General
All EPE accumulators are carefully inspected and tested at
the factory and are exactly as designated by the code
printed on the name plate.
In addition the name plate carries the accumulators serial
number and if specified on order, the value on precharge.
On the accumulator shell are also marked :
Manufacturer's serial number & date shell manufactured;
identification mark; design standard applicable; maximum
recommended working pressure; temperature range;
capacity in liters.
Accumulators are normally supplied empty (uncharged).
Nitrogen precharged units can be supplied on request.
ATTENTION: The max working pressure marked on the
accumulator must be
≥
that the calibrated pressure of the
relief valve.
Before undertaking any work on the hydraulic circuit for
mounting an accumulator, it is required to release the
pressure completely.
Test certificates if required are supplied with the
accumulator, or forwarded by mail.
Installation
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 above the gas-fill valve.
POSITION is possible from vertical one (gas valve on top)
to the horizontal one.
The manufacturers name plate stating initial pressure must
remain visible.
Access to vent screw must be kept unobstructed.
MOUNTING 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-fill 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.
CONNECTION adopters 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.
To guarantee trouble free operation, the following points
should be observed:
Ÿ
A non-return valve to be fitted between pump and
accumulator to prevent reversal.
Ÿ
A relief valve must be fitted close to the accumulator
and set at lower than the max. working pressure
marked on the accumulator shell.
Ÿ
A shut-off valve and a dump valve are recommended
to enable periodic checks or removals during normal
operation. EPE safety blocks
Type B
incorporate all
the essential functions.
Preliminary Checking
Upon receipt check:
That there has been no damage in transit.
The identification code is as ordered.
Before installation it is most important to ensure that the
gas pressure corresponds to the desired value.
The initial gas pressure must be selected to meet the
service requirement.
In general the design values are as follows:
P0 = 0.9 P1, ( energy reserve, line shock absorber, etc.)
P0 = 0.6 - 0.7 P1 ( pulsation damper )
Gas precharge pressure is of crucial importance to the
correct functions of the accumulator and the durability of
the bladder.
The gas pressure, when the accumulator is supplied pre-
charged is related to the temperature of 20°C.
In the case of accumulators supplied without pre-loading
pressure, or after repair work it is necessary to perform
inflation with nitrogen; must also be performed also the
verification of the system by using the equipment type-
PC following procedure - Checking & Charging - page-20.
Operation & Maintenance
Clamp
Supporting
Ring
Bracket
19
Fig.14
