Cased Spring Mount (SMC)
Laterally stable steel springs housed in telescoping close-grain cast iron casing. Effective for isolation of high
and low frequency vibrations produced by floor mounted mechanical equipment, industrial machinery, piping.
- Springs have a deflection of 50mm at rated load
and are designed with 50% overload capacity, to
compensate for unexpected load variations and
to reduce operating stress.
- In compliance with ASHRAE guidelines, springs
are designed with a horizontal stiffness of at least
100% of the vertical stiffness, to ensure stability.This is achieved through high
ratios - 0.85 to 1.0 (as against
the minimum of 0.80 required by ASHRAE).
- Additional stability is provided by the casings of
SMC mounts, which are designed to eliminate
any chance of dislocation or toppling of springs
even when subjected to large lateral forces.
- All mounts have a built-in leveling arrangement,
capable of compensating for full static deflection.
- Inner walls of lower casing have resilient rubber
a) Limit lateral movement, particularly due to
start-up, shut-down and horizontal wind load.
b) Eliminate possibility of binding by providing a
smooth guide path for the top casing.
c) Prevent isolator short-circuiting by avoiding
metal to metal contact.
- Neoprene inserts below springs and 7 - 10mm
thick ribbed base pad act as noise breaks for
high frequencies in the audible range, which can
otherwise get transmitted to building structure.
- Neoprene inserts below springs, an exclusive
WEICCO feature, form a second line of defense
against noise transmission when the base pad is
short-circuited due to bolting down of the mount.
- Frictional base pad eliminates need for bolting
down in most applications.
- Color coded springs to facilitate identification.
- Springs and casings have epoxy powder coated
finish, rated to withstand 1000 hours of salt spray
testing as per test method ASTM B117.
SMC series mounts are suitable for installation under
all types of equipment. Since the springs are laterally
restrained in cased mounts, they are particularly
recommended for outdoor installations subject to wind
pressure and under equipment likely to generate
Application examples include: Chillers, AHUs, Pumps,
Centrifugal / Axial fans, Condensing Units, Packaged
Units, Reciprocating Compressors, DG Sets, Punch
Presses, Drop Hammers, Pipe Support points located
within mechanical equipment rooms, on rooftops and in
other noise-critical areas of the building.
- Mounts with external leveling arrangement supplied
as standard. These offer maximum convenience of
installation and leveling. Bolt passes through locating
holes of equipment. Suitable for most applications.
- Mounts with internal leveling arrangement and extra
neoprene acoustic friction pad on top (add suffix 'IR').
Used when accessibility for external leveling is
limited or under flat surfaces without locating holes.
Spring mount cartons contain detailed installation guide.
Compliance - Springs designed according to
BS 1726 (Part 1): 1987 and recommendations
made by SAE (US) and ASHRAE