All about vacuum insulated piping (VIP) and vacuum technology
It’s all about Cryogenius.
In cryogenics, insulation is crucial. And while there are an enormous number and different insulation methods available, Demaco uses vacuum or high-vacuum technology.
Why vacuum technology?
In various industries, liquid gas is used as a refrigerant, fuel, or an element for scientific experiments. To maintain their liquid form, liquid gases must be stored, transported, and used at very low temperatures. This temperature varies from one gas to another. For example, oxygen requires a temperature of -183 centigrade, while helium only liquefies at -267.9 centigrade. When a gas heats up too much, it will dissipate in the form of boil-off gas (BOG).
Maintaining the perfect temperature of liquid gases is an immense challenge. Before gas is ready for use, it must first be produced, stored, and transported. In most cases, this entails moving through storage areas (terminals), transfer lines, and transport vehicles, all of which must be designed to minimize heat affecting the gases throughout the entire process.
One method that proved very successful for blocking heat during this logistical process is vacuum technology. This method insulates 15 times more effective than other insulation materials (PIR/PUR, or Foamglas, Armaflex, Perlite, and Misselon); we can apply vacuum technology to the piping as well as terminals and stand-alone cryogenic products.
What is vacuum technology, and how exactly does it work?
Vacuum technology is the use of vacuum or high-vacuum for optimum insulation of transfer lines or systems. A thin vacuum environment is created inside the pipe or system by constructing these with a double wall and extracting all the air between these walls. The result is a pressure difference between the vacuum environment with the outside air, which keeps a large part of the surrounding heat out of the system or the pipe.
Just exactly how does this work? Why does vacuum insulate so well, and what other techniques do we use in our vacuum insulated pipes?
Physical materials, and therefore liquid gases, are heated in three different ways:
- Through conduction: in essence, thermal conduction through direct contact. When two objects come into contact, heat generally transfers directly from the hotter to the colder object. This also applies to liquid gases.
- By convection: This is heat created by the movement of molecules. The more vigorous molecules are in motion and impact each other, the more heat is produced.
- By radiation: radiant heat can include the radiation from the sun or any other object emitting heat.
Interested in one of our other vacuum products?
Expert in vacuum technology
Demaco decided to focus on vacuum technology back in 1989; Demaco and the technology itself have experienced massive growth.
In 1989 the field of cryogenics was still relatively new, which allowed Demaco to experience all developments within this cutting-edge field.
By cooperating with renowned technical universities, we have now gained endless experience and can genuinely call ourselves experts in the field of vacuum technology.
Want to know more about our vacuum insulated piping? Then check out our product page, vacuum-insulated piping, for more information.
Vacuum technology’s unique feature is the fact that it significantly counters convection. It stops the movement of molecules in the air around the cooled substance, preventing heat from being generated here.
Combining this method with additional techniques that also counteract radiation and conduction, creates insulation that blocks virtually all incoming heat.
Demaco’s VIP technology is designed to provide maximum insulation by combining vacuum technology with a multi-layer combination of aluminum foil and glass paper. The aluminum foil blocks radiation and the glass paper provides some space between the different layers of foil. This also counters conduction.