Spencer 4BOB Multistage Centrifugal Blowers - Manual (Page 3)

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These Spencer blowers are multistage centrifugal units which
handle air and other gases, working either as blowers or
exhausters. They increase the pressure of the incoming air or
gas by guiding it from one stage to the next through diffusers.
They are centrifugal because the flow through the blower is
turned perpendicular to the axis of rotation.
The most prevalent Spencer blower configuration is the stan-
dard overhung type which has all the impellers mounted directly
on an extended motor shaft.
The four-bearing overhung blower uses a standard shaft motor
and an overhung impeller design. The rotating blower assembly
is supported by a rigid ball bearing bracket and shaft, which is
connected to the motor via a flexible coupling.
In four-bearing outboard blowers, the impellers are mounted on
a shaft supported between two outboard bearings and driven by
a standard shaft motor through a flexible coupling.
IIII.. LLiim miitteedd W Waarrrraannttyy
We warrant that this product will be free from defects in material
and workmanship for a period of 18 months from date of ship-
ment or 12 months from date of startup, whichever comes first.
Within the warranty period, we shall repair or replace, F.O.B.
our Factory, such products that are determined by us to be
defective.
This warranty will not apply to any product which has been sub-
jected to misuse, negligence or accident, or misapplied or
improperly installed. This warranty will not apply to any product
which has been disassembled, repaired or otherwise altered by
any persons not authorized by the Spencer Service Department.
The guarantees of the motor, control and component manufac-
turers govern the extent of our guarantee on such equipment.
Warranty work on motors, controls and components must be
authorized by Spencer and must be performed in an authorized
shop as designated by the motor, control and component man-
ufacturers. The Spencer Turbine Company reserves the right to
invoice all expenses incurred when repairs are made in the field
at the specific request of a customer. For complete warranty
information, refer to Form 706, “Spencer's Terms and Conditions
of Sales.”
IIllll.. SSaaffeettyy PPrreeccaauuttiioonnss
aanndd O Oppeerraattiinngg
G Guuiiddeelliinneess
• Read and follow all instructions in this manual. If you have
any questions, consult your Spencer Representative.
• Use appropriately rated lifting equipment for installation,
removal or disassembly of heavy components.
• Remove inlet and discharge covers, silica gel bags and crat-
ing materials prior to blower installation.
• Inspect all openings for tools and foreign matter before con-
necting accessories or piping.
• Perform all installing and operating procedures with care,
following sound practices to avoid accidents and damage.
• Avoid climbing on or over the blower; use proper staging and
ladders for exterior machine access.
• Be sure isolation pads are placed beneath the blower. See
page 4.
• Install flexible connectors on inlet and discharge flanges to
isolate piping loads from the blower.
• Ensure that piping, machine guards and accessories such as
filters or valves are properly installed and fastened.
• Install a filter on the inlet when the blower is used in pressure
service and keep it clean.
• Allow only qualified electricians to work on electrical equipment.
• Lock electrical circuits open and tag them during servicing of
equipment.
• Align the coupling as instructed on page 5 (4BOH and 4BOB
blowers only). Then remove alignment tools and replace
coupling guard before restarting blower.
• Turn the blower shaft by hand to verify free rotation without
rubbing or noise.
• Check motor rotation as instructed on page 7.
• Do not operate the blower where there is an ambient temper-
ature above 104°F (40°C), unless it has been designed for
such conditions.
• Operate blower with sufficient restriction at all times (via con-
nected piping system or throttled butterfly valve) to avoid
motor overloading.
• Do not allow blower operation in surge (unstable low flow) or
damage may result.
• Rotate shaft of stored or inactive blowers a few times by
hand every week.
• Use only genuine Spencer parts for repairs and service.
33
Standard Overhung Design