18
A.0500.501 – IM-TGGS/05.01 EN (03/2013)
3.7.2 The sound level of the pump unit
The sound level of the drive (motor, transmission, . . .) must be added to the sound level of the pump
itself to determine the total sound level of the pump unit. The sum of several sound levels must be
calculated logarithmically.
For a quick determination of the total sound level the following table can be used:
L
1
–L
2
0
1
2
3
4
5
6
L[f(L
1
–L
2
)]
3.0
2.5
2.0 1.7 1.4 1.2 1.0
L
total
= L
1
+ L
corrected
where L
total
: the total sound level of the pump unit
L
1
: the highest sound level
L
2
: the lowest sound level
L
corrected
: term, depending on the difference between both sound levels
For more than two values this method can be repeated.
Example:
Drive unit
: L
1
= 79 dB(A)
Pump
: L
2
= 75 dB(A)
Correction
: L
1
- L
2
= 4 dB(A)
According to the table : L
corrected
= 1.4 dB(A)
L
total
= 79 + 1.4 = 80.4 dB(A)
3.7.3 Influences
The real sound level of the pump unit can for several reasons deviate from the values listed in the
tables above.
• Noise production decreases when pumping high viscosity liquids due to better lubricating and
damping properties. Moreover the resistance torque of the idler is increasing due to higher liquid
friction which results in lower vibration amplitude.
• Noise production increases when pumping low viscosity liquids combined with low working
pressure because the idler can move freely (lower charge, lower liquid friction) and the liquid
does not damp much.
• Vibrations in piping, vibrating of the baseplate etc. will make the installation produce more noise.
3.8 Maximum temperature
Overall temperature of TopGear GS pumps is 200°C. The temperature is limited because of the
position of the roller bearing close to the pump. Higher temperature could be a problem for grease
lubrication and life time of these bearing.
3.9 Jacket options
S-jackets
are designed for use with saturated steam or with non-dangerous media. They are
provided with cylindrical threaded connections according to ISO 228-I.
Maximum temperature: 200°C
Maximum pressure:
10 bar
Material:
Cast iron GG25
