Commissioning; Gas Pre-Charge Pressure; Max. Operating Temperature; Testing Prior To Operation - Freudenberg 49313466 Manual De Instrucciones

4.

Commissioning

4.1.

Gas pre-charge pressure

Accumulators are generally supplied ready for operation. The pre-charge pressure (p
specified on the accumulators housing.
checked by the operator and the accumulator is to be filled, if necessary.
4.2. Fill Gas
Accumulators must be filled only with nitrogen class 4.0, i.e. N
pressure should be chosen between 0,9...0,95 of the lower operating pressure (P
temperature and below 130 bar. Furthermore the ratio of gas precharge pressure and upper
operating pressure (P
The pre-charge pressure changes with the gas temperature. The pre-charge pressure
P0 indicated on the nameplate, on drawings or in other documents applies to nitrogen
with a gas temperature of 20°C. After filling or draining nitrogen, the actual pressure
can only be correctly adjusted to its specified value after a sufficient temperature
compensation period.
4.3.

Max. operating temperature

Freudenberg accumulators are suitable for operating temperatures of between -10°C and 80°C.
(or see information on page 3,5 and chart on page 6) Please enquire for other temperatures.
When used with more suitable diaphragm and vessel materials there are variant temperature
ranges e.g. –40°C up to +80°C possible.
4.4

Testing prior to operation

Both testing prior to operation and recurring tests are to be carried out in accordance with
national regulations. All lines and connections are to be particularly checked for functionality
and replaced in the case of a fault.

4.5 Filling of refillable accumulators

A filling and testing device must be used for filling the accumulator. Observe the filling device
operating instructions. Freudenberg supplies suitable filling and testing devices.
The pre-charge pressure changes with the gas temperature. After filling or releasing
nitrogen, it is necessary to wait until the temperature has levelled before checking the
gas pressure.
CAUTION: Maintenance and repair of the accumulator may only be carried out by
trained specialist.
Before Commissioning, the pre-charge pressure must be
:P ) should not be higher than 1:6...1:8.
0 2
99.9 vol. %. The precharge
2
) at operating
1
) is
0
15