Spencer 4BOB Multistage Centrifugal Blowers - Manual (Page 7)

77
88.. SShhaafftt SSeeaallss ((44BBO OBB BBlloowweerrss && G Gaass
BBoooosstteerrss))
Shaft seals at both the inlet and discharge ends minimize leakage
of gas into or out of the blower. Packing boxes are standard for
4BOB blowers. Packing boxes, carbon ring seals and mechanical
seals may be used on gas boosters. Consult Spencer Form DD
or applicable manufacturerʼs instructions.
99.. M Moottoorr RRoottaattiioonn
The motor must be wired correctly to rotate the blower in the
right direction. A rotation arrow is located on the blower housing.
“Bump” or jog the start button and observe the direction of rotation
of the motor shaft. This movement must agree with the rotation
arrow. If the rotation is incorrect, the motor wiring must be
changed.
This diagram shows the available discharge positions, viewed
from the intake end, and the direction of blower rotation associated
with each discharge position.
VVII.. O Oppeerraattiioonn aanndd
AAddjjuussttm meennttss
SSttaarrttuupp PPrreeccaauuttiioonnss
Before operating a new blower for the first time, review its
installation and setup to be sure that no steps have been over-
looked.
11.. IInnssttaallllaattiioonn CChheecckk LLiisstt
• Is there any damage from transportation or installation?
• Is the machine level?
• Have all packing, shipping materials and tools been removed?
• Is the inlet filter in place?
• Are isolation pads in place?
• Is the piping connected and supported?
• Are flexible connectors in place between blower and piping?
• Are safety guards in place?
22.. AAddjjuussttm meenntt CChheecckkss
• Is the coupling aligned within tolerances and lubricated?
(4BOB & 4BOH blowers only)
33.. O Oppeerraattiioonnaall CChheecckkss
• Is the throttling valve closed or properly positioned?
• Do the blower shaft and driver spin freely?
• Is the isolation valve (if any) open?
• Is the system ready for air or gas delivery?
• Has motor rotation been checked?
• Are motor and electrical accessories properly wired?
• Is the control panel energized?
• Have maintenance and operations personnel been notified?
CCAAUUTTIIO ONN:: TThhiiss bblloowweerr m muusstt hhaavvee aaddeeqquuaattee ssyysstteem m rreessiiss--
ttaannccee aatt aallll ttiim meess ttoo aavvooiidd ooppeerraattiioonn aatt oorr nneeaarr ffrreeee ddeelliivveerryy
((wwiiddee ooppeenn)).. IItt iiss ttyyppiiccaallllyy iim mppoosseedd bbyy tthhee pprroocceessss aanndd
ssuupppplleem meenntteedd wwiitthh aa tthhrroottttlliinngg vvaallvvee.. RRuunnnniinngg tthhee bblloowweerr
oovveerrllooaaddeedd wwiillll ddaam maaggee tthhee m moottoorr..
BBlloowweerr SSttaarrttuupp
With the system connected and the throttling valve closed, turn
the blower on. Quickly assess the current draw of the motor.
Adjust the system load or throttling valve until the desired flow
is reached, being careful not to operate in surge or to exceed
the full-rated motor capacity. Initially, blowers will temporarily
develop more differential pressure and take more power. Check
final settings after operating temperature is achieved, typically
after one-half hour. If the throttling valve is not fully open when
the motor capacity has been reached, it should be fixed at this
point to prevent further opening and possible overloading of the
motor.
Packing Box Carbon Ring
Mechanical Seal