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HomeMy WebLinkAboutSubmittal LetterDISTRIBUTOR l 47 LIGH cORPQRATION June 14, 2006 SeaView Research 3898 NW 7th St Miami, FL 33126 Ref: Noise abatement Mr. Bruce Wilner: R B GROVE, INC, 1881 NW 93 AVE DORAL, FL 33172 305-477-0277 SON17:7";'!TO THE PUBLIC RECORD FOR ITEM.z-ON (cia')a• OVERVIEW Two diesel generators (300kw & 70kw) located at 3898 NW 7th Street. These units are located on the south side of the property situated between the owners building (4-story) and a perimeter wall approximately 6' in height. Behind this wall are residential homes. Sound pressure levels for this design product are approximately 90 dba. OBJECTIVE To reduce the sound pressure levels on the existing products. EXHAUST noise may be reduced by upgrading the current industrial grade silencers to hospital grade silencers yielding an insertion loss of 32-45 dba • Industrial grade silencers — insertion Toss (in versus out) 12-18 dba*. • Residential grade silencers — insertion loss 18-25 dba*. • Critical grade silencers — insertion loss 25-32 dba*. • Hospital grade silencers — insertion loss 32-45 dba* ENGINE RADIATED NOISE Both sets do not have foam insulation on the inside of the steel enclosures. The addition of 1.5" of foam can reduce the sound pressure levels by approximately 5 decibels. The enclosures for both units present there own unique situations. • 300kW — this set is suitable for foam installation. Most side panels are suitable with one exception; the air intake for the generator set is located on the left side (facing the owners building). • 70kW — this enclosure is not suitable for foam installation as there are numerous openings on all sides of the enclosure. While foam is not suitable, we believe the major producer of noise to be the larger set. GENERATORS FOR INDUSTRIAL COMMERCIAL & RESIDENTIAL TO 2.8MW DEPENDABLE POWER SOLUTIONS a LIGHT .,‘;:sag„kor CORPORATION PROPOSAL Step 1: Install "Hospital" grade exhaust silencers on both units. Install 1.5" sound attenuating foam in the 300 kW enclosure. DISTRIBUTOR R B GROVE, INC. 1881 NW 93 AVE DORAL, FL 33172 305-477-0277 We would also recommend placing a landscape barrier to the East of the 300kw unit The above proposal, within the constraints of the enclosure designs, should bring these sets from the industrial grade close or equal to the residential grade. Approximate completion approximately 30-45 days. Tom Piper R. B. Grove, Inc. * Source; Nelson Industries ** Due to the influencing factors of the site (buildings and wall) these results can not be specifically calculated and are approximate. Submitted Into the public record in connection with item P2.1 t, on c'' yyl o i# Priscilla A. Thompson City Clerk GENERATORS FOR INDUSTRIAL COMMERCIAL & RESIDENTIAL TO 2.8MW DEPENDABLE POWER SOLUTIONS