5.3 SELECTION GUIDE FOR VIBRATION ISOLATORS
Table 5-1 Selection Guide for Vibration Isolators
EQUIPMENT
ON GRADE
20FT FLOOR SPAN
30FT FLOOR SPAN
40FT FLOOR SPAN
50FT FLOOR SPAN
BASE
ISOL
MIN
BASE
ISOL
MIN
BASE ISOL
MIN
BASE
ISOL
MIN
BASE
ISOL
MIN
TYPE
TYPE
DEFL
TYPE
TYPE DEFL TYPE TYPE
DEFL
TYPE
TYPE
DEFL
TYPE
TYPE
DEFL
REFRIGERATION MACHINES
ABSORPTION
---
D
---
---
SP
1.0
---
SP
1.0
---
SP
1.7
---
SP
1.7
PACKAGED HERMETIC
---
D
---
---
SP
1.0
---
SP
1.7
---
SP
1.7
R
SP
2.5
OPEN CENTRIFUGAL
B
D
---
B
SP
1.0
---
SP
1.7
B
SP
1.7
B
SP
3.5
RECIPROCATING:
500 - 750 RPM
---
D
---
---
SP
1.7
R
SP
1.7
R
SP
2.5
R
SP
3.5
751 RPM & OVER
---
D
---
---
SP
1.0
---
---
1.7
R
SP
2.5
R
SP
2.5
COMPRESSORS AND VACUUM PUMPS
UP THROUGH 1-1/2
---
D,L,
---
----
D,L,
---
---
D,L,
---
---
D,L,
---
---
D,L,
---
HP
W
W
W
W
W
2 HP AND OVER:
500 - 750 RPM
---
D
---
---
S
1.7
---
S
2.5
---
S
2.5
---
S
2.5
750 RPM & OVER
---
D
---
---
S
1.0
---
S
1.7
---
S
2.5
---
S
2.5
PUMPS
UP TO
---
---
---
---
D,L,
---
---
D,L,
---
---
D,L,
---
---
D,L,
---
1-1/2
W
W
W
W
CLOSE
HP
COUPLED
---
---
---
I
S
1.0
I
S
1.0
I
S
1.7
I
S
1.7
2 HP
&
OVER
5-4
HVAC DESIGN MANUAL
SUPPORT DATA
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