COUPLINGS TYPE
TSK – TSP – TSA – TSC - TLK
Fitting, Operating and Maintenance Instructions
No. G-001-E-A
General Specification
The ranges of Metastream couplings covered by this manual, are designed to transmit torque
between the rotating shafts of a driving and driven machine, whilst accomodating the inevitable
lateral, angular and axial misalignment, which will exist between two coupled machines.
The usual extent of supply comprises:
•
a hub for the DRIVING machine (motor) shaft
•
a hub for the DRIVEN machine shaft
•
a factory assembled transmission unit, comprising two packs of flexible metallic discs, each
bolted to a “guard ring” and to a common spacer (distance piece), which separates the two disc
packs, The overall length of the transmission unit is sized to suit the shaft end separation of the
coupled machines
•
a set of fasteners to assemble the transmission unit to the two hub flanges.
IMPORTANT
These instructions should be read in conjunction with any application specific general arrangement
drawing which may be supplied with the coupling.
Selection verification
Although a coupling may be correctly specified at the time of order placement, the duty conditions
can sometimes change prior to the coupling being put into service. Information is available from
John Crane to advise on the selection and limitations of their power transmission products, but the
USER is ultimately responsible for verifying the suitability of the selection for the actual service
conditions.
The coupling and its manner of use must conform to any legal or licensing requirements, and, where
appropriate, meet local health and safety requirements.
IMPORTANT
: If the conditions of operations are changed without approval from John Crane, then
we would decline responsibility for any consequent damage and the USER would assume all risks.
Documentation supplied with the coupling should be retained for future reference.
Unpacking and Storage
The coupling should be unpacked and examined for any signs of transit damage. Particular attention
should be paid to hub bores and spigot/recess local diameters.
If the coupling is not to be used immediately, it should be re-packed and stored in a dry place away from
direct heat.
Documentation supplied with the coupling should be retained for future reference.
Installation
Prior to installing the coupling ensure that the machinery is made safe
•
Remove the coupling from its packaging and carefully inspect for signs of damage. Particular attention
should be paid to the hub bores and the spigot/recess location features, which should be free from
burrs and other damage.
•
Fit the Driver (1) and Driven (2) hubs to the corresponding machine shafts. Normally, John Crane
supply parallel bored and keywayed hubs, individually machined to give a light interference fit with the
associated shaft. If it is necessary to apply some heating to the hub to assist fitting, then a warm oil
bath will usually be adequate.
Hubs must be adequately supported during installation to avoid accidental damage should
they slip.
It is usual to install the hub such that the hub face and shaft end are flush, but consult the arrangement
drawing, or other particular instructions, to check the configuration for individual designs.
Align the centre lines of the driving and driven machine shafts as follows:
•
With one machine firmly bolted down, set the distance between shaft ends (DBSE) according to
drawing or catalogue dimension ‘A’
IMPORTANT: DBSE is usually measured between the inner face of the hubs and should not be
taken as the length of the transmission unit at its maximum diameter
•
Align the shaft centre lines both horizontally and vertically by aligning the hub flanges. The John Crane
coupling alignment kit and reverse periphery procedure allows rapid and accurate alignment of shafts.
IMPORTANT: The misalignment tolerances quoted in literature and on drawings allow for dynamic
conditions and variations. For the best service from the coupling, John Crane recommend that
installed misalignment is no more than 10% of the maximum allowable misalignment, allowance being
made for any anticipated movements which will occur during operation (eg. thermal movements on
hut pumps
).
•
Check spigot and recess locations on the hubs and transmission unit for burrs or other signs of damage
and then fit the transmission unit (3) between the hubs.
THE TRANSMISSION UNIT MUST BE ADEQUATELY SUPPORTED DURING INSTALLATION
TO AVOID ACCIDENTAL DAMAGE SHOULD IT SLIP
.
It may be necessary to compress the transmission unit whilst sliding it between the hubs, and facilities are
provided to make it easier:
1.
on smaller units, lever slots are provided in the hub flanges
2.
on larger units, including the TLK, the spacer flanges are drilled so
that the hub bolts (4) may be used to compress the transmission unit
sufficiently to clear the spigot location (see sketch).
