has been very successful due to the fact that the possibility of contact between water and air (gas) can be completely avoided.

3 cal pro E X P A N S I O N V E S S E L S - technical specification - code capacity ltr drawing diameter mm height mm max press. system temp. connect bar C bar C bar C bar C bar C bar C bar C bar C bar C bar C bar C bar C bar C bar C bar C 1 G bar C 1 G bar C 1 G bar C 1 1 /2 G - Max working temperature: 99 C system - HEADS AND SHELL: carbon steel, cold pressed - MEMBRANE: Synthetic SBR rubber according to DIN 4807 norms - PAINT: Epoxy-polyester powder - KITEMARK APPROVAL: Registration n. KM (for 4 and 8 litres). N.B. THE INSTALLATION OF THE TANK HAS TO BE MADE WITH THE OUTLET PIPE IN DOWN WARD DIRECTION. P.S. For further information, please contact our specialized staff. optional accessories - code description safety valve 2,5 bar 1 1 /2 fem connection pressure gauge 0-4 bar Ø 63 hind inlet 1 / pressure gauge 0-4 bar Ø 50 hind inlet 1 / pressure gauge 0-4 bar Ø 63 radial inlet 1 / pressure gauge 0-4 bar Ø 50 radial inlet 1 /4 - Nitrogen Pre-charged tank-initial pressure Working expansion vessel Pi - Vi - Vi initial nitrogen volume Pf - Vf Nitrogen - Vu useful volume H2O Vu - Vf nitrogen final volume H2O H2O - Pf final pressure

4 assembly diagram - E X P A N S I O N V E S S E L S - A draining B safety valve cal pro C air bleeder D gate valve E F backflow preventer pressure gauge BOILER G pump H utilities I L mixing valve ZILMET expansion tank M boiler Selection of expansion vessel size The vessel sizing formula is as follows: e X C V = = Vu where: Vu = Total useful volume of tank = Vi-Vf Vi = initial volume = V Vf = final volume. e = expansion coefficient corresponding to the difference between the cold system water temperature (heating off) and the max working temperature. In standard plants: e C = 0,04318 (Tmax= 99 C - Tmin= 10 C). = Total water capacity of the system in litres: boiler, pipework, radiators etc (as a general approximation, C is between 10 and 20 litres for every 1000 kcal/h of boiler output). Pi = Initial charge pressure (absolute) of vessel. This pressure must not be lower than the hydrostatic pressure at the point where the tank is connected to the system. Pf = Maximum operating pressure (absolute) of the relief (safety) valve, taking into account any differences in level between the vessel and the safety valve. e X C V = = Vu EXAMPLE C = 500 litres Pi = 1,5 bar (=2,5 ata) Pf = 4 bar (=5,0 ata) 0,04318 x 500 V = = 43.2 litres 2, ,04318 x 500 V = = 43.2 litres 2,5 1-5

5 E X P A N S I O N V E S S E L S - cal pro coefficient of use of expansion tank at different pressure surges Pi = initial pressure - bar Pf = final pressure (safety valve calibration) 1 0, ,40 0, ,50 0,33 0, ,58 0,42 0,28 0, ,62 0,50 0,37 0,25 0, ,67 0,55 0,44 0,33 0, ,70 0,60 0,50 0,40 0,30 0, ,63 0,54 0,45 0,36 0,27 0, ,58 0,50 0,41 0,33 0,25 0, ,62 0,54 0,47 0,38 0,30 0, ,57 0,50 0,42 0,35 0,28 water content of pipes in litres/metre DN (mm) litres/m. DN (mm) litres/m. DN (mm) litres/m coefficient of water expansion at different temperatures chart 1 - C coefficient C coefficient 0 0, , , , , , , , , , , , , , , ,04343 % expansion - water temperature - calculation of the expansion vessel volume for conditioning systems In air conditioning systems, initial pressure is equal to the maximum system pressure, corresponding to the maximum achievable temperature relative to the ambient temperature, which should be fixed at 50 C for safety. The final working pressure is that achieved at minimum temperature of approximately 4 C. Under these conditions, the vessel sizing formula is as follows: C x e V = V = 1 - (Pf/Pi) C x e 1 - (Pf/Pi)

6 cal pro ZILMET S.p.a Limena - PD - ITALY - Via del Santo, Via Visco, 2 - Via Colpi, 30 - Via Tamburin, 15/17 Tel Fax Bagnoli di Sopra - PD - ITALY Via V Strada ZILMET DEUTSCHLAND GMBH ZUM EICHSTRUCK, WENDEN-GERLINGEN Telefon Telefax REV. 20/12/2005 EMI /BULGARIA GERMANIA INGHILTERRA - GB GERMANIA DIN GOST TÜV - RUSSIA TURCHIA

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