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The accumulator must be vented on the oil side prior to
commissioning.
Before beginning pre-charge:
NOTE: Most accumulators are shipped with minimal gas
pressure. The user is responsible for determining the proper
pre-charge level and ensuring that correct pressure is
maintained at all times. Pre-charge should equal 30% to 80%
of the maximum system pressure, depending on the function
of the accumulator. Contact Accumulators, Inc. sales if you are
unsure of the accumulator's function.
It is recommended that a genuine Accumulators, Inc.
Charging and Gauging Assembly be used:
•
3000 psi: AI-CG3-3KT-SS (see photo C)
•
4000-6000 psi: AI-CG6-6KT-SS (see photo D)
•
10000 psi: AI-CG10-10KT-SS
For special applications, contact Accumulators, Inc.
PRECHARGING INSTRUCTIONS
If accumulator is not yet installed:
The accumulator is fully lubricated at the factory and
shipped with piston at fluid end.
1. Remove the gas valve guard and valve cap. DO NOT
REMOVE THE GAS VALVE.
VENTING
GAS N
2
FLUID
VENT HERE
2. Attach the gland and nut portion of the charging assembly
(AI-CG3-3KT-SS for 3000 psi accumulators, AI-CG6-6KT-
SS for 4000 psi and higher) to a dry nitrogen gas bottle and
tighten securely, see photo A. NOTE: If the gland and nut do
not fit, the wrong gas or wrong pressure is being used.
3a. For 3000 psi accumulators: Rotate "T" handle CCW so it is
all the way out before attaching air chuck. Attach the air chuck
to the accumulator gas valve by hand, tightening its swivel
hex connection, see photo B. Tighten with a hand wrench if
loose. Rotate T handle CW to open valve core.
3b. For 4000 psi and higher accumulators: Open the valve
by turning its top 3/4" hex nut counter-clockwise. Make
sure not to loosen the lower 3/4" hex nut.
4a. If using a nitrogen gas regulator, temporarily set it to 35
psig and open the nitrogen gas valve, then set the regulator
to the desired psig level.
4b. If you are NOT using a nitrogen gas regulator, care should
be taken to slowly open the valve. The use of a nitrogen gas
regulator is strongly recommended since the valve can be
opened fully using a regulator set to 35 psig.
5. Continue pre-charging to desired pressure by increasing
gas flow slowly. Gas will adjust to ambient temperature
following pre-charge. Recheck pressure after 15 minutes.
6a. For 3000 psi accumulators: Turn the air chuck "T" handle
CCW until it stops, closing the valve core.
6b. For 4000 psi and higher: close the gas valve by turning
its top 3/4" hex nut CW. IF NO GAS VALVE, consult factory.
6c. Open bleed valve to release trapped nitrogen.
7. Remove the charging assembly from the accumulator.
8a. Check for gas leakage. (The use of gas leak detection
fluid or soapy water is recommended). Put the valve cap on if
pressure stays constant after 30 minutes. If not, repeat steps
1-7. When pressure is constant, install valve cap and gas valve
guard.
8b. Install the accumulator on the system. Check for
leaks. Hydraulically pressurize the system, operate the
accumulator, and re-check for leaks.
If accumulator already installed, turn off power to the system
and make sure all fluid pressure is released prior to pre-
charge.
Perform steps 1-8 of precharging instructions.
PRECHARGE MAINTENANCE
•
For cycling applications, check the pre-charge weekly.
•
For non-cycling applications, check monthly.
•
Some gas will be lost over time due to permeation.
•
Rapid loss may indicate a gas valve or seal problem.
Release system fluid pressure, not the gas pre-charge.
Perform steps 1-8 of precharging instructions.