Maximum compression of the gap ‘X’ should not exceed 0.8 times the
coupling maximum axial misalignement value, unless indicated
otherwise on the general arrangement drawing.
IMPORTANT: Always remove the compression bolts as soon as the transmission unit is in position
and before fully tightening the hub bolts.
Fit the hub bolts (4) (and locking washers (5) if supplied) and tighten these evenly to locate the transmission
unit, ensuring that the spigots enter their recess squarely. Bolts should be tightened in a “diametrically
opposite” sequence to the values quoted in Table 1. If a general arrangement drawing is supplied with the
coupling, then torque values quoted on that drawing take precedence.
•
Rotate the machinery two or three times slowly to ensure it moves freely.
The coupling is now ready for continuous and trouble free service
.
John Crane Italia SpA
Via Giotto 3
20053 Muggiò (MI)
Tel. 039-2714.1
Fax 039-2714.300
Operation
BEFORE STARTING THE MACHINERY, ENSURE THAT ALL NECESSARY SAFETY
PROCEDURES ARE BEING OBSERVED
When operated within the duty conditions for which they were designed, John Crane Metastream
flexible disc couplings will give long and trouble free service. Routine examination should include
a periodic check on the tightness of fasteners and visual inspection of transmission components
for signs of fatigue or wear.
If the coupled machinery is disturbed at any time, then shaft alignment should be re-checked as a
matter of routine. Alignment checking is also recommended if a deterioration of installation
alignment during service is suspected.
Inspection and Maintenance
MAINTENANCE WORK MUST ONLY BE CARRIED OUT BY SUITABLY QUALIFIED
PERSONNEL WHEN THE EQUIPMENT IS STATIONARY AND HAS BEEN MADE SAFE
John Crane Metastream flexible power transmission couplings are designed to give long and
trouble free service if operated within the conditions for which they were specified. Failures are
rare and can generally be attributed to:-
•
excessive misalignment
•
severe torsional overload
In all cases of coupling failure, the cause should be identified and corrected before replacing the
coupling.
The usual mode of failure of flexible disc couplings is rupture of the flexing membranes. In such
circumstances, it is possible to repair the coupling by fitting a replacement disc pack assembly.
ATTENTION: When repairing John Crane Metastream flexible disc couplings, only John
Crane approved parts should be used.
•
To replace the transmission unit (3), first remove the hub bolts (4) and then withdraw the
transmission unit using the lever slots in the hubs or compression bolt feature in the spacer as
appropriate.
TRANSMISSION UNIT MUST BE ADEQUATELY SUPPORTED DURING REMOVAL
TO AVOID ACCIDENTAL DAMAGE SHOULD IT SLIP
•
Identify the bolts which connect the disc packs to the spacer piece. Slacken and remove
these drive bolts (3C) and nuts (3D) and carefully dismantle the disc pack assemblies from
the spacer piece. Do not attempt to dismantle the disc pack assemblies any further;
replacement disc packs are always supplied complete with a new guard ring.
•
Subsequent refurbishment is dependent on the type of coupling involved and the precise
configuration of the replacement membrane pack. It is recommended that BOTH membrane
packs be replaced, as failure of one inevitably results in some damage to the other.
TSP (TSA) REPLACEMENT PACK
•
Complete the removal of the old disc pack assemblies by pressing the washers (3E) out of the
holes in each spacer flange.
•
Identify the fasteners which attach the disc packs to the spacer. Disassemble the loosely
assembled nuts (3D) and separate the bolts (3C) and washers (3E).
•
Fit new washers (3E) into the spacer.
•
Carefully press the protruding sleeves in each disc pack into the holes in the spacer flange,
taking care not to over-strain the flexible discs. Insert the drive bolts (3C) from the guard ring
side and secure using the locknuts (3D). Tighten the locknuts evenly to the correct SPACER
BOLT tightening torque value given in Table 1.
•
Complete the refurbishment of the transmission unit by replacing the second disc pack
assembly.
