Roxul Industrial Insulation Process - Manual (Page 17)

1.1 Planning and preparation
A. Functional requirements
b) Operation of the installation
To select a suitable insulation system, the
operating method of the installation must be
considered. A basic distinction is made between
continuous and interrupted operation. With
continuous operation, the operating temperatures
are constantly above or constantly below the
ambient temperatures. The interrupted operating
method, also referred to as intermittent or batch
operation, is characterized by the fact that the
installation is switched off between each
operating phase and during that time can assume
ambient temperatures. For special applications,
e.g. dual temperature systems, the operating
temperature alternates above or below the
ambient temperature.
c) Operating temperature
The appropriate insulation material should be
resistant to the intended operating/peak
temperatures. This product property is assessed
by the maximum service temperature (also see
Chapter 2.2 “Product properties & test methods”).
d) Permissible heat losses or temperature
changes of the medium
With many technical processes, it is essential that
media in vessels, columns or tanks do not fall
below a specific lower temperature limit,
otherwise chemical processes will not proceed as
intended or the media will set and can no longer
be pumped or extracted. Over-cooling can lead to
the precipitation of, for example, sulphuric acid in
exhaust and flue gas streams, which promotes
corrosion in the pipes or channels.
With flowing media, it is essential to ensure that
the temperature of the medium is still at the
desired level at the end of the pipe. The thermal
insulation is designed according to these
requirements. Under extreme conditions (e.g.
lengthy periods of storage, long transport routes
or extreme temperatures), installing tracing may
be necessary, to ensure that the media is kept
within the required temperature limits.
Thermo-technical engineering calculation
programs like NAIMA's 3E Plus
® or ROXUL's
"ROCKASSIST" (coming soon) can aid in ensuring
the optimum engineering and design of
these insulation systems. More information can be
found on our website
www.roxul.com . For special
situations please contact the ROXUL ® Technical
Services Team for further guidance.
Inside buildings, uninsulated or poorly insulated
parts of installations unnecessarily increase room
temperatures, which can have a negative effect on
the working environment - both for the people
who work long hours under these conditions and
for the electronic components. In addition to the
increased heat loss, the need for climate
controlled rooms requires further energy
consumption. The design of the insulation and the
related reductions in terms of heat loss from
parts of installations should be relevant to the
entire infrastructure and use of the building.
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