How to choose suitable vibration isolators for rooftop chillers, refrigeration and air handling units?

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The characteristics:

  • Weight: light – heavy – very heavy
  • Disturbing frequency: low – medium – high
  • Mounting: standing

Find below our tables of Damping efficiency upon disturbing frequency

vibration isolators for rooftop chillers, refrigeration and air handling units

Walraven VibraTek® selection matrix:

  • 2802010000

    Walraven VibraTek® MS-2X Spring Mount

    • recommended for equipment with low working speeds, from 600 rpm and above
    • epoxy powder-coated base, caps and springs provide increased resistance to corrosion
    • flexible internal filler prevents debris and solid elements entering and damaging the spring under load

    For more information

  • 2801200400

    Walraven VibraTek® PR-T Rubber Tile Pad

    • ideal for use as an elastic isolating support for equipment and metal structures
    • individual 50x50mm pieces can be easily cut to form required support shape
    • transforms to elastic base support when used with a hexagon head screw

    For more information

  • 2800504000

    Walraven VibraTek® MS-4 Spring Mount

    • recommended for equipment with low working speeds, from 600 rpm and above
    • epoxy powder-coated base, caps and springs provide increased resistance to corrosion
    • flexible internal filler prevents debris and solid elements entering and damaging the spring under load

    For more information

  • 2801800240

    Walraven VibraTek® MR-B Rubber Mount

    • recommended for machinery with working speeds above 2500 RPM, providing a degree of vibration insulation from 75% to 80%
    • ideally suited for machinery with radial vibration (as opposed to axial) and prone to sudden or pronounced starts and stops)
    • metal and rubber parts can be separated for recycling

    For more information

  • 2800101000

    Walraven VibraTek® MR-L 1000/M8 Rubber Levelling Mount

    • recommended for machinery with working speeds above 2500 RPM, providing a degree of vibration insulation from 75% to 80%
    • simple to install and does not need to be fixed to the supporting structure
    • rubber isolator with DIN 934 nuts and DIN 9012 washers included in delivery for mounting and levelling equipment

    For more information

  • 2800103000

    Walraven VibraTek® MR-L 3000/M10 Rubber Levelling Mount

    • recommended for machinery with working speeds above 2500 RPM, providing a degree of vibration insulation from 75% to 80%
    • simple to install and does not need to be fixed to the supporting structure
    • rubber isolator with DIN 934 nuts and DIN 9012 washers included in delivery for mounting and levelling equipment

    For more information

  • 2800105000

    Walraven VibraTek® MR-L 5000/M12 Rubber Levelling Mount

    • recommended for machinery with working speeds above 2500 RPM, providing a degree of vibration insulation from 75% to 80%
    • simple to install and does not need to be fixed to the supporting structure
    • rubber isolator with DIN 934 nuts and DIN 9012 washers included in delivery for mounting and levelling equipment

    For more information

  • 2800108000

    Walraven VibraTek® MR-L 8000/M16 Rubber Levelling Mount

    • recommended for machinery with working speeds above 2500 RPM, providing a degree of vibration insulation from 75% to 80%
    • simple to install and does not need to be fixed to the supporting structure
    • rubber isolator with DIN 934 nuts and DIN 9012 washers included in delivery for mounting and levelling equipment

    For more information

How to evaluate the suitability of an isolator?

walraven vibratek how to redt the tables

How to read the tables?

Example: the load per one vibro-isolator is 280 kg, and the operating frequency of the device is 2300 rpm. See the 5 steps to read from the table (as shown in the attached diagram) to find out if the selected vibro-isolator meets the damping conditions and is well-matched.

The motor’s speed (rpm) causes vibrations (Hz) in HVAC devices. To simplify product selection, we’ve organized tables by speed, as it’s easily obtainable from suppliers.

