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Total volume of water used in the system must be above a certain volume threshold so the cooling system used for comfort and   industrial purposes function smoothly and efficiently. This volume is determined based on the  capacity and the required control accuracy. If the total volume of water in the system is below this limit, SANCAK-BF series Buffer Tank may be added to increase the thermal  capacity.


It is a tank design and manufactured specially for the purpose of increasing the water volume of the system in all cool water applications requiring additional water volume.


General Specifications;

  •   Tanks with capacities varying between 100 liter and 5000 liter are offered for the use of our customers.
  •   The number of plates used in the tank are consistent with the tank volume so as to ensure homogenous heat distribution is achieved and heat accumulation is prevented. Thus the air trapped in water is easily separated and discharged from the upper part of the tank.
  •   It is delivered as insulated perfectly in order to minimize the energy loss.
  •   External surface is protected against corrosion with two layers of industrial primer.
  •   Flange connections with dimensions designed in accordance with the tank volume are ready to assemble to the  system.
  •   There are fittings for air relief valve and discharge valve.
  •   It is tested under a pressure that is 1.5 times higher than the operating pressure  before delivery to the customer.

Application areas

Industrial cooling applications

  •   Machine cooling applications
  •   All process cooling applications requiring precise heat control

Cooling applications aimed at air-conditioning

  •   High buildings (residences, business centres, hotels)
  •   Buildings requiring cooling in winter (shopping malls, factories)
  •   All cooling systems requiring separation with a heat exchanger

Capacity calculation tips
The following methods are used to determine whether a buffer tank is needed for cooled water systems and to calculate the volume of SANCAK-BF series buffer tank if it is needed.

Minimum Water Volume Required (I) = Total Cooling Capacity (kW) x B (l/kW)

Coefficients recommended by cooling group manufacturers may be used in the calculation  of the Minimum Water Volume required for the system.

Then, System’s Active Water Volume must be found. The volume that should be taken into account it the volume of water circulated  in the evaporator even in the case of the minimum loading. Water volume of the equipment by-passed by the automatic valves (or of the zones that are not a part of the circulation system) should not be taken into account as majority of them shall not contribute to the active volume when operated under low load. In practice, taking water volumes of the pipes in the system into account shall be a safe solution. Water intake capacities per metre are given for steel pipes used in the mechanical installation.

Type of application B
General comfort applications 6
Applications requiring precise heat control (process, etc.) 10


Pipe diameter (inch) Water capacity (l/m)
1/2″ 0.2
3/4″ 0.3
1″ 0.5
1 1/4″ 0.8
1 1/2 1.3
2″ 2.1
2 1/2″ 3.1
3″ 4.8
4″ 8.3
5″ 13.0
6″ 18.8
8″ 32.4
10″ 51.1
12″ 72.8

Volume of the buffer tank is calculated by deducting the system’s water volume from the required water volume.

Volume of Buffer Tank (l)= Minimum Volume of Water Required- System’s Active Water Volume

If the result of this operation reveals a positive value, a buffer tank should be used and a tank with a capacity closest to the value found should be selected. If the required volume exceeds 5000 litre or there are restrictions in terms of layout, multiple tanks may also be used in the system.

Calculation example
There are steel pipes with total length of   550 m that are not by-passed by automatic valves in a process cooling system with total cooling capacity of 700 kW and requiring precise heat control. Pipes with 6″ diameter are used for 150 metre of the line, 4 ” for  100 metre and 3″ for 200 metre. Let’s find if a buffer tank is needed in this system.

Minimum Volume of Water Required= 700kWx10IkW=7000I
System’s Active Water Volume=(150×18.8)+(100×8.3)+(200×4.8)=4610I
Buffer Tank Volume=7000 – 4610 = 2390 I

It is required to use 1 SANCEK-BF series 2500/10-V type buffer tank with a   capacity  of 2500l.

Project design recommendations

The locatıon of the tank in the cooled water line should be in compliance with the intended purpose within the system as SANCAK-BF Series Buffer Tank is used for both preventing overloading with the cooling group compressor and surges in the temperature of water fed into the system.


It is recommended to install the tank before the cooling group in typical comfort applications where the function of buffer tank in preventing overloading with the compressor is important.



If it is used in an industrial cooling system, it will be more beneficial to install the tank after the group and before the system as the main purpose in this system is precise control of the process water temperature.

Important Note : If more than one tank shall be used in the system, it is recommended to connect the tanks in serial order rather than parallel order in order to ensure good circulation without any short-circuits.


Technical Specifications 


Capacity 100 – 5000 Liter
Area of Use Water temperature that doesn’t exceed 90 °C
Operating pressure 10 Bar
Installation position Vertical (horizontal as an option)
Coating 2 layers of anti-rust paint on external surface
Heat Insulation Open-cell soft polyurethane in 50 mm thickness
Protective casing Vinyl

    B Air Relief                                    B Air Relief                                     B Air Relief


Discharge C                                   Discharge C                                       Discharge C



Cihaz Tipi  

Yapı Grubu


Kapasite (Lt.)

Ölçüler Bağlantı Ağızları  Boş Ağırlık (kg.)


100 500 1050 DN32 1/2″ 3/4″ 60
BF-300/10-V 300 700 1350 DN50 1/2″ 3/4″ 105
BF-500/10-V 500 850 1450 DN65 1/2″ 1″ 180
BF-750/10-V 750 850 2050 DN80 1/2″ 1″ 230


1000 950 2110 DN80 3/4″ 1 1/4″ 310
BF-1500/10-V 1500 1150 2000 DN100 3/4″ 1 1/2″ 480
BF-2000/10-V 2000 1250 2350 DN100 3/4″ 1 1/2″ 580
BF-2500/10-V 2500 1400 2350 DN125 3/4″ 2″ 670


3000 1400 2770 DN125 3/4″ 2″ 850
BF-4000/10-V 4000 1500 3150 DN150 3/4″ 2″ 1120
BF-5000/10-V 4500 1600 3070 DN150 3/4″ 2″ 1410