Date: Thu, 9 Jan 1997 09:50:20 -0800 (PST)
From: John Stults <jts@gene.COM>
Message-Id: <199701091750.JAA12596@ruby.gene.com>
Subject: Reducing Noise
To: Recipients of ABRF List <abrf@aecom.yu.edu>
We also have a chronic noise problem (13 mechanical vac. pumps in a single lab,
plus assorted compressors, turbo pumps, etc). Acoustical tile on the ceiling
and fabric-covered, sound-absorbing panels on all the walls have brought
the noise to a "safe" level, according to our health and safety office.
We do not have carpet, but I've been in other labs in which carpeting
makes a significant difference.
The noise from a large compressor and two mechanical vacuum pumps for our
FT-MS is reduced significantly by a simple "box" cover: an aluminum frame
with aluminum sheet-metal sides, lined with ~2-inch dimpled foam. The
bottom is completely open so it can be lifted off easily for service.
Notches are cut in the bottom edge, where needed, for hoses, wires, etc.
A cooling (muffin) fan maintains an acceptable temperature. It was supplied
by IonSpec.
Whenever possible, moving the noisy components outide the lab is the
preferred solution. If the electrical lines are isolated and appropriate
shielding is done, this has the added advantage of reduced electronic noise.
John Stults
Genentech, Inc.
415-225-1203