| 1.0 |
General
Information |
| 1.1 |
All
accumulators are carefully inspected and tested
before shipment. In addition the nameplate
carries the accumulator model number, part
number, size, and maximum working pressure. |
| 1.2 |
The
accumulators are normally supplied empty but
charged units are available on request |
| 1.3 |
ATTENTION: The maximum working pressure
marked on the nameplate must be  than the
calibrated pressure of the relief valve. |
| 1.4 |
Before
undertaking any work (repairs, replacement, etc.)
on a hydraulic circuit mounting an accumulator,
it is advised to completely release the liquid
pressure.
|
| 2.0 |
Preliminary
Checking |
| 2.1 |
On
accumulator arrival check:
- That there has been no
damage in transit
- That the accumulator
dimensions were as specified
|
| 2.2 |
Before
installation it is most important to ensure that
the gas pressure corresponds to the desired
value. The initial gas pressure is of crucial
importance to the correct functions of the
accumulator and the durability of the bladder. |
| 2.3 |
The
gas pressure, when the accumulator is supplied
pre-charged, is related to a temperature of 20° C. In
the case of accumulators supplied without
pre-loading pressure, it is very important to
fill the accumulator with Nitrogen. Air or oxygen
may cause an explosion.
|
| 3.0 |
Installation |
| 3.1 |
To
achieve a high degree of efficiency, the
accumulator should be fitted as close as possible
to the installation it serves. The space
necessary for testing and filling equipment is at
least 150mm around the gas-fill valve. |
| 3.2 |
Position: The accumulator should stand
either a vertical or horizontal position. The
nameplate stating the initial pressure must
remain visible and access to the vent screw must
be kept unobstructed. |
| 3.3 |
Mounting: Mounting should be done by means
of clamps, brackets, and rubber support rings.
The Mounting must be such that should a rupture
occur on the pipe system at the liquid
connection, or should the gas-filled valve break,
the accumulator cannot be pulled from its
mounting by the forces involved. No welding or
other mechanical process must be carried out on
the accumulator shell for the purpose of
attaching fastenings. |
| 3.4 |
Connections: Adapters and flanges are available
on request. When fitting screws, reducers, or the
safety and shut-off block, care must be taken
that the accumulator is held firmly by means of a
spanner at the liquid valve, so that the liquid
valve is not turned independently of the
accumulator body. |
| 3.5 |
To
guarantee trouble free operation, the following
points should be observed:
- A non-return valve to
be fitted between the pump and the
accumulator to prevent reversal.
- The installation
relief valve should be fitted directly to
the accumulator, after the non-return
valve, and calibrated lower than the
working pressure marked on the nameplate.
- A shut-off valve and a
dump valve are recommended to enable
periodic checks or removals during normal
operations.
|
| 4.0 |
Initial
Operating |
| 4.1 |
Before
the system is pressurized it must be bled. For
this, the vent screw in the connection fitting
has to be eased until fluid emerges. |
| 4.2 |
Then
retighten the gas valve locknut carefully. The
system is charged with maximum pressure so seals
and connections should be checked.
|
| 5.0 |
Periodic
Checks |
| 5.1 |
After
the installation of a new unit or following
repairs, the initial pressure must be tested as
follows:
- At least once during
the first week so that any gas losses can
be immediately observed and remedied.
- Check for any gas
losses approximately three months after
installation.
- Check for any gas
losses approximately six months after
installation.
|
| 5.2 |
It
is recommended that heavy-duty applications
should be checked every month to insure attention
to problems before they cause great damage. |
This Document For
Future Reference