BLACKMER NGH1013, Installation, Operation And Maintenance Instructions

Page: 8 / 32

INSTALLATION
CB6A-210 page 8/32
COMPRESSOR DRIVE SYSTEMS
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous
machinery can
cause serious
personal injury.
Flywheel guard contact with moving
parts may be a source
of ignition in explosive atmospheres
causing severe personal injury or death
Hazardous gases
can cause property
damage, personal
injury or death
Operation without guards in place can
cause serious personal injury, major
property damage or death.
Hazardous
machinery can
cause serious
personal injury.
FLYWHEELS
Blackmer compressors are fitted with flywheels which
MUST be used for belt drive applications. Two types of
flywheels are available, a low speed for compressors
running at 1150 RPM and below and high speed for
compressor running up to 1800 RPM. Refer to Direct Drive
section if a v-belt and flywheel system is not being
implemented.
LOW SPEED FLYWHEELS – 1150 RPM MAX
Low Speed Flywheels must be properly installed and
aligned:
1. Ensure that the mating surface between the hub and
flywheel are clean and dry – do not use a lubricant.
2. Install the hub and key on clean compressor shaft,
flange end first.
3. Tighten the hub setscrew just enough to prevent it from
sliding on the shaft – do not overtighten.
4. Place the flywheel on the hub and loosely thread the
capscrews with lock washers into the assembly. Do
not use lubricant on the capscrews.
5. Tighten all capscrews evenly and progressively in
rotation to the torque value in Table 3. There must be
a gap between the hub flange and the flywheel with
installation is complete.
Do not over-torque. Do not
attempt to close gap between hub flange and
flywheel.
Hub
Size Capscrew
Size
Torque
ft-lbs. (Nm)
SF 3/8 – 16 30 (40.7)
E (std) 1/2 - 13 60 (81)
F 9/16 – 12 75 (101)
Table 3 – Flywheel Hub Torque Values
6. Ensure that the radial and axial runout values at the
rim do not exceed the following values:
Radial O.D. Runout: 0.016 in. (0.4046 mm)
Axial Rim Runout: 0.021 in. (0.5334 mm)
7. Ensure that the compressor flywheel guard is properly
installed before operation. The guard must not contact
moving parts.
HIGH SPEED FLYWHEELS – 1800 RPM MAX
High Speed Flywheels must be properly installed and
aligned:
1. Ensure that the mating surface between the
flywheel clamp hub and crankshaft are clean and
dry – do not use a lubricant.
2. Install the key and flywheel on the compressor
shaft. The flywheel bore is a machined to size
clamp hub.
3. Tighten clamp hub bolts to specified torque of 188
ft*lbs (254.9 Nm)
4. Flywheel is two plane dynamically balanced but
verify Radial O.D. Runout and Axial Rim Runout is
equal to or less than: 0.010 in (0.127 mm)
V-BELT DRIVES
Most Blackmer compressors are driven via V-belts which
must be properly designed, aligned, and tensioned.
1. Lay a straight edge along the face of the motor sheave
and compressor flywheel.
2. Adjust either as needed to provide alignment.
3. Tighten the V-belts such that they are taut, but not
overly tight. Consult your V-belt supplier for specific
values. It is recommended that a belt tension meter or
sonic meter be used during tensioning for the most
accurate results.
4. Check the belt tension after 24 - 48 hours run-in.
Recheck the tension periodically, and tighten the
belts as required.
Caution should be used to avoid overtightening belts,
which can shorten bearing and belt life. Belts should be
inspected periodically for signs of excessive wear and
replaced if necessary.