  1. Select the weight of the device in the table – greater than or equal to 280 kg
  2. Horizontally to the left, you can see the product number of Walraven VibraTek®
  3. Horizontally to the right, you can read the deflection
  4. Locate the column with a frequency lower than 2300 rpm
  5. Read the damping performance at: cross-deflection and frequency

Damping efficiency upon disturbing frequency

Damping performance description

 

V[%] Damping performance description
99% excellent high requirements medium requirements regular requirements
93% perfect
88% very good
81% good
67% sufficient
20% mediocre low improvement or negative impact – contact Walraven Technical Support for alternative solution
0% nochange
resonance better without insulation

Walraven VibraTek® MS-M

Walraven VibraTek® MS-M
 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800200150 100 10 8,0 18,6% 78,7% 87,4% 91,6% 94,8% 97,1% 98,2%
150 15 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800200250 200 20 9,6 40,3% 82,9% 89,7% 93,1% 95,7% 97,6% 98,5%
250 25 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800200500 350 35 8,4 25,4% 80,0% 88,0% 92,0% 95,0% 97,3% 98,3%
500 50 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800200750 550 55 8,8 31,1% 81,0% 88,6% 92,4% 95,3% 97,4% 98,3%
600 60 9,6 40,3% 82,9% 89,7% 93,1% 95,7% 97,6% 98,5%
750 75 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%
2800201000 850 85 10,2 45,7% 84,1% 90,4% 93,5% 95,9% 97,8% 98,6%
1000 100 12,0 57,3% 86,8% 91,9% 94,5% 96,6% 98,1% 98,8%

Walraven VibraTek® MS-1

Walraven VibraTek® MS-1
 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800300050 25 2,5 11,5 54,6% 86,1% 91,5% 94,3% 96,4% 98,0% 98,7%
50 5 23,0 81,5% 93,5% 95,9% >97,2% 98,2% 99,0% 99,4%
2800300150 100 10 15,3 69,4% 89,9% 93,8% 95,8% 97,3% 98,5% 99,1%
150 15 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800300250 200 20 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
250 25 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800300500 300 30 13,8 64,8% 88,7% 93,0% 95,3% 97,0% 98,3% 98,9%
400 40 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
500 50 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800300750 600 60 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
750 75 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800301000 800 80 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
900 90 20,7 79,0% 92,7% 95,5% 96,9% 98,0% 98,9% 99,3%
1000 100 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%

Walraven VibraTek® MS-1X

Walraven VibraTek® MS-1X
 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800401250 1100 110 22,0 80,5% 93,2% 95,7% 97,1% 98,2% 99,0% 99,3%
1500 125 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2800401500 1400 140 23,3 81,8% 93,6% 96,0% 97,3% 98,3% 99,0% 99,4%
1500 150 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2800402000 1750 175 21,9 80,4% 93,1% 95,7% 97,1% 98,1% 99,0% 99,3%
2000 200 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2800403000 2200 220 18,3 75,6% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
2600 260 21,7 80,1% 93,1% 95,7% 97,0% 98,1% 99,0% 99,3%
3000 300 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2800404000 3500 350 21,9 80,4% 93,1% 95,7% 97,1% 98,1% 99,0% 99,3%
4000 400 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2800405000 4300 430 21,5 80,0% 93,0% 95,6% 97,0% 98,1% 98,9% 99,3%
4600 460 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
5000 500 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2800406000 5300 530 22,1 80,6% 93,2% 95,8% 97,1% 98,2% 99,0% 99,3%
5600 560 23,3 81,8% 93,6% 96,0% 97,3% 98,3% 99,0% 99,4%
6000 600 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%

Walraven VibraTek® MS-1X-CBL

Walraven VibraTek® MS-1X-CBL Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2801901000 800 80 20,0 78,1% 92,5% 95,3% 96,8% 98,0% 98,9% 99,3%
1000 100 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2801901250 1100 110 22,0 80,5% 93,2% 95,7% 97,1% 98,2% 99,0% 99,3%
1250 125 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2801901500 1400 140 23,3 81,8% 93,6% 96,0% 97,3% 98,3% 99,0% 99,4%
1500 150 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2801902000 1750 175 21,9 80,4% 93,1% 95,7% 97,1% 98,1% 99,0% 99,3%
2000 200 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2801903000 2200 220 18,3 75,6% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
2600 260 21,7 80,1% 93,1% 95,7% 97,0% 98,1% 99,0% 99,3%
3000 300 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2801904000 3500 350 21,9 80,4% 93,1% 95,7% 97,1% 98,1% 99,0% 99,3%
4000 400 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2801905000 4300 430 21,5 80,0% 93,0% 95,6% 97,0% 98,1% 98,9% 99,3%
4600 460 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
5000 500 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2801906000 5300 530 22,1 80,6% 93,2% 95,8% 97,1% 98,2% 99,0% 99,3%
5600 560 23,3 81,8% 93,6% 96,0% 97,3% 98,3% 99,0% 99,4%
6000 600 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%

