VAREM 질소압력탱크

Why a membrane vessel is preferable to a diaphragm vessel

Varem  has carried out a series of tests in its laboratories to test the operation of its vessels for pumping systems and compare them with other products on the market.

In particular, it carried out a series of parallel tests on vessels with balloon membrane and with diaphragm membrane, which offered proof of the significant superiority of the first solution, used by Varem, in given conditions and also drew attention to the limitations of the second solution.

Membrane Vessel

Diaphragm Vessel

   

The test carried out was the EN13831 cycle test indicated in the Directive PED 97/23/EC, which provides for correct operation of the product for 50,000 cycles at an average temperature of 30°C.

Naturally, one of the most important aspects for determining correct operation of an expansion vessel is the complete discharge of the water contained, for the whole duration of the test. Therefore, we carried out the tests also paying close attention to this aspect, monitoring the performances of the two products being compared in two situations: with pump shut down at 3 bar and at 5 bar.

Case 1: shut down pressure of 3 bar

 

 

At a pump shut down pressure of 3 bar, the expansion vessel is filled with a usable volume of water equivalent to 25% of the nominal value. By way of example, a tank with a nominal value of 100 l contains 25 l of water.

In this configuration, comparison between the two types of tank showed that the test was passed without any problem. 

Case 2: shut down pressure of 5 bar

 

 

At a pump shut down pressure of 5 bar, the expansion vessel is filled with a usable volume of water equivalent to 50% of the nominal value. By way of example, a tank with a nominal value of 100 l contains 50 l of water.

In this configuration, comparison between the two types of tank showed a significant reduction in the discharge capacity of the diaphragm vessel, which starting from 4000 cycles was measured as 20%. In the case of the 100 l tank, the usable volume of water discharged decreased from the 50 l expected to 40 l.

Analysis of the tanks at the end of the 50,000 test cycles brought to light the reasons for this abnormal reaction of the diaphragm vessel.

The solution with shut down pressure of 5 bar caused yielding of the diaphragm membrane in the fastening area, as shown in the images below:

 

In fact, this area is subjected to increased stress as the pressure inside the vessel increases, contrary to membrane vessels in which the pressure is spread evenly over the whole of the surface of the membrane.

As a direct consequence of this, the diaphragm behaves abnormally, as indicated in the sequence of images below:

 

The rubber stretches until it blocks the water inlet/outlet before adhering fully to the inner walls of the vessel, retaining 20% of the usable volume of water inside the vessel.

 

This situation creates two negative consequences for operation of the system:

  1. Increased electricity consumption 
    A reduction in the usable volume of water discharged causes a directly proportional increase in number of pump start-ups and consequently an increase in electricity consumption 
  2. Decreased water quality
    The presence of 20% of water retained inside the vessel, causing the problem of incorrect circulation of liquid with substantial stagnation, has the direct consequence of reducing the quality of water in systems used for sanitary water, as well as exposure to the risk of Legionella.

Therefore, we conclude that in systems with pressures in excess of 3 bar, the use of membrane vessels is highly recommended. 

WATER LINE VERTICAL

  • Vertical multifunction water tanks
  • Replaceable membrane
  • Available with galvanised or painted flange
  • Red color
  • Pre charge pressure 2 bar

LS-LSV

INTERVAREM LS CE

-10 + 99 °C

 

Item

Std. Code.

Capacity

Max. pressure

Connection

Dimensions

Packaging

Qty/
pallet

   

it

bar

inch

mm

m3

n.

LS 5

S2005361CS000000

5

8

1’

160x332

0.010

210

LS 8*

S2008361CS000000

8

8

1’

200x348

0.015

144

LS 12*

S2012361CS000000

12

8

1’

270x308

0.024

72

LS 19*

S2019361CS000000

19

8

1’

270x421

0.031

63

LS 20*

S2020361CS000000

20

10

1’

250x500

0.038

56

LS 24*

S2024361CS000000

24

8

1’

351x348

0.045

54

LS 25*

S2025361CS000000

25

8

1’

290x480

0.041

63

LS 40*

S2040361CS000000

40

10

1’

320x587

0.066

36

Available s/s flange and 
blue ral 5051 upon request
* Available version in white color,
stainless steel flange and 3,5 bar
pre charge pressure

MAXIVAREM LS CE

-10 + 99 °C

 

Item

Std.Code

Capacity

Max. pressure

Connection

Dimensions

Packaging

Qty/
pallet

   

it

bar

inch

mm

m3

n.

