PB3 User Instruction
Page 7 of 39
HOT (and cold) PARTS
If hot or freezing components or auxiliary heating 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 indicators to those
entering the immediate are. Note/; bearing housings must not be insulated and drive
motors and bearings may be hot.
If the temperature is greater than 68 °C (154°F) or below -5 °C (20 °F) in a restricted
zone, or exceeds local regulations, action as above shall be taken.
1.5.4 Products used in potentially explosive atmospheres
explosive atmosphere
Measures are required to:
-
Avoid excessive temperature
-
Prevent the buildup of explosive mixtures
-
Prevent the generation of sparks
-
Prevent leakages
-
Maintain the pump to avoid hazard
The following instru
c
tions for pumps and pump units when installed in potentially explosive atmospheres must
be followed to help ensure explosion protection.
Both electrical and non-electrical equipment must meet the requirements of European Directive 94/9/EC.
1.6 Noise level
Attention must be given to the exposure of personnel to the noise, and local legislation will define when
guidance to personnel on noise limitation is required, and when noise exposure reduction is mandatory.
This is
typically
80
to 85 dBA.
The usual approach is to
control the
exposure time to the noise or to enclose the machine to reduce emitted
sound. Pump noise level is dependent on a number of operational factors, flow rate, pipe work design and
acoustic characteristics of the building, and so the values given are subject to a 3 dBA tolerance and cannot be
guaranteed.
1.6.1 Overall noise level
Tables below show dBA levels for two stage and three or more stage pumps, based on the best efficiency point
BEP at design RPM and required impeller diameter.
For specific gravities less than 1.0, use 1.0 specific gravity. For specific gravities above 1.0, use the actual
specific gravity.
When the required condition flow falls outside the range of 75% to 125% of BEP, a Part Load Correction (PLC)
must be added to the noise levels as follows:
