Roxul Industrial Insulation Process - Manual (Page 27)

1.2 Insulation of piping
Hot insulation systems
Principally, a thermal insulation structure for
piping consists of an appropriate insulating
material, usually covered by sheet metal cladding.
This protects the object and the insulation from
external influences such as the weather and
mechanical loads. Spacers are also essential with
insulation such as wired mats, which do not offer
sufficient resistance to pressure to hold the
weight of the cladding and other external loads.
These spacers transfer the cladding loads directly
onto the object. In the case of vertical piping,
support structures are fitted to take on the loads
of the insulation and the cladding. In general,
support structures and spacers form thermal
bridges.
Selecting a suitable insulation system depends on
numerous parameters. These are described in
greater detail in Chapter 1.1. Regarding the
different forms of pipe insulation, a fundamental
distinction can be drawn between the following
insulation systems.
Insulation with pipe sections
Generally, the best insulation is achieved using
ProRox
® Pipe Sections and can be used up to
temperatures of 1400 °F (760 °C) when using
ProRox
® PS 980 NA Type V insulation. They are
supplied ready split and hinged for quick and easy
snap-on assembly and are suitable for thermal
and acoustical insulation of industrial pipe work.
Due to their excellent fit and high compression
resistance, pipe sections can often be applied in
a single layer without any additional spacers.
If multiple layers are required, ROXUL
® can also
supply double layered - ‘nested’ - pipe sections.
This reduces installation costs considerably. Also
the number of thermal bridges, which have a
negative influence on the insulation, is greatly
reduced, while a lower thickness may be applied
compared to wired mats.
Using pipe sections for the insulation of pipes
results in considerably reduced installation time
and costs. The lack of spacers and “unforeseen”
gaps minimizes heat losses and the risk of
personal injuries due to hot spots on the cladding.
At temperatures above 550 °F (300 °C), the
provisional application of spacers must be
determined in each individual case.
Pipe sections are always precisely tailored to the
corresponding pipe diameter to minimize the risk
of convection and processing defects. ROXUL pipe
sections are available in diameters of
NPS 1/2" (23 mm) to NPS 28" (713 mm).
Insulation with load-bearing pipe wraps
(mats)
Load-bearing pipe wraps (mats), such as
ENERWRAP
® MA 960 NA are the latest development
in the insulation sector. ENERWRAP ® MA 960 NA is
a stone wool (mineral wool) insulation wrap
available with a black mat or reinforced foil facing
and is designed for easy installation of large
diameter pipes. Typical applications include:
pipe diameters >NPS 12" (326 mm), or;
piping with a high number of shaped pieces
such as elbows or T-joints.
ENERWRAP ® MA 960 NA can be applied up to
temperatures of 1200 °F (650 °C). It is highly
compression resistant and can be applied without
any additional spacers.
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