Roxul Industrial Insulation Process - Manual (Page 70)

1. System solutions
Insulation of boil
er
s
1.6 Insulation of boilers
Hot water boilers and boilers for the production of
water vapor under high pressures are considered
to be steam boilers. As a generic term, boiler is
used to denote steam generators and hot water
installations. Insulating boilers has the following
purposes:
Reduces heat loss and increases the efficiency
of the boiler
Aids protection against contact by minimizing
the surface temperature
Prevents heating of the compartment air in the
boiler house, which guarantees an acceptable
working
The design and functionality of the boilers on the
market is so varied that the examples of use
cannot fully take into account the particular
circumstances of each case. Determine whether
the products and construction described are
suitable for the corresponding application in
each individual case. In if doubt, consult the
ROXUL
® Technical Services Team.
The applicable standards and regulations must
also be observed. A few examples follow:
ASTM C1696 "Standard Guide for Industrial
Insulation Systems"
NACE SP0198 (Control of corrosion under
thermal insulation and fireproofing materials -
a system approach)
ASME "Boiler and Pressure Vessel Code"
MICA "National Commercial & Industrial
Insulation Standards"
DIN 4140 (Insulation works on industrial plants
and building services installations)
AGI Q101 (Insulation works on power plant
components)
CINI-Manual: “Insulation in industry”
BS 5970 (Code of practice for thermal insulation
of pipe work, equipment and other industrial
installations)
PIP (Process Industry Practices)
1.6.1 Insulation of fire tube boilers
Fire tube boilers are often used in small and
medium-sized industrial plants, where small and
medium-sized mixtures of hot water or water
vapor are required at low pressures. These boilers
are used in the mechanical building appliances of
large complexes, such as hotels, hospitals etc.
The fire tube boiler consists of a horizontally
positioned cylindrical casing body with diameters
of up to four meters. The interior generally
contains a corrugated flame tube, where a fuel,
usually oil or gas, is burnt. At the end of the boiler
are so called reversing chambers, where the flue
gas is reversed and pumped back through the
boiler. Depending on the design, the boiler will
have one or more gas flues, connected at the rear
or the front base through the reversing chamber.
The chamber surrounding the gas flues and the
fire-tube is filled with the water to be heated.
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