Hot
Insulation Materials
Removable insulation
is specifically designed to insulate piping systems transporting gas and
substances at high temperatures. The materials used to construct the insulation
work to prevent your pipes from overheating, while keeping the warmth inside
the pipe. This helps to cut down on energy bills for your facility, saving you
money in the long run.
So, what materials are
used during circumstances that require hot insulation? Well, that depends on
the intended purpose of the pipe being insulated. There is a laundry list of
materials to choose from all with different purposes. Below are 3 common
materials:
§ Cray Flex:
This material has a high thermal, heat and chemical resistance, while still
produced from high quality raw materials.
§ Resin Bonded Rockwool: Used in both cold and hot insulation, resin bonded rockwool
has high thermal, chemical and heat resistance with an unmatched dimensional
stability.
§ Spiral-wrap Fiberglass: This type of fiberglass is difficult to install, but extremely
inexpensive for your hot insulation needs. It both keeps the contents being
transported at the proper temperature, while ensuring the excess heat remains
within the piping system.
The most important
part about picking a hot insulation material is understanding the maximum
temperature the insulation will be covering. Components less than 350°F can be
covered with off the shelf pre-molded fiberglass. When components are near or
above temperatures of 1000°F, silica or ceramic insulation is usually required.
It is very important to adhere to manufactures suggestions when picking and
installing insulation for hot components.
Cold
Insulation Materials
Just like hot
insulation materials, some of the materials used to produce cold insulation
vary dependent upon the system of pipes they are insulating. Therefore, the
materials used in either hot or cold insulation are dependent on the
customization of the particular piping system. Two common materials used in
cold insulation are:
§ Polyurethane Foam: Perfect for handling low thermal conductivity and
substances with below freezing temperatures. Polyurethane foam also allows for
low smoke emission and low water vapor permeability.
§ Rubber Foam: Rubber
foam is also often recommended for condensation control as the closed cell
technology is highly resistant to moisture vapor.
With chilled
insulation, keeping the cold in is as important as keeping the heat out. There
are many types of insulation used on chilled water pipes. The two most popular
are foam glass and rubber insulation or Armaflex. Although a little more
difficult to work with than pre molded fiberglass, when installed correctly,
these materials do a great job of stopping condensation and preventing energy
loss.
What
Is the Difference?
The difference between
hot and cold insulation materials comes down to a few things. Firstly, the
materials used in hot insulation covers doesn’t require a water vapor barrier
that a cold insulation system needs to properly function. The water vapor
barrier helps prevent metal degradation that can occur overtime.
Buildups of
condensation occur within cold systems, which require bendable or flexible
insulation to deal with this issue. Therefore, the types of metal, fiberglass,
foam and other materials used for thermal bridging in cold insulation are much
more flexible and moldable than those found in hot insulation materials.
Lastly, closed cell
structure is needed in cold insulation to help avoid wicking. The material in
high temperature insulations allows water to enter because the heat will cause
the moisture to evaporate. However, in a cold insulation system the water will
not evaporate. Closed cell structure of the cold insulation material helps
prevent this problem.
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