minimum 80 percent of the vertical (axial) stiffness. For machine-attached
and floor-attached restraining elements, separate from metal-to-metal
contact by neoprene cushions 3 mm 1/8 inch thick minimum. Provide neoprene
acoustic friction pads at least 6 mm 1/4 inch thick.
2.4.1
Springs
Provide springs with base and compression plates, to keep spring ends
parallel during and after deflection to operating height. Provide outside
coil diameters at least 0.8 of the operating height. At operating height,
springs shall have additional travel to complete (solid) compression equal
to at least 50 percent of the operating deflection.
2.4.2
Mounting and Adjustment
Provide base and compression plates with mounting holes or threaded
fittings. Bolt leveling adjustment bolts to machinery or base.
2.5
SUSPENSION ISOLATORS
Provide hangers with suspension isolators encased in open steel brackets.
Isolate hanger rods from isolator steel brackets with neoprene-lined
opening.
2.5.1
Suspension Neoprene Isolators
Provide double-deflection elements with minimum 10 mm 3/8 inch deflection.
2.5.2
Suspension Spring Isolators
Provide hangers with springs and molded neoprene elements in series.
Provide isolators with adjustable spring-preloading devices where required
to maintain constant pipe elevations during installation and when pipe
operational loads are transferred to the springs.
2.6
[MACHINERY BASES] [, PLATFORMS] [, RAILS] [SADDLES]
ASTM A 36/A 36M and AISC 350.
2.7
INERTIA BASES
ASTM A 36/A 36M steel, ASTM C 94 ([20 MPa][2,500 psi] [_____]) concrete.
2.8
FLEXIBLE CONNECTORS FOR PIPING
Straight or elbow flexible connectors rated for temperatures, pressures,
and fluids to be conveyed. Provide flexible connectors with the strength 4
times operating pressure at highest system operating temperature. Provide
elbow flexible connectors with a permanently set angle.
2.8.1
Elastomeric Flexible Connectors
Fabricated of multiple plies of tire cord fabric and elastomeric materials
with integral reinforced elastomeric flanges with galvanized malleable iron
back up rings.
2.8.2
Metal Flexible Connectors
Fabricated of Grade E phosphor bronze, monel or corrugated stainless steel
SECTION 15070N
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