SECTION 15242

VIBRATION ISOLATION

PART 1 GENERAL

WORK INCLUDED

Inertia bases.

Vibration isolation.

RELATED WORK

Section [_____ - __________:] [__________] fire protection system.

Section [_____ - __________:] [__________] plumbing system.

Section [_____ - __________:] [__________] HVAC system.

REFERENCES

ASHRAE - Guide to Average Noise Criteria Curves.

QUALITY ASSURANCE

Maintain ASHRAE criteria for average noise criteria curves for all equipment at full load condition.

SUBMITTALS

Submit shop drawings and product data under provisions of Section [01300.] [01340.]

Indicate inertia bases on shop drawings.

Indicate vibration isolator locations, with static and dynamic load on each, on shop drawings and described on product data.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

CERTIFICATES

Submit manufacturer's certificate under provisions of Section [01400] [01405] that isolators are properly installed and properly adjusted to meet or exceed [specified requirements.] [_______________.]

PART 2 PRODUCTS

ACCEPTABLE MANUFACTURERS

[__________________________________________.]

[__________________________________________.]

[__________________________________________.]

Substitutions: Under provisions of Section [01600.] [01630.]

INERTIA BASES

Type A: Integral structural steel fan and motor base with motor slide rails.

Type B: Slung structural steel base with gussetted brackets.

Type C: Reinforced 3,000 psi (20 mPa) concrete base set in full depth perimeter structural steel channel frame, with gussetted brackets and anchor bolts.

Type D: Reinforced 3,000 psi (20 mPa) concrete base with chamfered edges, without channel frame.

VIBRATION ISOLATORS

Type 1: Closed spring mount with top and bottom housing separated with neoprene rubber stabilizers.

Type 2: Open spring mount with stiff springs (horizontal stiffness equal to vertical stiffness).

Type 3: Open spring mount with stiff springs, heavy mounting frame, and limit stop.

Type 4: Closed spring mount with stiff springs and limit stop.

Type 5: Closed spring hanger with acoustic washer.

Type 6: Closed spring hanger with one inch (25 mm) thick acoustic isolator.

Type 7: Elastomer mount with threaded insert and hold down holes.

Type 8: Neoprene jacketed pre-compressed molded glass fiber.

Type 9: Rubber waffle pads, 30 durometer, minimum 1/2 inch (13 mm) thick, maximum loading 40 psi (275 kPa). Use neoprene in oily or exterior locations.

Type 10: 1/2 inch (13 mm) thick rubber waffle pads bonded each side of 1/4 inch (6 mm) thick steel plate.

FABRICATION

Provide pairs of neoprene side snubbers or restraining springs where side torque or thrust may develop.

Color code spring mounts.

Select springs to operate at 2/3 maximum compression strain, with 1/4 inch (6 mm) ribbed neoprene pads.

PART 3 EXECUTION

INSTALLATION

Install vibration isolators for motor driven equipment.

Set steel bases for one inch (25 mm) clearance between housekeeping pad and base. Set concrete inertia bases for 2 inch (50 mm) clearance. Adjust equipment level.

Provide spring isolators on piping connected to isolated equipment as follows: Up to 4 inch (100 mm) diameter, first three points of support; 5 to 8 inch (125 to 200 mm) diameter, first four points of support; 10 inch (250 mm) diameter and over, first six points of support. Static deflection of first point shall be twice deflection of isolated equipment.

SCHEDULE

ISOLATED_EQUIPMENT	BASE	ISOLATOR

Type Thickness Type Thickness

END OF SECTION