Design and Construction Handbook - Los Angeles World Airports

Guide Specification
1. Utilize bare stable springs without restraints.
2. Provide spring with diameter not less than 80% of loaded operating height of spring.
3. Design ends of spring so that they remain parallel during and after springs are loaded to
their minimum specified deflections.
4. Provide springs with 50% travel from operating deflection before reaching solid height.
5. Provide spring mounts with 1/4 inch thick waffled neoprene acoustical pad bonded to
underside of base plate.
H. Provide resiliently mounted equipment bases raised to operating height with a minimum of 2
inch of clearance at bottom of base prior to installing equipment.
1. Temporarily support bases on 2-inch thick (minimum) spacer blocks.
2. Adjust mountings to transfer load from spacer blocks to mountings; remove spacer blocks
after equipment installation, but immediately prior to operation.
I. Concrete inertia blocks with adequate reinforcing steel will be provided under General
Construction Work.
J. Neoprene-In-Shear Isolation Rails: Furnish for horizontal pumps, air compressors, and
vacuum pumps when supplied with fractional horsepower motors.
1. Provide top structural iron channel rails with tapped holes to accept machinery
foundation bolts supported by properly loaded and located double deflection neoprene-inshear
mountings, equal to Type DNR - M.I.I.
2. Provide mountings with 3/8 inch minimum static deflection and bolt holes for anchoring
onto foundation equal to Type DNR - M.I.I.
K. Neoprene-In-Shear Supported Concrete Inertia Bases: Provide for horizontal pumps, jockey
pumps, air compressors, and vacuum pumps when supplied with one horsepower to three
horsepower motors.
L. Provide a minimum 6-inch thick concrete inertia block supported by double deflection
neoprene-in-shear mountings, equal to Type ND - M.I.I., with form as noted for foundations.
Bolt and grout equipment to concrete base. Provide minimum static deflection of 1 inch.
M. Spring-Supported, Factory-Fabricated Inertia Bases: Provide for horizontal pumps (except
fire pumps), bottom-supported vertical booster pumps, jockey pumps, rotary air compressors
and vacuum pumps with five horsepower and larger motors.
1. Provide concrete inertia block with factory-fabricated steel structural perimeter frame, set
on roofing paper, with equipment anchor bolt templates and mounting brackets supplied
by vibration control manufacturer.
2. Provide and locate under brackets, spring supports with a minimum static deflection of 1
inch and with leveling device to raise entire isolation base 2 inch above foundation.
3. Provide minimum thickness required for concrete inertia bases as follows:
a. Motor Size 5 hp to 15 hp: 6 inch.
b. Motor Size 20 hp to 50 hp: 8 inch.
c. Motor Size 60 hp to 100 hp: 10 inch.
d. Motor Size Over 100 hp: 12 inch.
HANGERS AND SUPPORTS FOR PLUMBING AND EQUIPMENT
22 05 29 - 14 Plumbing Systems