Calcium Silicate is another good insulation for this application. Most
insulators are adept with this product and it's installation, and its
working temp of 1200 'F should be high enough for all exhaust applications.
Additionally the light weight and available hanger supports and shield
assemblies make it more user friendly than rock-wool where you can have "Hot
Hangers".
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Frans Stoop" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, December 16, 2007 2:35 PM
Subject: Re: Exhaust Insulation
Yes, there is good other reason:
NFPA 20 - 2007
par. 11.3.2.1: Ventilation shall be provided for
the following functions:
(1) To control the maximum temperature to
120°F (49°C) at the combustion air cleaner inlet
with engine running at rated load
Uninsulated exhaust(s) and muffler(s) do produce
a lot of heat in the pumproom by radiation and convection.
If the exhausts are well insulated, most of that
heat is discharged outdoors for free (besides the
onetime costs of the insulation).
If the exhausts are not insulated, you will need
more ventilation louvres to get rid of that heat during the summer.
Although the ventilation louvres might close
tight when the engine is shut-down, they are
still a heat leak during the winter.
The larger the louvre area, the more heating you
need during the winter to keep the temperature above 32°F (0°C).
More heating is bad for the owner's wallet and
makes it more difficult for the country to comply
with the Kyoto and Bali protocols.
In tropical and moderate climate we recommend to
insulate the exhaust piping and the mufflers from the engine upto the
outdoors.
Insulation material is usually rockwool in layers
upto 2 or 3 inch (50 - 75 mm) thick, clad with aluminium sheeting.
This is standard technology for insulation
companies as you can find for example in chemical process plants.
Frans Stoop
TOS architecture & fire protection
Netherlands
At 14:49 15-12-2007 +0000, you wrote:
if the exhaust is run at the overhead,
and there is no potential for burns
from that run, then what other guard
would we need, beyond the air gap?
scot deal
excelsior fire engineering
I'm more interested in what everyone else is using. The standard is
very vague: "11.5.3.3 The exhaust pipe shall be covered with high
temperature
insulation or otherwise guarded to protect personnel from injury."
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