LS V 50

US050361CS000000

50

10

1’

379x759

0.126

15

LS V 60

US060361CS000000

60

10

1’

379x815

0.131

15

LS V 80

US080361CS000000

80

10

1’

450x789

0.170

15

LS V 100

US100361CS000000

100

10

1’

450x910

0.200

15

LS V 150

US150461CS000000

150

10

1’1/2

554x1020

0.340

8

LS V 200

US200461CS000000

200

10

1’1/2

554x1213

0.407

8

LS V 300

US300461CS000000

300

10

1’1/2

624x1373

0.596

6

LS V 500

US500461CS000000

500

10

1’1/2

775x1460

1.300

1

LS V 750**

US750461CS000000

750

10

1’1/2

786x1925

2

1

LS V 1000**

USN10H61CS000000

1000

10

2’

933x1912

2.200

1

LS V 2000**

USN20H61CS000000

2000

10

2’

1280x2241

2.500

1

Available stailess steel  flange and 
blue ral 5051 upon request
** Available version not CE marked
also with capacity 1500 lt

LS H 

Water Line

WATER LINE HORIZONTAL

  • Horizontal multifunction water tanks
  • Replaceable membrane
  • Available with galvanised or painted flange
  • Red Color
  • Pre charge pressure 2 bar

 

INTERVAREM - MAXIVAREM LS CE

-10 + 99 °C

 

Item

Std. Code

Capacity

Max.
pressure

Connection

Dimensions

Packaging

Qty/
pallet

   

it

bar

inch

mm

m3

n.

HORIZONTAL

LS H 19*

S2H19361CS0BP000

19

8

1’

270x421

0.031

63

LS H 20*

S2H20361CS0BP000

20

10

1’

250x500

0.038

56

LS H 40

US041361CS000000

40

10

1’

320x587

0.066

36

LS H 50

US051361CS000000

50

10

1’

379x759

0.126

15

LS H 60

US061361CS000000

60

10

1’

379x815

0.131

15

LS H 80

US081361CS000000

80

10

1’

450x789

0.170

15

LS H 100

US101361CS000000

100

10

1’

450x910

0.200

15

LS H 200

US201461CS000000

200

10

1’1/2

554x1213

0.407

8

LS H 300

US301461CS000000

300

10

1’1/2

624x1373

0.596

6

 

* Available version with s/s flange and 
3,5 bar pre charge pressure

 

LSP – LS PV

Water Line

WATER LINE VERTICAL / HIGH PRESSURE

  • Vertical multifunction water tanks
  • Replaceable membrane
  • Available with galvanised or painted flange
  • Red color
  • Pre charge pressure 2 bar

 

PLUSVAREM

-10 + 99 °C

 

Item

Std. Code

Capacity

Max.
pressure

Connection

Dimensions

Packaging

Qty/
pallet

   

it

bar

inch

mm

m3

n.

HIGH PRESSURE

LS P 8

S5008361CS000000

8

16

1’

160x332

0.015

144

LS P 20

S5020361CS000000

20

16

1’

250x509

0.038

56

LS PV 50

S5050361CS000000

50

16

1’

379x759

0.128

15

LS PV 80

S5080361CS000000

80

16

1’

453x789

0.170

15

LS PV 100

S5100361CS000000

100

16

1’

453x915

0.200

15

LS PV 200

S5200461CS000000

200

16

1’1/2

556x1218

0.407

8

LS PV 300**

S5300461CS0CE000

300

14

1’1/2

626x1373

0.596

6

LS PV 500**

S5500461CS0CE000

500

12

1’1/2

777x1457

1.300

1

LS PV 750***

S5750461CS000000

750

16

1’1/2

786x1925

2

1

LS PV 1000***

S5N10H61CS000000

1000

16

2’

933x1912

2.200

1

 

Available version with s/s flange
22 bar upon request
** 16 bar available not marked ce
*** Not marked ce

 

 

 

 


 

 

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