Walraven VibraTek® MS-2X

Walraven VibraTek® MS-2X Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2802003000 2000 200 16,7 72,5% 90,8% 94,3% 96,1% 97,5% 98,6% 99,1%
3000 300 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2802004000 3500 350 21,9 80,4% 93,1% 95,7% 97,1% 98,1% 99,0% 99,3%
4000 400 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2802006000 5000 500 20,8 79,2% 92,8% 95,5% 96,9% 98,0% 98,9% 99,3%
6000 600 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2802008000 7000 700 21,9 80,4% 93,1% 95,7% 97,1% 98,1% 99,0% 99,3%
7500 750 23,4 81,9% 93,6% 96,0% 97,3% 98,3% 99,0% 99,4%
8000 800 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2802010000 9000 900 22,5 81,0% 93,4% 95,8% 97,2% 98,2% 99,0% 99,4%
10000 1000 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%
2802012000 11000 1100 22,9 81,4% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
11500 1150 24,0 82,4% 93,8% 96,1% 97,3% 98,3% 99,1% 99,4%
12000 1200 25,0 83,2% 94,1% 96,3% 97,4% 98,4% 99,1% 99,4%

Walraven VibraTek® MS-4

Walraven VibraTek® MS-4 Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2800501000 800 80 18,4 75,8% 91,7% 94,9% 96,5% 97,8% 98,8% 99,2%
1000 100 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800501500 1250 125 19,2 77,0% 92,1% 95,1% 96,6% 97,9% 98,8% 99,2%
1500 150 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800502000 1750 175 20,1 78,3% 92,5% 95,3% 96,8% 98,0% 98,9% 99,3%
2000 200 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800503000 2250 225 17,3 73,7% 91,2% 94,5% 96,3% 97,6% 98,7% 99,2%
2750 275 21,1 79,5% 92,9% 95,6% 97,0% 98,1% 98,9% 99,3%
3000 300 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800504000 3500 350 20,1 78,3% 92,5% 95,3% 96,8% 98,0% 98,9% 99,3%
4000 400 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%
2800505000 4250 425 19,6 77,5% 92,3% 95,2% 96,7% 97,9% 98,8% 99,3%
4750 475 21,9 80,3% 93,1% 95,7% 97,1% 98,1% 99,0% 99,3%
5000 500 23,0 81,5% 93,5% 95,9% 97,2% 98,2% 99,0% 99,4%

Walraven VibraTek® MR-B

Walraven VibraTek® MR-B Damping efficiency upon disturbing frequency
Article no.: load on vibroisolator deflection RPM 500 800 1000 1200 1500 2000 2500
[N] [~kg] [mm] Hz 8,3 13,3 16,7 20,0 25,0 33,3 41,7
2801800240 200 20 2,9 633,0% 7,4% 55,5% 72,8% 84,2% 91,7% 94,8%
240 24 3,5 4077,4% 33,1% 65,5% 78,3% 87,1% 93,1% 95,7%
2801800750 450 45 2,4 401,6% -40,6% 40,3% 64,9% 80,1% 89,7% 93,6%
750 75 4,0 -776,2% 46,0% 71,1% 81,5% 88,9% 94,1% 96,3%
2801801500 1000 100 3,7 -4599,3% 38,1% 67,6% 79,5% 87,8% 93,5% 95,9%
1500 150 5,5 -88,0% 65,8% 80,5% 87,2% 92,2% 95,7% 97,3%

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