Report. Laboratory for Acoustics Determination of the insertion loss or sound power insulation of Arma-Chek Sound Insulation

Transcription

1 Report Member ONRI ISO-9001: 2000 certified Laboratory for Acoustics Determination of the insertion loss or sound power insulation of Arma-Chek Sound Insulation Report number A E dd. 4 February 2005 Peutz bv Paletsingel 2, Postbus AR Zoetermeer Tel. (079) Fax (079) info@zoetermeer.peutz.nl Peutz bv Lindenlaan 41, Molenhoek Postbus 66, 6585 ZH Mook Tel. (024) Fax (024) info@mook.peutz.nl Principal: Armacell UK Ltd Mars Street Oldham OL9 6LY United Kingdom Report number: A E Date: 4 February 2005 Peutz GmbH Kolberger Strasse Düsseldorf Tel Fax dus@peutz.de Peutz S.A.R.L. 34 Rue de Paradis Paris Tel Fax peutz@club-internet.fr Peutz bv PO Box London W5 2ZA Tel Fax peutz.london@tiscali.co.uk Ref.: TS/YW/LvI/A E-RA All orders are accepted, carried out and charged in accordance with the 'Regeling van de verhouding tussen opdrachtgever en adviserend ingenieursbureau' (Regulations governing relations between clients and consulting engineers), RVOI KvK: BTW: NL B01.

2 Index page 1. INTRODUCTION 3 2. NORMS AND GUIDELINES 4 3. TESTED CONSTRUCTION 5 4. MEASUREMENTS Method Accuracy Restrictions due to the measurement set-up Classification according to table 1 of ISO Environmental conditions during the tests Results 8 A E-RA 2

3 1. INTRODUCTION At the request of ARMACELL UK Ltd sound insulation measurements (insertion loss, sound power insulation) have been carried out on Arma-Chek Sound Insulation in the Laboratory for Acoustics of Peutz bv, at Mook, The Netherlands (see figure 1) A E-RA 3

4 2. NORMS AND GUIDELINES The measurements have been carried out according to the Quality Manual of the Laboratory for Acoustics and to: ISO 15665:2003 Acoustics - Acoustic insulation for pipes, valves and flanges which norm refers to: ISO 3741:1999 NOTE: Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for reverberation rooms this international standard has been accepted within all EUcountries as European Norm EN ISO 3741:1999 A E-RA 4

5 3. TESTED CONSTRUCTION The description of the various constructions was taken from the data supplied by the principal. The masses have been checked by the staff of the laboratory. Several types of materials are combined in the variants tested. These materials are: Armafoam Sound 240 (called AFS in this report) 25 mm thick, with a density of 254 kg/m 3 (weighted) Class 0 (called CO in this report) 25 mm thick, with a density of 58 kg/m 3 (weighted) Arma-Chek R (called 2R in this report), 2.1 mm thick (measured); with a density of 1655 kg/m 3 (weighted) Armafoam barrier 10 kg/m 2 (called AFB10 in this report), 4.5 mm thick (measured); with a density of 2313 kg/m 3 (weighted) The materials have been put with no tension around the pipe and around each other. The joints between the AFS and CO have been glued together with no overlap, using Armaflex adhesive type 520. The joints between the 2R and the AFB10 have been glued together with an overlap, using Armaflex adhesive type 520. The layers of Arma-Chek R have been applied using a small overlap, the same adhesive has been used. Thickness ca. 106 mm total mass ca kg/m 2. The different materials have been applied to the test pipe in the following order : 1 x CO 2 x AFS 1 x AFB10 1 x CO 1 x 2R The results as presented here relate only to the tested items and laboratory conditions as described in this report. The laboratory can make no judgement about the representativity of the tested samples. A E-RA 5

6 4. MEASUREMENTS 4.1. Method The tests were conducted in accordance with the provisions of the test method ISO in the Laboratory for Acoustics of Peutz bv in Mook. A detailed description of the test set up has been given in the figure 2 of this report. A steel pipe (323 mm outer diameter; wall thickness 6.3 mm) is installed crossing the reverberation room, both ends of the pipe penetrating through the walls of the room. The penetrations have been sealed adequately. Noise is introduced in this pipe using a loudspeaker mounted in one end. The opposite end of the pipe is terminated by means of a closed anechoic termination. A microphone on a rotating boom is used in the reverberation room in order to measure the noise radiated from the pipe before and after insulation is applied to the pipe. A microphone is mounted inside the pipe in order to control the consistency of the noise source before and after insulation is applied to the pipe. The reverberation time of the room is also determined before and after insulation is applied to the pipe. From each set of measurements (sound pressure level and reverberation time) the sound power level L W radiated into the reverberation room is calculated according to ISO The reverberation room of Peutz has been accredited for this kind of measurements. The insertion loss D W caused by the cladding is now calculated as D W = L W,b - L W,c where: L W,b = the sound power level with the bare pipe L W,c = the sound power level with the cladded pipe 1 For this type of measurements the Laboratory for Acoustics has been accredited by the Dutch Council for Accreditation (RvA) as a test laboratory, registration number L334. A E-RA 6

