Flowserve FRBH Manual do Utilizador descarregar pdf (Página 10)

FRBH, FRBHX AND FRBHS USER INSTRUCTIONS ENGLISH 71569178 10-04

Page 10 of 54

1.8 Specific machine performance

For performance parameters see section 1.5, Duty

conditions. When the contract requirement specifies

these to be incorporated into User Instructions these

are included here. Where performance data has been

supplied separately to the purchaser these should be

obtained and retained with these User Instructions if

required.

1.9 Noise level

When pump noise level exceeds 85 dBA attention must

be given to prevailing Health and Safety Legislation, to

limit the exposure of plant operating personnel to the

noise. The usual approach is to control 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

machines above a certain power level will exceed 85

dBA. In such situations consideration must be given to

the fitting of an acoustic enclosure to meet local

regulations.

Pump noise level is dependent on a number of factors -

the type of motor fitted, the operating capacity,

pipework design and acoustic characteristics of the

building. The levels specified in the table below are

estimated and not guaranteed.

The dBA values are based on the noisiest ungeared

electric motors that are likely to be encountered. They

are Sound Pressure levels at 1 m (3.3 ft) from the

directly driven pump, for "free field over a reflecting

plane". For estimating L

sound power level (re 1 pW)

add 14dBA to the sound pressure value.

If a pump unit 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.

& For units driven by equipment other than

electric motors or units contained within enclosures,

see the accompanying information sheets and

manuals.

FRBH pump size

Sound Pressure dBA

(at 1 m (3 ft) reference 20 µPa)

Pump speed

rpm

Sound Power

Level dBA

2 FRBH-121 75 1780 89

3 FRBH-121 75 1780 89

3 FRBH-101 75 1780 89

3 FRBH-141 77 1780 91

4 FRBH-111 77 1780 91

4 FRBH-141 78 1780 91

6 FRBH-111 80 1780 94

6 FRBH-142 81 1780 95

8 FRBH-182 83 1780 98

8 FRBH-152 85 1780 100

10 FRBH-182 85 1180 100

12 FRBH-233 85 1180 100

18 FRBH-274 87 885 102

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 53 54

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