BLACOH Fluid Control
4
Installation Notes
Dampening of flow pulsations can only be effective if a minimum of 5 to 10 psi (0.4 to 0.7 bar) back pressure
downstream of dampener is available. A BLACOH back pressure valve may be required downstream of
dampener, except when dampener is used as an inlet stabilizer for the inlet side of the pump.
It is recommended that a BLACOH pressure relief valve be installed in all pump systems to ensure compliance
with pressure limits on system equipment.
To avoid possible damage to bladder/bellows from a system pressure test:
Adjustable and Chargeable models
— charge dampener to 80% of the system test pressure prior to test.
Automatic model
— prior to test, dampener must be equipped with a constant source of compressed air with
pressure equal to or greater than system test pressure.
Inlet Stabilizer model
— maximum pressure test 30 psi (2.0 bar), charge to 20 psi (1.3 bar) for system pressure
test.
Install dampener in-line as close to the pump discharge/inlet or quick closing valve as possible. Dampener
installation should be no more than ten pipe diameters from pump discharge/inlet or quick closing valve.
It is recommended that an isolation valve be installed between the dampener and system piping.
ATEX Standard
Certain models made for the European market comply with the ATEX standard for use in potentially explosive
atmospheres. These models have the AT designation at the end of the part number and comply with EC standard
EN-13463-5 with protection degree of II 2GD TXC. AT models have a grounding lug and must be grounded
(earthed) before operation.
Maintenance
Remove all pressure from dampener AND pumping system before disassembly, removal or maintenance.
Dampeners require very little maintenance. There is only ONE wear part – the elastomeric bladder or the PTFE bellows.
There is no need for lubrication.
Elastomeric bladder replacement should be part of a preventive maintenance program. Dampeners used in conjunction with
diaphragm pumps should have the bladders replaced at least every second time the diaphragms in the pump are replaced.
As with any pumping system, wear is dependent on many factors including material, temperature, chemicals, fluid
abrasiveness and system design. This suggested maintenance program may need to be adjusted according to specific
applications.
Periodic inspection of the dampener and fasteners should be conducted to visually check for signs of over-pressurization,
fatigue, stress or corrosion. Body housings and fasteners must be replaced at first indication of deterioration.
CAUTION! Replace nut and bolt fasteners at each re-assembly with fasteners of equal grade/strength
value. DO NOT re-use old nuts and bolts.
After the initial torque of fasteners, bolts may lose strength when re-torqued. Failure to replace both nuts and bolts upon
each vessel reassembly will void the product warranty given by the manufacturer and the manufacturer will have no liability
whatsoever for any vessel failure or malfunction.
Where dampeners are used in corrosive environments, nut and bolt fasteners should be regularly inspected and replaced
with nut and bolt fasteners of equal grade/strength value if corrosion is observed. Failure to conduct such regular inspections
and replacement will void the product warranty given by the manufacturer and the manufacturer will have no liability
whatsoever for any vessel failure or malfunction.
IMPORTANT!
After maintenance or re-assembly, use new fasteners and torque fasteners according to
specification on dampener serial tag. If tag is missing, consult distributor or factory for specifications.
DO NOT
use dampener if the fasteners (nuts and bolts) are corroded. Check for fastener corrosion frequently,
especially in atmospheres containing salt or corrosive chemicals, or if dampener leakage has occurred.
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