Abstract： ASME PTC 36:2018 pdf download.Measurement of Industrial Noise. 3-1 CHOICE OF METHODS Procodures dcscnbed in ANSI/ASA S1.13 and ANSI/ASA S12.18 shall be used to measure airborne sound pressure levels in a near field or far field under any co...

ASME PTC 36:2018 pdf download.Measurement of Industrial Noise.

3-1 CHOICE OF METHODS

Procodures dcscnbed in ANSI/ASA S1.13 and ANSI/ASA S12.18 shall be used to measure airborne sound pressure levels in a near field

or far field under any conditions, ANSI/ASA S1.13 Is primarily for Indoor sound measurements, although it can be used outdoors, and ANSI/ASA S12.1H applies only to outdoorenvironments. lithe soond-power level of outdoor sources must be characterized, the methods of other recognized standards may be used.

3-2 CONFIGURATIONS

(a) Components to Be Tested. Equipment being tested consist ofa single component oran entire set olcomponents that indude all or

part of an industrial facility. The equipment may be located indoors or outdoors and may include the enclosure building(s) as a

source of noise. This Code utilizes, by reference, existing standards and provides additional informational guidance in the

application of those methodologies (see Nonmandatory Appendix B).

(b) Equipment Configuration. A wide range of potential equipment configurations are allowed for indoor and outdoor noise sources.

For those situations In which the receiver sound leveLs of indoor equipment is the objective, corrections shall be made for the

reverberation effects of building surfaces (wall, floor, or ceiling).

3-3 TEST UNCERTAINTY

Tables 3-3-1 and 3-3-2 provide approximate limits for test data correction and the estimated amount of corresponding uncertainty

forvarious grades olmeasurement accuracy. Table 3-3-1 definesthe grade ofaccuracyavailable to the userof ASME PTC 36 based on the

magnitude of the corrections. For example, a test for which the background noise correction exceeds 1.3 dli or the environmental

correction exceeds 2dB cannot be considered an engineering grade test. Therefore, the uncertainty of the test data degrades to

survey grade (orspecial case), which results in a greaterdegree of uncertainty. Table 3•3•2 shows the estimated uncertainty

associated with engineering grade and survey grade test results, expressed as the 95% confidence interval or 2 tImes the standard

deviation. Both tables come from ISO 10494. Table 3•3•2 Is slightly modified. If test result corrections exceed the allowable range for engineering grade or survey grade accuracy, the uncertainty wdl be greater than that shown in Table 33-2 and will require

evaluation un a case’by’case basis.

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