Page 26 - Apollo - Industrial Applications Guide

INTRODUCTION:

Ethylene and Propylene based glycol heat transfer fluids are often used for the
purpose of controlling temperatures. They can be used to help put heat into or TYPES:
to help take heat out of something. Oils are generally utilized just to put heat
into something. Cooling is generally desirable for the purpose of extending Dow Therm®
equipment life or in the case of a process, to start changing the state of being Thermanol 66®
at a given point. Heating is often done to help keep normally viscous materials Slytherm®
flowing, to prevent solidification and/or freezing.
Thermalstar®
Thermalcool®
CHARACTERISTICS:

Primary characteristic of thermal fluids and hot oils are that they are non-
compressible and work to move heat in a desired direction. By the use of MARKETS:
piping, jacketing and heat exchangers, heat is able to be added to or taken
out of equipment and/or processes. So by adjoining a piece of equipment or Chemical Industry
a piping system with a vessel of circulating thermal fluids and by controlling Manufacturing facilities
their (thermal fluids) temperatures, it allows you to modify and control the Refineries
temperature of the piece of equipment or the media flowing through the Mining
piping system. Food and Beverage

GENERAL NOTE: When utilizing thermal fluids in a piping system it is often necessary that the
valves be vented. It is also important to allow room for expansion to take place in the piping MATERIALS:
system and/or storage vessel by means of sufficient room for growth or expansion. This can
be done by venting the valve and then by use of safety relief devices, expansion devices, or
having room for expansion back into the source of the supply. Care must be given not to Carbon Steel is the most common
utilize check valves in this part of the system. Refer to Vented Valves – Bodies, Balls Top & Side material for handling the thermal
section of this literature for better understanding of the requirement. fluids, but as you get to cold
temperatures that can change
to stainless steel. Also as the
atmosphere becomes more
corrosive or as a process dictates
the main containment vessel to
be of a noble alloy, many times
the material for the external vessel
or jacket will follow. This is more
likely if the two components
need to be welded together. The
seats in the valve are commonly
PTFE based materials at lower
temperatures and carbon graphite
at higher temperatures. The seals
are occasionally PTFE based but
they are more frequently than not
flexible graphite or Grafoil®. It is
always good to check compatibility/
acceptability of selected materials
based off specific application data
like concentrations, temperatures
and pressures

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