TABLE 3B. (Cont.) - 15070N0051

Tabke 3B. Class II Vibration Isolator Types and Minimum Static Deflection (MSD, mm) for basements below grade and floor slabs on earth

TABLE 3B. (Cont.) - 15070N0052

15070N
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TABLE 3B

Class II Vibration Isolator Types and Minimum Static Deflection

(MSD, mm) for basements below grade and floor slabs on earth

Equipment

Type (Note (1))

MSD

Floor Mounted

8.89

High-Pressure Fans

HR recommended for minimizing

(Over 1494 Pa

undesirable thrust effects

Static Pressure)

and Other

Machines

Producing Thrust

(Note (2))

Internal Combustion

Engines and Engine

Driven Equip

750 rpm and over

25.40

Dimmer Banks and

Transformers

Up to 454 kg

6.35

8.89

Over 454 kg

25.40

NOTES:

Note (1) and Note (2) are same as for TABLE 3A.

TABLE 3B

Class II Vibration Isolator Types and Minimum Static Deflection

(MSD, inches) for basements below grade and floor slabs on earth

Equipment

Type (Note (1))

MSD

Absorption Refrigeration

0.25

Machines

0.35

Centrifugal Chillers

or Heat Pumps

Hermetic Type

0.25

0.35

Open Type

NM-I

0.35

Reciprocating Air or

Refrigeration Compressors

500 to 750 rpm

1.0

751 rpm and up

1.0

Reciprocating Chillers

SECTION 15070N

Page 51

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