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Beregning av PA/GA* anlegg

til offshore installasjoner

Jens Holger Rindel

Multiconsult

*) PA/GA – Public Address & General Alarm

NAS Høstmøte 2012

Stavanger

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Innhold

Grenseverdier

Beregningsmetode

Bakgrunnsstøy

Høyttalerdata

Modellering, SketchUp -> ODEON

Mottager-område

Resultater, SPL og STI

Beregning av støynivåer

Konklusjon

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Grenseverdier for PA/GA

IEC 60849 Sound systems for emergency purposes

– C.2 Audibility of attention drawing signals

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Grenseverdier for PA/GA

NORSOK T-100 Telecom subsystems

– 5.3.2 Alarm tone signals

– 5.3.6 Audio coverage with the system in normal operation

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Beregningsmetode

IEC 60268-16 Sound system equipment – Part 16:

Objective rating of speech intelligibility by speech

transmission index

– Metoden er implementert i ODEON

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Baggrundsstøy

Eksempel:

85 dBA

Lyserød støy

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Høyttaler eksempel: DNH – DSP-15 EExmN

(T)

Overall Gain =

10 log (3) = 4,8 dB

SPL 3 W/10 m =

105 +4,8 – 20 =

89,8 dB

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Høyttaler data i ODEON

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Direktivitet – Eksempel: 1 kHz

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GEAD - Golden Eagle Area Development, UK

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GEAD – SRP – Sulphate removal package

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GEAD – SRP – Sulphate removal package

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GEAD – SRP – Sulphate removal package

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GEAD – SRP – Sulphate removal package

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Mottaker-grid. Høyde 1,50 m. Avstand 0,50 m

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SPL og STI level 5 – System A + B

SPL(50%) = 105,8 dB

Pct. Area with

SPL < 91 dB: 0 %

SPL > 105 dB: 77 %

SPL > 115 dB: 0 %

STI(50%) = 0,50

STI(95%) = 0,45

Pct. Area with

STI < 0,35: 0 %

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SPL og STI level 5 – System A

SPL(50%) = 102,1 dB

Pct. Area with

SPL < 91 dB: 0 %

SPL > 105 dB: 14,5 %

SPL > 115 dB: 0 %

STI(50%) = 0,45

STI(95%) = 0,39

Pct. Area with

STI < 0,35: 0,9 %

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SPL og STI level 5 – System B

SPL(50%) = 103,0 dB

Pct. Area with

SPL < 91 dB: 0 %

SPL > 105 dB: 7,2 %

SPL > 115 dB: 0 %

STI(50%) = 0,45

STI(95%) = 0,41

Pct. Area with

STI < 0,35: 0 %

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Støyberegninger- Grid 0,1 m

Eksempler før/etter demping av støykilder

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Equipment noise data

Tag number Equipment # Units / Normal

operation

Lp (dBA) 1m Lw (dBA)

(each unit)

P-4203A/B SRP Booster Pumps 2 / 1 83 104

P-4209A/B CIP UF Pumps 2 / 1 77 92

P-4210 CIP SR Pump 1 / 0 77 92

B-4230A/B Air Blowers 2 / 1 80 98

P-5229A/B Hypochlorite Dosing Pumps 2 / 1 60 71

F-4205A/B Sulphate Removal Unit 2 / -* - -

FV-41044

A/B/C/D/E/F/G Control Valve 7 / 7 70 81

FV-42171A/B Control Valve 2 / 2 70 81

PV-42096A/B Control Valve 2 / 2 70 81

PV-42168A/B Control Valve 2 / 0 68 79

FV-42095A/B Control Valve 2 / 2 70 81

FCV-42163 Control Valve 1 / 0 70 81

SRP Total Sound Power Level Normal operation - 107

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Level 4 – A old

Max SPL no closer than 1 m from equipment: 87.4 dB(A)

Max SPL : 87.6 dB(A)

Pct. Area with SPL above 83 dB(A) and no closer than 1 m: 17.3%

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Level 4 - A

Max SPL no closer than 1 m from equipment: 86.3 dB(A)

Max SPL : 86.3 dB(A)

Pct. Area with SPL above 83 dB(A) and no closer than 1 m: 1.1%

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Level 5 – A old

Max SPL no closer than 1 m from equipment: 88.3 dB(A)

Max SPL : 93.2 dB(A)

Pct. Area with SPL above 83 dB(A) and no closer than 1 m: 15.7%

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Level 5 – A

Max SPL no closer than 1 m from equipment: 84.1 dB(A)

Max SPL : 90.7 dB(A)

Pct. Area with SPL above 83 dB(A) and no closer than 1 m: 2.0%

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Konklusion

Romakustisk beregningsprogram ODEON anvendes

både til PAGA beregninger og til støy beregninger

Grid response anvendes til at finne min. middel max.

verdier (5%, 50%, 95% percentiler) for SPL og STI

Kan også anvendes til at finne pct. areal, hvor

grenseverdier blir overskredet

Grid response med tilpasset fargeskala gir en fin

oversikt over resultater

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