HYDAC International QHP Instrucciones De Servicio página 4

Piston Accumulators perform at their
most efficient in the vertical position with
the gas valve uppermost.
Mounting should take into account any
possibility of loading which may be
caused by adverse weather or seismic
events.
Accumulators should be mounted to
eliminate any movement in the event of
system pipework rupture or to create
abnormal stresses on the system
pipework.
Accumulators should be protected from
damage by vehicles or traffic, e.g. fork lift
trucks.
It will be necessary to check the gas
pre-charge pressure at regular intervals
(see 5. Maintenance) Consideration must
therefore be given to following:
- The provision of a safety valve block or
- isolation valve between the accumulator
- and the fluid pressure line to enable
- isolation of the fluid pressure.
- Location of the accumulator gas valve
GB
- with regard to accidental damage and
- fitting of pre-charging equipment.
- Provision and location of an additional
- warning label stating "pre-charge with
- nitrogen gas at ...bar".
QHP are able to provide a
comprehensive range of mounting
clamps and brackets, safety blocks or
isolation valves, burst discs. Contact our
Sales Department for details
4
4. Commissioning
Important
All accumulators are supplied without
nitrogen pre-charge unless a pre-charge
pressure is specified with the order. Prior
to commissioning all accumulators must
be pre-charged with nitrogen..
WARNING: Never use oxygen or
air – this could cause an explosion! Only
use oxygen free dry nitrogen gas N2
(99.995%).
WARNING: Check the
accumulator label or marking to ensure
that the maximum working pressure of
the accumulator is equal to or greater
that the system working pressure.
Always use a nitrogen regulator valve
when the maximum working pressure of
the accumulator is lower than the gas
pressure in the nitrogen cylinder.
The pre-charge pressure is dependent on
the operating conditions. For advice
contact our Technical Department.