8 noise level – Flowserve MPT User Manual

Page 10

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MPT USER INSTRUCTIONS ENGLISH 85392699 06-09

Page 10 of 41

®

1.8 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. You may have already specified a
limiting noise level when the equipment was ordered,
however if no noise requirements were defined, then
attention is drawn to the following table to give an
indication of equipment noise level so that you can
take the appropriate action in your plant.

Pump noise level is dependent on a number of
operational factors, flow rate, piping design and
acoustic characteristics of the building, and so the
values given are subject to a 3 dBA tolerance and
cannot be guaranteed.


Similarly the motor noise assumed in the “pump and
motor” noise is that typically expected from standard
and high efficiency motors when on load directly driving
the pump. Note that a motor driven by an inverter may
show an increased noise at some speeds.

If a pump unit only has been purchased for fitting with
your own driver then the “pump only” noise levels in the
table should be combined with the level for the driver
obtained from the supplier. Consult Flowserve or a
noise specialist if assistance is required in combining
the values.

It is recommended that where exposure approaches
the prescribed limit, then site noise measurements
should be made.

The values are in sound pressure level L

pA

at 1 m

(3.3 ft) from the machine, for “free field conditions
over a reflecting plane”.

For estimating sound power level L

WA

(re 1pW) then

add 14 dBA to the sound pressure value.

Typical sound pressure level, dBA, L

pA

at 1 m (3.28 ft) reference 20

µ

Pa (2.9x10

-9

psi)

3550 r/min

2900 r/min

1750 r/min

1450 r/min

Motor size
and speed

kW (hp)

Pump and

motor

dBA

Pump

only

dBA

Pump and

motor

dBA

Pump

only

dBA

Pump and

motor

dBA

Pump

only

dBA

Pump and

motor

dBA

Pump

only

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

77

83

73

76

73

72

71

7.5 (10)

90

78

83

74

77

74

73

72

11 (15)

91

80

84

76

78

76

74

73

15 (20)

92

83

85

79

80

79

76

75

18.5 (25)

92

83

85

79

80

79

76

75

22 (30)

92

83

85

79

81

79

77

75

30 (40)

100

85

93

81

84

80

80

76

37 (50)

100

86

93

82

84

80

80

76

45 (60)

100

87

93

83

84

80

80

76

55 (75)

100

88

95

84

86

81

82

77

75 (100)

100

90

95

86

88

81

83

78

90 (120)

100

90

95

86

90

81

85

78

110 (150)

100

91

95

87

91

83

86

79

150 (200)

101

92

96

88

91

83

86

79

200 (270)

(1)

(1)

(1)

(1)

(1)

83

(1)

80

300 (400)

-

-

-

-

(1)

84

(1)

81

(1)

Motors in this range are generally job specific and noise levels should be calculated based on actual equipment installed.

For 960 r/min reduce 1450 r/min values by 5 dBA.

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