The Sound Level Of The Pump Unit; Influences; Maximum Temperature; Jacket Options - Johnson Pump TG GS2-25 Instruction Manual

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 –L
1 2
L[f(L –L )]
1 2
L = L
total 1
where L
For more than two values this method can be repeated.
Example:
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:
Material:
18
0 1 2 3 4 5
3.0 2.5 2.0 1.7 1.4 1.2
+ L
corrected
: the total sound level of the pump unit
total
L : the highest sound level
1
L : the lowest sound level
2
L : term, depending on the difference between both sound levels
corrected
Drive unit
Pump
Correction
According to the table : L
10 bar
Cast iron GG25
6
1.0
: L = 79 dB(A)
1
: L = 75 dB(A)
2
: L - L = 4 dB(A)
1 2
= 1.4 dB(A)
corrected
L = 79 + 1.4 = 80.4 dB(A)
total
A.0500.501 – IM-TGGS/05.01 EN (03/2013)