By magaly basler. fire pits design. Published at Saturday, November 11th, 2017 - 07:12:34 AM.
OXYGEN: Although there are other chemicals that can combine with fuels to produce heat, oxygen is the most common. The need for oxygen to sustain a fire in all fire pits is shown by the fact that fuels heated in a vacuum will not burn. Sorry there will be no outdoor fire pits in space! CHEMICAL REACTION: There are certain conditions under which fuels will not produce a flame, even though fuel, heat and oxygen are present. For example, if the percentage of natural gas in air is not between about 4 percent and 15 percent, no flame will be produced; your fire pit will not go!
Whether fire is our friend or foe depends a lot on the way we treat it and our having a basic knowledge of its causes. This understanding will help us see the practicality and benefits of having a Fire Pit. What Is Fire? Although men had been using fire for thousands of years, its true nature was not known until experiments by Antoine Lavoisier and others in the 1700’s showed that fire marks a chemical reaction involving oxygen. I am sure that if they had put outdoor fire pits to good use, they could have figured this out way earlier! Anyway, they proved that oxygen is actually added during the burning process, although others before that had thought that fire resulted from the release of an imaginary substance called phlogiston. Fire is defined as the heat and light that come from burning substances - essential of course for every fire pit.
For wood burning fire pits always use a safety screen. They come in various shapes and sizes and will help contain sparks and flying embers. Some models are sold with them, however if you are building fire pit make sure you incorporate a screen into the design. Materials used in fire pits should be carefully considered. Porous stone, non treated river rocks and even cinder blocks should not be used inside a fire pit. When placed near intense heat, they can explode. Standard building bricks will eventually crack and need replacing over time. In order to prevent this fire pits should be lined with fire rated materials such as firebricks or thick steel rings. Use fire rated mortar. Adhesives are not advised as when heated they can give off unhealthy fumes.
Simple and inexpensive wood burning fire pits can be built in the ground using the now classic method found in campsites and parks today. It’s as easy as 123.1-Dig a hole in the ground. 2-Add gravel and sand for drainage and and to provide a level base. 3-Line it with a metal ring to help contain the flames and focus the heat. Some local authorities only allow fire pit’s that are raised up off the ground, so please check first!! Root fires are a concern so don’t forgo the gravel and sand layer. Some local authorities insist on a base of 25cm if the fire pit is not sitting directly upon a rock outcrop! If you have decided to burn gas then you can either run gas lines to the fire pit or incorporate a propane tank into the design, preferably concealed. We strongly suggest using a certified technician when connecting natural gas or propane to any fire feature. Gas fire pit kits come in all shapes and sizes. You can buy burner kit to incorporate into your design or an entire structure that comes ready for you to apply your finish of choice.
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