English
Installation and maintenance instructions Wilo-Horizontal pumps
NP
G
they are subject to a +3 dB tolerance, and cannot
be guaranteed.
The values are based on the noisiest ungeared
electric motors which are likely to be encountered.
They represent Sound Pressure Levels at 1 m
(3.3 ft) from the directly driven pump, for "free
field over a reflecting plane".
If a pump only has been purchased, for fitting with
your own driver, then the "pump only" noise levels
from the table should be combined with the level
for the driver obtained from the supplier. If the
motor is driven by an inverter, it may show an
increase in noise level at some speeds. Consult a
Noise Specialist for the combined calculation.
In areas where the staff has to intervene, remem-
ber that when the level of the sound pressure is:
Below 70 dBA:
It is not necessary to take special precautions.
Above 70 dBA:
People working continuously in the machine room
must be supplied with protective devices against
noise.
Below 85 dBA :
No particular measures need to be taken for casual
visitors staying in the room during a limited period.
Above 85 dBA:
The room must be considered as a dangerous area
because of the noise and a warning sign must be
fixed at each entry warning the people coming
into the room, even for a short period, that they
must wear hearing protection.
Above 105 dBA:
Special hearing protection adapted to this noise
level and to the spectral noise components must
be installed and a warning sign to this effect erec-
ted at each entry. The staff in the room must
wear ear protection.
Make sure that the noise, which travels through
the walls and windows, does not generate too
high noise levels in the machine room's surroun-
dings.
2 Transport and storage
2.1
Consignment receipt and unpacking
Immediately after receipt of the equipment it
must be checked against the delivery and shipping
documents for its completeness and that there
has been no damage in transportation.
Any shortage and or damage must be reported
immediately and received in writing within one
month of receipt of the equipment. Later claims
cannot be accepted.
Check any crate, boxes and wrappings for any
accessories or spare parts that may be packed
separately with the equipment or attached to
Typical sound pressure level,
dBA, L
pA
at 1 m reference 20
P
Pa
(L
wA
sound power1 pW where L
pA
> 85 dBA)
Motor size and speed
3550 r/min
2900 r/min
1750 r/min
1450 r/min
Pump and
motor
Pump
only
Pump and
motor
Pump
only
Pump and
motor
Pump
only
Pump and
motor
Pump
only
kW (hp)
dBA
dBA
dBA
dBA
dBA
dBA
dBA
dBA
<0.55 (<0.75)
71
66
64
62
64
62
63
62
0.75 (1)
74
66
67
62
67
62
63
62
1.1 (1.5)
74
68
67
64
67
64
65
64
1.5 (2)
77
70
70
66
70
66
66
66
2.2 (3)
78
72
71
68
71
68
68
68
3 (4)
81
74
74
70
74
70
70
70
4 (5)
82
75
75
71
75
71
71
71
5.5 (7.5)
90 (99)
77
83
73
76
73
72
71
7.5 (10)
90 (99)
78
83
74
77
74
73
72
11 (15)
91 (100)
80
84
76
78
76
74
73
15 (20)
92 (101)
83
85 (94)
79
80
79
76
75
18.5 (25)
92 (101)
83
85 (94)
79
80
79
76
75
22 (30)
92 (101)
83
85 (94)
79
81
79
77
75
30 (40)
100 (109)
85 (94)
93 (102)
81
84
80
80
76
37 (50)
100 (109)
86 (95)
93 (102)
82
84
80
80
76
45 (60)
100 (109)
87 (96)
93 (102)
83
84
80
80
76
55 (75)
100 (109)
88 (97)
95 (104)
84
86 (95)
81
82
77
75 (100)
100 (109)
90 (99)
95 (104)
86 (95)
88 (97)
81
83
78
90 (120)
100 (109)
90 (99)
95 (104)
86 (95)
90 (99)
81
85 (94)
78
110 (150)
100 (109)
91 (100)
95 (104)
87 (96)
91 (100)
83
86 (95)
79
150 (200)
101 (110)
92 (101)
96 (105)
88 (97)
91 (100)
83
86 (95)
79
