English
6
Wilo AG 09/2005
1.6.3 Safety action
This is a summary of conditions and actions to
prevent injury to personnel and damage to the
environment and to equipment.
NEVER DO MAINTENANCE WORK WHEN THE
UNIT IS CONNECTED TO POWER
GUARDS MUST NOT BE REMOVED WHILE THE
PUMP IS OPERATIONAL
DRAIN THE PUMP AND ISOLATE PIPEWORK
BEFORE DISMANTLING THE PUMP
The appropriate safety precautions should be
taken where the pumped liquids are hazardous.
HANDLING COMPONENTS
Many precision parts have sharp corners and the
wearing of appropriate safety gloves and equip-
ment is required when handling these compon-
ents. To lift heavy pieces above 25 kg (55 lb) use
a crane appropriate for the mass and in accor-
dance with current local regulations.
THERMAL SHOCK
Rapid changes in the temperature of the liquid
within the pump can cause thermal shock, which
can result in damage or breakage of components
and should be avoided.
NEVER APPLY HEAT TO REMOVE IMPELLER
Trapped lubricant or vapour could cause an
explosion.
HOT (and cold) PARTS
If hot or freezing components or auxiliary hea-
ting supplies can present a danger to operators
and persons entering the immediate area action
must be taken to avoid accidental contact. If
complete protection is not possible, the
machine access must be limited to maintenance
staff only, with clear visual warnings and indica-
tors to those entering the immediate area. Note:
bearing housings must not be insulated and
drive motors and bearings may be hot.
If the temperature is greater than 68 °C (175 °F)
or below 5 °C (20 °F) in a restricted zone, or
exceeds local regulations, action as above shall
be taken.
HAZARDOUS LIQUIDS
When the pump is handling hazardous liquids
care must be taken to avoid exposure to the
liquid by appropriate sitting of the pump, limi-
ting personnel access and by operator training.
If the liquid is flammable and/or explosive, strict
safety procedures must be applied.
Gland packing must not be used when pumping
hazardous liquids.
1.7
Noise level
When pump noise level exceeds 85-dBA attention
must be given to prevailing Health and Safety
Legislation, to limit the exposure of plant opera-
ting personnel to the noise. The usual approach is
to control exposure time to the noise or to enclose
the machine to reduce emitted sound. You may
have already specified a limiting noise level when
the equipment was ordered, however if no noise
requirements were defined then machines above
a certain power level will exceed 85 dBA. In such
situations consideration must be given to the fit-
ting of an acoustic enclosure to meet local regula-
tions.
Pump noise level is dependent on a number of
factors - the type of motor fitted, the operating
capacity, pipework design and acoustic characte-
ristics of the building.
The figures in the table below are indicative only,
PREVENT EXCESSIVE EXTERNAL PIPE
LOAD
Do not use pump as a support for piping.
Do not mount expansion joints, so that
their force, due to internal pressure, acts
on the pump flange.
ENSURE CORRECT LUBRICATION
(See section 5, Commissioning, startup,
operation and shutdown.)
START THE PUMP WITH OUTLET VALVE
PARTLY OPENED
(Unless otherwise instructed at a speci-
fic point in the User Instructions.)
This is recommended to minimize the
risk of overloading and damaging the
pump motor at full or zero flow. Pumps
may be started with the valve further
open only on installations where this
situation cannot occur. The pump outlet
control valve may need to be adjusted to
comply with the duty following the run-
up process. (See section 5, Commissio-
ning start-up, operation and shutdown.)
NEVER RUN THE PUMP DRY
INLET VALVES TO BE FULLY OPEN WHEN
PUMP IS RUNNING
Running the pump at zero flow or below
the recommended minimum flow conti-
nuously will cause damage to the seal.
DO NOT RUN THE PUMP AT ABNOR-
MALLY HIGH OR LOW FLOW RATES
Operating at a flow rate higher than nor-
mal or at a flow rate with no backpres-
sure on the pump may overload the
motor and cause cavitations. Low flow
rates may cause a reduction in pump/
bearing life, overheating of the pump,
instability and cavitations/vibration.
CAUTION!
CAUTION!
CAUTION!
CAUTION!
CAUTION!
CAUTION!
