RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 6
BP HUB FACE * DISC PACK CLAMP BOLT
SERIES SPACING BOLT TORQUE TORQUE DRY
SIZE in. mm ft-lb Nm ft-lb Nm
BP48 4.88 124 40 54 41 56
BP53 5.88 150 60 81 65 88
BP58 6.00 152 120 163 100 136
BP58 6.69 170 120 163 100 136
BP63 7.00 179 120 163 100 136
* Max total indicator reading .003 in. or .076 mm for all sizes.
All rotating power transmission equipment is potentially dangerous. Ensure that the couplings are
properly guarded prior to turning on the power. Coupling guards are provided with the equipment
and must be in place and secured properly while the equipment is in operation.
SERIES 52 COUPLING DATA TABLE
SERIES 52 COUPLING – The Thomas Series 52 coupling is
also used on applications above 600 HP. It has two drive hubs,
a center spool, and disc packs which are bolted between the
center spool and each drive hub. A center spool and two flex-
ible steel disc packs serve as the drive element. These three
parts, situated between the motor and compressor hubs,
prevent axial end float between the motor and compressor
shafts. End float tends to occur with sleeve bearing motors.
The magnetic center of the sleeve bearing motors must be
determined and maintained by securing the coupling hub to
the motor shaft with the shaft properly located.
Injury may occur if loose clothing,
etc. becomes entangled on the
spinning motor shaft.
If the motor is coupled to the compressor using a fixed-end-
play coupling such as the Series 52 coupling and the motor
is not properly centered, the additional thrust loads will be
transmitted to the compressor bearings. This additional thrust
could result in premature bearing failure. Install as follows:
1. Before proceeding with the alignment process, following
this section, disassemble the Series 52 coupling noting the
arrangement of bolts, washers, and nuts as THEY MUST
BE REPLACED IN THE SAME ORDER. Mark the adjoining
bolt holes of each part, the two hubs, the two disc packs,
and the center spool, so they are put back together in the
same position.
2. Mount the coupling hubs on their respective shafts. The
hub is bored for an interference fit on the shaft. Heating of
the coupling hub may be necessary for assembly. DO NOT
SPOT HEAT THE HUB as it may cause distortion. Heat in
water, oil, or use a SOFT open flame and quickly position
on the shaft.
3. Adjust the distance between hub faces, as specified in the
Series 52 Coupling Data Table, by sliding the hubs. Key and
secure the hubs to the shafts by tightening the set screws.
4. Reassemble the coupling with the disc packs and the
center spool. Ensure that they are reassembled exactly as
they were disassembled.
WOODS BP SERIES COUPLING – is also used on applica-
tions above 600 HP. It utilizes a center spool and two flexible
steel disc packs as the drive element. These three parts,
situated between the motor and compressor hubs, prevent
axial end float between the motor and compressor shafts.
End float tends to occur with sleeve bearing motors.
Injury may occur if loose clothing,
etc. becomes entangled on the
spinning motor shaft.
If the motor is coupled to the compressor using a fixed-end-
play coupling and the motor is not properly centered, the
additional thrust loads will be transmitted to the compressor
bearings. This additional thrust could result in premature
bearing failure. Install the BP Series coupling using the fol-
lowing instructions:
1. Before proceeding with the alignment process, following
this section, disassemble the BP Series coupling noting
the arrangement of bolts, washers, and nuts as THEY
MUST BE REPLACED IN THE SAME ORDER. Mark the
adjoining bolt holes of each part, the two hubs, the two disc
packs, and the center spool, so they are put back together
in the same position.
2. Slide the coupling hubs on their respective shafts.
3. Reassemble the coupling with the disc packs and the
center spool. Ensure that they are reassembled exactly
as they were disassembled. Torque disc pack hardware to
specification in BP Series Coupling Data Table.
4. Key and secure the hubs to the shafts by tightening the
clamping bolts. Make sure that the keyways are offset 180
O
to maintain balance.
5. Torque the clamping bolts of both hubs to the torque value
given in the Data Table. DO NOT USE ANY LUBRICANT
ON THESE BOLTS.
6. Proceed to Coupling Alignment.
BP SERIES COUPLING DATA TABLE
225 5 127.0 1/32 .914 .004 .102 .004 .102 25 34.0
262 5 127.0 1/32 .914 .004 .102 .004 .102 30 40.7
312 5-1/2 139.7 3/64 1.295 .004 .102 .004 .102 40 54.2
350 6 152.4 3/64 1.295 .004 .102 .004 .102 95 128.8
375 7 177.8 1/16 1.574 .004 .102 .004 .102 130 176.3
425 7 177.8 1/16 1.574 .004 .102 .004 .102 175 237.3
450 8 203.2 1/16 1.574 .004 .102 .004 .102 200 271.2
500 9 228.6 5/64 2.083 .004 .102 .004 .102 260 352.5
COUP- HUB FACE MAX TOTAL INDICATOR READING CLAMP BOLT
LING SPACING +/- ANGULAR PARALLEL TORQUE (LUBE)
SIZE in. mm in. mm in. mm in. mm ft-lb Nm
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