11
3.1
ALIGNMENT OF COMPRESSOR COUPLINGS (Continued)
If the gap is checked with the couplings “hard together”, ie, in the normal running condition, it should
be equal to the required coupling gap: 3.175mm (0.125”).
NOTE:
If a “limited float” coupling is used with an electric motor whose shaft has no thrust bearing,
the gap must be correct with the motor shaft on its magnetic centre. In this instance the
facial alignment check should be made, rotating the driven half coupling only as the drive
(motor) half coupling is not located axially, or preferably by a “double-clock” method, which
avoids the problem of repeated axial position.
3.2
ALIGNMENT TOLERANCE
The maximum acceptable line-up tolerance for couplings on compressor installations is as follows:
RADIAL TOLERANCE
FACE TOLERANCE
Application
A. Motor to Gearbox or Compressor ie couplings operating up to 3,600 rpm
Radial Tolerance
Face Tolerance
0.15mm (0.006”) TIR
TIR 0.005mm/cm
or 0.005”/in Dia. Of coupling
B. Gearbox to Compressor i.e. couplings operating above 3,600 rpm
Radial Tolerance
Face Tolerance
0
.10mm (0.004”) TIR
TIR 0.005mm/cm or
0.005”/inch Dia. Of coupling
Radial Tolerance
Eccentricity = ½ TIR on circumference
TIR denotes Total Indicator Reading obtained by Clockgauge
Summary of Contents for WRV
Page 1: ...WRV WRVi COMPRESSOR RANGE SERVICE MANUAL...
Page 3: ...2 SECTION 1 FOREWORD...
Page 5: ...4 HOWDEN SECTION 2 DESCRIPTION...
Page 10: ...9 SECTION 3 INSTALLATION...
Page 14: ...13 SECTION 4 FIRST START UP...
Page 16: ...15 SECTION 5 NORMAL OPERATION...
Page 18: ...17 SECTION 6 PROCEDURES DURING SHUTDOWN...
Page 20: ...19 SECTION 7 MAINTENANCE...
Page 33: ...32 SECTION 8 OVERHAUL...
Page 50: ...49 SECTION 9 SPECIAL INSTRUCTIONS...
Page 57: ...56 SECTION 10 SPARES...
Page 64: ...63 Printed in the UK Issue HCL September 2012 Howden Compressors Limited...