7 4.2. Accuracy This norm relates to ISO 3741 and in there the next estimations regarding accuracy are mentioned: (reproduction of the table 1 of the ISO 3741) Table 1 Estimated upper values of the standard deviations of reproducibility 1 of sound power levels determined in accordance ISO 3741:1999 Band width midband frequencies [Hz] upper values of standard deviation of reproducibility [db] 1/3 octave 100 a to to to to /1 octave 125 a to A-weighted per Annex E 0.5 b a Recommendations for frequencies below 100 Hz: are given in Annex C b Applicable to a source which emits noise with a relatively flat spectrum in the frequency range 100 Hz to Hz 4.3. Restrictions due to the measurement set-up In the set-up as used the maximum measurable insertion loss is determined by the difference between (1): the sound pressure level in the reverberation room of the bare pipe and (2): the back-ground sound pressure level. This difference is determined and shown as the maximum measurable insertion loss in table 2 below. Table 2: maximum measurable insertion loss limited by the measurement set-up used octave band centre frequency, Hz D w Reproducibility R: when two tests are performed on identical test materials - in different laboratories - by different person(s) - under different environmental conditions - the probability will be 95% that the difference between the two test results will be less than or equal to R A E-RA 7

8 4.4. Classification according to table 1 of ISO In ISO a classification system is given in order to give a simple way to classify the material under test. It has to be mentioned that before comparison the octave-band insertion loss values have to be rounded to the nearest 0.5 db The table 1 of ISO is reproduced here partly, it is simplified for the nominal diameter of the used pipe (310.4 mm inner diameter, 323 mm outer diameter): Table 3: minimum insertion loss required for each class for a pipe diameter 300 D 650 mm octave band centre frequency, Hz Class minimum insertion loss A B C Environmental conditions during the tests Table 4: Environmental conditions during test room barometric pressure [kpa] Temperature [ C] relative humidity [%] Results The results of the measurements are given in the table 5 and in figure 3. A E-RA 8

9 Table 5: Measurement results VARIANT figure nr. frequency [Hz] INSERTION LOSS [db] values in () rounded to the nearest 0.5 db (see 4.4) 2 1/3 oct /1 oct (-2.5) (5.5) (17.5) (37.0) (54.5) (49.5) class (see 4.4) C (45.5) Measurements and calculations are made in 1/3 octave bands form 100 to Hz. From the final results the octave-band insertion loss has been calculated from 125 to 8000 Hz. From the rounded octave-band values the Class has been determined and stated. Mook, Th. Scheers Leader of the Laboratory ir. M.L.S Vercammen manager This report contains: 9 pages and 3 figures A E-RA 9

10 LABORATORY FOR ACOUSTICS PEUTZ bv Lindenlaan 41, NL-6584 AC MOLENHOEK (LB), THE NETHERLANDS Story OVERVIEW air supply silencer plenum silencer (E) (8) floor measurement of the reduction of transmitted impact noise (9) waste water level mm Ground level opening (A) (closed) w x h = 1.30 x 1.80 m plenum air supply installations (6) (5) (4) (A) reverberation room (B) (3) (C) (D) receiving room (2) sending room (1) sanitairy installations (7) suspended ceilings or raised floors workshop heating wc shower conference room analyses overhead door TEST OPENINGS (w x h in mm) (B) 1000 x 2200 (C) 1500 x 1250 (D) 4300 x 2800 (E) 4000 x m scale A E-RA figure 1

11 LABORATORY FOR ACOUSTICS Measurement set-up 8090 mm 5560 mm 0 X 0 Y anechoic termination 1 (A) pipe with insulation under test microphone sound source 5 (B) 6 7m revereration room (3) termination loudspeaker bare pipe in reverberation room A E-RA figure 2

12 LABORATORY FOR ACOUSTICS MEASUREMENT OF THE INSERTION LOSS DW ACCORDING TO ISO 15665:2003 principal: ARMACELL UK Ltd R; 2 mm CO; 25 mm AFB10; 4 mm AFS; 25 mm AFS; 25 mm CO; 25 mm STEEL; 10 mm db measured at: laboratory conditions signal: broad-band noise bandwidth: 1/3 octave 50 ISO 15665:2003 Class C2 40 insertion loss DW Insulat rel , mode 4 file: a1395 ##:292 1/3 oct. 1/1 oct k 2k 4k 8k Hz frequency /3 oct db /1 oct db publication is permitted for the entire page only Mook, A E-RA figure 3