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Technical data

Recommended Vibration Isolation Grade Table/Vibration Isolation Grade Diagram/Vibration Isolation Grade Chart

1.Vibration isolation

The Vibration Isolation Grade estimates shown in Table 1 are determined based on the type of equipment installed

Table 1: Vibration Isolation Grade Table (estimated values)

Building structure Machine
installation
locations
Allowable noise
from vibration
in rooms near
machinery rooms
Installed
equipment
Reciprocating
freezers
Screw-type
freezers
Pumps Air
blowers
Air
conditioners
Cooling
towers
Less than
19kW
19kW
or more
Less than
60kW
60kW
or more
More than
2.2kW
More than
15kW
More than
19kW
#2
More than
1/2
#5
More than
1/2
More than
#6
Less than
10,000m
3/h
10,000m
3/hor more
Less than
100RT
100RT
or more
Steel structure Intermediate
and top floors
VL<45
NC<25
Studio
VL<50
NC<35
High-grade rooms
Reception room
VL<55
NC<40
Conference room
VL<55
NC<45
Office
Dining hall
Lobby
VL<60
NC<50
Parking lots
Reinforced
concrete
construction
VL<45
NC<25
Studio  
VL<45
NC<25
High-grade rooms
Reception room
VL<55
NC<40
Conference room
VL<55
NC<45
Office
Dining hall
Lobby
VL<60
NC<50
Parking lots
Ground floors VL<40
NC<25
Studio
VL<55
NC<45
Office
VL<60
NC<50
Parking lots
Notes
  • (1) I, II, III, and IV show the vibration isolation grade; * indicates that vibration-isolating equipment is not necessary.
  • (2) For blank fields, solid sound insulation is to be considered separately.
  • (3) VL indicates the vibration tolerance level (the dB level calculated by correcting the vibration acceleration level (VAL) to account for human sensitivity).

2.List of vibration isolation products

Table 3: Vibration Isolation Grade Table by Vibration-Isolating Materials

The characteristics and Vibration Isolation Grade chart of representative vibration-isolating materials from Tables 1 and 3 are shown in Figure 1.

3.Vibration Isolation Grade

I, II, III, IV, and V shown in Figure 1 are the Vibration Isolation Grades in Table 3.

Vibration Isolation Grade Vibration Isolation Grade、Vibration transmission rate

4.Vibration-isolating performance

The vibration transmission rates of the vibration isolation products shown in 2 are as follows.

(1) List of vibration transmission rates for placement-type products

Vibration-isolating performance
Equipment frequency
(rpm)
Vibration transmission rateτ
Product models
TS-3 TS-1・TSU TSM DP
300 0.565 4.789 1.562 1.285
350 0.361 1.550 1.959 1.426
600 0.099 0.261 2.277 3.461
1000 0.034 0.081 0.334 0.696
2000 0.008 0.019 0.067 0.151
3000 0.004 0.008 0.029 0.080
Equipment frequency
(rpm)
Vibration-isolating performance ranking
Product models
TS-3 TS-1・TSU TSM DP
300 1 4 3 2
350 1 3 4 2
600 1 2 3 4
1000 1 2 3 4
1500 1 2 3 4
3000 1 2 3 4

:Vibration-isolating materials available for selection

The applicable product models based on the above vibration transmission rates are shown below

Equipment frequency
(rpm)
Product models
TS-3 TS-1・TSU TSM DP
300
350
600
1000
1500
3000
  • ○ :Applicable vibration-isolating materials
  • ▲ :Not applicable

(2)List of vibration transmission rates for hanger type products

防振性能について
Equipment frequency
(rpm)
Vibration transmission rateτ
Product models
JSH・JS・TSH PTH(S) PTH(W)
500 0.425 1.818 2.684
750 0.153 2.437 0.833
1000 0.081 0.989 0.409
1500 0.034 0.362 0.192

Vibration-isolating performance ranking
Product models
JSH・JS・TSH PTH(S) PTH(W)
500 1 2 3
750 1 3 2
1000 1 3 2
1500 1 2 1

:Vibration-isolating materials available for selection

The applicable product models based on the above vibration transmission rates are shown below

Equipment frequency
(rpm)
Product models
JSH・JS・TSH PTH(S) PTH(W)
500
750
1000
1500
  • ○ :Applicable vibration-isolating materials
  • ▲ :Not applicable

5.Sample reference documents for vibration isolating

Cross-section diagrams and plan diagrams for vibration isolating are shown below.
The below figure shows sample results of positional evaluations.

Sample reference documents for vibration isolating1 Sample reference documents for vibration isolating2
Vibration acceleration level1 Vibration acceleration level1

List of evaluation results

As shown in the above position diagram, when outdoor units are installed on the roof and indoor units are installed on the reference floor, and a typical office is at the evaluation point, the standard as shown at number 7 is Dimple Pads on the outdoor units and spring suspension vibration-isolating materials on the indoor units.